AIST Steel Glossary
AIST Steel Glossary. 177: Term normally used for 177PH™1 precipitation hardenable stainless steel. However, whenever it is used by a potential customer, it should be clarified that they mean 177PH™1. In the past, 177 has been used to signify type 301 which also is 17% Chromium 7% Nickel stainless steel, but not precipitation hardenable.