UNS S17400 Precipitation Hardening Stainless Steel Bar Chromium Nickel Copper Martensitic Stainless Steel
Machined The Solution Treated and Precipitation Hardened Conditions 17-4ph Bar
1 . Descriptions:
Alloy 17-4PH (UNS S17400), Type 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.
2 . Chemical Composition:
| Grade | Standard | C | Si | Mn | P | S | Cr | Ni | Cu | Nb |
| 630 | ASTM A564 | ≤0.07 | ≤1.0 | ≤1.0 | ≤0.04 | ≤0.03 | 15.0～17.0 | 3.0～5.0 | 3.0～5.0 | 0.15～0.45 |
3 . Mechanical Properties:
| CONDITION | AS-BUILT² | AFTER POST HEAT TREATMENT³ | |
| Ultimate Tensile Strength, MPa | ASTM E8 | 1100 ± 50 | 1300 ± 50 |
| Yield Strength, MPa | ASTM E8 | 620 ± 30 | 1100 ± 50 |
| Elongation at break, % | ASTM E8 | 16 ± 2.0 | 10 ± 2.0 |
| Hardness | 300 ± 20 HV5 | 400 ± 20 HV5 | |
| Density | approx. 100% | ||
4 . Applications:
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.
• Aerospace — structural and parts
• Biomedical — hand tools
• Chemical Processing
• Food Process Equipment
• Gate Valves
• Mechanical Components
• Oil and Gas Production — foils, helicopter deck platforms, etc.
• Pulp and Paper — paper mill equipment
5 . Features:
- High tensile strength and hardness to 600°F
- Corrosion resistant
- Excellent oxidation resistance to about 1100°F
- Creep-rupture strength to 900°F
6 . More pictures
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