Preparation process of benazepril hydrochloride tablets

The invention relates to a preparation process of benazepril hydrochloride tablets which are traditional Chinese and western medicine composited preparations. The benazepril hydrochloride tablets are prepared from the following raw materials: 1 part of benazepril hydrochloride, 35 parts of curcuma aromatic, 35 parts of the root of red-rooted salvia, 35 parts of rhizoma corydalis, 30 parts of semen cassiae, 30 parts of the root of kudzu vine, 30 parts of burdock root, 25 parts of rhodiola rosea, 25 parts of honeysuckle, 25 parts of dandelion, 25 parts of uncaria rhynchophylla, 20 parts of ligusticum wallichii, 20 parts of polygala tenuifolia, 20 parts of eucommia ulmoides, 20 parts of cassia twig, 15 parts of hawthorn, 15 parts of liquorice, 15 parts of semen plantaginis, 10 parts of folium mori, 10 parts of the fruit of Chinese wolfberry, 8 parts of herba lycopi, 8 parts of root of common peony, 5 parts of the root of bidentate achyranthes, and 5 parts of peach kernel. The composition medicine ...

Nutritional type plant health amendment

The invention relates to liquid type plant nutritional amendment capable of effectively improving plant health and prepared by blending and chelating plant amino acid, chitosan and major elements, middle elements, trace elements, beneficial elements and rare earth elements which are essential for plants. The manufacturing technique is simple, the production cost is low, and no harmful gas or sewage water is generated in the production process. The product of the amendment does not contain artificially synthesized hormone, agricultural chemical substances or any microbial preparation, but can effectively provide about ten nutritive elements and beneficial elements required for the growth of the plants and organic nutrition capable of being directly absorbed and utilized by the plants, and can obviously improve the utilization factor of fertilizer, thereby reducing the investment thereof; at the same time, the product can remarkably improve the health condition of the plants, thereby effectively ...

Boracic pinion steel and preparation method thereof

The invention relates to boracic pinion steel and a preparation method thereof. The boracic pinion steel comprises the following component by weight percent: 0.16 to 0.24 percent of C, less than or equal to 0.35 percent of Si, 0.70 to 1.25 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.03 percent of S, 0.80 to 1.45 percent of Cr, 0.020 to 0.080 percent of Ti, 0.005 to 0.003 percent of B, 0.015 to 0.05 percent of Al, less than 2.5*10-4 percent of H, 30*10-4 to 120 *10-4 percent of N, and less than or equal to 18 *10-4 percent of T.O, Fe and unavoidable foreign matters. The following process route can be adopted for the production: primary smelting furnace (electric furnace or revolving furnace) - refining furnace (LF furnace and the like) - vacuum refining furnace (VD furnace or RH furnace, etc.) - continuous casting - rolling. Compared with 20CrMnTiH and sub-steel number thereof, the boracic pinion steel has high hardenability, stability and narrow flap ...

Boron-containing steel and preparation method thereof

Synthetic slag for removing titanium in molten bearing steel and application thereof

The invention belongs to the field of special steel smelting, and particularly relates to a synthetic slag for removing titanium in molten bearing steel and application thereof. The synthetic slag for removing titanium in molten bearing steel comprises 55-75 wt% of MnO and 25-45 wt% of SiO2. The synthetic slag can be blown in the electric furnace to adsorb TiO2, MnO and SiO2 inclusions, and the titanium oxide is dissolved and adsorbed by the slag to float upward into the electric furnace slag, thereby enhancing the purity of the molten steel. After the slag-free tapping operation, the titanium oxide content in the ladle top slag is very low, thereby greatly lowering the titanium return quantity; and only a trace amount of titanium is increased in the molten steel in the refining process.

Reproductive method for river crab

The reproductive method is that the river crab roe is maintained for survival at low temp. indoor in winter and spring and reproduced at the natural temp. of 28 deg.C in autumn into megalopa, which is then raised into marketable crab.

River crab breeding method

A method for cultivating freshwater crab includes such steps as lowering temp. to 5- -2 deg.C while increasing oxygen supply in juvenile crab culture room and decreasing ketone-containing feed to make juvenile crab bibernating, natural culture in field when ambient temp. is 7-8 deg.C in October, exuviating of juvenile crab, continuous exuviations in March and April next year, and outputting with body wt. up to 150-250g in October.

