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 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.