Corrosion research is being conducted by the federal Bureau of Mines to determine suitable construction materials for geothermal resource recovery plants. As part of this research, a 30-day stress corrosion test was conducted at the Salton Sea Known Geothermal Resource Area on seven iron- and nickel-base alloys in four brine and steam process streams using well-head brine from geothermal well Magmamax 1. The tests showed transgranular cracking of aisi 316l stainless steel and intergranular and transgranular cracking of aisi 430 stainles steel in all four process streams. E-brite 26-1 exhibited intergranular and transgranular cracking in three of the four process streams. Carbon steel, inconel 625, and hastelloys g and c-276 show no evidence of stress corrosion cracking.