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. % Al 0.75 - 1.5   C Max 0.09   Cr 16 - 18   Mn Max 1   Ni 6.5 - 7.75   P Max 0.04   S Max 0.04   Si Max 1

Material Notes:
Properties are measured in the longitudinal direction.

Processing: RH950 - heated to austenitic range, 1040°C (1900°F), and water quenched. Reheated to 925°C (1700°F) to precipitate carbides. The austenite is transformed to martensite after cooling to room temperature and refrigerating at -75°C (-100°F). Tempered at 510°C (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 Properties	Metric	English	Comments
Density	7.8 g/cc	0.282 lb/in³
Mechanical Properties
Hardness, Rockwell C	41	41
Tensile Strength, Ultimate	1275 MPa	185000 psi
Tensile Strength, Yield	1030 MPa	149000 psi
Elongation at Break	6 %	6 %
Reduction of Area	10 %	10 %
Modulus of Elasticity	204 GPa	29600 ksi
Fracture Toughness	76 MPa-m½	69.2 ksi-in½	Longitudinal, 44 HRC.
Electrical Properties
Electrical Resistivity	8.3e-005 ohm-cm	8.3e-005 ohm-cm
Thermal Properties
CTE, linear 20°C	11 µm/m-°C	6.11 µin/in-°F	from 0-100°C (32-212°F)
CTE, linear 250°C	11.6 µm/m-°C	6.44 µin/in-°F	from 0-315°C (32-600°F)
Specific Heat Capacity	0.46 J/g-°C	0.11 BTU/lb-°F	from 0-100°C (32-212°F)
Thermal Conductivity	16.4 W/m-K	114 BTU-in/hr-ft²-°F	at 100°C(212°F); 21.8 W/m-K at 500°C (930°F)
Melting Point	1400 - 1450 °C	2550 - 2640 °F
Solidus	1400 °C	2550 °F
Liquidus	1450 °C	2640 °F