日本中出在线观看,日韩亚洲精品视频,欧美成人三级精品,一区二三区视频电影,日本伊人色综合网,三级全黄的视频在线观看,三级全黄的视频在线观看

Casus Products>> Casus

  The 60Si2MnA spring steel is a medium and high carbon alloy steel with the characteristics of high fatigue limit, large hardenability and excellent plasticity, which is widely used in the fields of high-speed rail and automobile. A customer of XINGTAI STEEL used the product to make high-speed rail fastener elastic strips. The customer reflected that 60Si2MNA has the advantages of surface quality and high batch life.