107 results about "Castability" patented technology

The invention provides a method for improving continuous casting castability of rare earth structural steel, which is mainly characterized in that La-Ce rare earth alloy is added into a steel ladle for La-Ce rare earth treatment after deoxidation and desulfurization treatment of molten steel is completed, the La-Ce rare earth content is 20-30ppm, the argon flow in the bottom argon blowing process is 200-300L / min, the soft blowing time is not less than 8min, and the argon pressure is 0.3-0.4 MPa. Through deoxidation process optimization, alloy element content control, refining outbound temperature control, calcium treatment process optimization, continuous casting protection pouring process optimization and the like, the purpose of improving the transverse impact performance of the plate is achieved on the premise that the continuous casting castability is not affected, and the key process for improving the continuous casting castability of the rare earth structural steel is formed. Compared with the prior art, the excellent transverse impact performance of the plate is obtained, and the castability of continuous casting is not affected.

The invention discloses a method for improving castability of a high-purity industrial pure iron small square billet production line. The method comprises the following steps of KR molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment and continuous casting. According to the method, in the early stage of LF, oxidizing slag is used for removing manganese and phosphorus, in the later stage, slagging-off modification treatment is carried out, a minimum LF and minimum outbound oxygen formula is formulated, so that the RH carbon-oxygen reaction requirement is met, vacuum natural decarburization is used, RH end point carbon can be stably controlled to be 0.0007-0.001%, after RH aluminum is added for deoxidation, a calcium deoxidizing agent is added under the low-true-degree condition for inclusion denaturation, and the RH carbon-oxygen reaction requirement is met. By means of the method, continuous production can be achieved on an industrial pure iron small square billet production line, the finished product C is smaller than or equal to 0.0015%, Mn is smaller than or equal to 0.025%, P is smaller than or equal to 0.003%, S is smaller than or equal to 0.003%, the high industrial level can be achieved, the number of continuous casting furnaces is larger than or equal to 7, and the method is particularly suitable for producing pure iron on a production line without RH top lance equipment in the RH procedure.

The invention discloses a method for improving castability of aluminum-containing steel in a continuous casting process, which comprises the following steps of: S1, controlling components of molten steel, and accurately controlling the content of acid-soluble aluminum in molten steel of a continuous casting ladle to be 0.020-0.060% according to mass percent; s2, calcium treatment is conducted on the molten steel, and the calcium-aluminum ratio is controlled to range from 0.10 to 0.15; s3, continuous casting process control is conducted, specifically, the superheat degree of tundish molten steel is stably controlled to range from 15 DEG C to 30 DEG C, meanwhile, constant pulling speed operation is adopted, and the pulling speed fluctuation range is controlled within + / -0.1 m / min; and S4, the content of SiO in the casting powder is reduced to be smaller than or equal to 20%, and meanwhile, the alkalinity R of the casting powder is 1.5-2.0. The continuous casting process is ensured to be smooth, nozzle nodulation and casting blank surface defects are effectively prevented, and the production efficiency and the product quality are remarkably improved.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a production method of low-silicon sulfur-added high-aluminum gear steel which comprises the following chemical components in percentage by weight: 0.15%-0.20% of C, 0.06%-0.12% of Si, 1.35%-1.55% of Mn, 0.035%-0.055% of S, 1.10%-1.20% of Cr, 0.035%-0.055% of Al, 0.012%-0.016% of N, less than or equal to 0.0010% of O and the balance of Fe and inevitable residual elements. The overall process route of the production method comprises the steps of converter primary smelting, tapping pre-calcification and sulfurization, LF refining slagging, RH vacuum treatment and continuous casting protection pouring. By optimizing the composition of the refining slag, controlling the sulfur content in stages and co-processing calcium and aluminum, the continuous casting castability problem of the low-silicon sulfur-added high-aluminum gear steel is effectively solved, and the liquid level fluctuation percent of pass of a crystallizer is greater than 99%.

The invention discloses a continuous casting submersed nozzle for improving castability of rare earth steel, the continuous casting submersed nozzle comprises a nozzle body, a slag line and an inner hole body, the inner hole body is a ZrO2-CaO-C material, the raw material of the inner hole body is calcium zirconate and graphite, and the inner hole body material comprises the following components in percentage by weight: 45-59% of ZrO2, 18-22% of CaO, 20-32% of C and the balance of inevitable impurities. According to the method, the problems of nodulation and blockage of the submersed nozzle in the continuous casting production process of the rare earth steel and reaming caused by poor corrosion resistance in use can be effectively relieved, the castability of the rare earth steel under multi-furnace continuous casting can be ensured, and the method is beneficial to improving the quality of a casting blank and realizing efficient and stable production of continuous casting.

