草久久精品,成人久久亚洲,日本一道本在线视频,国产精品99一区二区,一区二区三区综合,久久精品5,自拍偷拍你懂的

Casus Products>> Casus

  The 42CrMoA in xingtai steel production has higher fatigue limit and multiple impact resistance after treatment, generally used in the production of 10.9 and 12.9 high-strength fasteners. Xingang`s  customer using the steel production is used for high-speed locomotive double connecting rod, the customer reflect the material strength, heat resistance, low temperature impact toughness has good performance, well received by customers.