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Low-brittleness 700MPa-level automobile beam steel and manufacturing method thereof

A technology of automobile frame and low brittleness, which is 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: 2014-06-11
武汉钢铁有限公司
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  • Abstract
  • Description
  • 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 700MPa-level automobile beam steel and manufacturing method thereof

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Embodiment

[0049] The low-brittleness 700MPa grade hot-rolled steel for automobile frame was prepared according to the specific chemical composition shown in Table 1. 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 230-25...

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Abstract

The invention discloses low-brittleness 700MPa-level automobile beam steel and a manufacturing method thereof. The low-brittleness 700MPa-level automobile beam steel comprises the following chemical components in percentage by mass: 0.05-0.07% of C, less than 0.1% of Si, 1.45-1.75% of Mn, less than 0.012% of P, less than 0.005% of S, 0.020-0.070% of Al, 0.035-0.050% of Nb, 0.08-0.1% of Ti, less than 0.005% of N and the balance of iron and unavoidable impurities. The low-brittleness 700MPa-level automobile beam steel is manufactured by the steps of molten iron desulfurization, converter smelting, vacuum treatment, continuous casting, slab checking and cleaning, slab heating, hot continuous rolling, laminar flow cooling, coiling and finishing. The low-brittleness 700MPa-level automobile beam steel disclosed by the invention has high strength, and the weight reducing effect can reach 10-25% in frame design; with good formability, the low-brittleness 700MPa-level automobile beam steel is suitable for the processes of stamping, rolling, bending and the like; with low-temperature toughness, the low-brittleness 700MPa-level automobile beam steel is suitable for the 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 700MPa grade 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. ...

Claims

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Application Information

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IPC IPC(8): C22C38/14
Inventor 赵江涛刘永前刘斌周祖安彭涛杨海林曾萍张扬徐浩
Owner 武汉钢铁有限公司
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