Production method for hot-rolled steel strips for 610 MPa-grade automotive frame

Abstract

The embodiment of the invention provides a production method for hot-rolled steel strips for a 610 MPa-grade automotive frame. Production technological steps of the hot-rolled steel strips for the 610MPa-grade automotive frame comprise rotary furnace smelting, LF furnace refining, continuous casting, rolling plan arrangement, plate blank heating, rough rolling, high-pressure water scale removing,fine rolling, laminar cooling, reeling and pile cooling. Chemical components of the hot-rolled steel strips for the 610 MPa-grade automotive frame comprise, by weight, 0.060-0.090% of C, 0.10-0.20% of Si, 1.35-1.50% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.008% of S, 0.015-0.050% of Al, 0.035-0.045% of Nb, 0.035-0.045% of Ti, smaller than or equal to 0.0045% of N and the balance Fe and inevitable impurities.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to a method for producing 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 ...

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Problems solved by technology

[0010] The embodiment of the present invention provides a production method of a hot-rolled steel strip for a 610MPa-level automobile frame, which can solve the problem that the production process in the existing production method for a hot-rolled steel strip for a 610MPa-level automobile frame has high requirements for equipment, and requires a new slow cooling pit, Increased investment, higher product costs, and the production of 610MPa-grade hot-rolled steel strips for automobile beams are 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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