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讨论了马氏体耐热钢Ｆ１２焊缝中δＦｅ的形成及其在高温回火过程中的转变，认为焊缝中的δＦｅ是焊接熔池从液态快速冷却时，由于成分偏析和非平衡凝固等而被保留下来的一个富铬δＦｅ晶核，其在以后的回火处理工序中很难消除。
The formation of δFe in the weld of martensite heat-resistant steel F12 and its transformation during high-temperature tempering are discussed. It is considered that δFe in the weld is due to component segregation and Non-equilibrium solidification, etc. are retained a chromium-rich δ Fe nuclei, which in the subsequent tempering process is difficult to eliminate.