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 include:

• Springs
• Washers
• Blades
• Fluid seal springs
• Diaphragms
• Pressings
• Flexures
• Encapsulated bellows

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.

In what form is Stainless Steel 17-7ph available at ISHWAR STEEL CORPORATIONs?

• Bar
• Wire
• Sheet
• Plate
• Forgings
• Pipe
• Flanges