Method for preventing surface of Ti-IF steel from forming crack defects

Abstract

The invention relates to a method for preventing the surface of Ti-IF steel from forming crack defects, which belongs to the technical field of thin plate production. The method comprises the following Ti-IF steel production processes of: smelting, continuously casting, heating plate blanks, performing hot tandem rolling, reeling, performing acid tandem rolling, continuously annealing, leveling, and reeling to obtain finished products. The Ti-IF steel comprises the following components in percentage by weight: 0.0015 to 0.0050 percent of C, less than or equal to 0.03 percent of Si, 0.05 to 0.25 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, 0.005 to 0.07 percent of Alt, 0.05 to 0.12 percent of Ti, less than or equal to 0.007 percent of N and the balance of Fe. In the rolling process, the plate blank heating temperature is between 1,200 and 1,300 DEG C; the final rolling temperature is between 890 and 920 DEG C; the reeling temperature is between 640 and 700 DEG C; the acid rolling down rate is between 70 and 80 percent; and the annealing temperature is between 760 and 850 DEG C. The invention has the advantages that: plates do not have the crack defects after being stamped and meet the using requirements of automobile shell plates and O5 plates for home appliance shell plates by rationally matching chemical components and a hot rolling process on the premise of high deep drawability; and the method has great economic value.

Description

technical field [0001] The invention belongs to the technical field of thin plate production, and in particular provides a method for controlling the surface forming grain defect of Ti-IF steel, which is suitable for the iron and steel industry to produce cold-rolled strip steel with high surface quality. Background technique [0002] Ti-IF steel is the main variety of cold-rolled and hot-dip galvanized (GI), and is mainly used for automobile and home appliance parts that require high surface quality and stamping performance. Cold-rolled Ti-IF steel is prone to forming grain defects when stamping parts with large deformation. This defect cannot be found in the conventional factory inspection (surface inspection, mechanical properties, roughness, etc.), and the defect can be seen after electrophoresis and painting, which affects the quality of stamping products, especially for automobiles and home appliance outer panels (05). Defects. Contents of the invention [0003] Th...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for controlling the surface forming grain defects of Ti-IF steel, through reasonable matching of chemical composition and rolling process; solve the surface forming grain defects of Ti-IF steel, so that the produced Ti-IF thin plate is Good formability and good surface quality

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