Method for producing hot-rolling U-shaped steel sheet pile with residual stress less than 100 MPa

Abstract

The invention relates to a method for producing a hot-rolling U-shaped steel sheet pile with a residual stress less than 100 MPa, which comprises the steps of: carrying out smelting, continuous casting and rolling; conveying to a cooling table for cooling, wherein the cooling speed is controlled within 0.5-8 DEG C / s and the cooling temperature, i.e., the temperature before straightening, is controlled at 100-300 DEG C; and straightening at a temperature of 100-300 DEG C. The method for producing the hot-rolling U-shaped steel sheet pile with the residual stress less than 100 MPa has the characteristics that: through controlling the residual temperature of the steel sheet pile before straightening and adopting a straightening process, the residual stress of the hot-rolling U-shaped steel sheet pile is effectively controlled, and the production cost is lowered, and the residual stress is less than 100 MPa, so that the effect of the hot-rolling U-shaped steel sheet pile used for piling is effectively enhanced; in addition, the method is simple to operate and is beneficial to popularization.

Description

technical field [0001] The invention relates to a production method of a hot-rolled U-shaped steel sheet pile, in particular to a production method of a hot-rolled U-shaped steel sheet pile whose residual stress is less than 100 MPa. Background technique [0002] As we all know, the existence of residual stress in steel has a great influence on the service performance of steel, especially the fatigue performance, which includes uneven cooling of the cross section of steel after hot rolling or welding, phase transformation of steel structure, and straightening of steel. Residual stress caused by external force during cold working; residual stress caused by structural changes and microscopic stress between grains. Excessive residual stress will directly affect the piling effect of the hot-rolled U-shaped steel sheet pile, and in severe cases, the hot-rolled U-shaped steel sheet pile will break during piling. [0003] After the hot-rolled U-shaped steel sheet pile is air-coole...

AI Technical Summary

Problems solved by technology

[0005] It is an effective method to reduce the residual stress of steel by annealing, adding static load, mechanical vibration and pulse treatment after straightening, but this method will undoubtedly increase the equipment budget and production cost for the manufacturer. The added value of U-shaped steel sheet piles is greatly reduced, which reduces the market competitiveness of hot-rolled U-shaped steel sheet piles

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