17-4PH he chromium-nickel-copper precipitation hardening martensitic stainless steel. Hōʻike ʻia kēia ʻano o ke kila kila e ka ikaika kiʻekiʻe, ka paʻakikī a me ka pale ʻana i ka corrosion. Hoʻomaikaʻi ʻia nā waiwai mechanical e ka wela Hoʻomaʻamaʻa a me nā ikaika compressive a hiki i 1100-1300 MPa (160-190 ksi) hiki ke hoʻokō. ʻAʻole hiki ke hoʻohana ʻia kēia māka ma nā wela ma luna o 300°C (572°F) a i ʻole ma nā wela haʻahaʻa loa. Loaʻa iā ia ke kūpaʻa corrosion maikaʻi i ka lewa a me ka dilute acid a i ʻole nā ​​paʻakai, a ua hoʻohālikelike ʻia kona kūpaʻa corrosion me ka 304.

ʻO 17-7PH ka austenitic-martensitic precipitation hardening stainless steel i hoʻomohala ʻia ma ke kumu o 18-8CrNi, i ʻike ʻia hoʻi ʻo ke kila kila kila. 17-7PH kuhiliʻole kila he unstable austenitic hui ma hope paʻa hoʻoponopono lapaʻau, me ka maikai plastic toughness a me ka machinability, ma hope o tempering, no laila, i ka austenite precipitation o carbide ma hope o ka hoʻololi 'ana i ka haku mele 'ana, a laila ma o ka martensitic hoʻololi kaʻina hana, ka hapanui o ka hui ua hoʻololi 'ia i ka haʻahaʻa kalapona tempering kaʻina hana me ka maikai toughness. Ma hope o ka tempering, hoʻololi ka austenite precipitation carbide haku mele, a laila ma o ke kaʻina hana hoʻololi martensitic, ua hoʻololi ʻia ka hapa nui o ka hui i kahi martensite haʻahaʻa haʻahaʻa haʻahaʻa me ka paʻakikī maikaʻi, a loaʻa iā ia nā waiwai mechanical maikaʻi ma ka mahana wela. ʻOi aku ka maikaʻi o ka pale ʻana i ka corrosion 17-7PH ma mua o ke kila kila martensitic maʻamau.