Ferromanganese for refining deoxidizing of Si-Mn deoxidized steel and using method thereof

The invention provides a ferromanganese for the refining deoxidizing of Si-Mn deoxidized steel and a using method thereof. The ferromanganese comprises the following components in percentage by weight: 94-99% of Mn, P<0.01%, S<0.01%, Al<0.02%, N<0.02%, and the balance of iron and inevitable impurities. The using method comprises the following steps of: 1, drying (at the temperature of 80-200 DEG C for 1-5 hours); 2, adding the ferromanganese (measuring the components of liquid steel for three times after the tapping of a rotating furnace, 10-20 minutes after LF (Low Frequency) refining is started and 10-20 minutes before the LF refining is finished, and respectively adding the ferromanganese according to specified requirements); and 3, processing the refined liquid steel (standing the liquid steel, and carrying out soft argon blowing). The contents of residual Al and N contained in the Si-Mn deoxidized steel are obviously reduced through a method carrying out refining deoxidizing alloying ...

Silicon iron for refining, deoxidizing and alloying Si-Mn deoxidized steel and using method thereof

The invention provides silicon iron for refining, deoxidizing and alloying Si-Mn deoxidized steel, which comprises the following components: more than 96 percent of Si, less than 0.02 percent of Al, less than 0.01 percent of P, less than 0.01 percent of S, less than 0.020 percent of N and the balance of iron and inevitable impurities. The using method of the silicon iron comprises: 1) a step of drying, which is to dry at 80 to 200 DEG C for 1 to 5 hours; 2) a step of adding for the first time, which is to measure the components of molten steel 10 to 20 minutes later after the beginning of low frequency (LF) refining and add silicon iron in an amount which is 0.02 to 0.06 percent lower than that required by the target value of the silicon content of the molten steel; 3) a step of adding for a second time, which is to measure the components of the molten steel again 10 to 20 minutes before the end of the LF refining and add silicon iron again till the silicon content of the molten steel reaches ...

Manganese-containing steel alloying process

The invention provides a manganese-containing steel alloying process. The alloying process includes: 1) a step of baking a steel ladle, wherein manganese ore blocks having a particle size of 10-50 mm and a sulphur content smaller than 0.05% and a phosphorus content smaller than 0.05% are added into the steel ladle, addition and matching are performed according to the middle of the manganese content limit, the baking temperature is higher than 1000 DEG C, the baking time is longer than 2 h, and the steel ladle is covered with a steel ladle cover in a conveying process after baking; 2) a step of converter operation, wherein the tapping temperature is performed according to the middle limit and the upper limit, the temperature of the molten steel is 1685-1705 DEG C, the temperature of the molten steel in the steel ladle is guaranteed to be not less than 1670 DEG C, the carbon content in the end point is more than 0.08%, the slag quantity discharged from the converter is controlled, the thickness ...

在线检测钢中夹杂物粒径分布的光谱分析方法

The invention provides a spectrum analyzing method of on-line detecting the particle size distribution of inclusions in the steel. On the nitrogen condition, make predischarge and formal spark discharge between the metal sample and electrode pair, make light split analysis on metal element and inclusion-monitor oxygen element, use data processor to make programming and calculating processing on the spectrum data to calculate the total strength of the inclusions, calculate out the contain of the inclusions in the sample according to the preset inclusion strength-content correcting curve, calculate out the particle size distribution of the inclusions according to the weight difference of the sample excited before and after, according to 10 measured results of the particle size distribution and by extremum statistical method, calculate the maximum particle size of the inclusions. It controls refining course according to the detecting result, thus remarkably reducing the rejection quantity ...

Submerged arc welding wire for pipe line steel and method for manufacturing submerged arc welding wire

Manganese boron deoxidizer and using method thereof

The invention discloses a manganese boron deoxidizer and a using method thereof. The manganese boron deoxidizer comprises the following chemical components in percentage by weight: 87 to 97 percent of manganese, 2 to 12 percent of boron and less than or equal to 1.5 percent of impurities and has the granularity of 50 to 100 mm. The using method comprises the following steps of: baking the raw materials at 80 to 160 DEG C for 6 to 15 hours till the water content is less than 0.5 percent; adding the deoxidizer under the condition that the oxygen activity of steel liquid is (5-30)*10<6>, wherein the addition amount is 1 to 4 kg/t; during refining the steel liquid, adding the deoxidizer under a condition that the temperature of the steel liquid is between 1540 and 1610 DEG C based on the standard of 2 to 6 kg/t and stirring by introducing argon at the same time, wherein the flow rate of the argon is kept in the range from 200 to 400 NL/min, and the stirring time is 5 to 20 minutes; and under ...

