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220BH cold-rolled baked hardened high-strength steel for automobiles

A technology of bake-hardening and high-strength steel, applied in the field of metallurgical materials, can solve problems such as environmental pollution and traffic congestion, and achieve the effect of stabilizing mechanical properties

Inactive Publication Date: 2017-06-30
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while automobiles bring convenience to human travel, they also bring many problems such as traffic congestion and environmental pollution.

Method used

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  • 220BH cold-rolled baked hardened high-strength steel for automobiles
  • 220BH cold-rolled baked hardened high-strength steel for automobiles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The chemical composition (mass fraction / %) of this embodiment is as follows: C 0.00215; Si 0.010; Mn 0.50; P 0.050; S 0.007; Als 0.038; Nb 0.013; Cr 0.066;

[0035] The continuous annealing process of this embodiment is as follows: hold at 850°C for 80 minutes; cool with the furnace to 730°C, and rapidly cool to 400°C at a cooling rate of 30°C / s, hold for 2 hours, and then cool with the furnace to room temperature.

[0036] The performance index of the present embodiment is as follows: Yield strength 236MPa; Tensile strength 345MPa; Elongation 38%; 90 value 0.21; r 90 Value 2.4; BH 2 Value 55.

Embodiment 2

[0038] The chemical composition (mass fraction / %) of this embodiment is as follows: C 0.0016; Si 0.003; Mn 0.42; P 0.040; S 0.005; Als 0.028; Nb 0.016; Cr 0.058;

[0039] The continuous annealing process of the present invention is as follows: heat preservation at 840°C for 90 minutes; cooling to 720°C with the furnace, and rapid cooling to 400°C at a cooling rate of 35°C / s, heat preservation for 3 hours, and cooling to room temperature with the furnace.

[0040] The performance index of the present embodiment is as follows: yield strength 205MPa; Tensile strength 358MPa; Elongation 43%; n 90 value 0.23; r 90 Value 1.88; BH 2 Value 35.

Embodiment 3

[0042] The chemical composition (mass fraction / %) of this embodiment is as follows: C 0.0025; Si 0.03; Mn 0.55; P 0.060; S 0.009; Als 0.038; Nb 0.018; Cr 0.071;

[0043] The continuous annealing process of the present invention is as follows: heat preservation at 860°C for 70 minutes; cooling to 740°C with the furnace, and rapid cooling to 400°C at a cooling rate of 40°C / s, heat preservation for 2 hours, and cooling to room temperature with the furnace.

[0044] The performance index of the present embodiment is as follows: yield strength 215MPa; Tensile strength 352MPa; Elongation 46.5%; n 90 value 0.24; r 90 Value 2.54; BH 2 Value 48.

[0045] Such as figure 1 As shown in Table 1, the finished structure of cold-rolled bake-hardening high-strength high-strength steel 220BH is single ferrite, and the grain size is in the range of 8.0-10.

[0046] Table 1

[0047] Grade metal structure F grain size (grade) 220BH F 8.6

[0048] Such as figure 2 A...

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Abstract

The invention relates to the field of metallurgical materials, in particular to 220BH cold-rolled baked hardened high-strength steel for automobiles and belongs to the field of advanced high-strength steel for the automobiles. The chemical components of the steel include, by mass, 0.0015-0.0025% of C, 0-0.05% of Si, 0.40-0.60% of Mn, 0.040-0.065% of P, 0-0.015% of S, 0.02-0.06% of Als, 0.008-0.020% of Nb, 0.05-0.10% of Cr, 0-0.05% of Mo and the balance Fe. A continuous annealing process is adopted as follows: heat preservation is performed at the temperature of 840 DEG C to 860 DEG C for 60-120 minutes; and furnace cooling is performed till the temperature reaches 700 DEG C to 750 DEG C, quick cooling is performed at the cooling speed of 25 DEG C to 50 DEG C per second till the temperature reaches 400 DEG C, heat preservation is performed for 1-3 h, and then furnace cooling is performed till the temperature reaches the indoor temperature. The chemical components of the produced cold-rolled baked hardened high-strength steel 220 BH product are stable, and the stable forming property, good BH property and room temperature ageing resistance are achieved.

Description

technical field [0001] The invention relates to the field of metallurgical materials, and also belongs to the field of advanced high-strength steel for automobiles, and is specifically a 220BH cold-rolled bake-hardening high-strength steel for automobiles. Background technique [0002] Since 2000, China's auto industry has entered a period of rapid development, and the average annual car production and sales have grown rapidly at double digits. In 2009, China's auto production and sales exceeded 13 million, ranking first in the world; in 2010 China's auto production and sales continued to grow at an astonishing rate and hit a record high again. According to statistics from the China Association of Automobile Manufacturers, the production and sales of automobiles in 2010 increased by 32.44% and 32.37% respectively, reaching 18.2647 million and 18.0619 million; China's automobile production and sales both exceeded 18 million, continuing to rank first in the world. However, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/12C22C38/18C22C38/02C21D9/56C21D1/26
CPCC22C38/04C21D1/26C21D9/56C22C38/02C22C38/06C22C38/12C22C38/18
Inventor 王忠东孙忠斌
Owner BENGANG STEEL PLATES
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