Boron-containing steel and preparation method thereof

The present invention relates to one kind of boron steel and its preparation process. The boron steel has the chemical composition of C 0.32-0.44 wt%, Si 0.15-0.37 wt%, Mn 1.10-1.40 wt%, P not more than 0.030 wt%, S not more than 0.030 wt%, B 0.0005-0.0035 wt%, Al 0.015-0.070 wt%, and Fe and small amount of impurity for the rest. Its preparation process includes the steps of electric furnace smelting, refining outside the furnace, continuous casting of billet, semi tandem rolling, and vacuum degassing after refining outside the furnace to reach N2 content not more than 80 ppm and O2 content not more than 15 ppm. The billet rolling has a soaking temperature in the heating furnace of 1130-1200 deg.c, heating and high temperature diffusion time of 4-12 hr, cogging temperature of 1080 deg.c, finish rolling temperature of 850-1000 deg.c, and product of round bar in 30-130 mm diameter. The boron steel has high hardenability, and is suitable for making important mechanical members.

Synthetic process and detection method for mianserin hydrochloride

The invention provides a synthetic process and a detection method for mianserin hydrochloride, and relates to Chinese and western medicine preparations for treating depression, in particular to an application of a compound medicine containing the western medicine mianserin hydrochloride as the main ingredient as well as Chinese herbal medicines in treatment of depression. The mianserin hydrochloride compound medicine is prepared from raw materials in parts by weight as follows: 1 part of the mianserin hydrochloride, 40 parts of flos inulae roots, 40 parts of medicated leaven, 35 parts of astragalus, 35 parts of a dandelion, 35 parts of gardenia, 30 parts of centella asiatica, 30 parts of figwort roots, 30 parts of a dwarf lilyturf tuber, 30 parts of red rhodobryum, 25 parts of largehead atractylodes rhizome, 25 parts of immature bitter orange, 20 parts of pine nuts, 20 parts of grassleaf sweelflag rhizome, 20 parts of danshen roots, 18 parts of Chinese angelica, 18 parts of yam, 15 parts ...

Cooling device of small central furnace cover of electric arc furnace

The invention relates to a cooling device of a small central furnace cover of an electric arc furnace, which is characterized by being provided with an annular pipeline (1); a water inlet pipe (2) is arranged on the annular pipeline (1); the other side of the annular pipeline which is opposite to the water inlet pipe (2) is broken off and provided with an opening (3), and pipeline ports (4) at both sides of the opening (3) are sealed; and the lower part of the annular pipeline (1) is provided with a plurality of water outlet holes (5) which are uniformly distributed and outwards inclined a certain angle. The cooling device is installed above the small central furnace cover of the electric arc furnace, has simple structure and convenient use, and can reduce the temperature of the small central furnace cover, especially the temperature of an electrode hole triangular area, and prolong the service life of the small furnace cover mainly by utilizing the functions of direct cooling and vaporization ...

Boracic pinion steel and preparation method thereof

The invention relates to boracic pinion steel and a preparation method thereof. The boracic pinion steel comprises the following component by weight percent: 0.16 to 0.24 percent of C, less than or equal to 0.35 percent of Si, 0.70 to 1.25 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.03 percent of S, 0.80 to 1.45 percent of Cr, 0.020 to 0.080 percent of Ti, 0.005 to 0.003 percent of B, 0.015 to 0.05 percent of Al, less than 2.5*10-4 percent of H, 30*10-4 to 120 *10-4 percent of N, and less than or equal to 18 *10-4 percent of T.O, Fe and unavoidable foreign matters. The following process route can be adopted for the production: primary smelting furnace (electric furnace or revolving furnace) - refining furnace (LF furnace and the like) - vacuum refining furnace (VD furnace or RH furnace, etc.) - continuous casting - rolling. Compared with 20CrMnTiH and sub-steel number thereof, the boracic pinion steel has high hardenability, stability and narrow flap ...

