15-5PH is a Precipitation Hardening Martensitic Stainless steel with an addition of Nb/Cu elements. Grade S15500 Combines High Strength, hardness (up to HRC40), and corrosion resistance. Mechanical properties at RM can be optimized with final age treatment.

CHEMICAL COMPOSITION (Mass weight - %)
C (％):  ≤ 0.07, Si (％):  ≤ 1.00, Mn (％):  ≤ 1.00
P (％)≤: 0.040, S (％)≤:  0.030
Cr (％):  14.0 ~ 15.5, Ni (％):  3.50 ~ 5.50, Mo (％):  -
Cu (％):  2.50 ~ 4.50, Nb+Ta (%):  0.15 ~ 0.45

MECHANICAL PROPERTIES UNDER FINAL HEAT TREATMENT   
Form: Bar, forge piece
Condition: H900
Tensile strength, σb/MPa: 1310
Yield strength, σ0.2/MPa: 1170
Elongation, δ (％):  10.0
Reduction of area, ψ (％):  35
Harndess: HRC: ≥ 40
Form: Bar, forge piece
Condition: H925
σb/MPa:    1170
σ0.2/MPa: 1070
δ (％):    L-10.0
ψ (％):    L-38.0
Hardness HRC: ≥ 38
Form: Bar, forge piece
Condition: H1025
σb/MPa:    1070
σ0.2/MPa:  1000
δ (％):    12.0
ψ (％):    45
Hardness HRC: ≥ 35
Form: Bar, forge piece
Condition: H1075
σb/MPa:    1000
σ0.2/MPa:  860
δ (％):    13.0
ψ (％):    45.0
Hardness HRC: ≥32
Form: Bar, forge piece
Condition: H1100
σb/MPa:    965
σ0.2/MPa:    795
δ(％):    14；10
ψ(％):    45；29
HRC:    ≥31