久久中文字幕一区二区三区,日本99热,高清av一区,日韩狠狠操,久久久一本精品99久久精品66,1级片网站,aaaaaaa欧美黄色大片

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.