Low-carbon aluminum killed cold heading steel and production method thereof

A production method and technology of cold heading steel, applied in the field of metallurgy, can solve the problems of high production cost and cold heading performance to be further improved, and achieve the effects of low cracking rate, improved internal quality and stable performance

Active Publication Date: 2021-04-06
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the cold heading performance of the existing cold heading steel needs to be further improved and the production cost is high, the invention provides a low-carbon aluminum-killed cold heading steel and its production method

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  • Low-carbon aluminum killed cold heading steel and production method thereof

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Embodiment 1

[0034] The embodiment of the present invention provides a low-carbon aluminum-killed cold heading steel, the specification is Φ12mm, and its chemical composition is:

[0035] C 0.06%, Mn 0.50%, Si 0.06%, P 0.015%, S 0.010%, Al 0.020%, the balance is Fe and unavoidable impurities.

[0036] The production method of the above-mentioned low-carbon aluminum-killed cold heading steel is as follows:

[0037] Step 1, steelmaking process, component control at the end of the converter, S: 0.020%, P: 0.010%, C: 0.03%, the temperature of tapping into LF is 1590°C, the amount of deoxidizer added is 1.5kg / t; LF refining is carried out with Ca Treatment, Ca / Als=0.11, white slag retention time 16 minutes;

[0038] Step 2, continuous casting process, the superheat of molten steel in the tundish is 30°C, and the continuous casting casting speed is controlled at 1.7m / min;

[0039] Step 3. Heating and rolling process, put the 165×165mm billet into the heating furnace for heating, the heating te...

Embodiment 2

[0043]The embodiment of the present invention provides a low-carbon aluminum-killed cold heading steel, the specification is Φ12mm, and its chemical composition is:

[0044] C 0.09%, Mn 0.50%, Si 0.05%, P 0.013%, S 0.008%, Al 0.040%, the balance is Fe and unavoidable impurities.

[0045] The production method of the above-mentioned low-carbon aluminum-killed cold heading steel is as follows:

[0046] Step 1, steelmaking process, S: 0.018%, P: 0.008%, C: 0.04%, the temperature of tapping into LF is 1610°C, the amount of deoxidizer added is 3.0kg / t; LF refining is carried out with Ca treatment, Ca / Als= 0.12, the retention time of white slag is 20 minutes;

[0047] Step 2, continuous casting process, the superheat of molten steel in the tundish is 50°C, and the continuous casting casting speed is controlled at 1.9m / min;

[0048] Step 3. Heating and rolling process, put the 165×165mm billet into the heating furnace for heating, the heating temperature is 1025°C, the temperature ...

Embodiment 3

[0052] The embodiment of the present invention provides a low-carbon aluminum-killed cold heading steel, the specification is Φ12mm, and its chemical composition is:

[0053] C 0.07%, Mn 0.40%, Si 0.04%, P 0.012%, S 0.008%, Al 0.030%, the balance is Fe and unavoidable impurities.

[0054] The production method of the above-mentioned low-carbon aluminum-killed cold heading steel is as follows:

[0055] Step 1, steelmaking process, converter end point composition control, S: 0.017%, P: 0.007%, C: 0.035%, the temperature of tapping into LF is 1600°C, the amount of deoxidizer added is 2.0kg / t; LF refining is carried out with Ca Treatment, Ca / Als=0.13, white slag retention time 18 minutes;

[0056] Step 2, continuous casting process, the superheat of molten steel in the tundish is 40°C, and the continuous casting casting speed is controlled at 1.8m / min;

[0057] Step 3: heating and rolling process, put the 165×165mm billet into the heating furnace for heating, the heating tempera...

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Abstract

The invention relates to the technical field of metallurgy, and particularly discloses low-carbon aluminum killed cold heading steel and a production method thereof. Components of the cold heading steel comprise 0.06-0.09% of C, 0.30-0.50% of Mn, 0.03-0.06% of Si, not larger than 0.015% of P, not larger than 0.010% of S, 0.020-0.040% of Al and the balance Fe and inevitable impurities. The low-carbon aluminum killed cold heading steel is prepared through the procedures of steelmaking, continuous casting, heating rolling and spinning. Through component adjustment and process optimization, the mechanical property of the prepared cold heading steel meets the conditions that the tensile strength Rm is smaller than or equal to 450 N/mm < 2 > and the shrinkage rate Z is larger than or equal to 70%, the produced cold heading steel completely meets the use requirement, the mechanical property is stable, and large-scale application and popularization can be achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a low-carbon aluminum-killed cold heading steel and a production method thereof. Background technique [0002] Cold heading steel is a room-temperature forming steel that can withstand one or more impact loads at room temperature. It is widely used in the production of standard parts such as screws, pins, and nuts. It is mainly used in automobiles, engineering construction, machinery, electronics, and light steel structures. , construction and other industries. With the rapid development of modern industry, the performance requirements of cold heading steel are getting higher and higher. At the same time, cold working will cause significant local deformation of the material. Excellent plasticity, good surface quality and uniform structure and other properties. In order to improve the plasticity of the steel, the silicon content in the steel is limited. In order to improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C33/04C21C7/06B21B37/74
CPCC22C38/04C22C38/02C22C38/06C22C33/04C21C7/06B21B37/74C21D2211/005C21D2211/009
Inventor 张剑王宝华王屹梁东宏芮文超肖元生
Owner HEBEI IRON AND STEEL
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