Method for formulating blowing parameters of single-flow arc-shaped channel air curtain retaining wall induction heating tundish

The invention relates to a method for formulating blowing parameters of a single-flow arc-shaped channel air curtain retaining wall induction heating tundish, which comprises the following steps of: calculating a three-dimensional flow heat transfer model according to casting working condition parameters and blowing parameters of an air curtain retaining wall to obtain electromagnetic force and Joule heat of the single-flow arc-shaped channel induction heating tundish; calculating the three-dimensional flow heat transfer model according to the electromagnetic force and Joule heat to obtain a flow field and a temperature field of the single-flow arc-shaped channel induction heating tundish; and calculating according to the flow field and the temperature field to obtain the inclusion removal rate of the single-flow arc-shaped channel induction heating tundish. The method has the advantages that the influence of different air blowing amounts is considered, and the optimization effect of the ...

Additive for preparing fine oxide dispersion steel, preparation and use thereof

The invention relates to an external furnace refining technology for steelmaking, in particular to an additive for preparing fine oxide dispersion steel, a method for making the same and an application of the additive. The invention belongs to the metallurgical technology field. The additive is a composite sphere consisting of a sphere core and a shell; and the shell of the composite sphere mainly consists of one or two compounds of calcium oxide or magnesia, wherein, the sphere core consists of one material mainly comprising beneficial oxide and swelling agent or another material mainly comprising low-melting point pre-smelting slag powder and swelling agent. Through adopting wire feeding, powder spraying and pill shooting, or even a direct throwing mode, the additive is fed in LF, RH, VD or CAS-OB in order that the oxide class impurity is fine, dispersed and distributed in steel; the addition type is beneficial for application and can stably and rapidly produce fine oxide dispersion steel ...

Ladle covering flux and use method thereof

The invention relates to a ladle covering flux for preventing temperature drop of the molten steel after treatment with a converter, which is characterized in that the ladle covering flux mainly consists of the following components in percentage by weight: 91-99% of lime and 1-9% of calcium carbide. In the use method of the ladle covering flux, 1-8 Kg of the ladle covering flux is added to every ton of molten steel, and the granularity is 0-100 mm. In the use method of the ladle covering flux, 1-8 Kg of the ladle covering flux is added to every ton of molten steel, and the granularity is 0-80mm; the argon can blown after producing steel and in the process of transferring; and the upper limit of the argon flow is reached when the surface of the steel liquid does not turn. The ladle covering flux and use method provided by the invention have the advantages that: air isolation and heat preservation are ensured; the temperature drop in the process of transferring the molten steel is reduced ...

Stainless steel and preparation method thereof

The invention relates to stainless steel and a preparation method thereof. The stainless steel comprises the following chemical components: 0.010%-0.025% of C, 0.20%-0.60% of Si, 1.0%-1.5% of Mn, less than or equal to 0.03% of P, less than or equal to 0.0006% of S, 21%-23% of Cr, 3.5%-4.4% of Ni, 1.5%-2.4% of Mo, 0.0010%-0.0026% of B, 0.0015%-0.0030% of Mg, 0.0010%-0.0030% of T.O, 0.13%-0.20% of N and the balance of iron and impurities. By increasing the content of magnesium and boron in the steel, the fine grain strengthening effect is achieved, the mechanical property, corrosion resistance and welding performance of the steel are improved, the adding amount of precious alloys such as nickel and molybdenum is reduced, resources are saved, and the production cost is reduced; the stainless steel is simple in production process, stable in product performance and safe and reliable to use.

Metal carbide core-shell coated iron-based composite powder and preparation method thereof

The invention relates to metal carbide core-shell coated iron-based composite powder and a preparation method thereof. The iron-based composite powder is composed of metal/carbide coated iron-based powder particles. The metal carbide core-shell takes iron-based powder particles with high M alloy content as a core and takes metal carbide MXCY formed by a metal element M as a shell, and the volume fraction of carbide in the metal carbide MXCY shell layer is in gradient change in the radial direction of the iron-based powder particles. Spherical iron-based powder particles prepared through a gas atomization method serve as a core, the surfaces of the spherical iron-based powder particles are coated with metal/carbide core shells through an in-situ reaction, the spherical morphology of original iron-based powder is reserved so as to guarantee the fluidity of the iron-based powder, and finally the iron-based composite powder coated with the metal/carbide core shells is prepared. And a high-quality ...

