Low nickle type austenitic stainless steel and manufacturing method thereof

Abstract

The invention provides a low-nickel type austenitic stainless steel which comprises the following chemical elements: 0.04 to 0.07 percent of C, 0.2 to 0.6 percent of Si, 5.5 to 7.5 percent of Mn, 15.5 to 16.5 percent of Cr, 3.0 to 4.5 percent of Ni, 0.05 to 0.15 percent of N, 1.5 to 2.0 percent of Cu, less than or equal to 0.040 percent of P, less than or equal to 0.008 percent of S, the balance being Fe and inevitable impurity elements. The invention also provides a method for manufacturing the low-nickel type austenitic stainless steel. The low-nickel type austenitic stainless steel can not produce the disadvantage of edge crack in hot rolling and has certain corrosion resistance.

Description

technical field [0001] The invention belongs to the field of alloys. Specifically, the invention relates to stainless steel. More specifically, the invention relates to austenitic stainless steel in the product industries of civil kitchen and bathroom, hardware and the like. Background technique [0002] In recent years, with the continuous improvement of people's living standards, stainless steel materials have been favored by more and more people. Among them, austenitic stainless steel is very popular and more widely used because of its unique corrosion resistance, easy processing and beautiful appearance. It is used in industries such as household appliances, kitchen and bathroom products, and hardware. In order to obtain a stable austenitic structure, a large amount of precious metal element nickel must be added to austenitic stainless steel, and nickel is a very scarce strategic resource in the world at present. The demand for austenitic stainless steel has increased, ...

AI Technical Summary

Problems solved by technology

[0007] Both of the above two patent documents belong to low-nickel austenitic stainless steel. The former emphasizes corrosion resistance, but neither involves the change of phase ratio due to the reduction of nickel content, and the resulting common problems in the production process of hot processing Edge crack defects also affect the rolling yield

The latter emphasizes antibacterial properties, lowering the corrosion resistance elements to avoid the problem of thermal sensitivity. Although the addition of copper improves the antibacterial properties of the material, it reduces the corrosion resistance of the material due to the reduction of Cr and N content.

Images