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日本大同钢铁有限公司和富士阀门公司联合研究了一种新的铁基奥氏体合金RS914,可作强载柴油机排气阀。同镍基合金Inconel 751相比其价格较低。合金成份:Ni—40.0％,Cr—19.0％,Ti—2.75％,Al—0.65％,Fe—余量。加入元素Ti和Al在于提高合金的韧性。γ精敷镀后,RS914的硬度提高,因此阀盘密封面可不另加涂层。阀杆用马氏耐热钢SUH制成,其成份是:C—0.4％,Si—2.2％,Cr—11％,Mo—1％,Fe—余量。阀盘和阀杆摩擦焊接,然后进行热加工和机加工,最后阀杆再硬化处理。在温度高达800℃时合金RS914的硬度仍很高,所以耐久
Japan’s Datong Iron & Steel Co., Ltd. and Fuji Valve Co., Ltd. jointly studied a new iron-based austenitic alloy RS914, can be used as a strong diesel exhaust valve. Its price is lower than nickel-based Inconel 751. Alloy composition: Ni-40.0%, Cr-19.0%, Ti-2.75%, Al-0.65%, Fe-balance. Adding elements Ti and Al is to improve the toughness of the alloy. After γ fine coating, RS914 hardness increases, so the valve disc sealing surface without additional coating. The stem is made of Markov heat-resisting steel SUH and has the composition of C-0.4%, Si-2.2%, Cr-11%, Mo-1%, Fe-balance. Valve disc and stem friction welding, and then hot and machining, the last valve stem and then hardened. The hardness of the alloy RS914 is still high at temperatures up to 800 ° C, so it is durable