What is the most often used heat treatment method? Gas nitriding or vacuum nitriding? Post tampering needed? How many times?

 
  • 沖裁模材料常用的熱處理為何?滲氮法?真空滲氮法?之后須回火嗎?幾次?
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan