17-4 PH is a martensitic precipitation hardening stainless steel with additions of copper (Cu), niobium (Nb) and tantalum (Ta). The grade combines high strength and hardness values with moderate corrosion resistance. Different heat treatment temperatures can optimize mechanical properties, e.g. yield strength at 1100 – 1300MPa. Our stock material is double aged at 1150F – defined as DH1150. Age hardening is can also be performed at 480°C to 620°C in a one-step process, where the lowest temperature gives the highest strength. To achieve good toughness at low temperatures, precipitation-hardening temperatures below 550°C are not recommended.
25.4 - 355.6 mm
16 % at 20 °C
Hardness, Brinell HB
255 [-] at 20 °C
Impact strength, Charpy notched Ivnot
41 kJ/m² at -46 °C
Tensile strength Rm
860 MPa at 20 °C
Yield strength Rp0.2 Rp0.2
725 MPa at 20 °C
15 - 17.5 %
3 - 5 %
3 - 5 %
chemical, petrochemical, paper and general metalworking industries
Solution annealing at 1000 to 1050°C, hardened at 480°C (H900) to 621°C (H1150)
Good, Pre-heating and post-heating practices used for standard hardenable stainless grades are not required.
This material data has been provided by Sverdrup Steel.