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Plasticity-enhanced cold-rolled hot-dip galvanized dual-phase steel and production method thereof

A production method and dual-phase steel technology, applied in the field of steel materials, to reduce costs, improve galvanized surface quality, and reduce alloy costs

Inactive Publication Date: 2016-11-16
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a plastically enhanced cold-rolled hot-dip galvanized dual-phase steel and its production method, which solves the technical problem of how to reduce the alloy or process cost and improve the galvanized surface quality on the basis of meeting the strength requirements, and achieves the reduction of alloy Cost, technical effect of improving galvanized surface quality

Method used

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  • Plasticity-enhanced cold-rolled hot-dip galvanized dual-phase steel and production method thereof
  • Plasticity-enhanced cold-rolled hot-dip galvanized dual-phase steel and production method thereof

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Embodiment 1

[0034] In order to solve the technical problem in the prior art that steel strength requirements and alloy costs cannot be satisfied at the same time, the present application provides a cold-rolled hot-dip galvanized dual-phase steel with enhanced plasticity.

[0035] The chemical composition of the dual-phase steel is by weight percentage:

[0036] C: 0.12%-0.18%; Si: 0.3%-0.6%; Mn: 1.3%-2.3%; P: ≤0.01%; S: ≤0.01%; Al: 0.4%-0.9%, the rest is Fe and unavoidable of impurities.

[0037] The metallographic structure diagram of the plastically enhanced cold-rolled hot-dip galvanized dual-phase steel, the metallographic EBSD analysis diagram of the plastically enhanced cold-rolled hot-dip galvanized dual-phase steel, and the plastically enhanced cold-rolled hot-dip galvanized steel TEM analysis diagram of the metallographic phase of dual-phase steel, such as Figure 1 to Figure 3 shown.

[0038] The functions and limits of the above-mentioned main alloying elements are as follow...

Embodiment 2

[0055] Based on the same inventive concept, the present application also provides a method for producing a plastically enhanced cold-rolled hot-dip galvanized dual-phase steel, which is used to produce the plastically enhanced cold-rolled hot-dip galvanized dual-phase steel in Example 1. Such as Figure 4 As shown, the production method of the plastically enhanced cold-rolled hot-dip galvanized dual-phase steel, see Figure 4 , the production method comprises the following steps:

[0056] In step 110, the molten steel is smelted and cast into continuous casting slabs.

[0057] Specifically, the molten steel is smelted and cast into a continuous casting slab, specifically, the molten steel is smelted in a converter, and the steel is cast in a continuous casting manner. The molten steel is the above-mentioned molten steel of the plastically enhanced cold-rolled hot-dip galvanized dual-phase steel.

[0058] Step 120, hot rolling the continuous cast slab to obtain a hot rolled ...

Embodiment 1

[0071] Embodiment 1 to embodiment 4 are cold-rolled hot-dip galvanized dual-phase steels with enhanced plasticity, while the DP590 object and the DP780 object are common dual-phase steels, and the strength level of embodiment 1 and embodiment 2 is 590MPa and traditional DP590 Real object comparison, obviously, the strength grade that embodiment 1 and embodiment 2 provide is that the plastically reinforced cold-rolled hot-dip galvanized dual-phase steel of 590MPa and traditional DP590 object A80 elongation increase 20-40%; Embodiment 3 and embodiment 4 The strength level is 780MPa compared with the traditional DP780 object, obviously, the strength level provided by embodiment 1 and embodiment 2 is 780MPa plastic enhanced cold-rolled hot-dip galvanized dual-phase steel and the traditional DP780 object A80 elongation increased by 20- 40%.

[0072] The plastically enhanced cold-rolled hot-dip galvanized dual-phase steel produces a certain TRIP effect when deformed, thereby produci...

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Abstract

The invention discloses plasticity-enhanced cold-rolled hot-dip galvanized dual-phase steel and a production method thereof. The dual-phase steel comprises the chemical components of, by weight, 0.12-0.18% of C, 0.3-0.6% of Si, 1.3-2.3% of Mn, 0-0.01% of P, 0-0.01% of S, 0.4-0.9% of Al, and the balance Fe and inevitable impurities. The technical problems of how to reduce the alloy or process cost and improve the galvanized surface quality on the basis of meeting the intensity requirement are solved, and the technical effects of reducing the alloy cost and improving the galvanized surface quality are achieved.

Description

technical field [0001] The invention relates to the technical field of steel materials, in particular to a plastically enhanced cold-rolled hot-dip galvanized dual-phase steel and a production method thereof. Background technique [0002] In order to achieve light weight, energy saving and emission reduction of automobiles, and to improve automobile safety, the application of advanced high-strength steel in body-in-white is increasing day by day. Among them, dual-phase steel has become the most widely used steel type in advanced high-strength steel due to its good comprehensive mechanical properties. However, many automobile companies have realized that traditional dual-phase steels are difficult to form on many high-drawability parts during use, and it is difficult to meet the stamping structural parts with complex automotive designs. However, if TRIP steel is used, because of its high alloy content, there are problems such as poor welding performance, and the large margin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/02C22C38/04C21D8/02
CPCC22C38/06C21D8/0205C21D2211/005C21D2211/008C22C38/02C22C38/04
Inventor 韩赟邝霜姜英花刘华赛谢春乾齐秀美王勇围王海全刘广会滕华湘崔阳李飞
Owner SHOUGANG CORPORATION
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