Stress corrosion cracking (SCC) is one of the most serious corrosion problems in chemical process industries. Standard 300 series austenitic stainless steels are most widely used, but much susceptible to SCC in chloride containing environments, whereas ferritic ones are poor in ductility and toughness, although they have high resistance to SCC. A powder mixed duplex stainless steel (P/M alloy) of Type 316L and Type 444 which possesses both excellent SCC resistance and toughness offering considerable cost savings has been developed. The corrosion resistance of the base metal and the weldment of the P/M alloy tube was presented. The base metal exhibited outstanding SCC resistance in boiling 42% MgCl2 solution and neutral chloride environments at elevated temperature. The weldment of the P/M alloy had also remarkably high resistance to SCC compared to Type 316L, although it suffered cracking in the combination of high tensile stress in excess of the 0.2% proof strength and severe environmental condition such as boiling 42% MgCl2 solution. The electrochemical measurements indicated that the resistance to pitting corrosion of the P/M alloy is equivalent to those of 316L and 444 stainless steels.

Subject
Stainless alloys, Nickel based alloys, Tubes, Powders, Pitting, Corrosion resistance, Duplex stainless steel, Stainless steel, Nickel, Chlorides, Toughness, Stress corrosion cracking, Chloride stress corrosion cracking
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1989
Association for Materials Protection and Performance (AMPP)
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