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

40CrMoV4-6 products of  Xingtai Steel is used to product in high strength and high temperature working environment,which used to automotive turbo system and exhaust pipe system bolt.The end user feedback that has heat resistance,good surface quality,good heat treatment and so on.This material was successfully applied to FAW Volkswagen, Chang an,FAIT and so on native and foreign famous automotive company.