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双相不锈钢是基于石油化工行业中强酸强碱易造成局部点蚀、应力腐蚀以及孔穴腐蚀现象,采用一般不锈钢难以胜任而研制开发的。双相不锈钢具有奥氏体和铁素体混合组织,奥氏体的存在降低了高铬铁素体的脆性、氢脆和晶粒长大倾向,提高了可焊性和韧度。而富铬铁素体则又提高了奥氏体的屈服强度、抗晶间腐蚀和应力腐蚀能力[1~2]。因其
Duplex stainless steel is based on strong acid and alkali in the petrochemical industry can easily lead to local pitting corrosion, stress corrosion and hole corrosion phenomenon, the use of stainless steel is generally difficult to research and development. Duplex stainless steel has a combination of austenite and ferrite, the presence of austenite reduces the brittleness of high chromium ferrites, hydrogen embrittlement and grain growth tend to improve the weldability and toughness. Rich chromium ferrite increases the yield strength of austenite, intergranular corrosion resistance and stress corrosion resistance [1 ~ 2]. Because of it