随着国内外9-10%Cr铁素体-马氏体钢不断发展，25 MPa/600℃/600℃型超超临界机组已日趋成熟，适用于更高参数机组的材料仍在持续不断地开发。在欧洲COST522研发计划中开发出来的在原9-10%Cr钢的基础上添加Co和B元素，同时去掉W，得到的新铁素体不锈钢COST FB2在620℃下100000 h的持久强度≥100 MPa。文章通过对FB2材料的性能及长时蠕变时效后微观组织的研究，确认其适用于公司620℃超超临界火电站高中压转子。%With the development of the 9-10%Cr ferritic/martensitic steel,the ultra-supercritical fossil fired steam power plant which parameter reached 25 MPa/600℃/600℃has beening mature. The material is still researched to apply the higher parameter steam tur⁃bine. In Europe,a new steel named FB2 has been obtained through adding Co&B and removing W based on the general 9-10%Cr fer⁃ritic/martensitic steel by the COST522 plan. The 100 000 hour creep rupture strength of FB2 at the 620℃shall be exceed 100 MPa. This paper will discuss the property of FB2 steel and research the microstructure after the long time creep test. It’s sure that this materi⁃al can be used for the rotor of the ultra-supercritical steam turbine at 620℃by our company.
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