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,THD DINDIN2527DN15 ~ DN1000PN6 ~ PN25BL DN15 ~ DN500PN40 ~ PN100BLDIN2637, DIN2638DN15 ~ DN3500PN6 PN10WN DN15 ~ DN2000PN16 PN25WN DN15 ~ DN500PN40 ~ PN160WNDIN2573DN15 ~ DN500PN6PLDIN2576DN15 ~ DN3000PN10PLDIN2565DN15 ~ ...