The invention discloses a production method of high-cleanliness ultra-low carbon series steel. The production method comprises the steps of deep desulfurization of KR molten iron, converter smelting, LF refining, RH furnace and continuous casting. In order to improve the control level of the inclusions in the steel, analysis is carried out by combining generation and removal of the inclusions in actual production processes such as a converter process, an RH refining process and a casting machine process, a removal process for reducing generation of the inclusions in the production process and optimizing the inclusions is formulated, and secondary oxidation in the casting process of a casting machine is prevented. And an ultra-low-carbon high-cleanliness converter end point control process, an RH refining ultra-low-carbon deoxidation process, an RH refining top slag modification process, casting machine castability research and casting blank quality control are researched. And high-cleanliness stable control over the low inclusions of the ultra-low-carbon high-cleanliness steel is achieved.

The invention provides a high-strength motor rotor aluminum alloy and a high-pressure casting method and application thereof, and relates to the technical field of new energy automobile motor rotor materials. The high-strength motor rotor aluminum alloy comprises 0.28%-0.32% of Si, 0.68%-0.74% of Mg, 0.3%-0.35% of Fe, smaller than or equal to 0.05% of Ti, smaller than or equal to 0.03% of Ga, smaller than or equal to 0.03% of Zn, smaller than or equal to 0.03% of Cu, smaller than or equal to 0.01% of Mn, smaller than or equal to 0.01% of inevitable impurities and the balance Al. Mg, Si and Fe are added into the aluminum alloy, and the ratio of all the elements is adjusted to be reasonable, so that the aluminum alloy has good flowability and castability, air holes, cracks and other defects are avoided in the high-pressure die-casting process, the obtained rotor further has excellent toughness, ductility and mechanical performance, the defects in the prior art are overcome, and the aluminum alloy rotor is suitable for industrial popularization.

The present invention discloses a high-strength, wear-resistant aviation aluminum alloy material and a preparation method. The material belongs to the field of alloy material technology and comprises the following components, calculated by weight: 3.8-5.2% Si, 2.5-3.3% Cu, 1.6-2.4% Zn, 1.2-1.8% Mg, 1.1-1.7% Mn, 0.3-0.52% Zr, 0.6-1.3% nano-TiC particles, with the remainder being Al and unavoidable impurities. The aluminum alloy material of the present invention has high strength, excellent wear resistance, excellent high-temperature resistance, and good castability. Furthermore, the preparation method is simple and the process is easily controlled.

The invention relates to the technical field of steel and iron smelting, in particular to a smelting method of ultra-low carbon steel, which overcomes the defects that secondary oxidation of blown molten steel after strong drawing of a converter easily causes deterioration of steel cleanliness, causes blockage of a water gap and further causes pouring interruption. According to the smelting method, the carbon element content and the oxygen element content in molten steel components are accurately controlled, the cleanliness of the molten steel is improved, ultra-low carbon steel production is achieved under the condition that a converter lining is not damaged, and the castability of the molten steel is ensured through continuous casting protection casting. Meanwhile, the smelting method is safe, reliable, convenient to operate and suitable for mass production.

The invention belongs to the technical field of steelmaking processes, and particularly relates to an LF furnace desulfurization method for high-sulfur molten iron. Comprising the following steps that (1) passivated lime and passivated magnesium powder are injected for desulfurization, the injection treatment time is 400-700 seconds, and when the S content is 0.050-0.060%, a converter working procedure is carried out; (2) active lime, high-magnesium lime and a slag former are added, the alloy is added when one third of tapping is carried out, and the active lime is added into a steel ladle when converter molten steel leaves a station; and (3) when the molten steel enters an LF (ladle furnace), firstly carrying out oxygen determination and aluminum wire feeding, controlling Als in the molten steel to a steel judgment middle limit, then carrying out arc starting and slagging, adding aluminum particles, lime and a fluoride-free slagging agent in two batches after 2 minutes, carrying out bottom blowing of argon, carrying out secondary temperature measurement and oxygen determination after slagging is completed, carrying out submerged arc after alloy addition is completed, and adding a high-aluminum slag modifier. The method has the effect of improving the castability of the molten steel, a slag system better meets the cleanliness requirement, and harmful inclusions in the molten steel are reduced.

