渗氮法 meaning in English

nitration process

What is the most often used heat treatment method ? gas nitriding or acuum nitriding ? post tampering needed ? how many times
冲裁模材料常用的热处理为何？渗氮法？真空渗氮法？之后须回火吗？几次？
What is the most often used heat treatment method ? gas nitriding or vacuum nitriding ? post tampering needed ? how many times
冲裁模材料常用的热处理为何？渗氮法？真空渗氮法？之后须回火吗？几次？