Pitting of 301 and 17-4PH Stainless Steel
Pitting of 301 and 17-4PH Stainless Steel
(OP)
Does anyone have information regarding the pitting resistance of 301 half hard SST, 301 High Yield SST and 17-4PH Stainless Steel in a high chloride concentration?





RE: Pitting of 301 and 17-4PH Stainless Steel
RE: Pitting of 301 and 17-4PH Stainless Steel
Resistance to pitting in stainlesses is proportional to
(%chromium + 3.3X%molybdenum + 13x%nitrogen). Both 17-4 and 301 have about 17% chromium and no molybdenum, so their pitting resistance is equivalent.
These materials are also susceptible to stress corrosion cracking. Consider an high strength, high corrosion resistant duplex like 2205,
RE: Pitting of 301 and 17-4PH Stainless Steel
2205 has excellent corrosion resistance, but can it replace the materials mentioned in the original post? 2205 yield strength is ~ 450 - 600 MPa, while 301 half-hard is ~ 760 MPa, 301 full-hard is ~ 965 MPa, and 17-4 can be up to 1170 MPa. If the application requires high strength, 2205 would be unsuitable.
RE: Pitting of 301 and 17-4PH Stainless Steel
Your point is well taken, however. I failed to cite its lower yield strength originally.