ʻO 15-5 PH ke kila kila he martensitic precipitation-hardening stainless steel me kahi o 15% Chromium a me 5% Nickel. Loaʻa iā ia ka ikaika kiʻekiʻe, ka paʻakikī kiʻekiʻe, a me ke kūpaʻa corrosion maikaʻi loa. Hiki ke hoʻonui hou ʻia ka ikaika e ka mālama wela haʻahaʻa hoʻokahi. Ke hoʻohālikelike ʻia me 17-4 PH, hāʻawi ia i ka ʻoi aku ka paʻakikī transverse a me ka ductility; ʻoi aku ka maikaʻi o nā waiwai mechanical i nā ʻāpana keʻa nui aʻe, a ʻoi aku ka maikaʻi o ka forgeability. Hiki ke weldable. Hiki ke hana ʻia i loko o kekahi o nā Kūlana Thermal i loaʻa i kēia papa.