Serpentine differential-temperature rolling method for improving deformation uniformity of hot-rolled plate strip steel

Abstract

The invention discloses a serpentine differential-temperature rolling method for improving the deformation uniformity of hot-rolled plate strip steel. The method comprises the steps that a cross shearzone is formed in a deformation zone through cross shear rolling, and the shear stress generated by the cross shear zone facilitates transfer of the deformation from the surface layer to the center;on the basis of cross shear rolling, a slow working roller moves in the rolling direction or moves a rapid working roller in the opposite direction to form a cross shear zone and an anti-bend zone, and the bending of plate strip steel is restrained by utilizing the anti-bend force of the anti-bend zone to form serpentine rolling; steel plates are subjected to ultra-rapid cooling before rolling toform an outer-hard and inner-soft deformation resistance distribution, and differential temperature rolling is additionally arranged on the basis of serpentine rolling to form serpentine differential-temperature rolling; and a rolling deformation zone is formed in the serpentine differential-temperature rolling zone, and a high-frequency pulse current is applied in the rolling deformation zone. According to the serpentine differential-temperature rolling method, the combined effect of the cross shear rolling, the serpentine rolling, the differential-temperature rolling and the pulse current isfully utilized to improve the deformation uniformity of the plate strip steel in the thickness direction, and meanwhile a good plate shape after rolling is ensured.

Description

technical field [0001] The invention relates to the technical field of hot-rolled strip steel production, in particular to a serpentine differential temperature rolling method for improving the deformation uniformity of hot-rolled strip steel. Background technique [0002] Hot-rolled strip steel, especially thick-gauge hot-rolled high-strength strip steel, has the problems of uneven deformation from the surface to the core and low mechanical properties of the core due to insufficient deformation of the core. In order to improve the mechanical properties of the core and To improve the uniformity of deformation in the thickness direction, the method of increasing the total compression ratio is generally adopted. However, limited by the biting capacity of the rolling mill and the size of the billet, the compression ratio is difficult to meet the process requirements, resulting in insufficient core deformation and uneven microstructure and properties, which have become one of th...

AI Technical Summary

Problems solved by technology

However, limited by the biting capacity of the rolling mill and the size of the billet, the compression ratio is difficult to meet the process requirements, resulting in insufficient core deformation and uneven microstructure and properties, which have become one of the key technical bottlenecks for improving the quality of hot-rolled strip steel.

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