1.5 GPa-grade ultrahigh-strength high-plasticity high-reaming DH steel plate and preparation method thereof

An ultra-high-strength, high-plasticity technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of poor product plasticity, difficulty in ultra-high strength, good ductility and formability, etc.

Active Publication Date: 2021-09-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention adopts the production process of cold rolling and continuous annealing to produce cold-rolled dual-phase steel with a strength level

Method used

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  • 1.5 GPa-grade ultrahigh-strength high-plasticity high-reaming DH steel plate and preparation method thereof
  • 1.5 GPa-grade ultrahigh-strength high-plasticity high-reaming DH steel plate and preparation method thereof
  • 1.5 GPa-grade ultrahigh-strength high-plasticity high-reaming DH steel plate and preparation method thereof

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Embodiment Construction

[0040] Below by embodiment the present invention will be further described.

[0041] In the embodiment of the present invention, according to the component ratio of the technical solution, smelting, continuous casting of medium and thin slabs, continuous hot rolling, pickling and cold rolling, continuous annealing and skin pass are carried out;

[0042] (1) Smelting: The temperature of molten steel in the converter is 1650-1750°C;

[0043] (2) Continuous casting of medium and thin slabs: the casting temperature is 1600-1660°C, and the thickness of the continuous casting slab is 100-170mm.

[0044] (3) Continuous hot rolling: billet entering furnace temperature is 450-600°C, heating temperature is 1140-1280°C, starting rolling temperature is 1000-1150°C, finishing rolling temperature is above 880°C, and coiling temperature is 500-650°C;

[0045] The microstructure of the hot-rolled steel plate is ferrite + pearlite + bainite + cementite; the microstructure of the steel plate i...

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Abstract

The invention provides a 1.5 GPa-grade ultrahigh-strength high-plasticity high-reaming DH steel plate and a preparation method thereof. The steel plate comprises the following components in percentages by weight: 0.20%-0.26% of C, 1.8%-2.8% of Mn, 1.0%-2.0% of Si, 0.02%-0.08% of Al, 0.20%-0.80% of Cr, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.02%-0.15% of Nb, 0.02%-0.15% of V, 0-0.10% of Ti and the balance of Fe and inevitable impurities. The preparation method comprises the steps of smelting, medium and thin slab continuous casting, hot continuous rolling, acid pickling and cold rolling, continuous annealing and finishing. The yield strength of the steel plate produced by the method is 1000-1350 MPa, the tensile strength is 1470-1650 MPa, the A80 percentage elongation after fracture is greater than or equal to 9.0%, and the hole expansion rate is greater than or equal to 15%.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a cold-rolled DH1500 steel plate for automobiles with ultra-high strength, high plasticity and high hole expansion performance and a manufacturing method thereof. Background technique [0002] In recent years, as the automotive industry has higher and higher requirements on the formability of materials, traditional dual-phase steels have been difficult to meet the high ductility requirements of complex stamping parts, and TRIP steels have expensive production costs due to high alloy content. This limits its widespread use. Due to the introduction of a certain amount of retained austenite into the traditional dual-phase steel, the DH steel that emerged at the historic moment can make the material exhibit excellent formability through the TRIP effect, which can significantly overcome the shortcomings of DP steel and TRIP steel in the above application process , DH steel ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/06C22C38/24C22C38/26C22C38/28C22C38/38C22C33/04C21D1/26C21D8/02C21D9/46
CPCC22C38/38C22C38/24C22C38/26C22C38/28C22C38/06C22C38/02C22C33/04C21D8/0221C21D1/26C21D9/46C21D2211/008C21D2211/005C21D2211/002C21D2211/001
Inventor 张瑞坤张南郭金宇刘仁东林利徐鑫时晓光高航孙荣生李侠
Owner ANGANG STEEL CO LTD
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