Inclusion control method for pipeline welding wire steel

The invention provides an inclusion control method for pipeline welding wire steel, which comprises the following steps of: (1) converter back deoxidization: performing strong deoxidization on molten steel by adopting aluminum melt on the rear converter after the welding wire steel converter finishes smelting; (2) low-frequency (LF) converter refining: after the oxygen activity of the molten steel of the rear converter is not more than 20*10<-6>, performing LF converter refining treatment on the molten steel; forming slag in 10 to 20 minutes when the LF refining begins, and adding fluorite, wherein the alkalinity of top slag is 1.5 to 4.0, and the content of Al2O3 is 15 to 25 percent; adding titanium and iron at the medium term of refining for further deoxidization, wherein the LF argon blowing time is 25 to 35 minutes, the argon flow is 300 to 400N1/min, and the temperature of the molten steel in the refining process is between 1,550 and 1,630 DEG C; and (3) molten steel argon blowing ...

Uniflow arc-shaped channel air curtain retaining wall induction heating tundish and pouring method

The invention relates to a single-flow arc-shaped channel air curtain retaining wall induction heating tundish and a pouring method. The tundish comprises a tundish body, an induction heating device and an air curtain retaining wall device. The steel flowing channel is an arc-shaped channel; the induction heating device is composed of an iron core, a coil and a power source, and the air curtain retaining wall device is arranged in the pouring area. According to the method, a three-dimensional unsteady mathematical model is established, and coupling calculation is carried out on a flow field, a temperature field, inclusion transmission behaviors and the like in the induction heating tundish; an air curtain retaining wall technology and a channel induction heating technology are combined, so that the problem of temperature drop is solved, and respective advantages of the air curtain retaining wall technology and the channel induction heating technology are fully exerted; the problem that ...

Using method of manganese boron deoxidizer

在线检测钢中夹杂物个数和含量的光谱分析方法

The invention provides a spectrum analyzing method of on-line detecting the number and content of inclusions in the steel. On the nitrogen condition, make predischarge and formal spark discharge between the metal sample and electrode pair, make lighting and light split analysis on the metal element and oxygen element, research and determine the critical value of metal element inclusion strength and that of inclusion-monitoring oxygen element strength, find out the abnormal pulse of metal element of each critical value of inclusion strength, and determine the number of the inclusions. By data processing and in comparison with the preset correcting curve of inclusion strength and content, determine and analyze the content of the inclusions in the sample. It can analyze the element content and fast analyze the content of inclusions in the sample, samples and detects the number and content of the inclusions in the refining procedure and controls the refining technique according to the detecting ...

Silicon-boron deoxidizer and using method

The invention discloses a silicon-boron deoxidizer and a using method, containing: 2-10% of boron, 88%-98% silicon, and less than 1.5% of impurity, wherein the graininess of the deoxidizer is 50-100mm. The raw material is baked under 70-150 DEG C for 8-16h for making moisture less than 0.5%; the deoxidizer is used 10-20min before refining finish; the molten steel temperature is 1550-1620 DEG C, the refining slag alkalinity is 2.0-4.5, and the FeO content in the refining slag is less than 1%; the silicon-boron deoxidizer is added into the steel in the standard of 0.5-4kg/t, and argon stirring is performanced when the deoxidizer is added; and the boron in the deoxidizer of the the invention is used for removing or fixing nitrogen in the steel, resolves the current problem of denitrificationand nitrogen fixation while deoxidation, and deoxidizer per kilogram can remove or fixing 0.05-0.1ppm nitrogen in the steel, thereby achieving the purpose for purifying the steel.

High temperature low heat conduction refractory material and production process thereof

The present invention discloses a high temperature low heat conduction refractory material and production process thereof, which uses fused magnesia aggregate, magnesite micro powder, calcium zirconate micro powder and agglutinant as raw materials. The raw materials are processed into refractory castable in a proper grain size. The refractory material comprises: fused magnesia aggregate thirty percent to seventy-five percent by weight; magnesite micro powder five percent to ten percent by weight; calcium zirconate micro powder five percent to twenty percent by weight; agglutinant five percentto fifty percent by weight. The production process of the refractory material is as follows: mixing the raw materials well in proportion in a mixer, molding by a high stroke friction press, drying the molded product, sintering the molded product at the temperature of 1200 to 1400 DEG C for five to ten hours. Compared with the present refractory materials, the invention is advantaged by: improvingtoughness ...

Boron-containing high carbon steel wire rod for manufacturing wires and production method thereof

The invention provides a boron-containing high carbon steel wire rod for manufacturing wires and a production method thereof. The steel wire rod comprises the following components: 0.6 to 0.9 percent of C, 0.1 to 1.0 percent of Si, 0.3 to 1.0 percent of Mn, 0.001 to 0.010 percent of B, less than 0.002 percent of Al, less than 0.025 percent of P and S, and the balance of iron and inevitable impurity. The production method comprises molten iron pretreatment, converter smelting, low-frequency (LF) refining, continuous casting, continuous rolling and wire rolling. The production method is characterized in that: high-carbon tapping is adopted in the converter tapping process, and the content of carbon is controlled at 0.05 to 0.2 percent of the target component; 2 to 3 kg/t of white ash is used for covering a tank; and a low overheat continuous casting process schedule is used in the continuous casting process, and the overheat degree of the molten steel of the tundish is between 12 and 25 DEG ...

