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1.概论按照毛主席“中国人民有志气,有能力,一定要在不远的将来,赶上和超过世界先进水平”的伟大教导,根据设计的需要,在有关单位协作下研制了一种新型半奥氏体沉淀硬化不锈钢 Cr_(12)Mn_5Ni_4Mo_3Al(曾用代号69111)。这种钢在固溶状态下主要为奥氏体组织(另含有5～20%的铁素体),因此易于加工成形。随后经冰冷处理,使其转变为马氏体组织,强度显著提高;再经时效处理进一步强化,此时室温强度可达160公斤/毫米~2左右,500℃瞬时强度可达100公斤/毫米~2左右。也可采用冷加工及时效获得所需的性能。这种钢的性能可与美国同类钢中具代表性的PH15—7Mo 不锈钢相比,而钢中所用镍、
1. Introduction According to Chairman Mao’s great teaching of “Chinese people have ambition, ability and must catch up with and surpass advanced world level in the near future”, according to the needs of design, a new type Semi austenitic precipitation hardening stainless steel Cr_ (12) Mn_5Ni_4Mo_3Al (former code 69111). This steel in the solution state is mainly austenitic (the other contains 5 to 20% of ferrite), so easy to shape. Followed by ice-cold treatment, so that it is transformed into martensite, the strength was significantly increased; and then further strengthened by aging treatment, the room temperature strength up to about 160 kg / mm ~ 2, 500 ℃ instantaneous strength of up to 100 kg / mm ~ 2 or so. Cold processing and aging can also be used to obtain the required performance. The performance of this steel can be compared with the typical PH15-7Mo stainless steel of the same type in the United States, while the nickel,