17-4PH Stainless Steel

TYPICAL ANALYSIS:

Comparable standards: UNS17400 Type 630 ASTM A564 Type 630

17-4PH is a precipitation-hardening martensitic stainless steel, which combines high strength and hardness (after heat treatment) with excellent corrosion resistance, and is suitable for easy fabrication.

Solution Treatments: As supplied 17-4PH, is usually in the solution treated condition, (Condition A). It can be heat treated at different temperatures to off a wide range of properties. (We also hold stock in HH1150).

Typical Mechanical Properties

Welding: Arc and resistance welding processes used on standard grades of stainless steel are applicable to 17-4PH Stainless Steel. The low hardness enables sections, up to 100mm, to be welded without requiring preheating.
Corrosion Resistance: 17-4PH Stainless Steel has excellent corrosion resistance. Corrosion tests and service experience have shown that in all aged conditions it is superior to standard hardenable stainless grades such as 420, 431 and 410 stainless. Its corrosion resistance is comparable to grade 304 stainless.
Fabrication: 17-4PH Condition A is suitable for limited cold forming. H1100, H1150 and overaged conditions are more suitable when severe cold forming is required.
Machining: Machining 17-4PH Condition A has machining characteristics similar to stainless grades 302, 304 and 410. The high hardness and strength in Condition H900 is the most difficult to machine and the material should be machined at 60% of the rate used for Condition A.
Nitriding: To increase the resistance to surface wear, with a slight decrease in corrosion resistance, 17-4PH Stainless Steel can be nitrided. An approximate hardness of 64/67Rc can be achieved, with a surface hardness depth of up to 0.150mm, when nitrided at 540° C, while still maintaining a high core strength.