1. ISO 9001, ISO14001, OHSAS 18001, CE certification. 2. Seamless type: OD 6 to 273mm, thickness 0.8 ... , cryogenic process (air separation plant), LNG plant; C and KY series mainly use for concentrated & dilute nitric acid plant, 316MOD Urea ... /ASTM standard, Europe standard (EN) and Germany standard (DIN).1. Certification: CE, ISO 9001, ISO14001, OHSAS 18001.2. Material grade: 304L, 316L ...