| 摘要 |
The invention relates generally to aluminum containing iron-base alloys useful as electrical resistance heating elements. The aluminum containing iron-base alloys have improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The alloy has an entirely ferritic microstructure which is free of austenite and includes, in weight %, over 4% Al, <=1% Cr and either >=0.05% Zr or ZrO2 stringers extending perpendicular to an exposed surface of the heating element or >=0.1% oxide dispersoid particles. The alloy can contain 14-32% Al, <=2% Ti, <=2% Mo, <=1% Zr, <=1% C, <=0.1% B, <=30% oxide dispersoid and/or electrically insulating or electrically conductive covalent ceramic particles, <=1% rare earth metal, <=1% oxygen, <=3% Cu, balance Fe.
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