Controlled-cooling method for rolled high carbon steel wire rod

The invention discloses a controlled-cooling method for a rolled high carbon steel wire rod, which comprises controlled-cooling on a roller way after spinning. The method is characterized in that: the cooling roller way is sunken; a water tank is arranged at a sunken part; the roller way is accommodated in the water tank containing water; and the spun wire rod enters the water tank for the controlled-cooling, and is discharged out of the water tank and cooled to room temperature. The controlled-cooling method for the rolled high carbon steel wire rod increases the sorbitizing rate of the highcarbon steel wire rod from 80 to 85 percent in an air cooling process to over 95 percent.

RH-OB molten steel refining method

The invention provides a RH-OB molten steel refining method which is capable of reducing Al2O3 foreign impurities in steel. When Al is added to carry out temperature rise by blowing oxygen, the method also adds remelted slag of the following components at an addition of 0.7 time to 1.4 times of the A1 amount: 45 percent to 49 percent of CaO, 42 percent to 48 percent of Al2O3, 2 percent to 6 percent of MgO and 1 percent to 3 percent of SiO2. The particle size of the remelted slag is 10mm to 20mm. Steel produced by the method has no cluster Al2O3 foreign impurity, the area content of the Al2O3 foreign impurity in the steel is reduced from 0.0030 percent of the original technique to 0.0020 percent by 33.33 percent and total oxygen is reduced from 0.0020 percent to 0.0037 percent to 0.0015 percent to 0.0020 percent, thereby greatly reducing waste amount generated on the surface of a cold rolled plate due to the Al2O3 foreign impurity.

Process for smelting and continuously casting boron-containing high carbon steel for wire production

The invention provides a process for smelting and continuously casting boron-containing high carbon steel for wire production. The process comprises the following steps of: 1) pretreating molten iron, namely controlling the sulphur content to be below 0.005 percent; 2) smelting by using a converter, namely producing high-basicity dregs at the earlier stage, wherein the basicity of the top dregs is 2.0 to 4.5, the FeO content is 8 to 20 percent, and the final temperature is between 1,600 and 1,680 DEG C; performing high-carbon tapping at the end of the smelting, namely controlling the carbon content to be 0.05 to 0.2 percent of the target carbon content of the steel; deoxidizing by using Si-Mn; and covering the pot by using 1 to 3 kg/t of white ashes after tapping; 3) refining by using a ladle furnace (LF), namely refining at the temperature of between 1,550 and 1,620 DEG C; adjusting molten steel components according to the target boron content of the steel before the end; and 4) performing ...

Method for performing pre-desiliconization on molten iron by utilizing CAS-OB refining furnace

The invention discloses a method for performing pre-desiliconization on molten iron by utilizing a CAS-OB refining furnace. The method comprises the following steps of performing desiliconization treatment on molten iron by utilizing the existing CAS-OB refining furnace of a steel plant, providing low-silicon molten water for a converter or an electric furnace. The special process is as follows: performing slagging-off treatment on the molten iron by adopting a special high-temperature-resistant magnesia carbon brick molten iron tank for desiliconization, blowing oxygen gas or air by utilizing a spray gun above an immersion cover of the refining furnace, controlling the flow rate to 5-10Nm<3>/h.t, stopping blowing gas from the top spray gun when a slag layer reaches 30-80mm, opening a bottom-blowing gas valve to blow gas and stir, wherein the gas flow rate is 80-100Nm<3>/h; descending the cover after removing the slag layer, blowing oxygen gas or air by adopting the spray gun above the ...

Additive for preparing fine oxide dispersion steel, preparation and use thereof

The invention relates to an external furnace refining technology for steelmaking, in particular to an additive for preparing fine oxide dispersion steel, a method for making the same and an application of the additive. The invention belongs to the metallurgical technology field. The additive consists of raw materials proportioned according to a formula; low-melting point pre-smelting slag powder, calcium fluoride, calcium carbonate, magnesium carbonate or a mixture of calcium carbonate and magnesium carbonate, calcium oxide, magnesia or a mixture of calcium oxide and magnesia and caking agent are respectively adopted and prepared to additives with various additive types of core-spun yarn, powder, a composite pellet and a composite sphere; through adopting wire feeding, powder spraying and pill shooting, or even a direct throwing mode, the additive is fed in LF, RH, VD or CAS-OB in order that the oxide class impurity is fine, dispersed and distributed in steel; and the addition type is beneficial ...