1.5gpa grade ultra-high-strength, high-plasticity, and high-hole-expansion DH steel plate and preparation method

An ultra-high-strength, high-plasticity technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve difficult problems such as ultra-high strength, good ductility and formability, and poor product plasticity, so as to improve ductility and production Low cost, good impact energy absorption effect

Active Publication Date: 2022-07-22
ANGANG STEEL CO LTD
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  • 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 of 1200MPa. However, the product has very poor plasticity, and it is difficult to combine ultra-high strength with good ductility and formability.

Method used

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  • 1.5gpa grade ultra-high-strength, high-plasticity, and high-hole-expansion DH steel plate and preparation method
  • 1.5gpa grade ultra-high-strength, high-plasticity, and high-hole-expansion DH steel plate and preparation method
  • 1.5gpa grade ultra-high-strength, high-plasticity, and high-hole-expansion DH steel plate and preparation method

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Embodiment Construction

[0040] The present invention will be further illustrated by the following examples.

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

[0042] (1) Smelting: converter molten steel temperature 1650 ~ 1750 ℃;

[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 100-170 mm.

[0044] (3) Hot continuous rolling: the temperature of the billet entering the furnace is 450-600°C, the heating temperature is 1140-1280°C, the rolling temperature is 1000-1150°C, the final rolling temperature is above 880°C, and the coiling temperature is 500-650°C;

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

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Abstract

The invention provides a 1.5GPa grade ultra-high-strength, high-plasticity, and high-hole-expansion DH steel plate and a preparation method. The components of the steel plate are as follows in weight percentage: C: 0.20%-0.26%, Mn: 1.8%-2.8%, Si: 1.0%~2.0%, Al: 0.02%~0.08%, Cr: 0.20~0.80%, P≤0.01%, S≤0.01%, Nb: 0.02%~0.15%, V: 0.02~0.15%, Ti: 0~ 0.10%, the balance is Fe and inevitable impurities; the preparation method includes smelting, continuous casting of medium and thin slabs, hot continuous rolling, pickling and cold rolling, continuous annealing, and smoothing; the yield strength of the steel plate produced by the application of the invention is 1000 ~1350MPa, tensile strength 1470~1650MPa, A80 elongation after fracture ≥9.0%, hole expansion rate ≥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 for the formability of materials, traditional dual-phase steels have been unable to meet the high ductility requirements of complex stampings, while TRIP steels bring expensive production costs due to high alloy content. which 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 emerges as the times requires, the material exhibits 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 has become...

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Application Information

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Patent Type & Authority Patents(China)
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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