Boron-containing steel and preparation method thereof

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.

Technology for fabricating foaming slag in arc furnace molten pool

The invention discloses a technology for fabricating foaming slag in an arc furnace molten pool. The technology comprises the following steps: using a powder spraying tank and a powder spraying tank conveying pipeline to spray carbon powder containing powder material for producing foaming slag, into an arc furnace, controlling the slag alkalinity, FeO content, and molten pool temperature, wherein the carbon powder containing powder material for producing foaming slag is a graphite-like material, the fixed carbon content is not less than 80%, the water content is not more than 0.5%, the particle size is less than 3 mm; and continuously and evenly spraying the graphite-like material to the slag surface in the arc furnace to produce foaming slag when the temperature of the arc furnace molten pool reaches 1550 to 1600; wherein the spraying pressure is 0.3 to 0.5 MPa, the spraying strength is 15 to 25 kg/min, and the spraying amount is 6 to 7 kg/t. The graphite-like powder material is adopted ...

Method for preparing bearing steel

The invention relates to a method for preparing bearing steel. The method comprises the following steps of smelting, and alloying; carrying out continuous casting; rolling; carrying out slow cooling, and the like. The chemical components in the bearing steel are controlled in percentage by weight as follows: 0.95%-1.05% of C, 0.20%-0.30% of Si, 0.30%-0.35% of Mn, 0.02%-0.05% of Mo, 1.45%-1.48% of Cr, 0.015%-0.035% of AlS, less than or equal to 0.05% of Cu, less than or equal to 0.025% of S, less than or equal to 0.025% of P, less than or equal to 0.05% of Ni, less than or equal to 12*10<-6> of [O], less than or equal to 2*10<-6> of [H] and the balance of Fe and inevitable impurities. According to the bearing steel produced through the method disclosed by the invention, the total oxygen content of a steel product can be stably controlled below 8 ppm, non-metallic inclusions are low in content and uniformly distributed, and good casting blank structure homogeneity, steel quality stability ...

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.

Metallic halide lamp ballast for fishing

The utility model relates to a metallic halide lamp ballast. The utility model mainly solves the problem that a ballast can not display whether the lamp connected with the ballast is started. The utility model has a top autotransformer and a capacitor, and is characterized in that two series resistances are connected in parallel with the capacitor, one resistance is connected in parallel with a main body indicating lamp, and the other resistance is connected in parallel with an external connected indicating lamp. The utility model is especially suitable for fishing vessels.

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

Method for preparing carbonaceous autoreduction cold pressing block and application thereof

The invention relates to a method for preparing a carbonaceous autoreduction cold pressing block by using electric stove dust-removing ash and iron scales and the application thereof. The carbonaceous autoreduction cold pressing block comprises the following raw materials by the weight percent: 40 to 50 of iron scale, 20 to 30 of electric stove dust-removing ash, 20 to 25 of carbon powder and 5 to 8 of bonding agent. The method for preparing the carbonaceous autoreduction cold pressing block comprises the following steps: the raw materials are evenly stirred in proportion and are pressed and molded by a double-roll block-press machine of 190 tons, and a mold is placed in dry environment of above 50 DEG C for 30 to 36 hours to form the high-strength carbonaceous cold pressing block which is directly used for electric stove steelmaking smelting. The method has simple technology, low energy consumption, high strength and no environmental pollution. When the carbonaceous autoreduction cold ...

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.

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 ...

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 ...

Recycling method for refining slags

The invention relates to a recycling method for refining slags. The method comprises the following steps: adding an iron-containing oxide material into liquid refining slags in an online mode to carry out online modification, so that the iron content of an obtained mixture reaches 5-30% by mass; and cooling the obtained product so as to cure the product, and crushing the obtained object, so that a desulfurized dephosphorizing agent is obtained. According to the invention, refining slags can be recycled maximally, and the consumption of energy and materials in the entire process can be significantly reduced, so that the utilization rate of resources is improved, and the environmental load is reduced, therefore, the method has remarkable economic benefits, and can increase the comprehensive utilization rate of steel slag resources in our country and provide a strong technical support for circular economy.

Method for producing continuous casting round billet of wind power tower cylinder flange steel

The invention discloses a method for producing a continuous casting round billet of wind power tower cylinder flange steel. The method comprises the steps that the degree of superheat of continuous casting liquid steel is controlled within the range from 21 DEG C to 25 DEG C in the continuous casting process; air water atomizing cooling serves as the cooling mode in a secondary cooling area, the specific water flow is controlled within the range from 0.15 L/kg to 0.18 L/kg, the casting speed is controlled within the range from 0.30 m/min to 0.34 m/min, the current of electromagnetic stirring of a crystallizer is controlled within the range from 200 A to 300 A, the frequency of electromagnetic stirring of the crystallizer is controlled within the range from 2.0 Hz to 3.0 Hz, the current of electromagnetic stirring of the tail end of solidification is controlled within the range from 350 A to 400 A, and the frequency electromagnetic stirring of the tail end of solidification is controlled ...

Method for preparing carbonaceous autoreduction cold pressing block and application thereof

The invention relates to a method for preparing a carbonaceous autoreduction cold pressing block by using electric stove dust-removing ash and iron scales and the application thereof. The carbonaceous autoreduction cold pressing block comprises the following raw materials by the weight percent: 40 to 50 of iron scale, 20 to 30 of electric stove dust-removing ash, 20 to 25 of carbon powder and 5 to 8 of bonding agent. The method for preparing the carbonaceous autoreduction cold pressing block comprises the following steps: the raw materials are evenly stirred in proportion and are pressed and molded by a double-roll block-press machine of 190 tons, and a mold is placed in dry environment of above 50 DEG C for 30 to 36 hours to form the high-strength carbonaceous cold pressing block which is directly used for electric stove steelmaking smelting. The method has simple technology, low energy consumption, high strength and no environmental pollution. When the carbonaceous autoreduction cold ...