Abstract:

This paper introduced the Super304H steel tube’s production situation at home and abroad in ultra supercritical units, and analyzed the quality situation of domestic Super304H steel tube including chemical composition； mechanical property； metallographic characteristics. The investigation results show that many manufacturers in China have the production capacity of Super304H steel tube at present. Compared with imported Super304H steel tubes, the domestic ones have difference in some indicators, but have been able to meet the requirements of relevant standards. The domestic Super304H steel tubes have been applied in ultra supercritical units in China, whose operation should be under strengthened supervision.

Key words: ultra supercritical unit, Super304H steel tube, localization, chemical composition, mechanical property, metallographic characteristics