17-4PH shine chromium-nickel-Copper hazo hardening martensitic bakin karfe. Wannan nau'in nau'in bakin karfe yana da ƙarfin ƙarfi, taurin kai da juriya na lalata. Ana inganta kaddarorin injina ta hanyar zafi Za a iya samun karfin jiyya da matsa lamba har zuwa 1100-1300 MPa (160-190 ksi). Ba za a iya amfani da wannan darajar a yanayin zafi sama da 300°C (572°F) ko kuma a ƙananan zafin jiki ba. Yana da kyakkyawan juriyar lalata ga yanayi da tsarma acid ko gishiri, kuma juriyar lalatarsa ​​yayi daidai da na 304.

17-7PH ne austenitic-martensitic hazo hardening bakin karfe ɓullo da bisa 18-8CrNi, kuma aka sani da sarrafawa lokaci canji bakin karfe. 17-7PH bakin karfe ne m austenitic kungiyar bayan m bayani Jiyya, tare da mai kyau filastik taurin da machinability, bayan tempering, sabõda haka, austenite hazo na carbides bayan da canji a cikin abun da ke ciki, sa'an nan ta hanyar martensitic canji tsari, mafi yawan kungiyar da aka canza zuwa wani low carbon tempering tsari da kyau tauri. Bayan tempering, austenite hazo carbide abun da ke ciki ya canza, sa'an nan ta hanyar martensitic canji tsari, mafi yawan kungiyar da aka canza zuwa wani low carbon tempered martensite da kyau tauri, kuma yana da kyau inji Properties a matsakaici zazzabi. 17-7PH lalata juriya ne mafi alhẽri daga general martensitic bakin karfe.