A kind of low-carbon aluminum killed cold heading steel and production method thereof

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

Inactive Publication Date: 2022-03-15
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of low-carbon aluminum killed cold heading steel and production method thereof

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Embodiment 1

[0034] Embodiment of the present invention provides a low carbon aluminum killed steel, cold heading, specifications for a 12 mm diameter, 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 being Fe and unavoidable impurities.

[0036] The above-described method of producing low carbon aluminum killed cold-forged steel is as follows:

[0037] Step one, the steelmaking process, converter control end component, S: 0.020%, P: 0.010%, C: 0.03%, the steel into the LF temperature was 1590 deg.] C, is added in an amount of deoxidizing agent 1.5kg / t; LF refining for Ca processing, Ca / Als = 0.11, white residue 16 minutes retention time;

[0038] Step two, casting process, superheat Tundish 30 ℃, controlling casting speed 1.7m / min;

[0039] Step three, the heating step of the rolling, the billet was charged 165 × 165mm heating furnace and heated, a heating temperature of 1010 deg.] C, a temperature difference billets head, mid...

Embodiment 2

[0043]Embodiments of the present invention provide a low carbon-aluminum sedation of calm-cooling steel, a specifications of 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%, and the margin is Fe and inevitable impurities.

[0045] The production method of the above-mentioned low carbon-aluminum sedation is as follows:

[0046] Step 1, Steelmaking Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel Steel, 0.018%, P: 0.008%, C: 0.04%, the steel in the LF temperature of 1610 ° C, the dosage added is 3.0 kg / t; LF refining, CA / ALS = 0.12, white slag hold time 20 minutes;

[0047] Step two, the continuous casting process, the middle package steel water is 50 ° C, and the coil speed is controlled by 1.9 m / min;

[0048] Step three, heat the rolling step, load 165 × 165mm square billet into the heating furnace for heating, heat the temperature of 1025 ° C, continuous casting square blank head, central and...

Embodiment 3

[0052] Embodiments of the present invention provide a low carbon-aluminum sedation of calm-cooling steel, a specifications of 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%, and the margin is Fe and inevitable impurities.

[0054] The production method of the above-mentioned low carbon-aluminum sedation is as follows:

[0055] Steps, Steelmaking Steel Steel Steel Steel Steel, S: 0.017%, P: 0.007%, C: 0.035%, and the steel in the steel is 1600 ° C, the deoxidizer is added to 2.0kg / t; LF refinery CA Treatment, CA / ALS = 0.13, white slag hold time 18 minutes;

[0056] Step 2, the continuous casting process, the intermediate package steel is overheating 40 ° C, and the continuous cast pulsat is 1.8 m / min;

[0057] Step three, heat the rolling step, the 165 × 165mm square billet is loaded into the heating furnace for heating, the heating temperature is 1020 ° C, and the temperature of the casting member blank, the temper...

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Abstract

The invention relates to the technical field of metallurgy, and specifically discloses a low-carbon aluminum-killed cold heading steel and a production method thereof. The composition of the cold heading steel is: C 0.06~0.09%, Mn 0.30~0.50%, Si 0.03~0.06%, P≤0.015%, S≤0.010%, Al 0.020~0.040%, the balance is Fe and unavoidable The low-carbon aluminum-killed cold-heading steel is prepared through steelmaking, continuous casting, hot-rolling and spinning processes. The present invention makes the mechanical properties of the prepared cold heading steel satisfy the tensile strength Rm≤450N / mm through composition adjustment and process optimization 2 , the shrinkage rate Z≥70%, the cold heading steel produced fully meets the requirements of use, and has stable mechanical properties, which can be popularized and used on a large scale.

Description

Technical field [0001] Technical Field The present invention relates to metallurgy, particularly to a low carbon aluminum killed cold heading steel and production method. Background technique [0002] Cold heading steel into a room temperature steel, capable of withstanding the temperature at one or more impact load, are widely used in the production of screws, pins, nuts and other standard parts for the automotive, construction, machinery, electronics, light steel , construction and other industries. With the rapid development of modern industry, cold heading steel of increasingly high performance requirements, at the same time, cold material will be locally significant deformation, in order to prevent substandard products, the production process to ensure the smooth, cold heading steel must have sufficient plastic properties, good surface quality and homogeneous organization. In order to improve the plasticity of steel, the silicon content of the steel are limited in order to i...

Claims

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Application Information

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Patent Type & Authority Patents(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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