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Low-brittleness 800MPa-grade steel for automotive beams and preparation method thereof

An automobile beam, 800mpa technology, applied in the field of metallurgy, can solve the problems of low steel strength and failure to meet the requirements of environmental protection regulations, and achieve the effects of good formability, good low temperature toughness and high strength

Active Publication Date: 2014-06-18
武汉钢铁有限公司
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  • Description
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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 800MPa-grade steel for automotive beams and preparation method thereof

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Embodiment

[0050] According to the specific chemical composition shown in Table 1, the low brittleness 800MPa grade hot-rolled steel for automobile frame was prepared. The preparation process is as follows:

[0051] 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: Al-Fe → Ferro-Manganese → Ferro-Niobium → Ferro-Molybdenum. Use an aluminum adding machine to add aluminum wires for final deoxidation, add titanium during vacuum treatment, and fine-tune the composition so that the chemical composition in the steel meets According to the requirements of Table 1, the balance is Fe and unavoidable inclusions; then pour the molten steel with the composition shown in Table 1 into a slab with a cross-section ...

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Abstract

The invention discloses low-brittleness 800MPa-grade steel for automotive beams and a preparation method thereof. The steel comprises 0.04-0.06% of C, not more than 0.1% of Si, 1.9-2.2% of Mn, not more than 0.012% of P, not more than 0.005% of S, 0.020-0.070% of Al, 0.04-0.06% of Nb, 0.105-0.13% of Ti, 0.15-0.22% of Mo, not more than 0.005% of N and the balance of iron and inevitable impurities. The preparation method is characterized by firstly heating a continuous casting slab to 1280-1330 DEG C within 200-300 minutes to carry out rough rolling, and controlling the temperature at 1040-1140 DEG C after rough rolling is finished to carry out finish rolling. 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 longitudinal beams, in particular to a low-brittleness 800MPa grade automobile beam steel 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 p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 赵江涛周祖安彭涛刘永前刘斌桂洲谢华杨海林徐浩
Owner 武汉钢铁有限公司
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