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Development of Low-Nickel Superalloys for Exhaust Valves
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English
Abstract
Honda has developed, in collaboration with Hitachi Metals and Daido Steel, two types of low-nickel heat-resistant alloys for exhaust valves which are more cost effective than the conventional nickel alloys. They are NCF4015 that contains approximately 40% nickel and NCF3015 with approximately 30% nickel content. The two types of new alloys were developed based on our unique alloy design concept. Both alloys feature superb high-temperature strength and are capable of maintaining favorable material properties, even after an high-temperature exposure. The NCF4015 is compatible with the conventional Inconel 751 and 60Ni alloys in terms of high-temperature strength. The NCF3015 falls slightly behind the two metals, but overwhelms the 21-4N (SUH35) in high-temperature strength. The exhaust valves made of the two alloys developed have been used for mass production engines.
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Citation
Sato, K., Saka, T., Ohno, T., Kageyama, K. et al., "Development of Low-Nickel Superalloys for Exhaust Valves," SAE Technical Paper 980703, 1998, https://doi.org/10.4271/980703.Also In
References
- Rivin V.G. International Metals Reviews 1981 5 269
- SuperalloysII Cims C.T. et al 1987 John Wiley & Sons 109