Boron-iron and iron-titanium composite cored wire and application thereof

The invention relates to a boron-iron and iron-titanium composite cored wire and the application thereof. The powdery raw materials of the boron-iron and iron-titanium composite cored wire include boron iron and iron titanium, wherein the boron content of boron iron is not less than 9wt%, the titanium content of iron titanium is not less than 25wt%, and the mixing ratio of boron iron to iron titanium depends on the actual needs. The boron-iron and iron-titanium composite cored wire is manufactured by adding boron iron and iron titanium to molten steel at the same time, thereby simplifying the alloying operation in boron steel smelting and stabilizing the control of boron content in steel. Compared with the prior boron iron cored wire, the boron-iron and iron-titanium composite cored wire has the advantages of low proportion of boron iron, small fluctuation of deviation of the addition amount of boron iron, less loss, adequate protection of each boron iron fine particle by titanium element ...

Medium carbon bearing steel and its preparation method

The invention relates to medium carbon bearing steel and process for preparation, belonging to the technical field of bearing steel material and process technology. According to weight percentage, therange of the chemical components of the medium carbon bearing steel includes that C holds 0.50% to 1.0%, Si is 0.60% to 1.50%, Mn takes 0.50% to 1. 20%, Mo is 0.15% to 1.0%, V takes 0.15% to 1.0%, Crand Ni are equal to or less than 0.30%, Cu is equal to or less than 0.15%, S is equal to or less than 0.025%, P is equal to or less than 0.025%, B takes 0.0005% to 0.0035%, (O) is equal to or less than 15*10-6%, (H) is equal to or less than 2*10-6%, the rest is Fe and unavoidable foreign matters. The invention also provides the process for preparing beating steel, and round steel with the size ofphi 70 to 150 millimeters can be produced by the process for preparation. The bearing steel can substitute for carburizing bearing steel, such as G20CrNi2Mo and the like, to be applied, and can substitute ...

Argon-blowing prefabricated member for continuous casting tundish cover

The invention relates to an argon-blowing prefabricated member for a continuous casting tundish cover and belongs to the technical field of ferrous metallurgical equipment. Argon-blowing prefabricated members with difference sizes can be designed according to the size of a baking hole, a charging hole, a plug hole and the like of the tundish cover. The argon-blowing prefabricated member comprisesa prefabricated member body; the argon-blowing prefabricated member body has a shape of a cone of which the radius of the upper bottom is greater than that of the lower bottom, or the longitudinal section structure of the prefabricated member body is T-shaped. The prefabricated member body is hollow, an aeration pipeline is arranged in the prefabricated member body, and the prefabricated member body is provided with an aeration hole communicated with the aeration pipeline. The argon-blowing prefabricated member solves the problems that the peripheries of the baking hole and the plug hole are deformed ...

Continuous casting tundish for improving cleanliness of molten steel

Method for vacuum smelting titanium alloy containing titanor metal

The invention belongs to the iron and steel smelting field, which particularly relates to a method for smelting titanium-added steel in vacuum and alloying titanium. The invention is characterized inthat titanium alloying is carried on before vacuum treatment. The loss of titanium oxidation in the process of processing molten water in vacuum is no bigger than 0.010%. the problems of unstable titanium content control after molten water is processed in vacuum to alloy titanium and secondary pollution to molten water which is caused in the process of alloying titanium.

Appearance is demonstrated to ballistic pendulum for teaching

The utility model discloses an appearance is demonstrated to ballistic pendulum for teaching, including support, suspension wire, thing piece, jettison device, fixed axle, damping pivot, calibrated scale, bracing piece, base and balanced bolt, the support mounting is in the centre of base, the top and the thing piece of support pass through suspension wire fixed connection, the top at the support on the left side of base is installed to the fixed axle, the damping pivot is installed on the fixed axle, install the pointer in the damping pivot, the lower extreme at the support is installed to the left end of calibrated scale, the right -hand member of calibrated scale is installed on the bracing piece, the bracing piece is fixed on the base, be provided with the scale mark on the calibrated scale, the leftmost side at the base is installed to the jettison device, the bottom at the base is installed to balanced bolt. The utility model has the advantages of simple and reasonable structure, ...

Method for improving and stabilizing boron recovery rate for vacuum smelting steel containing boron

The invention belongs to the iron and steel smelting field, which particularly relates to a method for smelting boron steel in vacuum and improving and stabilizing boron recovery ratio. The invention is characterized in that the method comprises the following steps: alloying boron before molten water vacuum disposal, getting molten water sample to analyze after processing molten water in vacuum, wherein boron recovery ratio is stabilized over 90%, achieving the purpose of producing a same boron containing steel grade, wherein the content deviation of smelting component boron among furnaces is less than 2ppm(namely 0.0002%). And the problems of unstable boron recovery ratio after molten water is processed in vacuum to alloy boron and secondary pollution to molten water which is caused in the process of alloying boron.

