15-5 bakin karfe shine martensitic, hazo-hardening abu tare da chromium, nickel da jan karfe. Yawancin lokaci shine zaɓi na farko a cikin masana'antar sararin samaniya don masu ɗaurewa da kayan haɗin ginin. Tsarinsa na musamman yana ba da ƙarin ƙarfi da mafi kyawun juriya na lalata fiye da wanda ya riga shi, 17-4 PH. Duka ikon haɗawa da ƙaramin adadin delta ferrite idan aka kwatanta da bakin karfe 17-4 suna ba da gudummawa ga mafi girman taurin 15-5. Ana ƙara ƙarfafa gabobin ta hanyar maganin zafi mai ƙarancin zafin jiki wanda ke haifar da lokaci mai ɗauke da jan ƙarfe a cikin gami. 15-5 PH yana iya saduwa da ƙaƙƙarfan kayan aikin injiniya da ake buƙata a cikin sararin samaniya da masana'antar nukiliya.

15-5 PH Chemical Haɗin Kai

	Abun ciki	Kashi na Nauyi
C	Carbon	0.07 mafi girma
Cr	Chromium	14 - 15.5
Cu	Copper	2.5 - 4.5
Fe	Iron	Ma'auni
Si	Siliki	1.00 mafi girma
S	Sulfur	0.03 mafi girma
Ni	Nickel	3.5 - 5.5
Mn	Manganese	1.0 mafi girma
P	Phosphorus	0.04 mafi girma
Nb Ta	Niobium da Tantalum	0.15 - 0.45