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A kind of hot-dip galvanized steel sheet with high work hardening index for automobile

A technology of work hardening index and hot-dip galvanized steel sheet, which is applied in the field of metal material processing, and can solve the problems of unfavorable auxetic forming and low work hardening index n90 value

Active Publication Date: 2017-01-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a hot-dip galvanized steel sheet with a high work-hardening index for automobiles, aiming to overcome the problem that the existing hot-dip galvanized steel sheet with a high work-hardening index for automobiles without interstitial atoms has a low work-hardening index n90 value, which is not conducive to auxetic forming

Method used

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  • A kind of hot-dip galvanized steel sheet with high work hardening index for automobile
  • A kind of hot-dip galvanized steel sheet with high work hardening index for automobile
  • A kind of hot-dip galvanized steel sheet with high work hardening index for automobile

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Experimental program
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Effect test

Embodiment 1

[0044] The high work hardening index hot-dip galvanized steel sheet for automobiles produced according to the method provided in the present invention has the following chemical composition mass percentages: C: 0.005%, Mn: 0.1%, Si: 0.010%, P: 0.02%, S: 0.015%, S / C: 3, Alt: 0.07%, N: 0.004%, Ti-4C-1.5S-3.42N: 0.06%, Cu+Cr+Ni: 0.02%, and the balance is Fe and trace elements. The production process of the steel for automobile plates is to smelt molten iron to obtain steel slabs, and then heat the slabs. The heating temperature of the slabs is 1200°C. The total reduction ratio of the last three passes of finish rolling is 0.5, and the curling temperature is 720 ℃, after cold-rolling, annealing and galvanizing, a hot-dip galvanized steel sheet with a specification of 0.5×1000mm for automobiles with a high work hardening index is finally obtained. Its mechanical properties are shown in Table 1. The TiC precipitates in the annealed steel strip were measured by transmission electron...

Embodiment 2

[0048] According to the method provided in the present invention, the hot-dip galvanized steel sheet with a high work hardening index for automobiles has the following chemical composition mass percentages: C: 0.003%, Mn: 0.05%, Si: 0.007%, P: 0.01%, S: 0.008%, S / C: 2.67, Alt: 0.04%, N: 0.002%, Ti-4C-1.5S-3.42N: 0.04%, Cu+Cr+Ni: 0.01%, and the balance is Fe and trace elements. The heating temperature of the slab is 1100°C, the total reduction rate of the last three passes of finish rolling is 0.7, and the coiling temperature is 740°C. After cold rolling, annealing and galvanizing, a high work-hardening index hot plate for automobiles with a specification of 0.7×1200mm is finally obtained. Galvanized steel. Its mechanical properties are shown in Table 2.

[0049] Table 2

[0050] Re, MPa Rm, MPa A 80 ，％

Embodiment 3

[0052] According to the method provided in the present invention, the hot-dip galvanized steel sheet with a high work hardening index for automobiles has the following chemical composition mass percentages: C: 0.004%, Mn: 0.08%, Si: 0.008%, P: 0.015%, S: 0.013%, S / C: 3.25, Alt: 0.05%, N: 0.003%, Ti-4C-1.5S-3.42N: 0.02%, Cu+Cr+Ni: 0.015%, and the balance is Fe and trace elements. The slab heating temperature is 1150°C, the total reduction ratio of the last three passes of finish rolling is 0.8, the coiling temperature is 760°C, and the steel plate size is 0.8×1450mm. Its mechanical properties are shown in Table 3.

[0053] table 3

[0054] Re, MPa Rm, MPa A 80 ，％

n90 r90 150 284 44.5 0.23 2.45 153 280 44 0.24 2.58 143 276 45.5 0.25 2.34 145 281 45 0.25 2.49

[0055] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0056] A hot-dip galvaniz...

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Abstract

The invention discloses a hot-dip galvanized steel sheet with a high work hardening index for automobiles and a production method of the hot-dip galvanized steel sheet. The hot-dip galvanized steel sheet comprises the following chemical components in percentage by mass: not less than 0.003% and not more than 0.005% of C, not more than 0.1% of Mn, not more than 0.01% of Si, not more than 0.02% of P, not less than 2.67 of S / C, not more than 0.015% of S, not less than 0.02% and not more than 0.07% of Alt, not more than 0.004% of N, not less than 0.02% and not more than 0.06% of Ti-4C-1.5S-3.42N, not more than 0.02% of Cu+Cr+Ni, and the balance of Fe and microelements. According to the steel sheet, the sulphur content in the steel-making process is adjusted by composition proportion, production is carried out on the basis of optimization of a hot rolling process, and the hot-dip galvanized steel sheet has relatively high work hardening index n90 value, and can meet the production requirements of drawing and bulging automobile sheets.

Description

technical field [0001] The application relates to the field of metal material processing, in particular to a hot-dip galvanized steel sheet with a high work hardening index for automobiles. Background technique [0002] Hot-dip galvanized steel sheet with high work hardening index (DX54D+Z) for interstitial-free automobiles is now produced by continuous annealing process in large quantities, and it is mostly used in the automotive industry, including many deep drawing-expansion forming (abbreviated as auxetic forming) parts , such as: door inner panels, fenders, rear longitudinal beams, etc., according to the requirements of CB / T 2518-2008 for similar steel types, the chemical composition mass percentages are: C≤0.12%, Mn≤0.60%, Si≤0.50 %, P≤0.10%, S≤0.045%, Ti≤0.30%, and the balance is Fe. The national standard CB / T 2518-2008 requires the yield strength to be 120MPa≤Rel≤220MPa, the tensile strength to be 260MPa≤Rm≤350MPa, and the elongation after fracture to be A80≥36%, n9...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/28C22C38/50C21D8/02
Inventor 蒋光锐刘李斌邝霜尉冬王海全胡燕慧闻达滕华湘刘光明
Owner SHOUGANG CORPORATION
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