ISO9001-2008 have be passed. Carbon Steel and Stainless Steel. casting or forged StandardSizePNTypeANSIANSI ASTM B16.51/2" ~ 24"150LBS ~ 2500LBSBL,SO,SW,LJ,WN ... ,133,134UNI2277-2278DN15 ~ DN1000PN10 PN16PL Material: Carbon Steel - A105, C22.8, ST37.2, Q235, P245GH Stainless Steel - A304, 304L, 316, 316LCoating: Black Painting ...