The invention relates to the technical field of metallurgy, in particular to a production process of ultra-low carbon steel. The production process provided by the invention comprises the steps of converter smelting, LF refining, RH refining and continuous casting, according to the method, oxygen is controlled in the whole process of converter + LF + RH, slag is adjusted by adopting a carburant, and a part of slag agent is added after the converter and in the refining process to adjust the CaO / Al2O3 ratio and the (FeO) content of the steel ladle slag, so that the purpose of reducing the oxidability of the steel ladle slag is achieved, on the basis of ensuring that the molten steel is not recarburized, part of Al deoxidation is replaced by a carbon deoxidation mode, the Al2O3 content in the molten steel is effectively reduced, and the steel ladle slag oxidation resistance is improved. And the cleanliness of the molten steel is further improved, so that the castability of the ultra-low carbon IF steel in continuous casting is improved, and the quality of ultra-low carbon steel is greatly improved.

A brazeable casting aluminum alloy with a high solidus line, the aluminum alloy comprising the following components in percentages by mass: Mn: 1.5-2.5%, Zn: 2.2-3.5%, Fe: 0.5-1.0%, Ni: 1.8-2.5%, Ti: 0.05-0.10%, Zr: 0.2-0.5%, Cr: 0.2-0.35%, Si:≤0.2%, and the balance of aluminum and inevitable impurities. The brazeable casting aluminum alloy material with a high solidus line has the advantages of a high solidus line, good castability, low hot cracking tendency, good mechanical properties, etc., can serve as a brazing aluminum alloy material for direct brazing, and meets the use requirements of the market for brazeable casting aluminum alloys.

The invention relates to a forming process for improving the casting performance of an aluminum-magnesium alloy, which specifically comprises the following steps of: 1, weighing raw materials such as an aluminum ingot and a magnesium ingot according to a proportion, and then cleaning impurities such as oxide skin and oil stain on the surfaces of the raw materials in sequence; 2, the cleaned aluminum ingot and magnesium ingot are heated and smelted through a pretreatment device, and a melt is obtained; thirdly, smelted aluminum-magnesium alloy melt is slowly poured into a mold through a casting ladle or a casting machine, and cooling forming is conducted; fourthly, after the cooled and formed aluminum-magnesium alloy is subjected to heat treatment such as annealing and aging, the aluminum-magnesium alloy is subjected to casting head sawing and polishing; the hot air enters the shell, so that the magnesium ingot at the top of the uppermost supporting plate is conveniently dried, the hot air carrying moisture is discharged from the ventilation holes, the magnesium ingot going to enter the crucible is effectively dried, the situation that air holes appear in the aluminum magnesium alloy due to hydrogen generated by decomposition of water vapor during high-temperature smelting is avoided, and the product quality is guaranteed.

The invention relates to the field of steel smelting, and discloses a smelting method of low-carbon, low-manganese, low-sulfur and low-phosphorus steel. Comprising the following steps: S1, molten iron pretreatment; s2, primary slagging in a converter; s3, secondary slagging of the converter; s4, converter end point control; s5, converter tapping and steel ladle slag charge adding; s6, LF slagging; s7, molten steel slagging-off; s8, LF heating is conducted; and S9, RH vacuum treatment is conducted. According to the method, a mode of pre-adding slag charge during tapping, stirring for demanganization after LF mild temperature compensation, dephosphorization, slagging-off and LF temperature rising is adopted, the manganese return amount and the phosphorus return amount are small, the top slag oxidability is weak, the continuous casting castability is high, and the steel defect is remarkably reduced.

The application discloses a process control method for producing rare earth steel, which comprises the following steps: 1) using rare earth functional refractory material to solve the problems of rare earth burning loss, rare earth yield fluctuation and continuous casting flow control failure caused by the corrosion of rare earth elements in the steel to functional refractory materials such as continuous casting nozzle and stopper during the rare earth steel pouring process; 2) using the non-uniform pulse electric field technology in the continuous casting process to improve the castability of the rare earth molten steel; and using the crystallizer wire feeding method to add rare earth alloy, so as to improve the sulfide form, distribution and size in the casting blank, and improve the low-temperature impact toughness, transverse toughness and high-temperature plasticity of the steel. The application aims to provide a process control method for producing rare earth steel, based on the effective identification of the existing research results of the rare earth steel, the stable control of the rare earth steel production process parameters is realized through the systematic rare earth steel process control technology, and the stable and controllable performance difference of the rare earth steel product is realized.

