A kind of stainless steel material and its manufacturing method

Abstract

Disclosed is a stainless steel material and a manufacturing method therefor. The stainless steel material is a Cr-Mn-N austenitic stainless steel where nickel is replaced by nitrogen. The manufacturing method comprises: a smelting method, a blank stamping method and a machining method. The smelting method mainly consists in the smelting of high nitrogen steel by means of two methods of a solid nitrogen-containing material and gaseous nitrogen for alloying and increasing a nitrogen content. The blank stamping method mainly consists in repeated cycles of blank stamping, thermal treatment, solid solution treatment; the control of heat-preserving temperature and duration, and the selection of moulds mainly takes the hardness and impact toughness values into consideration. The machining mainly comprises the control of the suitable processing parameters for milling and turning operations. The smelting method for the stainless steel material is suitable for the batchwise smelting of high nitrogen steel having a nitrogen content of 0.4 wt%-0.75 wt%; the blank stamping method inhibits the cold-work hardening phenomenon during the processing of high nitrogen steels, and facilitates the stamping of the blank; and the machining method overcomes the problem of high processing difficulty due to the great hardness of high nitrogen steel.

Description

technical field [0001] The invention relates to stainless steel and its smelting and processing methods, more specifically, to a stainless steel material and its manufacturing method. Background technique [0002] 1. Significance of using high nitrogen steel [0003] Stainless steel is a steel that is not easy to rust. The stainless steel and corrosion resistance of stainless steel are due to the chromium-rich oxide film (passive film) on its surface. Because stainless steel has a series of characteristics such as excellent corrosion resistance, formability, compatibility, and strength and toughness in a wide temperature range, it has been widely used in heavy industry, light industry, daily necessities industry, and architectural decoration industries for its excellent characteristics. Applications are 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 and reused....

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 stainless 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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