What is Stainless Steel Grade 17-7PH Precipitation Hardened (UNS S17700)?

Suitable for use in fresh water and industrial atmospheres and mild chemical and oxidizing environments. We don’t recommend its use in salt water or reducing environments.

The following datasheet gives an overview of grade 15-7 stainless steel.


Chemical Composition

ElementContent(%)
Chromium (Cr)16 – 18
Nickel (Ni)6.5 – 7.75
Manganese (Mn)1 max
Silicon (Si)1 max
Aluminum (Al)0.75 – 1.5
Carbon (C)0.09 max
Phosphorus (P)0.04 max
Sulfur (S)0.03 max
Iron (Fe)Balance


Physical Properties


PropertiesMetricImperial
Density7.80 g/cm³0.282 lb./in³


Mechanical Properties


PropertiesMetricImperial
Tensile Strength1170 MPa170000 ksi
Yield Strength965 MPa140000 ksi
Elastic Modulus204 GPa29600 ksi
Poisson’s Ratio0.27 – 0.300.27 – 0.30
Elongation at Break6%6%
Hardness, Rockwell B (converted from Brinell)3838


Thermal Properties


PropertiesMetricImperial
Thermal Expansion (@ 0.000 – 100°C/32 – 212°F)11 µm/m°-C6.11 µin/in°F
Thermal Conductivity16.4 W/mK114 BTU in/hr.ft².°F


Fabrication and Heat Treatment


Machinability


To heat treat:

  • Austenite condition
  • Cool for transformation to martensite
  • Precipitation hardening to condition TH 1050 or RH 950.

Welding

Use common arc and resistance methods. Inert gas shielding is necessary for fusion welding to reduce oxidation of aluminum.


Forming

Similar to stainless steel grade 301. Intermediate annealing may be required for radical forming.


Heat Treatment

Cold work solution treated material for condition C material. Heat condition C material at 482°C (900°F) for 1 h before cooling.

Heat solution treated material at 955°C (1750°F) for 10 min in A1750 condition followed. R100 condition is cooled at -73°C (-100°F) for 8 h within 1 h of treating to A1750 condition. Heat again at 510°C (950°F) for 1 h in the RH 950 condition.

Heat at 760°C (1400°F) after fabrication for 90 min in the condition T. Cool again at 13°C (55°F) for 0.5 h within 60 min. Heated at 565°C (1050°F) for 90 min in TH1050 condition. Cool in air.


Annealing

Perform at 1066°C (1950°F) for 3 min for every 0.1 inch (2.5 mm) of thickness. Cool in air.


Applications

Grade 17-7PH steel is used in applications needing corrosion resistance, strength, and mechanical properties up to 427°C (800°F). Its low distortion make it ideal for intricate parts.


Grade 17-7PH stainless steel is used in the following applications:


  • Springs and washers
  • Chemical processing equipment
  • Heat exchangers
  • Power boilers
  • Superheater tubes
  • Components used in high-strength/high-temperature conditions

 See more..

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