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High-performance low-alloy high-strength steel plate with pressure of 800 MPa or above and preparation method thereof

A high-strength steel plate, 800mpa technology, applied in the field of metallurgy, can solve the problems of microstructure segregation, affect the processing performance, limit the scope of application of low-alloy high-strength steel, etc., and achieve the effect of improving performance indicators and improving processability.

Active Publication Date: 2021-03-05
唐山钢铁集团高强汽车板有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-alloy high-strength steel above 800MPa has a large amount of alloy added and the annealing temperature is low, so the microstructure segregation is serious, and the grain size segregation or obvious fibrous shape seriously affects the subsequent processing performance and greatly limits Scope of application of high-grade low-alloy high-strength steel

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  • High-performance low-alloy high-strength steel plate with pressure of 800 MPa or above and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The specifications of the high-performance low-alloy high-strength steel plate above 800 MPa in this example are 0.9×1250 mm, and its chemical composition and mass percentage are shown in Table 1.

[0018] The preparation method of the high-performance 800MPa grade or above low-alloy high-strength steel plate in this embodiment includes hot rolling, cold rolling, and tempering processes, and the specific process steps are as follows:

[0019] (1) Hot rolling process: the finishing temperature of hot rolling is 890°C, and the coiling temperature is 650°C;

[0020] (2) Cold rolling process: the heating temperature of the cold rolling control strip is 810°C, the soaking temperature is 810°C, the process of rapid cooling first and then natural cooling is adopted, the rapid cooling rate is 57°C / s, and the end temperature of rapid cooling is 300°C. The final cooling temperature of natural cooling is 130°C;

[0021] (3) Tempering process: the tempering temperature of the low-...

Embodiment 2

[0025] The specification of the high-performance low-alloy high-strength steel plate above 800 MPa in this example is 1.0×1250 mm, and its chemical composition and mass percentage are shown in Table 1.

[0026] The preparation method of the high-performance 800MPa grade or above low-alloy high-strength steel plate in this embodiment includes hot rolling, cold rolling, and tempering processes, and the specific process steps are as follows:

[0027] (1) Hot rolling process: the finishing temperature of hot rolling is 880°C, and the coiling temperature is 650°C;

[0028] (2) Cold rolling process: the heating temperature of the cold rolling control strip is 825°C, the soaking temperature is 815°C, the process of rapid cooling first and then natural cooling is adopted, the rapid cooling rate is 52°C / s, and the end temperature of rapid cooling is 307°C. The final cooling temperature of natural cooling is 130°C;

[0029] (3) Tempering process: the tempering temperature of the low-al...

Embodiment 3

[0033] The specification of the high-performance low-alloy high-strength steel plate above 800 MPa in this embodiment is 1.2×1250 mm, and its chemical composition and mass percentage are shown in Table 1.

[0034] The preparation method of the high-performance 800MPa grade or above low-alloy high-strength steel plate in this embodiment includes hot rolling, cold rolling, and tempering processes, and the specific process steps are as follows:

[0035] (1) Hot rolling process: the finishing temperature of hot rolling is 870°C, and the coiling temperature is 650°C;

[0036] (2) Cold rolling process: the heating temperature of the cold rolling control strip is 830°C, the soaking temperature is 815°C, the process of rapid cooling first and then natural cooling is adopted, the rapid cooling rate is 47°C / s, and the end temperature of rapid cooling is 310°C. The final cooling temperature of natural cooling is 132°C;

[0037] (3) Tempering process: the tempering temperature of the low...

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Abstract

The invention discloses a high-performance low-alloy high-strength steel plate with pressure of 800 MPa or above and a preparation method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.15-0.30% of C, 0.10-0.40% of Si, 1.20-2.0% of Mn, 0.02-0.10% of Ti, 0.010-0.050% of Nb, 0.10-0.50% of Cr, 0.012% or less of P, 0.0090% or less of S, 0.030% or more of Als, 0.0070% or less of N, 0.0015% or less of B and the balance Fe and inevitable impurities. The preparation method comprises the procedures of hot rolling, cold rolling and tempering. Through innovative chemical component design and hot rolling, cold rolling and tempering procedures, the structure, elongation, hole expansion rate and other performance indexes of the produced low-alloy high-strength steel plate are further improved and homogenized, and the machining formability of the product is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-performance low-alloy high-strength steel plate above 800 MPa and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry, people have higher and higher requirements for automobile safety, energy saving and emission, and the application proportion of high-strength steel in the field of automobile parts is also increasing. [0003] Generally, as the strength of high-grade low-alloy high-strength steel is further increased, the processing and forming properties will gradually deteriorate, especially in high-drawing, flanging, and flattening processing methods, such as cracking problems, which limit the high-grade steel. The use of low-alloy high-strength steels. [0004] Under normal circumstances, low-alloy high-strength steel is to control the grain structure by adding some strengthening elements, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/28C22C38/26C22C38/06C21D8/02
CPCC22C38/02C22C38/04C22C38/38C22C38/28C22C38/26C22C38/06C22C38/32C21D8/0226C21D8/0236C21D8/0247C21D2211/009C21D2211/005
Inventor 李建英孙璐王言峰王耐王建兴杨杰李响池永清于磊
Owner 唐山钢铁集团高强汽车板有限公司