阅读说明：本技术 一种提高低硅含铝冷镦钢炼成率的生产方法 (Production method for improving low-silicon aluminum-containing cold heading steel smelting yield ) 是由 赵晓敏 吕刚 白月琴 惠治国 杨鲁明 于 2021-08-05 设计创作，主要内容包括：本发明公开了本发明是提供一种提高低硅含铝冷镦钢炼成率的生产方法,重点是通过多轮次跟踪试验确定影响低硅含铝冷镦钢炼成率的重要因素,寻找工艺控制关键点,固化低硅含铝钢操作工艺流程,优化工艺参数,实施技术攻关提高低硅含铝冷镦钢的一次炼成率。(The invention discloses a production method for improving the smelting rate of low-silicon aluminum-containing cold forging steel, which is characterized by determining important factors influencing the smelting rate of the low-silicon aluminum-containing cold forging steel through a plurality of rounds of tracking tests, searching process control key points, solidifying the operation process flow of the low-silicon aluminum-containing steel, optimizing process parameters, and implementing technical challenges to improve the one-time smelting rate of the low-silicon aluminum-containing cold forging steel.)

1. The production method for improving the smelting yield of the low-silicon aluminum-containing cold heading steel is characterized by comprising the following steps of:

1) the key raw and auxiliary materials require:

bauxite: granularity: 5-20mm, less than 5mm should not exceed 5%, more than 20mm should not exceed 5%. More than or equal to 80 percent of Al2O3, less than or equal to 2.5 percent of Fe2O3 and less than or equal to 5.0 percent of SiO 2; if the bauxite does not meet the requirements, using the refining slag, wherein the CaO is calculated in the refining slag according to the mass percentage: 55 percent; al (Al)₂O₃: 33%; tundish covering agent: SiO2₂Not more than 5.0 percent and R is not less than 5; the Si% in the alloy is required to be less than or equal to 1.50%;

2) the control requirements of the converter are as follows:

the molten iron is ensured to adopt the production process of the whole torpedo, and iron waiting is avoided; the strict and stable loading amount is 103 +/-3 tons, the waste steel adopts 5 tons of pure waste steel, and the tapping amount is controlled to be 95 tons so as to facilitate the treatment of stable in-place components and refining; the bottom blowing control adopts an automatic control mode, and the time for completely replacing argon by bottom blowing in the later stage of converting is more than 5 minutes; the steel is prevented from being oxidized and tapped, and the high-tension complementary blowing operation is adopted, wherein C is more than or equal to 0.10% and less than or equal to 0.25%; the final spotting is required to be taken after spot blowing; if the steel is peroxidized and tapped, a deoxidizing agent needs to be added; the tapping temperature of the converter is required to be more than 1630 ℃, and if the time sequence is tight, the tapping temperature can be properly improved to create good conditions for the refining furnace; carrying out oxygen determination operation before tapping, adjusting the adding amount of the aluminum blocks according to the oxygen content, and ensuring the Al range in place for refining: al is more than or equal to 0.050% and less than or equal to 0.070%; the ladle argon blowing device is checked before tapping, so that the double-line argon blowing of the ladle is ensured to be good; when the molten steel amount in the ladle is 30t, electrode particles are properly added according to the end point carbon content, and then alloy and top slag are sequentially added: alloy → bauxite or refining slag → lime; slag stopping is required in the whole process, and slag discharging is not allowed; the LF steel pressing time is not more than 10 minutes;

3) refining control requirements:

adjusting the flow of argon gas, and controlling the diameter of the blow-off area to be about 300-400 mm; if the top slag is molten, performing oxygen determination operation; if the oxygen value is more than or equal to 2.5ppm, a deoxidizing agent must be scattered immediately, and the oxygen return in the treatment process is controlled; if the top slag is well melted, high-grade heating is adopted; adding small ash and bauxite or refining slag and small ash during heating; adding 30kg of calcium carbide in the heating process, heating for 5 minutes, then powering off to perform white slag making operation, simultaneously measuring the temperature and sampling, scattering a deoxidizing agent on the surface of the slag according to the conditions of fixed oxygen and slag, dipping a sample after the next heating is stopped, observing the color of the slag, if the slag becomes white or grey, determining that the white slag is made good, and otherwise, continuously scattering the deoxidizing agent; the deoxidation operation is carried out again to meet the requirements; the adding amount of the alloy is adjusted according to the requirement of internal control components, and the heating time in the whole refining process is not less than 10 minutes; before calcium treatment, temperature measurement and oxygen determination are carried out, the oxygen content is controlled to be below 5ppm, otherwise, the refining time is prolonged; the whole refining process ensures that the atmosphere in the ladle is a reducing atmosphere, and the heating process slightly smokes; if the sampling sulfur is high, the lime amount is increased in the heating process; molten steel calcium treatment: the refining off-site Al target is controlled to be between 0.040 and 0.060 percent, and the Ca target is controlled to be between 0.003 and 0.0045 percent; the Al of the first furnace is controlled to be more than 0.07 percent, and the Ca is controlled to be 0.004 to 0.006 percent; after calcium treatment, secondary heating is carried out for other reasons, wire feeding soft blowing operation needs to be carried out again, and the wire feeding amount is controlled to be 50-120m according to the heating time; the soft blowing time is more than 15min, and no naked molten steel can be obtained in the soft blowing process;

4) and (3) continuous casting control requirements:

the secondary oxidation can cause Al loss increase and flocculation flow, and the secondary oxidation of the molten steel on a continuous casting machine is avoided; the inner wall coating of the crystallizer is not allowed to fall off when the crystallizer with the steel passing amount less than 5000t is used; baking the tundish to be more than 1000 ℃; the submerged nozzle is used after being baked, and the ladle long nozzle is preheated and dried along with baking of the tundish; six submerged nozzles of the tundish are necessarily aligned and centered with the upper opening of the crystallizer, the deviation is less than or equal to 5mm, and the tundish is protected by a sealing gasket; the ladle long nozzle adopts argon sealing protection pouring, and the ladle does not expose the tapping liquid surface; the output rollers of the zero section and other two cooling sections of the two-stage cooling water system always work normally; the gas spray nozzles and the water spray nozzles of all the sections are smooth for sure, so that all the surfaces of the casting blank are uniformly cooled; the pulling speed is started to be 0.5m/min, the pulling speed is adjusted to be 0.1m/min every 30 seconds, and slag entrapment caused by too fast pulling speed adjustment is avoided; the large ladle is strictly forbidden to slag, and the large ladle residual steel operation is executed; the vibration is carried out at 190 HZ/min, the amplitude is +/-4 mm, and the negative slip time is ensured to be 0.1 s; the thickness of the powder slag layer of the protective slag is controlled between 25 and 30 mm; except for the first casting furnace, the normal degree of superheat is more than 50 ℃, and the casting blank must be picked out to fall behind and sampled in an encrypted manner; the liquid level fluctuation is more than 5mm, and the casting blanks must be picked out and fall behind; the constant pulling speed is 2.1m/min, the pulling speed fluctuates +/-0.2 m/min under special conditions, the casting blank which is not in the secondary pulling speed range must fall behind, and the casting blank with the pulling speed exceeding 2.4m/min is judged to be waste; if the flocculation flow appears in the whole furnace, the whole furnace is stacked; picking out the casting blanks without the dispersed floc flow and falling behind; in the normal steel pouring process, a water gap is changed, and a joint mark casting blank generated by the water gap is required to be completely cut; casting blanks produced when the continuous casting tundish molten steel is less than 12 tons are picked out uniformly and fall behind; the casting blanks produced when the liquid level of the crystallizer is automatically controlled and the electromagnetic stirring is abnormal are uniformly picked out and fall behind.

Technical Field

The invention relates to the field of sports equipment, in particular to a production method for improving the smelting yield of low-silicon aluminum-containing cold heading steel.

