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Refining process for aluminum-containing sulfur-controlled steel used for automobile

A technology of automobiles and crafts, applied in the field of metallurgy, can solve problems such as great influence on castability, difficulty in control, degradation of molten steel, etc., and achieve the effect of satisfying the shape of inclusions, ensuring the purity of molten steel, and smooth production

Active Publication Date: 2015-06-17
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of this steel grade has clear and narrow requirements for the range of S and Alt, and it is also an important element that affects the processing performance of steel and the mechanical properties of steel. Castability has a great influence, once the treatment is not good, the molten steel will be degraded or scrapped, which will have a great impact on production, cost, quality, etc.
It is difficult to effectively control S and Alt in the composition of this steel grade in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A refining process for aluminum-containing sulfur-controlled steel for automobiles. The composition mass percentage of aluminum-containing sulfur-controlled steel for automobiles is: C: 0.39%, Mn: 0.65%, P: 0.025%, S: 0.015%, Si: 0.15% , Mo: 0.16%, Cr: 1.05%, Ni: 0.30%, Cu: 0.20%, Alt: 0.020%, Oppm: 2.0%, HPPM: 2.0%, the balance is Fe;

[0015] The production process of the aluminum-containing sulfur-controlling steel for automobiles in this embodiment is: scrap steel + hot molten iron → EBT electric arc furnace smelting → LF refining → VD vacuum degassing → continuous casting into billets;

[0016] At the end of the LF refining process, the S content is controlled to be less than 0.008% and the Alt is within the range of 0.050-0.070%, and other elements can be processed in vacuum refining after reaching the limit according to the judgment range;

[0017] VD vacuum degassing is to control the Alt attenuation and meet the judgment range. Strictly control the vacuum degree ≤ 1 m...

Embodiment 2

[0020] This embodiment is a refining process of aluminum-containing sulfur-controlled steel for automobiles. The component mass percentages of aluminum-containing sulfur-controlled steel for automobiles are: C: 0.42%, Mn: 0.75%, P: 0.02%, S: 0.020%, Si: 0.25%, Mo: 0.20%, Cr: 1.65%, Ni: 0.23%, Cu: 0.10%, Alt: 0.030%, Oppm: 1.0%, HPPM: 1.0%, the balance is Fe;

[0021] The production process of the aluminum-containing sulfur-controlling steel for automobiles in this embodiment is: scrap steel + hot molten iron → EBT electric arc furnace smelting → LF refining → VD vacuum degassing → continuous casting into billets;

[0022] Among them, in the LF refining process, control the S content to less than 0.008% and Alt in the range of 0.050-0.070% at the end of the refining process, and other elements can be processed in vacuum refining after reaching the limit according to the judgment range;

[0023] Among them, VD vacuum degassing is to control the Alt attenuation and meet the judgment ran...

Embodiment 3

[0026] This embodiment is a refining process of aluminum-containing sulfur-controlling steel for automobiles. The composition mass percentage of aluminum-containing sulfur-controlling steel for automobiles is: C: 0.44%, Mn: 0.85%, P: 0.015%, S: 0.030%, Si: 0.35%, Mo: 0.25%, Cr: 1.20%, Ni: 0.10%, Cu: 0.10%, Alt: 0.050%, Oppm: 1.0%, HPPM: 0.5%, the balance is Fe;

[0027] The production process of the aluminum-containing sulfur-controlling steel for automobiles in this embodiment is: scrap steel + hot molten iron → EBT electric arc furnace smelting → LF refining → VD vacuum degassing → continuous casting into billets; its characteristics are:

[0028] Among them, in the LF refining process, control the S content to less than 0.008% and Alt in the range of 0.050-0.070% at the end of the refining process, and other elements can be processed in vacuum refining after reaching the limit according to the judgment range;

[0029] Among them, VD vacuum degassing is to control the Alt decay to ...

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Abstract

The invention discloses a refining process for aluminum-containing sulfur-controlled steel used for an automobile. The aluminum-containing sulfur-controlled steel comprises 0.39 to 0.44% of C, 0.65 to 0.85% of Mn, 0.025% of P, 0.015 to 0.030% of S, 0.15 to 0.35% of Si, 0.16 to 0.25% of Mo, 1.05 to 1.20% of Cr, 0.30% of Ni, 0.20% of Cu, 0.020 to 0.050% of Alt, 2.0% of Oppm and 2.0% of Hppm, with the balance being Fe. The process comprises the following successive steps: preparation of steel scrap and hot-charging of molten iron; EBT electric-arc furnace smelting; LF refining; VD vacuum degassing; and continuous casting for formation of a blank. Through the LF refining and VD vacuum degassing, the contents of the elemental S and Alt are controlled in a desired range. The refining process provided by the invention can ensure the purity of molten steel and guarantee that the shapes of inclusions meet requirements and pouring during continuous casting is smooth.

Description

Technical field [0001] The invention relates to a refining process of a variety of steel in the field of metallurgy, in particular to a refining process of aluminum-containing sulfur-controlled steel for automobiles. Background technique [0002] my country is a country with a large population. Economic development has increased national income. People have an increasing demand for transportation. The demand for transportation not only stays on the basis of convenience, but also pursues comfort. Therefore, people's demand for cars is growing stronger. The process of highway construction is accelerating. With the acceleration of highway construction, especially expressway construction, China's high-grade highway network extending in all directions will change the way people travel and effectively promote the development of the automobile market. The policy and legal environment is gradually improved. The implementation of a series of automobile consumption policies such as the pu...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/22C21C7/064
Inventor 王国柱杨利委朱守欣周剑李凯宋金平
Owner NANJING IRON & STEEL CO LTD
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