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17-4 PH DH1150 Bar

Alternative and trade names
EN 1.4542, UNS S17400, AISI 630


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.

Related Standards



Diameter d

25.4 - 355.6 mm


Elongation A

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

Chemical properties


Weight %



15 - 17.5 %


3 - 5 %


3 - 5 %


1 %


1 %


Technological properties

Application areas

chemical, petrochemical, paper and general metalworking industries

Processing history

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.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.