Background

The low-silicon aluminum-containing cold forging steel is influenced by the factors of raw and auxiliary materials, smelting equipment conditions, unstable aluminum for refining in place by a converter, white slag not produced according to the refining specification, low Ca/Al in molten steel, flocculation flow of slag discharging, P returning, Si returning and the like during the tapping of the converter, improper components and the like, so that the cold forging steel has low refining rate and the material consumption cost is increased. The cold heading steel yield of a steel mill in one year is counted, and the average rejection rate of ML08Al quarterly is 15.17%, the average rejection rate of SWRCH22A quarterly is 14.23%, and the rejection rate is nearly 2-3 times higher than that of steel of other varieties, as shown in the attached table. In the face of competition of metallurgical industry, various large steel mills propose projects of reducing production cost and improving production efficiency, and the steel mills always insist on a production policy of taking the quality of the low-silicon aluminum-containing steel as a creative effect support to be fixed, and insist on carrying out effective and fixed marketing to sell and fixed production, and through continuously solidifying the operation process flow of the low-silicon aluminum-containing steel, optimizing process parameters and implementing technical attack, the smelting rate of the low-silicon aluminum-containing cold forging steel variety steel is improved, so that the material cost is reduced, and the profit space of the variety steel is improved.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a production method for improving the smelting rate of low-silicon aluminum-containing cold forging steel, optimize process parameters and implement technical key to improve the primary smelting rate of the low-silicon aluminum-containing cold forging steel.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention relates to a production method for improving the smelting yield of low-silicon aluminum-containing cold heading steel, which comprises the following steps

1) The key raw and auxiliary materials require:

(1) bauxite: granularity: 5-20mm, less than 5mm should not exceed 5%, more than 20mm should not exceed 5%. More than or equal to 80 percent of Al2O3, less than or equal to 2.5 percent of Fe2O3 and less than or equal to 5.0 percent of SiO 2. (2) If bauxite can not meet the requirement, refining slag is recommended. The CaO is required to be: 55 percent; al2O 3: 33 percent. (3) Tundish covering agent: SiO2 is less than or equal to 5.0 percent, and R is more than or equal to 5 percent. (4) The Si content in the alloy is required to be less than or equal to 1.50 percent.

2) The control requirements of the converter are as follows:

the molten iron is ensured to adopt the production process of the whole torpedo, and iron waiting is avoided. The strict and stable loading amount is 103 +/-3 tons, the waste steel adopts 5 tons of pure waste steel, and the tapping amount is ensured to be controlled at 95 tons so as to be convenient for the treatment of stable in-place components and refining. The bottom blowing control adopts an automatic control mode, and the time for completely replacing argon gas by bottom blowing in the later stage of converting is more than 5 minutes. The steel is prevented from being oxidized and tapped, and the high-tension complementary blowing operation is adopted, wherein C is more than or equal to 0.10% and less than or equal to 0.25%; the final spotting is required to be taken after spot blowing; if the steel is over oxidized, the deoxidizer is needed to be added. The tapping temperature of the converter is required to be more than 1630 ℃, and if the time sequence is tight, the tapping temperature can be properly improved to create good conditions for the refining furnace. Carrying out oxygen determination operation before tapping, adjusting the adding amount of the aluminum blocks according to the oxygen content, and ensuring the Al range in place for refining: al is between 0.050% and 0.070%. And the ladle argon blowing device is checked before tapping, so that the double-line argon blowing of the ladle is ensured to be good. When the molten steel in the ladle is about 30t, electrode particles are properly added according to the end point carbon content, and then alloy and top slag are sequentially added: alloy → bauxite (refining slag) → lime. Slag stopping is required in the whole process, and slag discharging is not allowed. The time for LF steel pressing is not more than 10 minutes.

3) Refining control requirements:

adjusting the flow of argon gas, and controlling the diameter of the blow-off area to be about 300-400 mm. If the top slag is molten, the oxygen determination operation can be carried out. If the oxygen value is not less than 2.5ppm, deoxidizing agents such as calcium powder and aluminum particles must be scattered immediately to control the oxygen return in the treatment process. If the top slag is well melted, high-grade heating is adopted; adding small ash blocks and bauxite or refining slag and small ash blocks during heating. Adding 30kg of calcium carbide in the heating process, heating for 5 minutes, cutting off the power to perform white slag making operation, simultaneously measuring the temperature and sampling, scattering a deoxidizing agent on the surface of the slag according to the conditions of fixed oxygen and slag, dipping the sample after the next heating is stopped, observing the color of the slag, if the slag becomes white or grey, determining that the white slag is made, and otherwise, continuously scattering the deoxidizing agent. The re-deoxidation operation performs the above requirements. The adding amount of the alloy is adjusted according to the requirement of internal control components, and the heating time in the whole refining process is not less than 10 minutes. Before calcium treatment, temperature measurement and oxygen determination are carried out, the oxygen content is controlled below 5ppm, otherwise, the refining time is prolonged. The whole refining process ensures that the atmosphere in the ladle is a reducing atmosphere, and the heating process slightly smokes. If the sample sulfur is high, the amount of lime can be increased during heating. Molten steel calcium treatment: the refining off-site Al target is controlled between 0.040% -0.060%, and the Ca target is controlled between 0.003% -0.0045%. The Al content of the first furnace is controlled to be more than 0.07 percent, and the Ca content is controlled to be 0.004 to 0.006 percent. After calcium treatment, secondary heating is carried out for other reasons, wire feeding soft blowing operation is carried out again, and the wire feeding amount is controlled to be 50-120m according to the heating time. The soft blowing time is more than 15min, and the bare molten steel cannot be obtained in the soft blowing process.

