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P/M Alloy 625 provides specific advantages for critical service oil and gas industry parts. In this study, two P/M versions were compared with cast and wrought 625 when processed as redraw stock for welding wire. A modified P/M 625 with 11 MO-0.1 Fe-0.005C is especially suited for overlay-cladding of 4130 steel valve bodies. The low Fe content provides for the dilution of Fe from the steel during welding and the higher MO content improves the pitting resistance of the 625 overlay. A refined grain size with no precipitation of carbides was observed and tensile properties met requirements. Best corrosion resistance was obtained in 10 pet FeC13 l 6H2O solution and in a simulated oil and gas environment. No cracking was observed in any of the U-bend specimens exposed for 14 days at 232°C (450°F) in a solution containing 25 pet NaCl, 0.5 pet acetic acid and 1 g/l sulfur, pressurized with 100 psi H2S. Microscopic examination of autogenous welds revealed that the grain size of the CW Alloy 625, in the base metal, was five times larger than the P/M versions. The grain size of the high Mo-low C P/M version was larger than that of the conventional P/M Alloy 625 because of formation of small carbides in the latter which restricted grain growth.

P/M Alloy 625 Special Composition for Redraw-Stock Welding Wire