Abstract
High nitrogen stainless steels with excellent mechanical and corrosion resistance properties is focused on to develop a new class of engineering material. The manufacture process of high nitrogen stainless steels under high nitrogen pressure is complicated. There are some theoretical problems to be solved for large scale melting and cast high nitrogen stainless steels. The thermodynamic calculation models of nitrogen solubility in the liquid phase, δ ferrite phase and γ austenitic phase built can well predict the nitrogen solubility and analyze the effect of temperature, alloy components and nitrogen pressure on the nitrogen solubility. The minimum nitrogen pressure for preventing the nitrogen porosity formation has been calculated by the micro-segregation. By the analysis nitrogen behavior of melting and cast high nitrogen stainless steels, it is possible to produce high nitrogen stainless steels in a large scale in China.
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