av免费不卡在线观看网址,黄色视频大全ww,h在线观看网站,亚洲视频在线免费观看,男人天堂视频在线播放,日本女同羞羞视频,jk美女隐私视频网站

Successful Trial Production for Q15MnVB-A at Steel Making Mill
  Updatetime:2017-04-19 Hits:

  A few days ago, the steel making mill successfully produced Q15MnVB-A which is a new grade in advanced product of Xingtai Steel.

  Q15MnVB-A developed by customer’s requirement is a steel grade used for cold heading and cold extruding with boron and low carbon which is used for weld nuts in automobile and strict with quality requirement.

  For quality requirement of grade composition and inclusion, the technical person of steel making mill completely discussed details of grade with main responsibility person of technical center together, such as raw material condition, deoxidation measures, slag-making system and control of chemical composition and arranged tracking and guidance during the production. The finished product satisfied requirement of chemical composition with smooth casting, which marked the trial production for the grade is successful.