The present invention discloses a method for predicting the molten steel temperature in a VD furnace. The method includes constructing a prediction model for the temperature of the VD ladle: VD ladle temperature = liquidus temperature + temperature drop from the VD ladle to the tundish + tundish superheat; constructing a prediction model for the temperature when entering the VD furnace: VD furnace inlet temperature = VD ladle temperature + soft blowing temperature drop + vacuum temperature drop. The soft blowing temperature drop includes T 软吹温降* soft blowing time t1, and the vacuum temperature drop includes T 真空温降* vacuum time t2. Taking the production rhythm of the continuous caster as the center, the time sequence of each heat in each process of the VD furnace is deduced backwards. Based on the time sequence, and determined according to the steel type, heat number, large and small repair ladles, the temperature drop of the ladle is calculated to obtain the prediction model for the VD ladle temperature and the prediction model for the VD furnace inlet temperature of each heat, and the process control temperature that converts the time flow into the temperature flow is generated, solving the problem that the ladle transfer temperature is not associated with the production rhythm, and the improper control of the molten steel temperature caused by errors in the manual estimation process, ensuring the castability of the molten steel in the continuous caster and the smooth progress of casting the steel billet in the continuous caster.

The invention provides an aluminum casting alloy which has the potential for an optimized combination of high mechanical properties and high electric conductivity and which has a high castability as well. The aluminum casting alloy includes (in % by mass), Ce: 0.2-3.0%, Si: 0.5-1.5%, Fe: 0.1-1.2%, Mg: 0.2-1.0%, optionally one or more elements taken from the group “Zn, Sr” the content of the respective optional element being, Zn: 0.8%, Sr: 0.1%, the remainder being Al and unavoidable impurities, said impurities optionally including elements from the group “Ti, Cr, Mn, V” the content of which is restricted in sum to less than 0.025%. The invention also provides an aluminum cast component which has an optimized combination of high mechanical properties and high electric conductivity and a method which allows the reliable production of such aluminum components from an aluminum alloy according to the invention.

The invention discloses a method for producing deformed steel bars at a high pulling speed by an R8 billet continuous casting machine, and relates to the technical field of steel production. The element composition of the deformed steel bar does not contain Ti element, so that compared with the molten steel added with Ti element, the molten steel has better flowability, better castability in the continuous casting process and small liquid level fluctuation of a crystallizer, even if the pulling speed is increased and the productivity is improved, the problem of corner cracking of a continuous casting billet is not easily caused, and the performance of the deformed steel bar is not obviously reduced after no Ti element is added; and various properties of the prepared deformed steel bar meet the requirements. Furthermore, in the continuous casting process of the deformed steel bar, the pulling speed of a continuous casting billet is controlled to be 2.5-4 m / min, and the specific water flow is 1.4-1.9 L / kg, so that the quality of the continuous casting billet is guaranteed, and accidents such as bleed-out or central hole shrinkage are prevented. According to the method, the qualified continuous casting billet with stable quality can be obtained at a high pulling speed, and the production capacity of the deformed steel bar is remarkably improved.

A hot rolled, ultra-high strength, complex metallographic structured or multi-phase structured steel that improves formability during stamping or forming process, while possessing one or more of the following properties: excellent castability, rollability and coatability, excellent structural performance, excellent stretch formability, excellent stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance, excellent intrusion and crash resistance without the purposeful addition of boron.

The present invention discloses a heat-treatable-free die-casting aluminum alloy and its preparation method and application. The die-casting aluminum alloy is composed of the following components by mass percentage: 10-13% Si, 0.05-0.15% Mg, 0.35-0.65% Fe, 0.2-0.45% Mn, 0.16-0.32% trace elements, and the balance is impurity elements and Al; the trace elements include the following components by mass percentage: 0.08-0.15% Zr, 0.012-0.03% Sr, 0.02-0.09% RE, 0-0.05% Ti, and the Sr and RE are added in the form of an Al-Sr-RE master alloy; the sum of the mass percentages of Mn and Fe is 0.75-0.9%. Based on the Al-Si alloy, the present invention finally obtains a heat-treatable-free die-casting aluminum alloy with both castability and high strength and toughness by adjusting the contents of various components.

