Stainless steel material and manufacturing methods thereof

Abstract

The invention discloses a stainless steel material and manufacturing methods thereof. The stainless steel material is Cr-Mn-N austenitic stainless steel with nickel replaced with nitrogen. The manufacturing methods comprise a smelting method, a blank punching method and a machining method. The smelting method mainly comprises the step of smelting high-nitrogen steel through two alloying nitrogen-increasing methods, namely using nitrogen-containing materials and gaseous nitrogen. The blank punching method mainly comprises the steps of conducting circulative blank punching, conducting heat treatment, conducting solid solution treatment, and controlling the heat retention temperature and heat retention time, wherein hardness values and impact toughness values serve as the main reference for die selection. The machining method mainly comprises the steps of controlling appropriate machining parameters of milling and turning. The stainless steel material and the manufacturing methods thereof have the advantages that the stainless steel material is the novel austenitic stainless steel; the smelting method is applicable to batch smelting of the high-nitrogen steel with the nitrogen content ranging from 0.4 wt% to 0.75 wt%; the blank punching method inhibits cold hardening phenomena in the high-nitrogen steel machining process, and blank punching is facilitated; through the machining method, the problem that machining difficulty is large due to high hardness of the high-nitrogen steel is solved.

Description

technical field [0001] The present invention relates to stainless steel and smelting and processing methods, and more particularly, to a stainless steel material and a manufacturing method thereof. Background technique [0002] 1. The significance of using high nitrogen steel [0003] Stainless steel is steel that is not easy to rust, and the rust and corrosion resistance of stainless steel is due to the formation of a chromium-rich oxide film (passivation film) on its surface. Because stainless steel has a series of characteristics such as excellent corrosion resistance, formability, compatibility, and toughness in a wide temperature range, it has been widely used in heavy industry, light industry, daily necessities industry, building decoration and other industries for its excellent characteristics. Applications, not only functional materials, but also modern structural materials. Stainless steel has the advantages of long life cycle and low cost. It can be 100% recycled...

AI Technical Summary

Problems solved by technology

[0022] The second technical problem to be solved by the present invention is to provide a method for smelting high-nitrogen steel in a pressurized induction furnace in view of the defects in the prior art that the smelting of nitrogen-containing stainless steel is difficult and the proportion of nitrogen added in stainless steel cannot meet the design requirements

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