日韩亚洲一区中文字幕在线,黄色视频免费观看网站,9191精品国产免费久久,欧美日韩三四级视频在线观看,亚洲国产成人久久综合碰,国产午夜av毛片久久,真人抽搐一进一出gif免费木瓜视频

Successful Pilot Production of New Grade 30MnVS6 at Steel Making Mill
  Updatetime:2014-03-18 Hits:

  First trial production for new grade 30MnVS6 was successful at steel making mills recently . This grade is specially used to produce automotive steering ball end with big difficult process. Meanwhile, the Controlling for N and S content is key point.

  In order to guarantee successful first production, the mill prepared so much in advance with technical center together, such as off-site inspection, expert advice, special raw material preparation, careful plan and field tracing test. This trial production is successful with fully satisfied chemical content control which gained valuable experience for other grade production with N and S content.