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Machining method of 180BH cold-rolled baked hardened high-strength steel for automobiles

A baking hardening and processing method technology, which is applied in the field of advanced high-strength steel for automobiles and metallurgical materials, can solve environmental pollution, traffic congestion and other problems, and achieve the effect of stable 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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  • Machining method of 180BH cold-rolled baked hardened high-strength steel for automobiles
  • Machining method of 180BH cold-rolled baked hardened high-strength steel for automobiles
  • Machining method of 180BH cold-rolled baked hardened high-strength steel for automobiles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The chemical composition (mass fraction / %) of this embodiment is as follows: C 0.0019; Si 0.004; Mn 0.196; P 0.040; S 0.008; Als 0.029; Nb 0.012; Cr 0.065;

[0054] 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%.

[0055] 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.

[0056] The performance index of the present embodiment is as follows: Yield strength 190MPa; Tensile strength 330MPa; Elongation 42%; 90 value 0.21; r 90 Value 2.4; BH 2 Value 55.

Embodiment 2

[0058] The chemical composition (mass fraction / %) of this embodiment is as follows: C 0.0015; Si 0.001; Mn 0.18; P 0.035; S 0.005; Als 0.02; Nb 0.015; Cr 0.072;

[0059] 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%.

[0060] 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.

[0061] The performance index of the present embodiment is as follows: yield strength 205MPa; Tensile strength 325MPa; Elongation 41%; n 90 value 0.23; r 90 Value 1.88; BH 2 Value 35.

Embodiment 3

[0063] The chemical composition (mass fraction / %) of this embodiment is as follows: C 0.0025; Si 0.012; Mn 0.22; P 0.045; S 0.012; Als 0.0373; Nb 0.017; Cr 0.089;

[0064] 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%.

[0065] 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.

[0066] The performance index of the present embodiment is as follows: yield strength 215MPa; Tensile strength 348MPa; Elongation 45.5%; n 90 value 0.24; r 90 Value 2.94; BH 2 Value 48.

[0067] Such as figure 1 As shown in Table 1, the finished structure of cold-rolled bake-hardening high-strength high-strength steel 180...

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Abstract

The invention relates to the field of metallurgical materials, in particular to a machining method of 180BH 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, 0.15-0.30% of Mn, 0.030-0.050% 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 heating temperature of a plate blank ranges from 1150 DEG C to1220 DEG C, the finish rolling temperature is 900 DEG C, and the coiling temperature ranges from 680 DEG C to 720 DEG C; and in the cold rolling process, the cold-rolling reduction ratio is larger than or equal to 70%. 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 cold-rolled baked hardened high-strength steel 180BH product produced through the method 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, which also belongs to the field of advanced high-strength steel for automobiles, and specifically relates to a processing method for 180BH 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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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/12C22C38/18C22C38/02C21D8/02
CPCC22C38/04C21D8/0226C21D8/0247C22C38/02C22C38/06C22C38/12C22C38/18
Inventor 王忠东孙忠斌
Owner BENGANG STEEL PLATES
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