Continuous annealing cold-rolled carbon steel for stamping and preparation method thereof

Abstract

The invention discloses continuous annealing cold-rolled carbon steel for stamping. The continuous annealing cold-rolled carbon steel comprises the following chemical components in percentage by mass:less than or equal to 0.0060% of C, less than or equal to 0.05% of Si, 0.15%-0.3% of Mn, 0.015-0.025% of P, less than or equal to 0.018% of S, 0.035%-0.065% of Al, 0.035%-0.09% of Ti and the balanceFe and inevitable impurities. The invention further discloses a method. The method comprises the following steps: casting a blank, heating before rolling, hot rolling, cooling after rolling, coiling,pickling, cold rolling, annealing and flattening, wherein the heating temperature before rolling is 1150-1200 DEG C, the coiling temperature is 600-680 DEG C, a F1-F3 grinding smooth roll is subjectedto pickling rolling, a 0.8-2.5 microns roughening roll is used for F4, the annealing temperature is 760-800 DEG C, and the flattening elongation is 0.8-1.3%. According to the continuous annealing cold-rolled carbon steel for stamping, the surface of strip steel is free of stamping roughness defects after more than 4% of strip steel is subjected to stamping forming.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a continuous annealed cold-rolled carbon steel for stamping and a preparation method thereof. Background technique [0002] The continuous annealing cold-rolled carbon steel for continuous annealing stamping is mainly used in the stamping production of automobile plates. The surface quality of the material in the Kaiping blanking process is good and there are no stamping rough defects, but stamping rough defects appear after more than 4% stamping deformation, which cannot meet the requirements of automotive exterior board quality requirements. Surface defects of cold-rolled sheets are one of the important defects that affect the performance of steel sheets. Surface defects will amplify defects during cold-rolled stamping deformation, resulting in the surface of stamping parts not meeting the requirements for use. The surface defects of ultra-low carbon steel hot-rolled...

AI Technical Summary

Problems solved by technology

[0002] The continuous annealing cold-rolled carbon steel for continuous annealing stamping is mainly used in the stamping production of automobile plates. The surface quality of the material in the Kaiping blanking process is good and there are no stamping rough defects, but stamping rough defects appear after more than 4% stamping deformation, which cannot meet the requirements of automotive exterior Board Quality Requirements

Surface defects of cold-rolled sheets are one of the important defects that affect the performance of steel sheets. Surface defects will amplify defects during cold-rolled stamping deformation, resulting in the surface of stamping parts not meeting the requirements for use.

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