av无码网址福利_超碰aⅴ亚洲中文字幕_亚洲三级片区无码_亚洲欧洲无码精品Ⅴa

　　The material Q10B21 which is produced by XINGTAI IRON AND STEEL CORP., LTD    mainly used to produce 8.8 level fasteners. Currently a lot of foreign fastener manufactures use this material in the production of passenger car fasteners.Q10B21-C has acquired the certification of joint owners factory and stable supply to the factory.Customers reflected that the Q10B21-C material with a stable composition,Uniform microstructure,Low inclusion content,Good hardenability.