620~650℃锅炉过热器/再热器用新型奥氏体耐热钢SP2215的研发

R & D of the New Type SP2215 Austenitic Heat-resistant Steel for Servicing 620~650 ℃ Boiler Super Heater/Reheater

摘要: 介绍TP347H、Super304H、HR3C超超临界电站锅炉材料的时效析出强化机理，并在此基础上研发出620～650℃锅炉过热器/再热器用新型奥氏体耐热钢SP2215。分析认为：以22Cr-15Ni为基的Fe-Cr-Ni新型奥氏体耐热钢SP2215，通过加入一定量的Cu、Nb、N，在基体中形成多相复合强化，并在晶界形成M₂₃C₆碳化物强化。SP2215具有高的持久强度（650℃，10⁵ h∧130 MPa；700℃，10⁵ h∧80 MPa）和良好的抗腐蚀/氧化性能。

Abstract: Analyzed in the paper is the aging-precipitation strengthening mechanism of the material as used to make the TP347H,Super304H,and HR3C ultra supercritical boilers for power plant service,based on which,the new type SP2215 austenitic heat-resistant steel for servicing 620~650℃ boiler super heater/reheater is developed.It is identified via relevant analysis that adding certain amounts of Cu,Nb and N to the new type 22Cr-15Ni-based Fe-Cr-Ni SP2215 austenitic heat-resistant steel leads to producing the multi-phase composite strengthening effect,and M₂₃C₆ carbide strengthening in grain boundary.The said SP2215 steel is in possession of high creep rupture strength(650℃,10⁵ h＞130 MPa;700℃,10⁵ h＞80 MPa) and satisfactory corrosion/oxidation-resistance.