This invention discloses a process for smelting high-phosphorus weathering steel through decarburization and phosphorus retention. The process involves using a decarburization converter to decarburize blast furnace hot metal to obtain semi-steel, which is then tapped to a ladle at 1330–1420°C and slag removed. The semi-steel undergoes deep decarburization and reduction in an AOD converter, with alloying elements added according to the steel grade composition. The alloyed steel is then transported to an LF furnace for refining, where alloys are added to fine-tune the composition according to the steel grade's chemical requirements. Finally, the refined steel is transported to a continuous casting platform for casting, yielding high-phosphorus weathering steel slabs. This invention utilizes a decarburization converter without adding any alkaline slag-forming agents, achieving efficient decarburization and phosphorus retention to obtain semi-steel with a phosphorus content close to that of the original hot metal, resulting in low smelting costs. The semi-steel's entry into the AOD converter significantly improves the decarburization and chromium retention conditions, increasing the AOD furnace's production efficiency. The LF furnace's white slag formation, deep desulfurization, temperature increase, and alloy composition fine-tuning ensure the purity and castability of the molten steel, creating favorable conditions for the slab continuous casting process.

The present application relates to the technical field of high-temperature alloy casting, and particularly relates to a mold shell and a method for evaluating the castability of high-temperature alloy. The mold shell for evaluating the castability of high-temperature alloy comprises a runner system and a hot cracking tendency test unit and a filling capacity test unit connected to the runner system respectively; the runner system comprises a sprue, a straight runner, a cross runner, a first pouring plate and a second pouring plate; the hot cracking tendency test unit and the filling capacity test unit each comprise a bottom surface and four side vertical surfaces, and the four side vertical surfaces form a box-like structure without a cover around the bottom surface; and the side vertical surfaces of the hot cracking tendency test unit are provided with feature notches of various shapes. The mold shell for evaluating the castability of high-temperature alloy can ensure that the castability of the alloy, including the hot cracking tendency and the filling capacity, is evaluated simultaneously under the condition that the process conditions are completely consistent.

The invention belongs to the technical field of ferrous metallurgy, and provides a novel method for producing aluminum-containing clean steel through slag washing calcium treatment, which comprises the following steps: promoting a pre-deoxidation reaction by using coke breeze added in the initial stage of converter tapping to realize top slag foaming, and then adding an aluminum block to forcibly remove oxygen in steel; after the molten steel enters an argon station, a proper amount of composite deoxidation slag former and aluminum skimmings are added to the slag surface to remove oxygen in the slag, the effect that argon station refining white slag is preposed is achieved within 4 min after the molten steel enters the station, and the refining effects that the total oxygen content in the molten steel is smaller than or equal to 30 ppm, and the desulfurization rate is larger than 50% are achieved; and finally, a proper amount of calcium is fed in an argon station in reference to the condition of total oxygen content in the steel, solid AL2O3 inclusions in the molten steel are accurately denatured into low-melting-point liquid inclusions such as 12CaO. 7AL2O3, CaO. AL2O3 and 3CaO. AL2O3, and the castability of the molten steel is improved.

The invention belongs to the technical field of metallurgy, and particularly relates to a cleanliness control method for medium-carbon aluminum-containing and sulfur-containing structural steel for an automobile transmission shaft. According to the medium-carbon aluminum-containing sulfur-containing structural steel, the technological process of converter-LF refining furnace-RH vacuum treatment furnace-continuous casting is adopted, the alkalinity of refining slag is controlled by determining the type of deoxidation materials in the converter tapping and LF process, the binary alkalinity of refining final slag is controlled to be 3.5-4.0, and the slag deoxidation and inclusion adsorption capacity is enhanced; in the LF process, through a calcium treatment process, aluminum oxide and other impurities difficult to float upwards are subjected to denaturation treatment, and the situation that a large number of calcium sulfide impurities more difficult to remove are generated due to improper calcium treatment is avoided; in the continuous casting process, nozzle nodulation is controlled through nozzle argon blowing, slow pulling speed and other operations. And finally, the castability of the molten steel is improved, meanwhile, non-metallic inclusions of rolled metal are effectively controlled, the flaw detection qualification rate is increased, and meanwhile the product crack occurrence rate of a user is effectively reduced.