4) And (3) continuous casting control requirements:

the secondary oxidation can cause the conditions of Al loss increase, flocculation flow and the like, and the secondary oxidation of the molten steel on a continuous casting machine is required to be avoided. When the crystallizer with the steel excess less than 5000t is used, the coating on the inner wall of the crystallizer does not fall off. The tundish baking is more than 1000 ℃. The submerged nozzle is used after being baked (more than 600 ℃), and the ladle long nozzle is preheated and dried along with baking of the tundish. Six submerged nozzles of the tundish are necessarily aligned and centered with the upper opening of the crystallizer, the deviation is less than or equal to 5mm, and the tundish is protected by a sealing gasket. The ladle long nozzle adopts argon seal protection pouring (argon pressure is 0.20-0.30 MPa, flow is 50-80NL/min), and the ladle does not expose the tapping liquid surface. The output rollers of the zero section and other two cooling sections of the two-stage cooling water system always work normally; the gas spray nozzles and the water nozzles of all the sections are smooth, so that the uniform cooling of all the surfaces of the casting blank is ensured. The pulling speed is 0.5m/min when starting, the pulling speed is adjusted by 0.1m/min every 30 seconds, and the slag is prevented from being rolled up due to the fact that the pulling speed is adjusted too fast. And (5) strictly avoiding slagging in the ladle, and executing the ladle residual steel operation. The vibration was performed at 190 HZ/min with an amplitude of 4mm, which must ensure a negative slip time of 0.1 s. The thickness of the powder slag layer of the protective slag is controlled between 25 mm and 30 mm. Except for the first furnace, the normal degree of superheat is more than 50 ℃, and the casting blank must be picked out, fallen behind and sampled in an encrypted manner. The liquid level fluctuation is more than 5mm of heat, and the casting blank must be picked out and fall behind. The constant pulling speed is 2.1m/min, the pulling speed fluctuates +/-0.2 m/min under special conditions, the casting blanks which are not in the secondary pulling speed range must fall behind, and the casting blanks with the pulling speed exceeding 2.4m/min are judged to be waste. If the flocculation flow appears in the whole furnace, the whole furnace is stacked; casting blanks with zero dispersed floc flow are picked out and fall behind. In the normal steel pouring process, the water gap is changed, and the joint mark casting blank generated by the water gap is required to be completely cut. Casting blanks produced when the continuous casting tundish molten steel is less than 12 tons are uniformly picked out and fall behind. Casting blanks produced when abnormality occurs such as automatic control of crystallizer liquid level, electromagnetic stirring and the like are uniformly picked out and fall behind

Compared with the prior art, the invention has the beneficial technical effects that:

after the technological parameters are accurately controlled according to the method, the one-time refining rate of the low-silicon aluminum-containing cold forging steel is obviously improved, the scrap steel ratio is reduced by 11.2%, and the production cost of a steel mill is saved.

Detailed Description

The invention provides a production method for improving the smelting rate of low-silicon aluminum-containing cold forging steel, which is characterized by determining important factors influencing the smelting rate of the low-silicon aluminum-containing cold forging steel through a plurality of rounds of tracking tests, searching process control key points, solidifying the operation process flow of the low-silicon aluminum-containing steel, optimizing process parameters, and implementing technical attack to improve the one-time smelting rate of the low-silicon aluminum-containing cold forging steel.