Method for performing direct alloying to molybdenum oxide for steelmaking

The invention discloses a method for performing direct alloying to molybdenum oxide for steelmaking. The method comprises the steps of adding a mixed material and a metal material into an electric arc furnace, wherein the mixed material is a mixture of molybdenum oxide and lime, the metal material consists of molten iron and solid steel, and the content of the molten iron is more than or equal to 50wt% on the basis of the total weight of the metal material. According to the method, the procedure for melting ferro-molybdenum alloy can be omitted, the resource utilization rate can be improved, the method is applicable to melting alloy steels with various molybdenum contents, and the economic benefit is tremendous.

Small cover on center of arc furnace

The invention relates to a small cover on the center of an arc furnace, which comprises a fire-proofing material cover body (1) and an electrode hole (2), and is characterized in that a water cooling pipe (3) is arranged inside the fire-proofing material cover body (1), the water cooling pipe (3) is completely arranged inside the fire-proofing material cover body (1), the water inlet end (4) and the water outlet end (5) of the water cooling pipe (3) are arranged on the upper surface of the fire-proofing material cover body (1) to be close to the edge, the water inlet end (4) and the water outlet end (5) of the water cooling pipe (3) which extends out of the fire-proofing material cover body (1) are bent towards the horizontal direction to extend out of the outer edge of the fire-proofing material cover body (1), and the entire water cooling pipe (3) forms a closed loop. The water cooling pipe is embedded inside the fire-proofing material cover body of the small cover on the center of the ...

Nutritional type plant health amendment

The invention relates to liquid type plant nutritional amendment capable of effectively improving plant health and prepared by blending and chelating plant amino acid, chitosan and major elements, middle elements, trace elements, beneficial elements and rare earth elements which are essential for plants. The manufacturing technique is simple, the production cost is low, and no harmful gas or sewage water is generated in the production process. The product of the amendment does not contain artificially synthesized hormone, agricultural chemical substances or any microbial preparation, but can effectively provide about ten nutritive elements and beneficial elements required for the growth of the plants and organic nutrition capable of being directly absorbed and utilized by the plants, and can obviously improve the utilization factor of fertilizer, thereby reducing the investment thereof; at the same time, the product can remarkably improve the health condition of the plants, thereby effectively ...

Continuous casting tundish for improving cleanliness of molten steel

The invention discloses a continuous casting tundish for improving cleanliness of molten steel and belongs to the field of ferrous metallurgy technology. The continuous casting tundish comprises a tundish, porous bricks, an overflow groove, a slag blocking wall and a dam. The continuous casting tundish for improving cleanliness of molten steel provided by the invention makes full use of the double effects of argon foam stirring and cleaning, is safe, practical, simple and convenient, can obviously improve the separation effect of impurities and gases in the molten steel and improve the cleanliness of the molten steel and the quality of billet steel and the like.

Preparation method of tablet for treating premenstrual syndrome and detection method of tablet

The invention relates to a preparation method of a tablet for treating premenstrual syndrome and a detection method of the tablet. The tablet is prepared from the following main raw materials: radix bupleuri, fructus aurantii, dried ginger, radix curcumae, rhizoma cyperi, pericarpium citri reticulatae viride, fructus liquidambaris, semen citri reticulatae, angelica sinensis, radix paeoniae alba, ligusticum wallichii, poria cocos, pericarpium arecae and liquorice. The preparation method of the tablet is characterized by carrying out alcohol extraction on effective traditional Chinese medicine components and decocting the traditional Chinese medicine components to prepare the tablet; the fructus aurantii contains a plurality of glycoside compounds such as naringin, so that the content of the naringin is used as the quantitative control index of the tablet. The table tablet for treating premenstrual syndrome is applied dialectically on the basis of the prior art; all the traditional Chinese ...

