17-7 PH® Stainless Steel Wire UNS S17700

17-7 Precipitation Hardening alloy is a semi-austenitic stainless steel which is austenitic in the annealed condition, but martensitic in the hardened condition. It provides high strength and hardness to go along with excellent fatigue properties. Typical applications include springs, washers and bellows.
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17-7 Stainless Shaped, Flat, Square, Round, Fine Wire, Plated and Bare Wire AMS 5528 (COND A), AMS 5529 (COND C), ASTM A693, MIL-S25043

17-7PH® Alloy Description

Alloy 17-7 PH® precipitation hardening stainless steel alloy. It is a semi-austenitic being austenitic in the annealed condition and martensitic in the hardened condition. Alloy 17-7 PH® provides high strength and hardness, excellent fatigue properties, good corrosion resistance and minimum distortion upon heat treatment. It is easily formed in the annealed condition, then hardened to high strength levels by simple heat treatments to Conditions RH 950 and TH 1050. The exceptionally high strength of Condition CH 900 offers many advantages where limited ductility and workability are permissible. In its heat treated condition, this alloy provides exceptional mechanical properties at temperatures up to 900ºF (482ºC).


Chemistry Typical

  • Carbon: 0.090 max
  • Manganese: 1.00 max
  • Silicon: 1.00 max
  • Chromium: 16.00-18.00
  • Nickel: 6.50-7.75
  • Aluminum: 0.75-1.50
  • Phosphorus: 0.040 max
  • Sulfur: 0.030 max
  • Iron: Balance

Physical Properties of 17-7 PH

Density: (Cond. A), 0.282lbs/in³, 7.80 g/cm³

Electrical Resistivity: (microhm-cm) (all conditions):
68°F (20°C): 80

Thermal Conductivity: BTU/hr/ft²/ft/°F (W/m•K):
At 300°F (149°C): 9.5 (16.5)

Mean Coefficient of Thermal Expansion: in/in/°F (μm/m•K): (Cond. A)
70-200°F (21-93°C): 8.5 x 10 (15.3)
70-400ºF (21-204ºC): 9.0 x 10 (16.2)
70-600°F (21-315°C): 9.5x 10 (17.1)
70-800°F (21-427°C): 9.6x 10 (16.0)

Magnetic Permeability:

Annealed: Weakly ferromagnetic

Heat treated: Strongly ferromagnetic

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

Mechanical Properties of 17-7 PH Stainless Steel at Room Temperature

Properties: Annealed

Gauge Range: < .010 inches

Ultimate Tensile Strength: 150 KSI max (1035 MPa max)
Yield Strength (0.2% offset): 65 KSI max (450 MPa max)
Elongation: Consult Ulbrich Wire

Gauge Range: > .010 inches

Ultimate Tensile Strength: 150 KSI max (1035 MPa max)
Yield Strength (0.2% offset): 55 KSI max (380 MPa max)
Elongation: 20% min
Hardness: Rb 92 max

Typical Condition C

Ultimate Tensile Strength: 200 KSI min (1380 MPa min)
Yield Strength (0.2% offset): 175 KSI min (1205 MPa min)
Elongation: 1% min
Hardness: Rc 41 min (aim)

Additional Rolled Tempers:

Consult Ulbrich Wire if tempers other than Condition C are required.

Heat Treat Capabilities

TH1050 Typical

Ultimate Tensile Strength: 180 KSI min (1240 MPa min)
Yield Strength: (0.2% Offset) 150 KSI min (1034 MPa min)
Elongation: Consult Ulbrich Technical Services
Hardness: Rc 38 min

RH950 Typical

Ultimate Tensile Strength: 210 KSI min (1450 MPa min)
Yield Strength: (0.2 Offset) 190 KSI min (1310 MPa min)
Elongation: Consult Ulbrich Technical Services
Hardness: Rc 44 min

CH900 Typical

Ultimate Tensile Strength: 240 KSI min (1655 MPa min)
Yield Strength: (0.2% Offset) 230 KSI min (1586 MPa min)
Elongation: 1% min
Hardness: Rc 46 min (aim)

Additional Properties

Corrosion Resistance of 17-7 PH

Refer to NACE (National Association of Corrosion Engineers) for recommendations.

Standard Wire Finishes

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 applications
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


Alloy 17-7 PH® can be hardened by:
Heat treatment from “Condition A” (RH950 or TH1050)
Cold rolling: Condition 1/2 C, 3/4 C, C
Heat treatment of Condition C (CH900)


For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods
17-7 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

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