久久久久久国产一区二区三区,天天狠天天操,国产乱码久久久久久一区二区,黄色短视频免费观看,日日噜噜夜夜爽狠狠视频 ,午夜激情啪啪,不卡的av电影在线

Casus Products>> Casus

  The 42CrMo produced by XINGTAI STEEL has characteristics of stable chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality. It is generally used to produce high strength fasteners of grades 10.9 and 12.9. A customer of XINGTAI STEEL used this steel to produce the ball pin for automobiles. The customer reflected that the product had high strength, low cracking rate in cold heading and met the requirements of the product.