The invention discloses a smelting method of weathering resistant steel SPA-H molten steel, and mainly solves the technical problems that the existing weathering resistant steel SPA-H molten steel is poor in castability, inclusions are difficult to control during smelting by using an argon blowing straight-up process, and the production cost is high. According to the technical scheme, the smelting method of the weathering resistant steel SPA-H molten steel comprises the following steps: (1) desulfurizing molten iron; (2) smelting by adopting a top-bottom combined blowing converter, and adding an alloy required by alloying of a copper element into the converter along with the scrap steel; 3) converter smelting process control; 4) converter smelting end point control; 5) converter tapping control; (6) refining in a molten steel argon blowing station to adjust the temperature of the molten steel to 1580-1595 DEG C; aluminum wires are fed into the molten steel; weak stirring is conducted on the molten steel fed with the aluminum wire, and the molten steel is slightly stirred for 5-6 minutes; and then adding a titanium-iron alloy, and continuing to slightly stir the molten steel for 2-3 minutes to obtain finished molten steel. The molten steel produced by the method is directly conveyed to a continuous casting machine for casting, and the number of continuous casting furnaces is larger than or equal to 12.

The invention belongs to the technical field of steelmaking auxiliary materials, and particularly relates to an S32205 duplex stainless steel functional protection material. The functional protection material comprises the following chemical components in percentage by weight: 29-38% of SiO2, 30-34.50% of CaO, 8-12% of Al2O3, 6.5-9.5% of Na2O, 3-6% of F <->, less than or equal to 1.5% of Fe2O3, 1-3.5% of MgO, less than or equal to 1.5% of MnO, 1-3.5% of free carbon and the balance of trace elements. According to the functional protection material, the process problem caused by poor continuous casting castability of the S32205 duplex stainless steel molten steel can be solved, smooth continuous casting production is guaranteed, meanwhile, the surface and subcutaneous quality of a continuous casting blank is improved, cracks are reduced, and therefore the high rolled material yield is obtained.

The invention relates to a refrigerant runner plate, a cooling device and a manufacturing method of the cooling device. The refrigerant runner plate is made of an aluminum alloy with brand new design, and the aluminum alloy comprises the following chemical components in percentage by weight: 1.6-2.5% of Ni, 0.3-1.5% of Mn, 0.3-1.0% of Zn, 0.3-1.0% of Fe, and the balance of Al, less than or equal to 0.5% of trace elements in percentage by weight and inevitable impurities. The aluminum alloy prepared according to the component proportion has good castability, machinability and weldability. Meanwhile, the aluminum alloy prepared according to the component proportion also has good mechanical properties, especially mechanical properties in an annealing state, so that the aluminum alloy can be suitable for a refrigerant environment with relatively high working pressure after being subjected to vacuum brazing with a corresponding cover plate.

The invention relates to the technical field of alloy material casting, and discloses a heat-treatment-free die-casting alloy material and a preparation method and application thereof, and the heat-treatment-free die-casting alloy material comprises various rare earth elements and aluminum. According to the alloy material, the eutectic reaction of Si, Mg and Al is utilized, so that the alloy has good fluidity and casting formability in the solidification process, by means of the action of high-melting-point transition metal elements Mn, Cr, V, Mo and Zr, grains are refined, the thermal stability of the alloy is improved, the material has good room-temperature performance, meanwhile, the material can serve for a long time at a certain temperature, and the service life of the material is prolonged. The modification and refinement effects of rare earth elements, Ga, In and Al-Ti-B on crystal grains and eutectic structures are comprehensively utilized, the microstructure of the alloy is improved, the material has high strength and plasticity in the die-casting state, subsequent heat treatment is not needed, the procedures of deformation, correction and the like are reduced, the rejection rate is reduced, and the production period is shortened.

The invention discloses a low-cost method for producing variety steel, which is characterized in that the addition amount of silicon iron in refining components is controlled: (1) the addition amount of silicon iron is less than or equal to 100kg, Ca is increased in the process from refining 1 to the refining end point, and (2) the addition amount of silicon iron is increased in the process from refining 1 to the refining end point when the addition amount of silicon iron is more than 100kg; according to the content change of Ca and Al in the ferrosilicon, whether the ferrosilicon is added into the molten steel is changed is judged; a certain amount of silicon iron is added during converter tapping, and the effect of improving the silicon iron recovery rate is achieved; according to the Ca and Al contents at the refining end point of the LF furnace, it is calculated that the calcium content in molten steel needs to be increased to be 12-16 ppm, the calcium content of a finished product is at least larger than or equal to 0.0010%, and smooth casting of continuous casting can be guaranteed. Calculated according to the calcium wire yield, 0.5-0.85 m / t of calcium wire needs to be fed, and the castability of molten steel is promoted.