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The material 17 4PH stainless steel is a rustproof, martensitic, hardenable Cr-Ni-Cu steel with high strength and toughness.
For US customers: -> Our Warehouse in Beaumont Texas

International identifiers

X5CrNiCuNb16-4 / X5CrNiCuNb17-4-4 | AISI – 630 | UNS S17400 NACE MR0103 / MR0175 | AFNOR Z7CNU15-05 / Z7CNU17-04 ASTM A564 17-4PH / A564M-13 | JIS SCS24 / SUS630

Chemical composition

174PH C Si Mn P S Cr Mo Ni V
min. bis bis bis bis bis 15 bis 3
max. 0,7 0,7 1,0 0,04 0,03 17,5 0,6 5
17-4PH Al Cu N Nb Ti other
min. 3,0 5xC
max. 5,0 0,45

Particularities:

  • Available in ESU quality

  • Very good corrosion resistance, strength & toughness

  • Excellent notched impact strength – even in the low-temperature range

  • Proven resistance to stress corrosion cracking

  • Triple attestation (17-4PH | 1.4542 | 1.4548)

  • Ultrasonically tested material to ASTM & NACE standards

  • Suitable for use in maritime environments

Available in swap state:

Condition H1150 (Rm > 930N/mm2)
Condition H1025 (Rm > 1070N/mm2)
Condition H900 (Rm > 1310N/mm2)
Condition A (Rm max. 1200N/mm2) max. hardness of 363 HB.

Machining and subsequent hardening possible.

Weldability:

The material 17 4PH offers excellent welding properties for various welding processes (TIG, electric arc welding). Welding should be carried out in the solution annealed condition.

Heat treatment:

In the solution-annealed condition (A), the material 17-4 can develop a wide range of properties and be adjusted to very good notched impact strength through appropriate heat treatment. In contrast to normal, hardenable materials, the material 174 PH can already be hardened to the desired final property in one operation.

The table Aging (age hardening) gives an overview of the required times and temperatures.

Age hardening

Condition Temperature in °C / °F Curing Time (hours) Cooling
H900 482 °C (900 °F) 1 Air
H1025 552°C (1025 °F) 4 Air
H1150 621 °C (1150 °F) 4 Air

Cold forming: possible
Hot forming: possible

If you need further information on the subject of cold forming and hot forming – our technical sales department will be happy to advise you.

Area of application:

The material grade 17 4PH is used, for example, for cover discs in compressor construction, valve blocks and for fittings (valves, bushings, etc.) in the petroleum and chemical industries, which require high hardness and corrosion resistance at temperatures of up to 600°F (316°C ) require. The material can be used in maritime environments. For permanent use in standing sea water, however, additional protection is recommended to prevent crevice corrosion.

Physical Properties:

Density in kg/dm3: 7.8
Electrical resistance at 20°C in (Ω mm2)/m: 0.71
Thermal conductivity at 20°C in W/(m K): 16
Specific heat capacity at 20°C in J/(kg K): 500

Mechanical properties at room temperature
according to ASTM A564:

(forging up to 300 mm)

Condition Hardness 0,2% proof stress N/mm² min Tensile strength N/mm² Elongation A % min. Reduction of area % min. Impact strength (ISO-V) J min.
L Q L Q L Q
H900 400-450 1170 1310 8 6 38 25 20 10
H1025 330-390 1000 1080 12 10 45 30 25 20
H1150 270-340 750 930 16 13 50 38 42 32

L=Longitudinal; Q=Transverse

Why saw cut?

The mechanical processing of the material with the band saw results in a significantly lower unintentional deformation and hardening of the material for the existing structure, in contrast to flame cutting.

Thus, the workpiece processed by the saw already has a homogeneous structure at the edge, which does not change in the continuation of the material. This circumstance enables the immediate finishing of the workpiece with milling or drilling, without having to carry out another soft annealing or similar work step beforehand.

Contact us now for more information