AMS 5622 specification covers a premium aircraft-quality, corrosion-resistant steel (17-4PH / UNS S17400) in the form of bars, wire, forgings, mechanical tubing, and flash-welded rings up to 8.0 inches (203 mm) in diameter in the solution heat-treated condition, and stock of any size for forging, flash-welded rings, or heading.
Specifications & Available17-4PH is a precipitation-hardenable martensitic stainless steel strengthened by copper-rich precipitates during aging. The AMS 5622 designation indicates premium aircraft-quality material produced by vacuum melting, ensuring superior cleanliness and consistency for critical aerospace applications. The alloy is available in solution heat treated (Condition A) and various aged conditions (H900, H925, H1025, H1075, H1100, H1150). Available Forms: Bar (round, flat, hex, square), wire, forgings, mechanical tubing, flash-welded rings, plate, sheet, strip, welding wire Size Limit: Up to 8.0 inches (203 mm) in diameter Specifications: AMS 5622 (premium aircraft-quality, vacuum melted), AMS 5643 (bar/forgings/tubing/rings), AMS 5604 (sheet/strip/plate), ASTM A564 Grade 630, ASTM A693, UNS S17400, WS 1.4542
Delivery Lead Times (after pre-payment confirmation)| Stock Status | Delivery Time |
|---|
| Products in stock | Within 3 days | | Raw material in stock | Within 10 days | | Re-melting required | 15 – 25 days |
ApplicationsAerospace: Aircraft structural components, landing gear parts, engine mounts, high-strength fasteners, fittings, actuators Chemical & Petrochemical: Pumps, valves, shafts, fittings, reactor components, high-pressure vessels Food Processing: Equipment requiring corrosion resistance and cleanability Paper Industry: Paper mill equipment, doctor blades, slitters General Metalworking: Gears, shafts, bushings, molds, dies, wear components Oil & Gas: Downhole tools, wellhead equipment, valve components (H1150 for sour service) Nuclear: Reactor components, control rod mechanisms
Chemical Composition | Chemical Composition (Weight %) | 17-4PH Specification |
|---|
| Chromium (Cr) | 15.0 - 17.5 | | Nickel (Ni) | 3.0 - 5.0 | | Copper (Cu) | 3.0 - 5.0 | | Niobium (Cb) | 0.15 - 0.45 | | Carbon (C) | 0.07 max. | | Manganese (Mn) | 1.00 max. | | Silicon (Si) | 1.00 max. | | Phosphorus (P) | 0.040 max. | | Sulfur (S) | 0.030 max. | | Iron (Fe) | Balance |
| Physical Properties | Metric | Imperial |
|---|
| Density | 7.78 - 7.80 g/cm³ | 0.281 - 0.282 lb/in³ | | