Preparation method of low-alloy high-strength steel plate with low residual stress

Abstract

The invention relates to a preparation method of a low-alloy high-strength steel plate with low residual stress. The preparation method comprises the following steps: smelting; performing continuous casting; heating; performing rough rolling; performing refined rolling; performing laminar flow cooling; coiling; flattening; straightening; tempering; and performing cross cutting. In the heating step, the heating temperature is more than 1200 DEG C; in the refined rolling step, the final rolling temperature is 800 DEG C to 900 DEG C; in the coiling step, the rolling temperature is 550 DEG C to 650 DEG C; and in the tempering step, the tempering temperature is 550 DEG C to 650 DEG C, and the tempering heat insulation time is 10 minutes to 20 minutes. The method is applied to the steel plate which is prepared from the following chemical components: 0.04 percent to 0.12 percent of C, 0.10 percent to 0.80 percent of Si, 1.3 percent to 2.1 percent of Mn, 0 percent to 0.06 percent of Nb, 0.0 to 0.6 percent of Mo, 0 percent to 0.10 percent of V, 0.02 percent to 0.20 percent of Ti, 0.01 percent to 0.06 percent of Al, less than or equal to 0.003 percent of B, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.008 percent of N, and the balance of Fe and inevitable impurities.

Description

technical field [0001] The invention belongs to the field of steel plate production and relates to a method for preparing a low residual stress low alloy high strength steel plate. Background technique [0002] With the continuous development of science and technology, people put forward higher requirements for the matching of strength, toughness and strong plasticity of high-strength steel. After the material is deformed, mainly side bending and warping, the parts cannot meet the requirements of use and cannot be welded, such as the steel used for the boom frame of the concrete pump truck; , such as steel for crane arms; 3) The large residual stress of the steel plate leads to cracking due to stress concentration after the parts are manufactured, such as automobile beam steel. [0003] At present, to solve the problem of residual stress of low-alloy high-strength steel plate, the process of leveling and straightening is mainly adopted, but there is a technical problem of i...

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Problems solved by technology

[0002] With the continuous development of science and technology, people put forward higher requirements for the matching of strength, toughness and strong plasticity of high-strength steel. After the material is deformed, mainly side bending and warping, the parts cannot meet the requirements of use and cannot be welded, such as the steel used for the boom frame of the concrete pump truck; , such as steel for crane booms; 3) The large residual stress of the steel plate leads to cracking due to stress concentration after the parts are manufactured, such as automobile beam steel

[0003] At present, to solve the problem of residual stress in low-alloy high-strength steel plates, it is mainly solved by smoothing and straightening processes, but there is a technical problem of incomplete elimination of residual stress

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