Steel scrap basket

The utility model relates to a steel scrap basket, personally experience sth. Part of the body (1) and open and shut at the end (2) its characterized in that including the basket: under the state that draws back in open and shut at the end (2), respectively weld a plurality of direction swash plate (3) in the naked upper and lower both sides position of terminal surface down in the basket body (1) cavity bottom, the interval of each side direction swash plate (3) equals and does not contact with the end of opening and shutting, with the end in it surface parallel during closure state that opens and shuts, this a plurality of direction swash plate (3) component fence type. The utility model discloses an increase the direction swash plate in steel scrap basket, in having realized that the steel scrap is accurate and dropping into the electric stove, reduce outside the steel scrap spills the stove, reduce extravagantly, solve the problem of furnace gate mouth position windrow simultaneously ...

Method for vacuum smelting titanium alloy containing titanor metal

The invention belongs to the iron and steel smelting field, which particularly relates to a method for smelting titanium-added steel in vacuum and alloying titanium. The invention is characterized in that titanium alloying is carried on before vacuum treatment. The loss of titanium oxidation in the process of processing molten water in vacuum is no bigger than 0.010%. the problems of unstable titanium content control after molten water is processed in vacuum to alloy titanium and secondary pollution to molten water which is caused in the process of alloying titanium.

Steel for low-temperature and high-pressure pipeline connector and manufacturing method of continuous casting round billet thereof

The invention relates to steel for a low-temperature and high-pressure pipeline connector and a manufacturing method of a continuous casting round billet thereof. The steel for the low-temperature and high-pressure pipeline connector disclosed by the invention comprises the following components by weight percent: 0.12-0.16% of C, 0.15-0.30% of Si, 1.20-1.45% of Mn, P not more than 0.025%, S not more than 0.015%, 0.15-0.25% of Cr, 0.04-0.10% of V, 0.02-0.05% of Nb, 0.015-0.040% of Alt, H not more than 2.0*10<-4>%, 120*10<-4>% to 260*10<-4>% of N, T.O not more than 15*10<-4>%, and the balance being Fe and inevitable impurities. The steel for the low-temperature and high-pressure pipeline connector provided by the invention has the advantages that the cleanliness is high, components are stable, the welding property is excellent, the strength, the tenacity and the low-temperature impact tenacity are high, and the like.

Boron-iron and iron-titanium composite cored wire and application thereof

The invention relates to a boron-iron and iron-titanium composite cored wire and the application thereof. The powdery raw materials of the boron-iron and iron-titanium composite cored wire include boron iron and iron titanium, wherein the boron content of boron iron is not less than 9wt%, the titanium content of iron titanium is not less than 25wt%, and the mixing ratio of boron iron to iron titanium depends on the actual needs. The boron-iron and iron-titanium composite cored wire is manufactured by adding boron iron and iron titanium to molten steel at the same time, thereby simplifying thealloying operation in boron steel smelting and stabilizing the control of boron content in steel. Compared with the prior boron iron cored wire, the boron-iron and iron-titanium composite cored wire has the advantages of low proportion of boron iron, small fluctuation of deviation of the addition amount of boron iron, less loss, adequate protection of each boron iron fine particle by titanium element ...

Method for smelting nickel-containing steel in short process by utilizing electric furnace

The invention relates to a method for smelting nickel-containing steel in a short process by utilizing an electric furnace. The method is characterized by comprising the following steps of (1) burdening; (2) primarily smelting in the electric furnace; (3) LF (low-frequency) refining; and (4) VD vacuum processing. By adopting the method for smelting the nickel-containing steel in the short process by utilizing the electric furnace, the alloy steel and gear steel with the nickel content of 0.3 to 5 percent can be smelted by the electric furnace in a large range at low cost under the situation that existing process equipment is adequately utilized and no investment is increased.

Arc furnace steelmaking method

The invention discloses an arc furnace steelmaking method, comprising the following steps: preparing raw materials from 30-70% of molten iron, 5-20% of high quality scrap steel, 20-45% of cheap scrap steel and 4-5% of other auxiliary materials based on weight percentage; and refining the raw materials into molten steel by an arc furnace. By the steelmaking method of the invention, electric energyconsumption can be reduced so as to lower the steelmaking cost.

