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A kind of steel for 550mpa grade automobile structure and its production method

A production method and automobile structure technology, applied in the field of 550MPa automobile structural steel and production, can solve the problems of no anti-corrosion performance, not meeting the requirements of high-strength formed automobile parts, etc.

Active Publication Date: 2021-09-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Chinese patent application with the notification number CN 105369134 B discloses a 400MPa grade pickling-free automotive structural hot-rolled steel plate and its production method. It is a common C-Mn component system design, which is produced by solid solution strengthening of carbon and manganese elements to improve strength. Hot-rolled steel plate, but the highest yield strength of the steel plate is 311MPa, which does not meet the requirements of high-strength formed auto parts, and has no anti-corrosion performance

Method used

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  • A kind of steel for 550mpa grade automobile structure and its production method
  • A kind of steel for 550mpa grade automobile structure and its production method
  • A kind of steel for 550mpa grade automobile structure and its production method

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Embodiment

[0049] See Table 1-5 for the specific composition, temperature regime, finishing tension control parameters, properties of the steel plate, and tissue volume percentage of the six embodiments of the present invention.

[0050] The chemical composition (wt, %) of the embodiment of the present invention of table 1

[0051]

[0052]

[0053] The hot rolling temperature system of table 2 embodiment of the present invention

[0054]

[0055] Table 3 embodiment finish rolling tension control parameters

[0056]

[0057] The mechanical property parameter of table 4 embodiment of the present invention

[0058]

[0059]

[0060] Tissue volume percent in the embodiment of the present invention in table 5

[0061] Numbering ferrite Bainite Example 1 25％ 75％ Example 2 28％ 72％ Example 3 30％ 70％ Example 4 35％ 65％ Example 5 32％ 68％ Example 6 33％ 67％

[0062] .

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PUM

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Abstract

The invention relates to a 550MPa grade steel for automobile structure and a production method. The chemical composition is calculated by mass percentage: C: 0.075%-0.10%, Si: 0.02%-0.10%, Mn: 1.50%-1.80%, Al: 0.020% ~0.040%, Nb: 0.045%~0.055%, V: 0.010%~0.030%, Cr: 0.25%~0.35%, Cu: 0.30%~0.90%, Sb: 0.064%~0.20%, Ni: 0.012%~0.025% %, Bi: 0.010% to 0.045%, P≤0.015%, S≤0.006%, and the balance is Fe and unavoidable impurities. The advantages are: it has excellent mechanical properties and anti-corrosion properties, and adopts the rapid and continuous cooling process in the front section after rolling to avoid the formation of banded structures in the steel plate.

Description

technical field [0001] The invention belongs to the field of steel production for automobile structures, and in particular relates to a 550MPa grade steel for automobile structures and a production method. Background technique [0002] With the rapid development of my country's automobile industry, traffic and transportation industry, especially the increasing demand for large-tonnage trucks, in order to reduce the weight of automobile structural components to reduce their own weight, to achieve energy saving, reduce environmental pollution and improve transportation efficiency , which promotes the application of high-performance, high-surface-quality hot-rolled automotive steel sheets. The protective measures for the corrosion of steel plates in the modern automobile industry are generally galvanized or brushed with anti-corrosion paint on the surface of the steel plates, and the steel plates themselves do not have anti-corrosion properties. Once the anti-corrosion coating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C21D8/02
CPCC21D8/0226C22C38/002C22C38/42C22C38/46C22C38/48C22C38/58C22C38/60
Inventor 孙成钱时晓光董毅刘仁东徐荣杰王俊雄韩楚菲
Owner ANGANG STEEL CO LTD