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Hot galvanizing steel plate for car and production method thereof

A technology of hot-dip galvanized steel sheet and production method, which is applied in the direction of metal rolling, can solve the problems of unfavorable auxetic forming and low n90 value, and achieve the effect of meeting production needs

Inactive Publication Date: 2012-12-26
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the existing interstitial-free hot-dip galvanized steel sheet has a low n90 value, which is not conducive to auxetic forming, and to provide a hot-dip galvanized steel sheet for automobiles and a production method thereof

Method used

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  • Hot galvanizing steel plate for car and production method thereof
  • Hot galvanizing steel plate for car and production method thereof
  • Hot galvanizing steel plate for car and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] According to a method for producing steel sheets for automobiles provided in the present invention, the mass percentages of the chemical components of the steel sheets for automobiles produced are: C: 0.003%, Mn: 0.14%, Si: 0.010%, P: 0.010%, S: 0.008%, Alt: 0.038%, Ti: 0.078%, B: 0.004%, N: 0.004%, and the balance is Fe and trace elements. The production process of the steel for automobile sheet is to first smelt molten iron to obtain a steel slab, and then heat the slab. The heating temperature of the slab is 1160°C, the heating time is 3.2 hours, the final rolling temperature is 920°C, and the curling temperature is 720°C. , and then pickling on the pickling mill to remove the surface oxide scale, and then enter the 5-stand cold rolling mill to obtain chilled coils with a reduction rate of 80%. The chilled coil is finally annealed in a vertical continuous annealing furnace, hot-dip galvanized, and skin-passed (0.5% skin elongation), and finally a steel plate for auto...

Embodiment 2

[0073] The difference between this embodiment and Example 1 is that, according to the method for producing steel sheets for automobiles provided in the present invention, the mass percentages of the chemical components of the steel sheets for automobiles produced are: C: 0.0015%, Mn: 0.10%, Si: 0.01 %, P: 0.02%, S: 0.015%, Alt: 0.07%, Ti: 0.09%, B: 0.001%, N: 0.004%, and the balance is Fe and trace elements. The slab heating temperature was 1180° C., and the heating time was 3.4 hours. The specification of the steel plate is 0.7*1200, the reduction rate of cold rolling is 80%, and the skin elongation rate is 0.7%. Other places are completely consistent with embodiment 1. The temperature and mechanical properties of each stage of the annealing process are shown in Table 2.

[0074] Table 2 Mechanical properties of 0.7×1200mm automotive steel plates

[0075]

Embodiment 3

[0077] The difference between this example and Example 1 is that, according to the method for producing steel sheets for automobiles provided in the present invention, the mass percentages of the chemical components of the steel sheets for automobiles produced are: C: 0.001%, Mn: 0.05%, Si: 0.03 %, P: 0.009%, S: 0.008%, Alt: 0.04%, Ti: 0.066%, B: 0.005%, N: 0.0002%, and the balance is Fe and trace elements. The slab heating temperature is 1130°C, the heating time is 3 hours, the finish rolling temperature is 940°C, the coiling temperature is 750°C, the steel plate size is 0.8*1450, the cold rolling reduction rate is 77%, and the skin elongation rate is 0.8% Other places are completely consistent with embodiment 1. The temperature and mechanical properties of each stage of the annealing process are shown in Table 3.

[0078] Table 3 Mechanical properties of 0.8×1450mm automotive steel plates

[0079]

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Abstract

The invention discloses a hot galvanizing steel plate for a car. The hot galvanizing steel plate comprises the following chemical components by weight: C is more than or equal to 0.001% and is less than or equal to 0.003%, Mn is more than or equal to 0.05% and is less than or equal to 0. 15%, Si is less than or equal to 0.03%, P is less than or equal to 0.02%, S is more than or equal to 0.008% and is less than or equal to 0.015%, Alt is more than or equal to 0.02% and is less than or equal to 0.07%, Ti is more than or equal to 0.05% and is less than or equal to 0.09%, B is more than or equal to 0.0002% and is less than or equal to 0.010%, N is less than or equal to 0.004% and the balance of Fe and trace element. The invention also discloses a method for producing the hot galvanizing steel plate for the car; according to the hot galvanizing steel plate for the car and the production method of the hot galvanizing steel plate, the sulfur content in steel making can be adjusted based on the mixture ratio of components, and the technology of hot rolling, continuous annealing, hot galvanizing steel and finishing are optimized, thus producing the continuous annealing hot galvanizing steel, so that the steel plate has the characteristics of high processing hardening index of n90 value, and the requirements on demand of expanding-formed car plate are satisfied.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a hot-dip galvanized steel sheet for automobiles and a production method thereof. Background technique [0002] Interstitial atom-free hot-dip galvanized steel sheet (DX54D+Z), which is produced by continuous annealing process in large quantities, is mostly used in the automotive industry, including many deep drawing-expansion forming (abbreviated as auxetic forming) parts, such as: door inner panel , fenders, rear longitudinal beams, etc., according to the requirements of CB / T 2518-2008 for similar steel types, its composition is: 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%, n90≥0.18, r90≥1.6. In the European standard EN10346-2009, the comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02B21B1/22
Inventor 蒋光锐胡燕慧滕华湘邝霜尉冬熊爱明朱国森刘光明
Owner SHOUGANG CORPORATION
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