Arc furnace steelmaking method

Electric furnace oxygen lance arrangement structure

The utility model discloses an electric furnace oxygen lance arrangement structure which comprises an electric furnace body, the electric furnace convex cavity is formed in the electric furnace body;the bundling oxygen combustion gun is arranged on the furnace wall of the electric furnace body; and the carbon gun is arranged on the furnace wall of the electric furnace body. The utility model discloses an electric furnace oxygen lance arrangement structure. A bundling oxygen combustion gun is not arranged in an eccentric area; the bundled oxygen combustion guns are all arranged on the furnacewall of the electric furnace body; therefore, the problem of water leakage of the eccentric area convex cavity water-cooling cover plate and the water-cooling block above the gun is effectively solved, the area of a cooling area in the furnace can be reduced, the effect of the cooling area in the furnace is eliminated, the decarburization efficiency can be improved, the smelting period is shortened, ...

Method for removing titanium in molten bearing steel

The invention belongs to the field of special steel smelting, and particularly relates to a method for removing titanium in molten bearing steel. The method comprises the following steps: 1) after finishing slag removal of electric furnace smelting bearing steel in the late oxidation period, adding high-titanium chromium iron into the electric furnace; 2) pre-deoxidating by using silicon-manganese while blowing synthetic slag to adsorb the titanium oxide impurity, wherein the synthetic slag comprises 55-75 wt% of MnO and 25-45 wt% of SiO2; and 3) after finishing blowing the synthetic slag, tapping in a slag-free mode while adding an aluminum deoxidant and calcium aluminate synthetic slag along with the steel flow to perform deoxidation and impurity removal. After the slag-free tapping operation, the titanium oxide content in the ladle top slag is very low, thereby greatly lowering the titanium return quantity; and only a trace amount of titanium is increased in the molten steel in the refining ...

Steel for ball mill steel ball and preparation method thereof

The invention relates to steel for a ball mill steel ball and a preparation method thereof. The steel comprises the following components in percentage by weight: 0.75 to 0.85 percent of C, 0.17 to 0.35 percent of Si, 0.70 to 0.90 percent of Mn, 0.40 to 0.60 percent of Cr, 0.010 to 0.060 percent of Al, more than or equal to 0.20 percent of Cu, more than or equal to 0.20 percent of Ni, more than or equal to 0.030 percent of P, more than or equal to 0.030 percent of S, more than or equal to 0.002 percent of O and the balance of Fe and inevitable impurities. The preparation method comprises steps of smelting, refining outdoors, continuous casting and continuous rolling. The steel has the characteristics of high rigidity, high strength, high wear resistance, short production period, low production cost and capability of substituting high-alloy wear-resistant steel serving as the ball mill steel ball.

Steel for nitrogen vanadium microalloyed grinding rod and preparation method thereof

The invention discloses a steel for a nitrogen vanadium microalloyed grinding rod and a preparation method of the steel. The steel for the nitrogen vanadium microalloyed grinding rod comprises the following chemical components by weight percent: 0.65-0.72% of C, 0.20-0.30% of Si, 1.10-1.50% of Mn, less than 0.025% of P, less than 0.015% of S, 0.10-0.20% of Cr, 0.04-0.10% of V, 0.015-0.040% of Alt, less than 1.5*10<-4>% of H, 100*10<-4>-140*10<-4>% of N, less than 15*10<-4>% of T. O and the balance of Fe and unavoidable impurities. The preparation method of the nitrogen vanadium microalloyed grinding rod comprises the steps of carrying out primary smelting by an electric furnace, refining by a ladle refining furnace (LF), carrying out vacuum degassing (VD), continuously casting, slowly cooling a casting blank, rolling and finishing. The steel for the nitrogen vanadium microalloyed grinding rod is low in production cost, compact and even in structure, high in cleanliness, fine and small in ...

CrMnTi narrow hardenability strip pinion steels and method of manufacture

The invention relates to CrMnTi narrow-hardenability gear steel and a method for manufacturing the same, belonging to the gear steel material and the production process thereof technical field. The chemical composition in percentage by weight of the gear steel is: 0.13-0.23 percent of C, 0.17-0.30 percent of Si, 0.80-1.25 percent of Mn, 0.04-0.10 percent of Ti, 0.90-1.35 percent of Cr, less than or equal to 0.20 percent of Cu, less than or equal to 0.050 percent of S, less than or equal to 0.030 percent of P, less than or equal to 0.05 percent of Mo, less than or equal to 0.25 percent of Ni, [O] less than or equal to 20x10<-6>, [H] less than or equal to 2.5x10<-6>, and the balance being Fe and inevitable impurities. The manufacturing method comprises the following process steps of smelting, continuous casting, rolling and hot rolling, wherein in the step of continuous casting, the superheat degree of a tundish is controlled between 10 and 30 DEG C, and the casting speed is between 0.50 ...

