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SS 15 5 PH XM-12

Introducing 15 5PH steel – a testament to strength, durability, and adaptability. Celebrated for its impressive amalgamation of high strength, corrosion resistance, and excellent mechanical properties, this steel alloy, similar to its counterparts 17 4 PH and AISI 630, features a composition comprising approximately 15% chromium, 4% copper, 5% nickel, along with trace amounts of manganese and silicon.

Storage in the H1100 and H1150 states enables use in the low temperature range. Excellent notched impact strength is also given at sub-zero temperatures. Due to its corrosion resistance and good mechanical properties, 15-5 PH XM-12 steel is suitable for use in maritime environments. In stagnant seawater, 15-5 PH is susceptible to stress corrosion cracking but insensitive to intergranular corrosion.

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International identifiers

ASTM A564-89 17-4PH, JIS SCS24 / SUS630, AFNOR Z7CNU15-05 / Z7CNU17-04, 1.4542, 1.4548

Chemical composition

15-5PH C Si Mn P S Cr Mo Ni Cu Nb
min. bis bis bis bis bis 15 bis 3 3.0 5xC
max. 0.07 0.7 1.0 0.04 0.03 17.5 0.6 5 5.0 0.45


The distinctive traits of 15 5 steel XM-12 include its outstanding suitability for low temperatures, serviceability at temperatures up to approximately 315°C, remarkable strength, and toughness. Furthermore, it can undergo age-hardening, and its strength can be further enhanced through cold forming with subsequent aging.


Forging of 15-5PH stainless steel occurs within a temperature range from 1180°C to 950°C, with cooling to room temperature taking place in the surrounding air.


Optimal welding conditions are imperative, taking into account the stable presence of copper in the base material. To prevent stress cracking, the material must undergo solution annealing shortly after welding, followed by aging.

Corrosion resistance

15-5 stainless steel, or AISI 630, is suitable for deployment in marine environments, exhibiting excellent mechanical properties and corrosion resistance. Additional protective measures are necessary against crevice corrosion induced by stagnant seawater.


15-5PH is machinable in both the age-hardened and solution-annealed conditions, with machinability varying depending on the hardness state.

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Popular steel:
17-4ph, xm19