Wire -17-7 PH Stainless Steel

Wire -17-7 PH Stainless Steel

17-7 PH Stainless Steel

UNS S17700
W. Nr 1.4568


Springs, Rings, Washers, Heat Exchangers, Tubing


17-7 PH is a precipitation-hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment. The alloy provides valuable property combinations particularly well suited for aerospace applications. This special alloy also provides benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for springs at temperatures up to 600°F (316°C).

Industries Supplied

Chemical Processing, Aerospace, Automotive

Nominal Composition

Cr: 16.0 – 18.0
Fe: Bal min
Mn: 1.0 max
Ni: 6.5 – 7.8
Si: 1.0 max
C: 0.09 max
S: 0.030 max
P: 0.040 max
Al: 0.75 – 1.5

Physical Properties

A-Annealed: At 70°F (At 20°C)
Aged – CH900:  At 70°F (At 20°C)

A-Annealed: 0.282 lb/in3 (7.81 g/cm3 )
Aged – CH900: 0.277 lb/in3 (7.67 g/cm3 )

Modulus of Elasticity (E):
Aged – CH900: 29.5 x 103 ksi (200 GPa)

Modulus of Rigidity (G):
Aged – CH900:  10.5  x 103 ksi (72 GPa)

Coefficient of Expansion:
A-Annealed: 9.5 µin/in.-°F at 70-600°F (17.1 µm/m-°C at 21-316°C)
Aged – CH900: 6.4 µin/in.-°F at 70-600°F (11.5 µm/m-°C at 21-316°C)

Electrical Resistivity:
A-Annealed: 80.0 µohm-cm
Aged – CH900:  83.8 µohm-cm

Thermal Conductivity:
Aged – CH900:  114 Btu-in/ft2hr-°F at 300°F, (16.4 W/m-°C at 149°C)

Applicable Specifications

Wire & Bar: ASTM A313, AMS 5678

Typical Mechanical Properties

  • Annealed
    • Heat Treatment: 1900-2050°F (1038-1121°C)
    • Tensile Strength: 150 ksi max; (1034 MPa)
    • Suggested Operating Conditions: Up to 900°F (482°C)
  • Spring 
    • Tensile Strength:  ≤.100” dia. 240-300 ksi (1655-2070 MPa)
      >.100” ≤.225” dia. 215-240 ksi (1480-1655 MPa)
      >.225” ≤.625” dia. 190-215 ksi (1310-1480 MPa)
    • Suggested Operating Conditions:  Up to 650°F (343°C)
  • Spring + Aged (CH900)
    • Heat Treatment: 900°F (482°C) 60 mins/AC
    • Tensile Strength:  ≤.100” dia. 280-365 ksi (1930-2515 MPa)
      >.100” ≤.225” dia. 250-305 ksi (1720-2100 MPa)
      >.225” ≤.625” dia. 230-275 ksi (1585-1895 MPa)
    • Suggested Operating Conditions:  Up to 650°F (343°C)

For further information Contact:

Contact Us
1 847 695 1900
Elgiloy Specialty Metals – Wire Products
356 N.Cross Street
Sycamore, IL 60178 USA

Limitation of Liability and Disclaimer of Warranty:
• The content in these data sheets is provided primarily by third-party melting mills and is provided for reference only. It is not intended for engineering or design.
• Applications may be discussed, however, Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, does not recommend or endorse any material for any particular end use or application.
• The data included in this data sheet are typical values and may vary.
• Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, makes no representations or warranties, express or implied, as to the accuracy, completeness, condition, suitability, performance, fitness for a particular purpose, or merchantability of any information contained in any data sheet.
• In no event will Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, be liable for any damages whatsoever arising from the use of the information included in the data sheets.