... .Process:Drop forging, heat-treatment, galvanized 4.TS16949;ISO9001 TS16949 Carbon steel galvanized Forged Nut for ConstructionAbout Zhongsheng:Rizhao ... : S355, C22, 16Mn, 20Mn, 42CrMo, F3042) Forged pipe fittings: SA106 CL B, SA 106 CL C, WB36, ... SparesGeneral Engineering ComponentsOur productsToolingEquipmentInspectionOur certificatePackage TS16949 galvanized Carbon steel Forged Nut for Construction