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Low-carbon, low-silicon, cold-rolled and hot-galvanized dual-phase steel for extra-deep drawing and preparation method thereof

A low-carbon, low-silicon, dual-phase steel technology is applied in the field of low-carbon, low-silicon, cold-rolled hot-dip galvanized dual-phase steel for ultra-deep drawing and its preparation field. The effect of expanding the use ratio

Inactive Publication Date: 2014-12-24
朱忠良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of some interstitial atoms, especially solid solution carbon, it will prevent the development of {111} direction texture during the recrystallization process, and accelerate the development of other textures such as {100}, so for general low carbon steel in After annealing, it is easy to form Gauss texture or brass texture, which are not conducive to the deep drawing performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] According to the chemical composition given in Table 1, vacuum smelting in an electromagnetic induction furnace is used to carry out subsequent processes on the cast blank.

[0024] Table 1 is the mass percent of each composition

[0025]

C

Si

mn

P

S

Al

Cr

Mo

Example 1

0.036

0.038

1.34

0.013

0.005

0.07

0.52

0.36

Example 2

0.039

0.043

1.55

0.008

0.003

0.055

0.57

0.42

[0026] Example 3

0.043

0.048

1.68

0.004

0.001

0.025

0.63

0.45

[0027] The above hot rolling process is to heat the forged billet to 1200°C and keep it warm for 1.5 hours, then hot rolling on a hot rolling mill for 6 passes to obtain a hot rolled sheet with a thickness of about 3-4mm, with a total deformation of 85%-90 %, the rolling, finishing and simulated coiling temperatures are 700°C.

[0028] The cold rolling process is to ro...

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PUM

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Abstract

The invention relates to low-carbon, low-silicon, cold-rolled and hot-galvanized dual-phase steel for extra-deep drawing and a preparation method thereof. The dual-phase steel comprises chemical components in percentages by mass as follows: 0.035%-0.045% of C, 0.03%-0.05% of Si, 1.3%-1.75% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.008% of S, smaller than or equal to 0.075% of Al, 0.5%-0.68% of Cr, 0.35%-0.5% of Mo and the balance of Fe and unavoidable impurities, wherein the content of P, S and Al is not 0, texture in the {111} / / RD direction in microstructures of the dual-phase steel occupies more than 90 vol.%, the main microstructures adopt ferrite and martensite structures, the tension strength of the dual-phase steel ranges from 485-600 MPa, the elongation is higher than or equal to 32%, and an r value is 2-2.2. The dual-phase steel is matched with the corresponding preparation method. By means of the invention, certain quantity of Cr and Mo elements are added into the low-carbon dual-phase steel, a texture pre-treatment process is adopted, so that the deep drawability of a material is improved remarkably under certain strength condition, and the hot galvanizing performance of the material is improved sufficiently.

Description

technical field [0001] The invention belongs to the field of metal materials, and mainly relates to the preparation of a high-strength, ultra-deep drawn ferrite plus martensitic cold-rolled hot-dip galvanized dual-phase steel, adding Cr and Mo elements to the low-carbon steel, and adopting weaving The structural pretreatment process makes the material greatly improve its deep drawing performance under the condition of certain strength, and at the same time controls the Si content ≤ 0.05% (mass percentage), which fully improves the hot-dip galvanizing performance of the material. Background technique [0002] Cold-rolled dual-phase steel has attracted more and more attention in modern automotive steel because of its high strength, high elongation, high work hardening index and continuous yield. Traditional dual-phase steel is mainly used in reinforcements of automotive products, such as bumpers, profiles, and brackets. In order to reduce the weight of the vehicle to a greater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/22C21D8/02
Inventor 朱忠良
Owner 朱忠良
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