MATERIALS RESEARCH AND EVALUATION FOR GEOTHERMAL CORROSION ENVIRONMENTS Progress Report for Period December 15, 1975 - December 15, 1976

摘要

In terms of stress corrosion cracking resistance in sour brines, a recently developed modified 4135 steel has exhibited a design yield strength advantage of approximately 10,000 psi over the standard 4130 (Y.S.=110,000 psi) widely employed for casing, production tubing, etc.nFor a specified strength level, resistance to SCC is improved by higher tempering temperatures in heat treating, giving rise to an approach to new alloy design for construc¬tional type steels. Preliminary results indicate that im¬provements over the modified 4135 can be achieved.nIncreasing test temperature reduces the susceptibility to SSC in the constructional steels thus moderately raising the useful strength level;but immunity cannot be achieved. On the other hand, susceptibility of the highly alloyed ma¬terials increases with increasing temperature, at least up to 425°F.