A 610mpa grade hot-rolled steel strip for automobile girders

Abstract

The embodiment of the present invention provides a hot-rolled steel strip for a 610MPa-level automobile frame, the chemical composition and weight percentage of the hot-rolled steel strip for a 610MPa-level automobile frame are: carbon C: 0.060-0.090%, silicon Si : 0.10~0.20%, manganese Mn: 1.35~1.50%, phosphorus P≤0.020%, sulfur S≤0.008%, aluminum Als: 0.015~0.050%, niobium Nb: 0.035~0.045%, titanium Ti: 0.035~0.045%, Nitrogen N≤0.0045%, the balance is Fe and unavoidable impurities.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to a 610MPa-level hot-rolled steel strip for automobile girders. Background technique [0002] The frame of a commercial vehicle is usually riveted by beams, longitudinal beams, lining beams, and some reinforcements. The quality of the frame affects the service life and driving safety of the vehicle. Therefore, the steel belt for the automobile frame must have good formability, welding Comprehensive properties such as durability, fatigue resistance and low temperature toughness. With the development of lightweight commercial vehicles, the strength level of the steel belt used for the automobile frame gradually changes from the conventional 510MPa level to 610MPa level, or even 700MPa level. However, as the strength of the steel belt used for the The problem of camber (side bending) is also becoming more and more prominent, which seriously affects the r...

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Problems solved by technology

[0010] The embodiment of the present invention provides a 610MPa-level hot-rolled steel strip for automobile girders, which can solve the problem that the existing production process of 610MPa-grade hot-rolled steel strips for automobile girders has high requirements for equipment, requires new slow cooling pits, increases investment, and reduces product costs. Higher, the production of hot-rolled steel strips for 610MPa grade automobile beams is prone to problems such as poor shape and large internal stress. The steel strip not only has good plasticity, low temperature toughness, cold formability, fatigue resistance and high strength, but also has high Dimensional accuracy and plate shape, the cost of steel strip products is relatively low, the requirements for production equipment are not high, there is no obvious camber (side bending) after longitudinal cutting, and the steel plate has good comprehensive properties

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