17-7 PH® (UNS S17700)

Description
17-7 PH® is a chromium-nickel-aluminum precipitation hardening stainless steel that provides high strength and hardness and a moderate level of corrosion resistance up to 600˚F.  This grade can be easily formed in the austenitic condition similar to Type 301 stainless steel and hardened to high strength levels using relatively low heat treatments that minimize distortion.  The corrosion resistance of 17-7 PH is comparable to that of Type 304 stainless steel, and it has been used for spring applications, washers, eyelets, and fittings and fasteners.

Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A693 (Type 631)*
Element 17-7PH
Carbon 0.09
Chromium 16.0-18.0
Nickel 6.5-7.7
Manganese 1.00
Silicon 1.00
Aluminum 0.75-1.50
Phosphorus 0.040
Sulfur 0.030
* Maximum, unless range is indicated
Mechanical Properties
Mechanical property requirements for solution treated product (Condition A) as specified in ASTM A693.
Property 17-7PH
≤ 0.010 inch thick
17-7PH
> 0.010 inch thick
Yield Strength, min. (ksi) 65 55
Tensile Strength, min. (ksi) 150 150
Elongation, min. (%) - 20
Hardness, max. (Rb) - 92
18 SR® is a registered trademark of AK Steel Corporation
17-7 PH® is a registered trademark of AK Steel Corporation

Physical Properties
Physical properties for Type 17-7 PH stainless steel

Property 17-7 PH
Density, lb/in3 0.282
Modulus of Elasticity, psi 29 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F 8.5 x 10-6
Thermal Conductivity, Btu/ft hr ˚F 9.5
Specific Heat, Btu/lb ˚F 0.11
Electrical Resistivity, Microohm-in 31.5

Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein.  © 2014 RMP Inc. All rights reserved.