Dual phase steel with tensile strength of 1000 MPa and production method thereof

A technology of tensile strength and production method, applied in the field of steel materials, to achieve the effects of preventing hydrogen embrittlement, reducing alloy cost, improving hole expansion performance and delayed fracture resistance

Active Publication Date: 2016-08-17
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a dual-phase steel with a tensile strength of 1000 MPa and its production method, which solves the technical problem of how to reduce the alloy cost and improve the hole expansion performance and delayed fracture resistance of the material on the basis of meeting the strength requirements, and achieves the improvement Technical effects of hole expansion performance and delayed fracture resistance of dual-phase steel

Method used

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  • Dual phase steel with tensile strength of 1000 MPa and production method thereof
  • Dual phase steel with tensile strength of 1000 MPa and production method thereof
  • Dual phase steel with tensile strength of 1000 MPa and production method thereof

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Embodiment 1

[0035] In order to solve the technical problem in the prior art that the steel strength requirements and the material's hole expansion performance and delayed fracture resistance cannot be satisfied at the same time, the application provides a dual-phase steel with a tensile strength of 1000 MPa.

[0036] The chemical composition of the dual-phase steel is by weight percentage:

[0037] C: 0.08% to 0.11%; Si: 0.2% to 0.6%; Mn: 2.0% to 2.5%; P: ≤0.01%; S: ≤0.01%; Al: 0.02% to 0.06%; Cr: 0.4% to 0.6 %; Ti: 0.02%-0.05%; N: ≤0.003%, the rest is Fe and unavoidable impurities.

[0038] The metallographic structure diagram of the dual-phase steel with a tensile strength of 1000MPa and the metallographic structure diagram of the TiC nano-precipitated phase of the dual-phase steel sample with a tensile strength of 1000MPa, such as figure 1 and Figure 4 shown.

[0039] The functions and limits of the above-mentioned main alloying elements are as follows:

[0040] Carbon C: Carbon i...

Embodiment 2

[0058] Based on the same inventive concept, the present application also provides a method for producing a dual-phase steel with a tensile strength of 1000 MPa, which is used to produce the dual-phase steel with a tensile strength of 1000 MPa in Example 1. Such as Figure 5 As shown, the production method of the dual-phase steel with a tensile strength of 1000MPa, please refer to Figure 5 , the production method comprises the following steps:

[0059] In step 110, the molten steel is smelted and cast into continuous casting slabs.

[0060] 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 dual-phase steel with a tensile strength of 1000 MPa.

[0061] Step 120, hot rolling the continuous cast slab to obtain a hot rolled plate.

[0062] Specifically, the heating temperatur...

example 1

[0075] In Example 1, a 220-ton converter is used for smelting. The target thickness of the hot-rolled steel plate is 4 mm, and the cold-rolled thickness is 1.5 mm. The specific steps of smelting are:

[0076] S1: Smelt molten steel and cast it into continuous casting slabs; strictly control the content of P and S during the smelting process to ensure the quality of casting slabs. The chemical composition of the slab is as follows: calculated by mass percentage C: 0.095wt%; Si: 0.35wt%; Mn: 2.3wt%; P: 0.007wt%; S: 0.005wt%; Al: 0.0035wt%; wt%; Ti: 0.027wt%; N: 0.0027wt%, the rest is Fe and unavoidable impurities.

[0077] S2: Hot rolling the continuous casting slab to obtain a hot rolled plate; the heating temperature of the hot rolling is 1250°C, the finishing temperature of the hot rolling is 873°C, and the coiling temperature of the hot rolling is 669°C. The thickness of the steel plate after hot rolling was 4 mm.

[0078] S3: cold-rolling the hot-rolled sheet to obtain a ...

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Abstract

The invention discloses a dual phase steel with tensile strength of 1000 MPa and a production method thereof. The dual phase steel is composed of the following chemical components in percentage by weight: 0.08%-0.11% of C, 0.2%-0.6% of Si, 2.0%-2.5% of Mn, at most 0.01% of P, at most 0.01% of S, 0.02%-0.06% of Al, 0.4%-0.6% of Cr, 0.02%-0.05% of Ti, at most 0.003% of N, and the balance of Fe and inevitable impurities. The method solves the technical problem of how to lower the alloy cost and enhance the reaming property and delayed fracture resistance of the material on the premise of satisfying the strength requirement.

Description

technical field [0001] The invention relates to the technical field of steel materials, in particular to a dual-phase steel with a tensile strength of 1000 MPa and a production method thereof. Background technique [0002] The lightweight of the car is to reduce the curb weight of the car as much as possible under the premise of ensuring the strength and safety performance of the car, so as to improve the power of the car, reduce fuel consumption, and reduce exhaust pollution. Automobile lightweight has not only become the top priority for the development of my country's automobile industry, but also the trend of the world's automobile development. Due to its good comprehensive mechanical properties, dual-phase steel has incomparable advantages compared with traditional ordinary steel plates, making dual-phase steel begin to be applied in the field of automotive safety components. [0003] As the strength requirements of automobile components increase, the requirements for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/18C22C38/14C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0236C21D8/0273C21D2211/002C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/06C22C38/14C22C38/18
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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