Available Shapes
17/4PH Stainless Steel
Alloy 17-4PH (UNS S17400), AISI 630, is a chromium-nickel-copper precipitation-hardening martensitic stainless steel with an addition of niobium. 17-4PH combines high strength and hardness with good corrosion resistance. The alloy is furnished in the solution annealed condition (Condition A). It should not be used at temperatures above 572°F (300°C) or for cryogenic service. Optimal mechanical properties can be obtained by subjecting the alloy to age hardening heat treatments. Heat treatment in the 900°F (482°C) range produces the highest strength. The corrosion resistance of Alloy 17-4PH is comparable to 304 stainless steel in most environments, and is generally superior to the 400 series stainless steels. It is used in applications where the combination of moderate corrosion resistance and unusually high strength are required. Alloy 17-4PH can be easily welded and processed by standard shop fabrication practices. It is magnetic.
Related Specifications
EN/DIN1.4542 X5CrNiCuNb16.4 AFNOR Z6CNU17-O4 ASTM-A564 Grade 630 UNS S17400 JIS SUS630 AMS 5643 5604 EN10088-3 H900 H1025 H1075 H1150D
Applications
Analysis
Forging
Corrosion Resistance
Welding
Machining
Nitriding
Applications
• Aerospace — structural and parts
• Biomedical — hand tools
• Chemical Processing
• Food Process Equipment
• Gate Valves
• Mechanical Components
• Nuclear Waste Processing and Storage
• Oil and Gas Production — foils, helicopter deck platforms, etc.
• Pulp and Pap
Analysis
| Carbon | 0.07% max | Chromium | 15.00-17.50% |
| Manganese | 1.00% max | Nickel | 3.00-5.00% |
| Silicon | 1.00% max | Copper | 3.00-5.00% |
| Phosphorous | 0.04% max | Niobium + | 0.15-0.45% |
| Sulphur | 0.03% max | Tantalum |
Forging
Heat slowly and uniformly to 1180-1200ºC. Do not forge below 1010ºC. Hold at temperature for one hour prior to forging the component. Cool in air to room temperature. Forged components require solution annealing before any further heat treatment.
Corrosion Resistance
17-4PH stainless has very good corrosion resistance properties. Corrosion tests in service have shown good results in all aged conditions. With better corrosion resistance to standard hardenable stainless grades such as 431, 420 and 410. 17-4PH has corrosion resistance comparable to 304 stainless specification.
Welding
Alloy 17-4PH can be readily welded by most standard processes
Machining
lloy 17-4PH can be machined in both the solution treated and precipitation hardened conditions. Machining characteristics may vary according to the hardness of the metal. High speed tools are acceptable, but carbide tools are preferred. Standard lubrication should be used. Dimensional changes as a result heat treatment should be taken into account if very stringent tolerances are required.
Nitriding
For increase resistance to surface wear, with a slight reduction in corrosion resistance, 17-4PH can be nitrided.
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