SS 17/4 PH® is a precipitation hardenable Martensitic stainless steel with high strength, and good corrosion resistance. This makes it perfect for use in metal diaphragms, for both aerospace sensors and burst discs. It is easily heat treated from the annealed
temper.
The corrosion resistance of the alloy is comparable to SS 302. It is heat treated at 900° F/1 Hour for highest strength. Other thermal treatments can be utilized to provide greater toughness and improved formability. Joining of the alloy is accomplished by the usual methods that are effective for stainless steel.
Available Sizes:
SS 17/4 PH® is available from Hamilton Precision Metals as strip product in thicknesses from 0.001” to 0.050” (0.0254 mm to 1.27 mm) and widths up to 12.0” (304.8
mm). The material conforms to AMS 5604, ASTM A693 and UNS S17400.
Nominal Composition
| SS 17/4 PH® NOMINAL COMPOSITION |
| Chromium |
15.3%
|
| Nickel |
4.3%
|
| Copper |
3.3%
|
Columbium/
Tantalum |
0.25%
|
| Carbon |
0.04%
|
| Iron |
Balance
|
Mechanical Properties
| SS 17/4 PH® MECHANICAL PROPERTIES |
|
ANNEALED |
ANNEALED HEAT TREATED |
| Ultimate Tensile Strength |
160,000 PSI |
200,000 PSI |
| Yield Strength (0.2% Offset) |
145,000 PSI |
180,000 PSI |
| Elongation in 2” * |
5%
|
3%
|
| Modulus of Elasticity (Tension) |
28.5 x 10-6
PSI
|
|
| Poisson’s Ratio |
0.27
|
|
*The measured elongation will be less as thickness decreases to 0.002” and less.
These values may be adjusted by control of process variables – consult HPM for desired values
Physical Properties
| SS 17/4 PH® PHYSICAL PROPERTIES |
| Density (Heat Treated) |
0.282 lbs/cu.in. |
| Electrical Resistivity (Heat Treated) |
80 Microhm·cm |
Thermal Expansion Coefficient
(21° to 93°C) – Heat Treated |
10.8 x 10-6 /°C |
|
Thermal Conductivity @ 150°C
|
17.9 W/m·K
|
| Magnetic Attraction |
Yes
|
Typical values to guide alloy selection but are not a guarantee of minimum or maximum.