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化学工业、电力、石油等的各种机械设备所使用的高温高压阀门密封面,原来进行Co-Cr-W-C系的钴基合金的表面硬化(AWS规格:CoCr-A、B、C)。但近年来,在原子能工厂中。由于担心Co_(60)对环境污染,开始限制使用Co基合金,且Co价猛涨,因而强烈期望研制出不含Co的新的表面硬化材料。作为不含Co的新表面硬化材料有Ni-Cr-B系的Ni基合金(AWS规格:NiCr-A、B、C),这种用于阀门的Ni基合金,表面硬化材料的特性是良好的,但在抗冲击方面比Co基合金差。为此,Ni基合金不能用作高温高压阀门的表面硬化材料的代用品。
The high temperature and high pressure valve sealing surfaces used in various machinery and equipment such as chemical industry, electric power, oil and the like were originally subjected to surface hardening of Co-Cr-W-C based cobalt-based alloys (AWS Specifications: CoCr-A, B, C). But in recent years, in atomic power plants. Due to concerns about the environmental pollution of Co 60, restrictions on the use of Co-based alloys and the surging price of Co have led to a strong desire to develop new hardfacing materials that do not contain Co. Ni-Cr-B-based Ni-based alloys (AWS specifications: NiCr-A, B, C) as new hardfacing materials containing no Co are excellent in properties of the Ni-based alloy for the valve and the surface hardened material But less than Co-based alloys in terms of impact resistance. To this end, Ni-based alloy can not be used as high temperature high pressure valve surface hardening material substitutes.