Stainless Steel 17-7 PH
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Stainless Steel 17-7 PH
17-7 PH stainless steel is a stable, chromium-nickel-aluminum steel that’s frequently used in the aerospace industry and when meticulous, elaborate parts are needed.
17-7 PH applications
Springs
Washers
Blades
Fluid seal springs
Diaphragms
Pressings
Flexures
Encapsulated bellows
Altemp Alloys offers 17-7 PH stainless steel UNS S17700 in:
17-7 Plate
AMS 5528
17-7 Sheet
AMS 5528
AMS 5529
17-7 Bar
AMS 5644
Chemical Composition
| Element | Percent by Weight Type 17-7PH |
|---|---|
| Carbon | 0.09 maximum |
| Manganese | 1.00 maximum |
| Phosphorus | 0.05 maximum |
| Sulfur | 0.03 maximum |
| Silicon | 1.00 maximum |
| Chromium | 16.00 - 18.00 |
| Nickel | 6.75 - 7.75 |
| Aluminum | 0.75 - 1.50 |
Resistance to Corrosion
Corrosion resistance of Type 17-7PH stainless steel in all heat treated conditions, like other types of stainless steels - will develop superficial rust in some environments. For example, in a marine atmosphere, stainless steels show evidence of rusting after relatively short exposure periods. However, after exposure of one or two years, the amount of rust present is little more than that present at six months. As with all martensitic steels, 17-7PH stainless steel may be subject to cracking when exposed under stress in environments containing hydrogen sulfide. Such applications are not recommended.
