ʻO 15-5 ke kila kila he martensitic, paʻakikī paʻakikī me ka chromium, nickel a me ke keleawe. He mea koho mua ia ma ka ʻoihana aerospace no nā mea hoʻopaʻa a me nā mea hana. Hāʻawi kona ʻano ʻokoʻa i ka paʻakikī a ʻoi aku ka maikaʻi o ka corrosion ma mua o kona mua, 17-4 PH. ʻO ka mana hoʻohui ʻelua a me ka liʻiliʻi o ka delta ferrite i hoʻohālikelike ʻia me 17-4 stainless steel e kōkua i ka paʻakikī o 15-5. Hoʻoikaika hou ʻia ka huila e kahi mālama wela haʻahaʻa e hoʻoheheʻe i kahi keleawe i loko o ka ʻāpana. Hiki iā 15-5 PH ke hoʻokō i nā waiwai mechanical stringent i koi ʻia i nā ʻoihana aerospace a me nā ʻoihana nuklea.

15-5 PH Hoʻohui Kimia

	ʻElemu	Paneka ma ke Kaumaha
C	Kalapona	0.07 ka nui
Cr	Chromium	14 – 15.5
Cu	keleawe	2.5 – 4.5
Fe	Hao	Kaulike
Si	Silika	1.00 ka nui
S	Sulfur	0.03 ka nui
Ni	Nikela	3.5 – 5.5
Mn	Manganese	1.0 kiʻekiʻe
P	Phosphorus	0.04 ka nui
Nb Ta	ʻO Niobium me Tantalum	0.15 – 0.45