Medium carbon bearing steel and its preparation method

The invention relates to medium carbon bearing steel and process for preparation, belonging to the technical field of bearing steel material and process technology. According to weight percentage, the range of the chemical components of the medium carbon bearing steel includes that C holds 0.50% to 1.0%, Si is 0.60% to 1.50%, Mn takes 0.50% to 1. 20%, Mo is 0.15% to 1.0%, V takes 0.15% to 1.0%, Cr and Ni are equal to or less than 0.30%, Cu is equal to or less than 0.15%, S is equal to or less than 0.025%, P is equal to or less than 0.025%, B takes 0.0005% to 0.0035%, (O) is equal to or less than 15*10-6%, (H) is equal to or less than 2*10-6%, the rest is Fe and unavoidable foreign matters. The invention also provides the process for preparing beating steel, and round steel with the size of phi 70 to 150 millimeters can be produced by the process for preparation. The bearing steel can substitute for carburizing bearing steel, such as G20CrNi2Mo and the like, to be applied, and can substitute ...

Electric furnace burden process with high efficiency and low cost

The invention relates to an electric furnace burden process with high efficiency and low cost. Main raw materials are molten iron accounting for 30-60 percent of metal adding amount, excellent scrap steel accounting for 5-10 percent of metal adding amount and low-lost scrap steel accounting for 30-35 percent of metal adding amount; auxiliary materials are lime and soft burning dolomite, wherein 3.0-3.5 percent of lime and 1.0-1.5 percent of soft burning dolomite are respectively added in each ton of molten steel; and through optimizing electric furnace slag discharge operation, using an oxygenlance and adopting power supply oxygen blowing control and other smelting processes, the electric furnace burden process greatly improves simultaneous hit rate of terminal point components and the temperature of an electric arc furnace, realizes the aims of improving the quality of the molten steel, shortening the smelting period and reducing the consumption and significantly reduces the full oxygen ...

Small cover on center of arc furnace

The invention relates to a small cover on the center of an arc furnace, which comprises a fire-proofing material cover body (1) and an electrode hole (2), and is characterized in that an annular main passage (3) is arranged inside the fire-proofing material cover body (1), the cross shape and the layer quantity of the annular main passage are unlimited, the annular main passage (3) is provided with a main passage opening (4) on the upper surface of the fire-proofing material cover body (1), the inner side of the annular main passage (3) is provided with a plurality of openings (7), each opening (7) is communicated with a small passage (5) with unlimited side surface shape which leads to the lower surface of the fire-proofing material cover body (1) and the electrode hole, and the small passage (5) is inclined downwards to form an angle of 0 to 30 degrees. The small cover is cooled by introduced air and water. On the premise that the fire-proofing material cover body is not damaged, the ...

Soil fertility amendment and preparation method thereof

The invention provides a multifunctional soil nutrient conditioner formula with low cost, practicality and effectiveness and a preparation method thereof aiming at the technical problems. The production technology is simple, the production cost is low, and no harmful gas and sewage are generated during production. The product can effectively provide dozens of nutritive elements required for plant growth, is applied by being combined with a common fertilizer and an organic fertilizer, and can obviously improve the utilization rate of the fertilizer, so as to reduce the fertilizer input; and simultaneously the product can obviously stimulate action of beneficial floras of the soil, inhibit action of causal organisms, and increase the disease suppression of the soil and the resistance of plants, and then can effectively control generation of physiological diseases and soil-borne diseases, so as to reduce the pesticide input. The fertilizer input and the pesticide input can be reduced by more ...

Soil fertility amendment and preparation method thereof

The invention provides a multifunctional soil nutrient conditioner formula with low cost, practicality and effectiveness and a preparation method thereof aiming at the technical problems. The production technology is simple, the production cost is low, and no harmful gas and sewage are generated during production. The product can effectively provide dozens of nutritive elements required for plantgrowth, is applied by being combined with a common fertilizer and an organic fertilizer, and can obviously improve the utilization rate of the fertilizer, so as to reduce the fertilizer input; and simultaneously the product can obviously stimulate action of beneficial floras of the soil, inhibit action of causal organisms, and increase the disease suppression of the soil and the resistance of plants, and then can effectively control generation of physiological diseases and soil-borne diseases, so as to reduce the pesticide input. The fertilizer input and the pesticide input can be reduced by more ...

