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Stainless steel material 17-4PH
Stainless steel
Stainless steel17-4PH
Stainless steel material 17-4PH

Stainless steel material 17-4PH

17-4 PH Steel contains 4% copper and may be hardened by a single low temperature precipitation hardening heat treatment, producing excellent mechanical properties at a high strength level. 17-4 PH provides this high strength in combination with good mechanical properties at temperatures of up to 600°F (316°C).
Product infomation
17-4PH is readily hot forged. During heat treatment or forging, protective atmospheres containing carbon or nitrogen should be avoided. These elements can be absorbed into the steel surface and give soft austenitic skin. If a protective atmosphere is required argon or helium is recommended.

The alloy also possesses good toughness when welded, while short low-temperature heat treatments reduce warping and scaling. Additionally, 17-4PH is easy to machine and fabricate.

Thanks to the beneficial properties, 17-4PH finds use in various industries. Typical parts include mechanical seals, oil patch, and pump shafts.


 
Technical data
Machinability 17-4PH can be machined in both the solution annealed condition and the precipitation hardened condition. Because the final heat treatment temperature is low, 17-4PH can be machined to final dimension in the annealed condition and then aged without significant dimensional change or scaling unless the component is large, when allowance should be made for contraction on aging.
In the annealed condition machining is only marginally different from 300 series austenitic stainless steels. In the H900 condition the machining rate is 60% of that for annealed material.

CHEMICAL COMPOSITION
GRADES  SS316 17-4PH
Carbon 0.05 0.06
Manganese 2 0.9
Phosphorous 0.045 0.03
Sulfur 0.03 0.02
Silicon N/A 0.9
Copper, columbium, and Tantalum N/A 4
Molybdenum 2.1 N/A
Nickel 8 4
Chromium 18 17.5
 
hysical Properties of Stainless Steel 17-4PH
Property Imperial Metric
Melting Range 2560-2625 °F 1404-1440 °C
Specific Heat 0.11 Btu/lb.-°F 460 Joules/gg-K
Specific Density 0.282 lb/in3 7.8 g/cm3
Electrical Resistivity 38.6 µΩ in 98 µΩ cm
Linear Coefficient of Thermal Expansion (70 °F to 200 °F) (21 °C to 93 °C) 6 [in/in/°F·106] 10.8 [μm/m·°C]
Linear Coefficient of Thermal Expansion (70 °F to 400 °F) (21 °C to 204 °C) 6 [in/in/°F·106] 10.8 [μm/m·°C]
Linear Coefficient of Thermal Expansion (70 °F to 600 °F) (27 °C to 316 °C) 6.2 [in/in/°F·106] 11.2 [μm/m·°C]
Linear Coefficient of Thermal Expansion (70 °F to 800 °F) (21 °C to 427 °C) 6.3 [in/in/°F·106] 11.2 [μm/m·°C]
Thermal Conductivity (@ 300 °F) (@ 149 °C) 124 Btu/(hr/ft²/in/°F) 17.9 [W/m-K]
Thermal Conductivity (@ 500 °F) (@ 260 °C) 135 Btu/(hr/ft²/in/°F) 19.5 [W/m-K]
Thermal Conductivity (@ 860 °F) (@ 460 °C) 156 Btu/(hr/ft²/in/°F) 22.5 [W/m-K]
Thermal Conductivity (@ 900 °F) (@ 482 °C) 157 Btu/(hr/ft²/in/°F) 22.6 [W/m-K]
Poisson’s Ratio (H900 Condition) 0.272 0.272
Modulus of Elasticity (H900 Condition) 28 x 106 ksi 197 x 103 MPa
Modulus of Rigidity in Torsion 9.68 x 103 ksi 67 x 103 MPa
Stainless Steel 17-4PH Mechanical Properties
Property Imperial Metric
Ultimate Tensile Strength 23,300 psi 160 MPa
Yield Strength (0.02%) 16,680 psi 115 MPa
Elongation (% in 2’’) 5% 5%
Rockwell Hardness C 35 35
Heat Treatment

Stainless Steel 17-4PH is available in the solution annealed condition at 1900 °F (1038 °C) and then air-cooled to 90 °F (32 °C).

However, additional heat treatments can produce various hardness and toughness levels. The most common treatments are listed in the table below.

Condition Temperature [± 15 °F (± 8.4 °C)] Cooling Method and Duration
H 900 900 °F (482 °C) Air cooling for 1 hour
H 925 925 °F (496 °C) Air cooling for 4 hours
H 1025 1025 °F (551 °C) Air cooling for 4 hours
H 1075 1075 °F (580 °C) Air cooling for 4 hours
H 1100 1100 °F (593 °C) Air cooling for 4 hours
H 1150 1150 °F (621 °C) Air cooling for 4 hours
H 1150 + 1150 1150 °F (621 °C)
followed by
1150 °F (621 °C)
Air cooling for 4 hours
followed by
Air cooling for 4 hours
H 1150-M 1400 °F (760 °C)
followed by
1150 °F (621 °C)
Air cooling for 2 hours
followed by
Air cooling for 4 hours
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