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Production method of B-containing alloy structural steel for automobile parts

A technology for alloy structural steel and auto parts, applied in the field of metallurgy, can solve problems such as poor uniformity, prone to mixed crystals, and large fluctuations in hardenability

Pending Publication Date: 2022-04-29
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some medium-carbon B-containing steels have poor microstructure uniformity, prone to mixed crystals, and large fluctuations in hardenability. How to ensure the uniformity of the medium-carbon B-containing steel structure, so that the hot-rolled state can be used instead of the normalized state, and a normalizing process is omitted. Technology has become a major problem in the industry

Method used

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  • Production method of B-containing alloy structural steel for automobile parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of B-containing alloy structural steel for auto parts, its chemical composition is calculated by weight percentage: C 0.38%, Si0.23%, Mn 1.09%, Cr 0.10%, Al 0.035%, P 0.015%, S 0.020%, Ti 0.034%, Cu 0.03%, N 0.0037%, B 0.0020%, the rest is Fe.

[0028] The process is 120t converter smelting, LF refining, RH vacuum treatment, continuous casting and rolling process

[0029] (1) Converter smelting: control the ratio of molten iron into the converter to 88%, and the carbon content of the steel out of the converter to 0.07%. 3 / t / min, control the tapping temperature of the converter to 1615°C, and do not add Al-containing deoxidizing materials when tapping the converter;

[0030] (2) During the LF refining process, the basicity of the slag is controlled to 4.2, and the LF controls the argon stirring flow throughout the whole process. The argon flow in the whole process does not exceed 190L / min (100-190L / min); while refining Cr, Si, Mn, Al, Ti, S elements are adjuste...

Embodiment 2

[0035] A kind of B-containing alloy structural steel for auto parts, its chemical composition is calculated by weight percentage: C 0.39%, Si0.24%, Mn 1.10%, Cr 0.08%, Al 0.032%, P 0.014%, S 0.022%, Ti 0.035%, Cu 0.04%, N 0.0038%, B 0.0021%, the rest is Fe.

[0036] (1) Converter smelting: control the ratio of molten iron into the converter to 88.5%, and the carbon content of the steel out of the converter to 0.06%. 3 / t / min, control the tapping temperature of the converter to 1620°C, and do not add Al-containing deoxidizing materials when tapping the converter;

[0037] (2) During the LF refining process, the basicity of the slag is controlled to 4.4, and the argon stirring flow is controlled throughout the LF process. The argon flow rate in the whole process does not exceed 195L / min; at the same time, the elements of Cr, Si, Mn, Al, Ti, and S are adjusted in place during refining.

[0038] (3) RH vacuum treatment, the treatment time in high vacuum (≤67pa) is 23 minutes; aft...

Embodiment 3

[0042] A kind of B-containing alloy structural steel for auto parts, its chemical composition is calculated by weight percentage: C 0.38%, Si0.22%, Mn 1.07%, Cr 0.12%, Al 0.032%, P 0.013%, S 0.021%, Ti 0.030%, Cu 0.04%, N 0.0040%, B 0.0019%, the rest is Fe.

[0043] (1) Converter smelting: control the ratio of molten iron into the converter to 88%, and the carbon content of the steel out of the converter to 0.08%. 3 / t / min, control the tapping temperature of the converter to 1618°C, and do not add Al-containing deoxidizing materials when tapping the converter;

[0044] (2) During the LF refining process, the basicity of the slag is controlled to 4.5, and the argon stirring flow is controlled throughout the LF process. The argon flow rate in the whole process does not exceed 200L / min; at the same time, the elements of Cr, Si, Mn, Al, Ti, and S are adjusted in place during refining.

[0045] (3) RH vacuum treatment, the treatment time in high vacuum (≤67pa) is 23 minutes; after...

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Abstract

The invention belongs to the technical field of metallurgy, and discloses a production method of B-containing alloy structural steel for automobile parts, and the steel comprises the following components: 0.36%-0.40% of C, 0.18%-0.35% of Si, 0.85%-1.15% of Mn, 0.05%-0.20% of Cr, less than or equal to 0.020% of P, 0.012%-0.028% of S, 0.028%-0.048% of Al, less than or equal to 0.15% of Cu, 0.025%-0.050% of Ti, 0.0008%-0.0030% of B, less than or equal to 0.0070% of N and the balance of Fe and inevitable impurities. Through reasonable optimization of a smelting process (nitrogen removal in a converter, LF refining and RH vacuum treatment process), a continuous casting process (nitrogen absorption prevention) and a rolling process (controlled rolling and controlled cooling), the N content of the material is controlled, the structure uniformity of the material is improved, and a normalizing process can be omitted for direct use.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a B-containing alloy structural steel for auto parts and a production method thereof, in particular to a steelmaking and rolling process of the B-containing alloy structural steel for auto parts. Background technique [0002] Boron has a strong affinity with oxygen and nitrogen, and can combine with sulfur and carbon, and can also form borides with higher hardness with some metal compounds. Trace amounts of boron can significantly improve the hardenability and toughness of steel. Since it was discovered in the early 20th century that the addition of boron to steel can improve hardenability, boron, as a microalloying element, has been used in high-strength alloy steel, carbon structural steel, and stainless steel. A large number of researches and applications have been carried out in , heat-resistant steels and high-temperature alloys. Many studies have also found that adding an...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/00C22C38/02C22C38/04C22C38/06C22C38/14C22C38/16B21B37/74B22D11/111B22D11/117C21C5/28C21C7/00C21C7/072C21C7/10C21D11/00
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/14C22C38/002C22C38/001C22C38/16C21C5/28C21C7/072C21C7/10C21C7/0006B22D11/111B22D11/117B21B37/74C21D11/00Y02P10/20
Inventor 邓向阳叶玉奎林俊李仕超谢有沈艳
Owner ZENITH STEEL GROUP CORP
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