15-5ph Stainless Steel

We are Asia Metal supplier with full range of Stainless Steel sheets, stainless steel round bar , stainless steel rod, stainless steel plate,  300 Series stainless steel , 400 series stainless steel , 253ma, f6nm, sus301, sus303, sus304, sus304l, sus309,  sus310, sus310s, sus316, sus316l, sus316ti, sus317, sus321, sus347, sus403 , sus409, sus410 , sus416, sus420, sus420j2, sus430, sus430f, sus431 , sus440c , sus630 , 904L 17-4PH, s31803 , s32750 , s32760, s31254, s329j4l, Nitronic30, Nitronic50 , Nictronic60, Ferralium 255


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15 – 5 PH® Stainless Steel , UNS S15500, XM-12

Stainless steel 15-5 PH, also known as UNS S15500 or XM-12, is a modification of 17-4 PH developed in the 60’s. UNS S15500 stainless steel has a more refined microstructure as a result of the remelting process in which it was developed. This refined structure enhances toughness, especially in the transverse direction of the material. 15-5PH also has excellent corrosion resistance, good fabricating characteristics and low temperature hardening which makes Stainless Steel 15.5 PH the preferred alloy for many industries.

The composition of 15/5PH includes small amounts of carbon, manganese, phosphorus, columbium (or niobium), tantalum, silicon and sulfur. 15/5 PH can be forged, welded and formed. Machining may be performed in the solution-annealed state or in the final heat treat condition. Desired mechanical properties such as ductility and strength can be achieved through heating the material at various temperatures.

UNS S15500 is a martensitic precipitation hardening grade. Martensitic stainless steels were designed as a type of alloy which is corrosion resistant and could also be hardened through heat treatment.


Chemical Composition

Element Content (%)
Iron, Fe 75
Chromium, Cr 14.48
Nickel, Ni 4.5
Copper, Cu 3.5
Manganese, Mn ≤1
Silicon, Si ≤1
Nb + Ta 0.3
Carbon, C ≤0.07
Phosphorous, P ≤0.04
Sulfur, S ≤0.03




  • 15-5 PH Mechanical Properties
Condition Ultimate Tensile Strenght Yield Strength Elongation Reduction of Area Hardness Brinell Hardness Rockwell
H900 190,000 170,000 6 15 388 C40
H1025 155,000 125,000 8 27 331 C35
H1075 145,000 125,000 9 28 311 C32
H1150 135,000 105,000 11 30 277 C28
H1150-M 115,000 75,000 14 35 255


Industries that use 15.5PH include:

  • Aerospace , Chemical, Food processing, General metal working,  Paper industries,  Petrochemical.

Products partially or completely constructed of 15-5PH include:

  • Aircraft components, Cylinders,  Engine parts, Fittings, Gears, Hallow shafts, Marine gas turbine, compressor sections, Paper mill equipment, Shafts, Valves.