免费在线看黄网址|av不卡免费看|日韩一二三四五区|国产日韩在线不卡,亚洲午夜激情网,国产自一区,啊啊啊国产

Casus Products>> Casus

  The QB30 produced by XINGTAI STEEL has the advantages of stable chemical composition, high surface quality, small decarburization layer and high steel purity. A customer of Xinggang used this product to produce 10.9 grade high strength bolts for engines to replace the imported materials from Germany. The customer said that the QB30 of XINGTAI STEEL was stable in quality and met the requirements of use.