Heat resisting alloys

Details Heat resisting alloys Heat resisting alloys

1995-06-06

1996-10-22

Yee, Deborah

Alloys or metallic compositions

Containing over 50 per cent metal but no base metal

Iron containing

420586, C22C 3000

Patent

active

055673830

ABSTRACT:
A heat resisting alloy for use in exhaust valves and the like low in price and excellent in structural stability, high-temperature strength and hot workability, which consists essentially by weight percentage of C: 0.01.about.0.10%, Si.ltoreq.2.0%, Mn.ltoreq.2.0%, Cr: 14.about.20%, Nb+Ta: 0.3.about.1.5%, Ti: 1.5.about.3.5%, Al: 0.5.about.1.5%, Ni+Co: 35.about.45%, B: 0.001.about.0.01%, one or both of Ca: 0.001.about.0.03% and Mg: 0,001.about.0.03%, and the balance of Fe, additionally the total atomic percentage of Al, Ti, Nb, and Ta: 4.5.about.6.0%, an atomic percentage ratio of Ti/Al: 1.0.about.2.0, and M-value obtained through the following equation.ltoreq.0.925;
M=0.717 Ni (atomic fraction)+0.858 Fe (atomic fraction)+1.142 Cr (atomic fraction)+1.90 Al (atomic fraction)+2.271 Ti (atomic fraction)+2.117 Nb (atomic fraction)+1.001 Mn (atomic fraction)+1.90 Si (atomic fraction)+0.777 Co (atomic fraction)+2.224 Ta (atomic fraction).

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