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Processing method for 220BH cold-rolled bake-hardened high-strength steel used for automobiles

A technology of bake hardening and processing method, applied in the fields of metallurgical materials and advanced high-strength steel for automobiles, 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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  • Processing method for 220BH cold-rolled bake-hardened high-strength steel used for automobiles
  • Processing method for 220BH cold-rolled bake-hardened high-strength steel used for automobiles
  • Processing method for 220BH cold-rolled bake-hardened high-strength steel used for automobiles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 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;

[0055] In this embodiment, the heating temperature of the hot-rolled slab is 1180° C., the finish rolling temperature is 900° C., the coiling temperature is 700° C.; the cold rolling reduction is 85%.

[0056] 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.

[0057] 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

[0059] 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;

[0060] In this embodiment, the heating temperature of the hot-rolled slab is 1210° C., the finish rolling temperature is 900° C., the coiling temperature is 710° C.; the cold rolling reduction is 80%.

[0061] 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.

[0062] 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

[0064] 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;

[0065] In this embodiment, the heating temperature of the hot-rolled slab is 1190° C., the finish rolling temperature is 900° C., the coiling temperature is 690° C.; the cold rolling reduction is 90%.

[0066] 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.

[0067] 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.

[0068] Such as figure 1 As shown in Table 1, the finished structure of cold-rolled bake-hardening high-strength high-strength steel 220BH...

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Abstract

The invention relates to the field of metallurgical materials, also belongs to the field of advanced high-strength steel used for automobiles, and particularly provides a processing method for 220BH cold-rolled bake-hardened high-strength steel used for automobiles. The 220BH cold-rolled bake-hardened high-strength steel used for the automobiles comprises, 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. In the hot rolling process, the slab heating temperature is 1150-1220 DEG C, the final rolling temperature is 900 DEG C, and the coiling temperature is 680-720 DEG C; in the cold rolling process, the cold rolling reduction ratio is larger than or equal to 70%; and a continuous annealing process is adopted and comprises the following steps that heat preservation is conducted for 60-120 min at the temperature of 840-860 DEG C; and the steel is cooled to 700-750 DEG C along with a furnace and is rapidly cooled to 400 DEG C at the cooling rate of 25-50 DEG C / second, heat preservation is conducted for 1-3 h, and then the steel is cooled to the room temperature along with the furnace. The 220BH cold-rolled bake-hardened high-strength steel product produced by the processing method is stable in chemical component, and has the stable forming property, the excellent BH property and the normal temperature resisting aging property.

Description

technical field [0001] The invention relates to the field of metallurgical materials, which also belongs to the field of advanced high-strength steel for automobiles, and specifically relates to a processing method for 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 ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/12C22C38/18C21D8/02C21D1/26
CPCC22C38/04C21D1/26C21D8/0226C21D8/0247C22C38/12C22C38/18
Inventor 王忠东孙忠斌
Owner BENGANG STEEL PLATES
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