17-4 PH® Stainless Steel Wire UNS S17400

17-4 PH Stainless Steel is the most widely used of all precipitation hardening stainless steels. It's a martensitic steel that combines high strength, corrosion resistance, impecable mechanical properties up to 600°F and good toughness. End use applications are within the aerospace, chemical, food processing, and metalworking industries.
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Shaped, Flat, Square, Round, Fine Wire, Plated and Bare Wire ASTM A564, ASTM 693, AMS 5523, AMS 5604, AMS 5643

17-4PH® Alloy Description

17-4 PH® is a martensitic, chromium-nickel-copper precipitation-hardening stainless steel that provides an outstanding combination of high strength, good corrosion resistance, good mechanical properties at temperatures up to 600ºF (316ºC). This alloy is typically furnished in Condition A (annealed) but can be cold rolled to various temper ranges.

Applications of 17-4PH

Chemistry Typical

  • Carbon: 0.070 max
  • Manganese: 1.00 max
  • Silicon: 1.00 max
  • Chromium: 15.00-17.00
  • Nickel: 3.00-5.00
  • Copper: 3.00-5.00
  • Columbium +Tantalum: 5 x Carbon min – 0.45 max
  • Phosphorus: 0.040 max
  • Sulfur: 0.030 max
  • Iron: Balance

Physical Properties of 17-4PH

Density: 0.280 lbs/in³, 7.80 g/cm³

Electrical Resistivity: (microhm-cm):
68°F (20°C): 98

Specific Heat: BTU/lb/°F (kJ/kg•K):
32-212°F (0-100°C): 0.11(0.46)

Thermal Conductivity: BTU/hr/ft²/in/°F (W/m•K)
At 300°F (149°C): 124 (17.9)
At 900°F (482°C): 157 (22.6)

Mean Coefficient of Thermal Expansion:in/in/°F (μm/m•K)
70-200°F (21-93°C): 6.0 x 10 (10.8)
70-600°F (21-315°C): 6.2x 10 (11.2)
70-800°F (21-427°C): 6.3x 10 (11.3)

Modulus of Elasticity: KSI (MPa)
29.0 x 10³ (200 x 10³) in tension
11.2 x 10³ (78 x 10³) in torsion

Magnetic Permeability: Strongly ferromagnetic in all conditions

Mechanical Properties of 17-4PH Stainless at Room Temperature

Properties: Annealed

AMS 5604 (gauges: ≥ .015 inches)
Ultimate Tensile Strength: 185 KSI max (1255 MPa max)
Yield Strength (0.2% offset): 160 KSI max (1105 MPa max)
Elongation: 3% Min
Hardness: Rc 38 max

Properties Tempered

Alloy 17-4 PH® can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Heat Treat Capabilities (Aged)


Ultimate Tensile Strength:190 KSI min (1310 MPa min)
Yield Strength (0.2% Offset): 170 KSI min (1170 MPa min)
Elongation: 5% min
Hardness: Rc 40-48


Ultimate Tensile Strength: 170 KSI min (1170 MPa min)
Yield Strength: 155 KSI min (1070 MPa min)
Elongation: 5% min
Hardness: Rc 38-46


Ultimate Tensile Strength: 155 KSI min (1070 MPa min)
Yield Strength: 145 KSI min (1000 MPa min)
Elongation: 5% Min
Hardness: Rc 35-43


Ultimate Tensile Strength: 145 KSI min (1000 MPa min)
Yield Strength: 125 KSI min (860 MPa min)
Elongation: 5% min
Hardness: Rc 35-43


Ultimate Tensile Strength: 140 KSI min (965 MPa min)
Yield Strength: 115 KSI min (790 MPa min)
Elongation: 5% min
Hardness: Rc 31-40


Ultimate Tensile Strength: 135 KSI min (930 MPa min)
Yield Strength: 105 KSI min (725 MPa min)
Elongation: 8% min
Hardness: Rc 28-38


Ultimate Tensile Strength: 115 KSI min (790 MPa min)
Yield Strength: 75 KSI min (515 MPa min)
Elongation: 9% min
Hardness: Rc 26-32

Additional Properties

Corrosion Resistance of 17-4PH

The corrosion resistance of Type 17-4PH® is comparable to that of Type 304 stainless Steel in most media and superior to that of the hardenable 400 series stainless steels. Refer to NACE (National Association of Corrosion Engineers) for recommendations.

Standard Wire Finishes for 17-4PH Stainless Steel

Extra Clean: (XC) Extra clean is also referred to as “bright annealed” or “bright annealed and cold rolled
Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for decorative application
Soap (round wire only): Soap is used as a lubricant in the drawing process and is not removed. It acts as a lubricant during customer part forming operation. A soap finish is available in tempered products.
Plated: Many plating options are available Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating requests.


  • Continuous Coils
  • Cut to lengths
  • Precision cutting

Heat Treatment of 17-4PH

Alloy 17-4® PH can be heat treated to increase mechanical properties. Contact Ulbrich Technical Service for information.

Welding 17-4PH

For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods 17-4 PH® is a registered trademark of AK Steel Corporation

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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