Low-brittleness 650MPa-grade steel for automotive beams and preparation method thereof

An automobile frame, low brittleness technology, applied in the field of metallurgy, can solve the problems of failing to meet the requirements of environmental protection regulations and low strength of steel grades, and achieve the effects of good low temperature toughness, good formability and high strength

Inactive Publication Date: 2014-06-18
武汉钢铁有限公司
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  • Claims
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Problems solved by technology

This type of steel has low strength and cannot meet the requirements of modern heavy-duty commercial vehicle manufacturers for high-strength steel thinning to meet increasingly stringent environmental protection regulations.

Method used

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  • Low-brittleness 650MPa-grade steel for automotive beams and preparation method thereof

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Embodiment

[0049] According to the specific chemical composition shown in Table 1, the low brittle 650MPa grade hot-rolled steel for automobile frame was prepared. The preparation process is as follows:

[0050] Top-bottom compound blowing is carried out on 90-ton and 250-ton converters in steelmaking plants, and hot metal desulfurization technology is adopted to make S in hot metal ≤ 0.005%; ferroalloy is added when 1 / 3 of the steel is tapped after the furnace, and 2 / 3 of the steel is tapped After the addition is complete, the alloying sequence is: ferro-aluminium→ferromanganese→ferro-niobium, use the aluminum adding machine to add aluminum wire for final deoxidation, add titanium during vacuum treatment, and fine-tune the composition so that the chemical composition in the steel meets the requirements in Table 1. Requirements, the balance is Fe and unavoidable inclusions; then the molten steel with the composition shown in Table 1 is poured into a slab with a cross-section of 230-250mm...

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Abstract

The invention discloses low-brittleness 650MPa-grade steel for automotive beams and a preparation method thereof. The steel comprises 0.06-0.08% of C, not more than 0.1% of Si, 1.40-1.60% of Mn, not more than 0.012% of P, not more than 0.005% of S, 0.020-0.070% of Al, 0.035-0.050% of Nb, 0.05-0.075% of Ti, not more than 0.005% of N and the balance of iron and inevitable impurities. The steel is prepared by the processes of molten iron desulfurization, converter smelting, vacuum treatment, continuous casting, slab examination and cleaning, slab heating, hot continuous rolling, laminar cooling, reeling and finishing in sequence. The steel has the beneficial effects that the steel has high strength, and the weight reduction effect can be 10-25% when the steel is used for frame design; the steel has good moldability and is suitable for stamping, rolling, bending and other processes; the steel has good low-temperature toughness and is suitable for transportation in cold regions.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a steel for automobile beams, in particular to a low-brittleness 650MPa steel for automobile beams and a manufacturing method thereof. Background technique [0002] Reducing the weight of the vehicle body by increasing the strength of the steel plate, reducing consumption, saving energy, and reducing environmental pollution are important topics in the research of today's automobile industry. At home and abroad, at this stage, some microalloying elements are mostly used to strengthen the strength of steel. Girder steel, as a safe load-bearing part of passenger and freight vehicles, has high requirements on performance and formability. All domestic steel mills are carrying out research work in related fields. However, the alloying elements, dosage, and process used are different, and are related to the equipment, technology, and raw materials of each factory. At present, the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/06C21D8/02
Inventor 赵江涛刘斌刘永前周祖安张扬彭涛曾萍谢华杨海林
Owner 武汉钢铁有限公司
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