The invention relates to low-carbon, low-silicon and aluminum-containing cold forging steel, which comprises the following chemical components in percentage by mass: c: 0.03-0.45%; si: less than or equal to 0.20 percent; mn: 0.50-1.00%; p, S: less than or equal to 0.035%; al: not less than 0.02%, and the balance of Fe and a small amount of impurity elements. The method mainly solves the problems of Si and Al content control in the process, flocculation prevention and the like in smelting production of low-silicon aluminum-containing cold forging steel, has more factors influencing the Si content in the process, and determines key processes influencing the final Si content through carding analysis. The method mainly comprises the following steps: (1) the high Si content in the raw and auxiliary materials and the deoxidizer is an important reason for the high Si content of the final molten steel, and particularly the use amount of the deoxidizer is large; (2) when the low-silicon aluminum-containing cold forging steel is produced, the silicon content in the molten steel is increased due to the alternate use of the steel ladles; (3) the converter slag tapping causes difficulty in refining and smelting, so that the refining processing time is increased to influence the production time sequence, and the Si component cannot be ensured; (4) when cold forging steel is smelted, a refining off-position slag system must be clear. The proper refining off-position slag system is beneficial to floating of the inclusion and reducing flocculation. In-situ refining of Al is unstable, which can result in aluminum iron supplementation or intentional aluminum stirring during the refining process. This case may result in poor effect of the soft blowing for a long time of the refining treatment. (5) The molten steel is on a continuous casting machine, and the secondary oxidation of the molten steel is mainly avoided. Secondary oxidation can lead to increased Al loss and flocculation. When the crystallizer with the steel excess less than 5000t is used, the coating on the inner wall of the crystallizer does not fall off.

A production method for improving the smelting rate of low-silicon aluminum-containing cold forging steel is characterized by improving the one-time smelting rate of the low-silicon aluminum-containing cold forging steel. In order to achieve the above purpose, the invention adopts the following technical scheme:

1. the key raw and auxiliary materials require:

(1) bauxite: granularity: 5-20mm, less than 5mm should not exceed 5%, more than 20mm should not exceed 5%. More than or equal to 80 percent of Al2O3, less than or equal to 2.5 percent of Fe2O3 and less than or equal to 5.0 percent of SiO 2. (2) If bauxite can not meet the requirement, refining slag is recommended. The CaO is required to be: 55 percent; al2O 3: 33 percent. (3) Tundish covering agent: SiO2 is less than or equal to 5.0 percent, and R is more than or equal to 5 percent. (4) The Si content in the alloy is required to be less than or equal to 1.50 percent.

2. The control requirements of the converter are as follows:

the molten iron is ensured to adopt the production process of the whole torpedo, and iron waiting is avoided. The strict and stable loading amount is 103 +/-3 tons, the waste steel adopts 5 tons of pure waste steel, and the tapping amount is ensured to be controlled at 95 tons so as to be convenient for the treatment of stable in-place components and refining. The bottom blowing control adopts an automatic control mode, and the time for completely replacing argon gas by bottom blowing in the later stage of converting is more than 5 minutes. The steel is prevented from being oxidized and tapped, and the high-tension complementary blowing operation is adopted, wherein C is more than or equal to 0.10% and less than or equal to 0.25%; the final spotting is required to be taken after spot blowing; if the steel is over oxidized, the deoxidizer is needed to be added. The tapping temperature of the converter is required to be more than 1630 ℃, and if the time sequence is tight, the tapping temperature can be properly improved to create good conditions for the refining furnace. Carrying out oxygen determination operation before tapping, adjusting the adding amount of the aluminum blocks according to the oxygen content, and ensuring the Al range in place for refining: al is between 0.050% and 0.070%. And the ladle argon blowing device is checked before tapping, so that the double-line argon blowing of the ladle is ensured to be good. When the molten steel in the ladle is about 30t, electrode particles are properly added according to the end point carbon content, and then alloy and top slag are sequentially added: alloy → bauxite (refining slag) → lime. Slag stopping is required in the whole process, and slag discharging is not allowed. The time for LF steel pressing is not more than 10 minutes.

