17-4 Stainless Steel
Chemical Composition
Carbon:             0.07% (Max)
Silicon:              1.00% (Max)
Manganese:        1.00% (Max)
Phosphorous:      0.040% (Max)
Sulfur:               0.030% (Max)
Chromium:          15%-17.5%
Molybdenum:       0.50% (Max)
Nickel:                3%-5%
Copper:               3%-5%
The physical properties of 17-4 PH stainless steel vary depending on any tempering processes done to the material. If you require specific physical properties for your application, please contact an Alro Sales Representative to make sure this material will meet your needs.
Typical Uses
Typical applications for 17-4 stainless steel include:
  • Motor Shafts
  • Aircraft Structural Parts
  • Valve Stems
  • Gears

17-4 Precipitation-Hardening Stainless Steel

Alro stocks 17-4 Stainless - a chromium-copper precipitation hardening stainless steel used for applications requiring high strength and a moderate level of corrosion resistance. 17-4 PH is a chromium-nickel grade of stainless that may be hardened by a single low temperature precipitation-hardening heat treatment. Excellent mechanical properties at a high strength level may be obtained by such treatment. Scaling and distortion is minimized. 17-4 PH should not be used in the solution treated condition.  17-4 machines well, has excellent welding characteristics, and forges easily. The combination of good mechanical and processing properties makes this grade adaptable to a wide range of uses. Alloy 17-4 PH withstands corrosive attacks better than any of the standard hardenable stainless steels and is comparable to Alloy 304 in most media.