I-15-5 PH insimbi engenasici i-martensitic precipitation-hardening steel stainless steel malunga ne-15% yeChromium kunye ne-5% yeNickel. Inamandla amakhulu, ubunzima obuphezulu, kunye nokumelana nokugqwesa okugqwesileyo. Amandla anokongezwa ngakumbi ngonyango olulodwa lobushushu obuphantsi. Xa kuthelekiswa ne-17-4 PH, inika ukuqina okungcono kunye ne-ductility; iipropathi ezingcono zoomatshini kwiindawo ezinkulu ezinqamlezileyo, kunye nokuqiniswa okungcono. Ikwazi ukuwelda ngokulula. Ingenziwa ngoomatshini kuyo nayiphi na iMiqathango yeThermal ekhoyo kweli bakala.