不卡视频一区二区三区,婷婷成人av,国产精品一区视频,久久夜色精品国产噜噜av小说,国产精品性夜天天视频,亚洲日产永久经典,九九国产精品入口麻豆

Casus Products>> Casus

  The 30CrMnTi produced by XINGTAI STEEL has the advantages of stable composition, low harmful elements and few surface defects. By controlling the chemical composition and optimizing the rolling process, the product has excellent hardenability. A Southern customer of Xinggang used this product to make bicycle chains,who shows that the product quality can fully meet the needs of users and has won the unanimous praise of customers.