430 stainless steel for cold stamping processing, and manufacturing method thereof

Abstract

The present invention discloses a 430 stainless steel for cold stamping processing, and a manufacturing method thereof. The 430 stainless steel comprises 0.03-0.08 wt% of C, 0-0.85 wt% of Si, 0-0.6 wt% of Mn, 0-0.030 wt% of S, 16.00-18.00 wt% of Cr, 0-0.75 wt% of Ni, 0-0.07 wt% of N, and the balance of Fe and inevitable trace impurities, wherein the trace impurity P content is less than 0.040 wt%. The production method comprises steps such as hot rolling coil annealing, acid washing, cold rolling, finished product annealing, acid washing, temper rolling, and trimming coil cutting, and is characterized in that the hot rolling coil annealing temperature is controlled at 820-860 DEG C, and the thermal insulation time is 10-19 h. Compare with the manufacturing method in the prior art, the manufacturing method of the present invention has the following characteristics that: it can be ensured that the elongation after fracture of the finished product is more than 26%, and the cold stamping molding performance can be ensured.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and relates to a 430 stainless steel suitable for cold stamping with excellent formability and wrinkle resistance and a manufacturing method thereof. Background technique [0002] 430 stainless steel is a general-purpose steel with good corrosion resistance. Its thermal conductivity is better than that of austenite, and its thermal expansion coefficient is smaller than that of 430 stainless steel pipe austenite. 430 stainless steel is used for architectural decoration, fuel burner parts, household appliances, and home appliance parts. Among them, 430 stainless steel has a lower elongation rate than 304 and other austenitic stainless steels and ordinary carbon steels, so the formability is relatively poor; 430 stainless steel has the defect that it is easy to wrinkle during cold rolling, and its polishing performance after processing is relatively poor. The cold stamping process...

AI Technical Summary

Problems solved by technology

Among them, 430 stainless steel has a lower elongation rate than 304 and other austenitic stainless steels and ordinary carbon steels, so the formability is relatively poor; 430 stainless steel has the defect that it is easy to wrinkle during cold rolling, and the polishing performance after processing is relatively poor

The cold stamping process has high requirements on the formability and polishability of stainless steel materials. It is difficult for ordinary 430 stainless steel to meet the high requirements of cold stamping processing. Therefore, in order to make 430 stainless steel meet the high requirements of cold stamping processing Requirements, it is extremely important to further improve its wrinkle resistance and elongation

[0003] In addition, the traditional 430 stainless steel manufacturing method, hot-rolled coil annealing holding time is short, generally 3 to 12 hours, the carbides cannot be fully decomposed; the cold rolling reduction rate is low, generally 40% to 60% During the recovery and recrystallization process of the annealing process, the material cannot get enough power, and the crystallization structure is not perfect.

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