3. Refining control requirements:

adjusting the flow of argon gas, and controlling the diameter of the blow-off area to be about 300-400 mm. If the top slag is molten, the oxygen determination operation can be carried out. If the oxygen value is not less than 2.5ppm, deoxidizing agents such as calcium powder and aluminum particles must be scattered immediately to control the oxygen return in the treatment process. If the top slag is well melted, high-grade heating is adopted; adding small ash blocks and bauxite or refining slag and small ash blocks during heating. Adding 30kg of calcium carbide in the heating process, heating for 5 minutes, cutting off the power to perform white slag making operation, simultaneously measuring the temperature and sampling, scattering a deoxidizing agent on the surface of the slag according to the conditions of fixed oxygen and slag, dipping the sample after the next heating is stopped, observing the color of the slag, if the slag becomes white or grey, determining that the white slag is made, and otherwise, continuously scattering the deoxidizing agent. The re-deoxidation operation performs the above requirements. The adding amount of the alloy is adjusted according to the requirement of internal control components, and the heating time in the whole refining process is not less than 10 minutes. Before calcium treatment, temperature measurement and oxygen determination are carried out, the oxygen content is controlled below 5ppm, otherwise, the refining time is prolonged. The whole refining process ensures that the atmosphere in the ladle is a reducing atmosphere, and the heating process slightly smokes. If the sample sulfur is high, the amount of lime can be increased during heating. Molten steel calcium treatment: the refining off-site Al target is controlled between 0.040% -0.060%, and the Ca target is controlled between 0.003% -0.0045%. The Al content of the first furnace is controlled to be more than 0.07 percent, and the Ca content is controlled to be 0.004 to 0.006 percent. After calcium treatment, secondary heating is carried out for other reasons, wire feeding soft blowing operation is carried out again, and the wire feeding amount is controlled to be 50-120m according to the heating time. The soft blowing time is more than 15min, and the bare molten steel cannot be obtained in the soft blowing process.

4. And (3) continuous casting control requirements:

the secondary oxidation can cause the conditions of Al loss increase, flocculation flow and the like, and the secondary oxidation of the molten steel on a continuous casting machine is required to be avoided. When the crystallizer with the steel excess less than 5000t is used, the coating on the inner wall of the crystallizer does not fall off. The tundish baking is more than 1000 ℃. The submerged nozzle is used after being baked (more than 600 ℃), and the ladle long nozzle is preheated and dried along with baking of the tundish. Six submerged nozzles of the tundish are necessarily aligned and centered with the upper opening of the crystallizer, the deviation is less than or equal to 5mm, and the tundish is protected by a sealing gasket. The ladle long nozzle adopts argon seal protection pouring (argon pressure is 0.20-0.30 MPa, flow is 50-80NL/min), and the ladle does not expose the tapping liquid surface. The output rollers of the zero section and other two cooling sections of the two-stage cooling water system always work normally; the gas spray nozzles and the water nozzles of all the sections are smooth, so that the uniform cooling of all the surfaces of the casting blank is ensured. The pulling speed is 0.5m/min when starting, the pulling speed is adjusted by 0.1m/min every 30 seconds, and the slag is prevented from being rolled up due to the fact that the pulling speed is adjusted too fast. And (5) strictly avoiding slagging in the ladle, and executing the ladle residual steel operation. The vibration was performed at 190 HZ/min with an amplitude of 4mm, which must ensure a negative slip time of 0.1 s. The thickness of the powder slag layer of the protective slag is controlled between 25 mm and 30 mm. Except for the first furnace, the normal degree of superheat is more than 50 ℃, and the casting blank must be picked out, fallen behind and sampled in an encrypted manner. The liquid level fluctuation is more than 5mm of heat, and the casting blank must be picked out and fall behind. The constant pulling speed is 2.1m/min, the pulling speed fluctuates +/-0.2 m/min under special conditions, the casting blanks which are not in the secondary pulling speed range must fall behind, and the casting blanks with the pulling speed exceeding 2.4m/min are judged to be waste. If the flocculation flow appears in the whole furnace, the whole furnace is stacked; casting blanks with zero dispersed floc flow are picked out and fall behind. In the normal steel pouring process, the water gap is changed, and the joint mark casting blank generated by the water gap is required to be completely cut. Casting blanks produced when the continuous casting tundish molten steel is less than 12 tons are uniformly picked out and fall behind. Casting blanks produced when abnormality occurs such as automatic control of crystallizer liquid level, electromagnetic stirring and the like are picked out uniformly and fall behind.

After the precise control is carried out according to the process parameters, the one-time refining rate of the low-silicon aluminum-containing cold forging steel is obviously improved, the scrap steel rate is reduced by 11.2 percent, and the production cost of a steel mill is saved. According to the calculation of 100000 tons of annual low-silicon aluminum-containing cold forging steel, the yield of scrap steel is reduced: the steel billet manufacturing cost is calculated according to 2617.825 yuan/ton, the production cost is reduced by 537.83 yuan/ton, and 602 ten thousand yuan can be saved every year.

Attached table:

the above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.