17-7 PH Stainless Steel, RH950, bar and forgings


Subcategory: Ferrous Metal; Metal; Precipitation Hardening Stainless; Stainless Steel; T S10000 Series Stainless Steel

Key Words: UNS S17700, double treatment alloy, RH950, bar and forgings, 17-7PH, 17-7 PH, 17/7PH, 17/7 PH, Precipitation Hardening

Component   Wt. %
Al0.75 - 1.5 
CMax 0.09 
Cr16 - 18 
MnMax 1 
Ni6.5 - 7.75 
PMax 0.04 
SMax 0.04 
SiMax 1 

Material Notes:
Properties are measured in the longitudinal direction.

Processing: RH950 - heated to austenitic range, 1040C (1900F), and water quenched. Reheated to 925C (1700F) to precipitate carbides. The austenite is transformed to martensite after cooling to room temperature and refrigerating at -75C (-100F). Tempered at 510C (950)

Applications: high strength high temperature applications, chemical processing equipment, heat exchangers, power boilers, superheater tubes

Corrosion Resistance: 17-7 PH is suitable for use in fresh water, industrial and marine atmospheres, and mild chemical and oxidizing environments. 17-7 PH should not be used in salt water or reducing environments.

Physical PropertiesMetricEnglishComments
Density7.8 g/cc0.282 lb/in 

Mechanical Properties
Hardness, Rockwell C4141 
Tensile Strength, Ultimate1275 MPa185000 psi 
Tensile Strength, Yield1030 MPa149000 psi 
Elongation at Break6 %6 % 
Reduction of Area10 %10 % 
Modulus of Elasticity204 GPa29600 ksi 
Fracture Toughness76 MPa-m69.2 ksi-in Longitudinal, 44 HRC.

Electrical Properties
Electrical Resistivity8.3e-005 ohm-cm8.3e-005 ohm-cm 

Thermal Properties
CTE, linear 20C11 m/m-C6.11 in/in-F from 0-100C (32-212F)
CTE, linear 250C11.6 m/m-C6.44 in/in-F from 0-315C (32-600F)
Specific Heat Capacity0.46 J/g-C0.11 BTU/lb-F from 0-100C (32-212F)
Thermal Conductivity16.4 W/m-K114 BTU-in/hr-ft-F at 100C(212F); 21.8 W/m-K at 500C (930F)
Melting Point1400 - 1450 C2550 - 2640 F 
Solidus1400 C2550 F 
Liquidus1450 C2640 F 


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