The main steel: 1Cr18Ni9 1Cr19Ni9 (TP304H), 310H, 321H, 1Cr19Ni11Nb (TP347H), etc.
Production standards: GB5310-1995 "high-pressure boiler seamless pan pipe", GB13296-2007 "boilers, hot pot Used stainless steel seamless pipe", ASME SA213 / SA213M "boiler, superheater and heat exchanger seamless ferritic and austenitic steel boiler tubes "