Special steel with hard exterior and tough interior and manufacture method thereof

The invention relates to a special steel with hard exterior and tough interior and manufacture method thereof, the special steel is obtained by casting two kinds of molten steel with different carbon contents together to form a core portion, an intermediate layer and an outer layer, the carbon content of the outer layer is greater than that of the core portion; the intermediate layer is formed by contacting two kinds of molten steel with different carbon contents naturally; the hardness of the outer layer is greater than that of the core portion. The invention also provides a preparation method of the special steel. The special steel which has a performance of hard exterior and tough interior can be used in the manufacture of various hard-exterior and tough-interior cutters and gears directly, the subsequent processes such as carburizing and nitriding of gear can be omitted and production costs are reduced; the conventional casting and die casting equipment is used in the preparation methods ...

Carbon-manganese composite microalloyed steel for engineering machinery and preparation method thereof

The invention relates to a carbon-manganese composite microalloyed steel for engineering machinery and a preparation method thereof. The steel comprises the following chemical compositions by weight percent: 0.32-0.37% of C, 0.15-0.30% of Si, 1.20-1.40% of Mn, 0.030% or less of P, 0.030% or less of S, 0.0005-0.0030% of B, 0.10-0.60% of Cr, 0.01-0.07% of Al and the balance Fe and trace impurities,wherein the content of available boron in the steel is not less than 95%. The invention also provides a preparation method of the composite microalloyed steel and the method controls the ratio of Ti to N to be 3-6 and the acid soluble aluminium content to be 0.030-0.050% so as to ensure that boron in the steel is almost available boron. The preparation method of the invention controls the contentof trace element boron and ensures the hardenability of steel so that the steel is suitable to be used for the preparation of important mechanical parts.

CrMnTi narrow hardenability strip pinion steels and method of manufacture

The invention relates to CrMnTi narrow-hardenability gear steel and a method for manufacturing the same, belonging to the gear steel material and the production process thereof technical field. The chemical composition in percentage by weight of the gear steel is: 0.13-0.23 percent of C, 0.17-0.30 percent of Si, 0.80-1.25 percent of Mn, 0.04-0.10 percent of Ti, 0.90-1.35 percent of Cr, less than or equal to 0.20 percent of Cu, less than or equal to 0.050 percent of S, less than or equal to 0.030 percent of P, less than or equal to 0.05 percent of Mo, less than or equal to 0.25 percent of Ni, [O] less than or equal to 20x10<-6>, [H] less than or equal to 2.5x10<-6>, and the balance being Fe and inevitable impurities. The manufacturing method comprises the following process steps of smelting, continuous casting, rolling and hot rolling, wherein in the step of continuous casting, the superheat degree of a tundish is controlled between 10 and 30 DEG C, and the casting speed is between 0.50 ...

Preparation process of drug particles used for after-delivery blood stasis removal

The invention relates to a preparation process of drug particles used for after-delivery blood stasis removal. The drug particles are prepared by 1248 parts of leonurus, 156 parts of angelica sinensis, 178 parts of ligusticum wallichii and 78 parts of baked ginger and pelleted according to conventional methods. On the basis of the prior art, the drug particles for after-delivery blood stasis removal are applied dialectically, and various components of traditional Chinese medicine are matched to coordinate effect, so that the preparation process is low in cost and has excellent treatment effect for the after-delivery blood stasis removal via clinical test and wide application prospect.

Method for improving and stabilising boron recovery rate for vacuum smelting steel containing boron

The invention belongs to the iron and steel smelting field, which particularly relates to a method for smelting boron steel in vacuum and improving and stabilizing boron recovery ratio. The invention is characterized in that the method comprises the following steps: alloying boron before molten water vacuum disposal, getting molten water sample to analyze after processing molten water in vacuum, wherein boron recovery ratio is stabilized over 90%, achieving the purpose of producing a same boron containing steel grade, wherein the content deviation of smelting component boron among furnaces is less than 2ppm(namely 0.0002%). And the problems of unstable boron recovery ratio after molten water is processed in vacuum to alloy boron and secondary pollution to molten water which is caused in the process of alloying boron.