国产精品久久久久久久久久免费动|久久久久免费精品国产|日日夜精品视频|黄色av地址,婷婷激情久久,亚洲美女高潮久久久,超碰在线三级

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.