600 MPa-grade highly-chambered steel plate for automotive chassis and manufacturing method thereof

A technology for automobile chassis and steel plates, applied in the field of steel rolling, which can solve the problems of complex cooling process in hot rolling process, difficulty in precise control, high hole expansion rate, etc., achieve good strength and hole expansion rate matching, low cost, and simple hot rolling process Effect

CN105506476AInactive Publication Date: 2016-04-20ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a 600 MPa-grade highly-chambered steel plate for automotive chassis. Steel of the steel plate is composed of, in percentage by weight, 0.04-0.10% of C, Si smaller than 0.70%, 1.0-1.6% of Mn, 0.02-0.08% of Als, 0.01-0.05% of Nb, P smaller than 0.015%, S smaller than 0.005% and the balance Fe and inevitable impurities. The invention further provides a manufacturing method of the steel plate. The method comprises the steps of heating continuous casting sheet billets with the thickness ranging from 80 mm to 230 mm to 1220+ / -20 DEG C, and preserving the temperature for 1.8-3 hours; carrying out two-stage rolling, wherein the rolling temperature of the recrystallizing region is higher than 1050 DEG C, the thickness of intermediate billets ranges from 35 mm to 60 mm, the finish rolling temperature of the non-recrystallizing region ranges from 840 DEG C to 920 DEG C, and the thickness of finished products ranges from 2.0 mm to 6.0 mm; carrying out continuous laminar flow cooling after finish rolling, wherein the cooling rate is 20-40 DEG C / s and the coiling temperature ranges from 450 DEG C to 580 DEG C. According to the invention, the steel plate is high in alloy content and low in cost, the hot rolling process is simple, the rolling performance of the steel plate is uniform, and the matching performance between the strength and the hole chambering rate is good.
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Description

technical field

[0001] The invention belongs to the field of steel rolling, and in particular relates to a hot-rolled high-hole expansion steel plate produced on a CSP continuous rolling line with a tensile strength reaching 600 MPa and a manufacturing method thereof. Background technique

[0002] In recent years, with the rapid development of the automobile industry, automobiles have increasingly strict requirements on steel materials. While the strength requirements for steel materials have been increased, it is also necessary to ensure the machinability of steel under high-strength conditions, and at the same time meet the requirements of various industries. Special requirements for processing performance of auto parts. As an important part of the vehicle, automobile chassis parts have complex shapes and require forming methods including stretching, bending, and hole expansion during the manufacturing process. higher requirements. Under such conditions, hot-rolled high-...

Examples

Embodiment Construction

[0029] Below by embodiment the present invention will be further described.

[0030] In the embodiment of the present invention, smelting, continuous casting, heating, rolling, cooling, and crimping are carried out according to the component ratio of the technical solution.

[0031] The specific manufacturing method is to heat the continuous casting slab with a thickness of 80-230mm to 1220±20°C, hold it for 1.8-3 hours, and then carry out two-stage controlled rolling on the medium and thin slab continuous casting and rolling production line. The rolling temperature in the recrystallization zone is higher than 1050°C, the thickness of the intermediate billet is 35-60mm, and the final rolling temperature in the non-recrystallized area is 840-920°C. Continuous cooling is adopted after final rolling, the cooling rate is 20-40°C / s, the coiling temperature is 450-580°C, and the thickness of the finished product is 2.0-6.0mm. The chemical composition of the steel of the embodiment ...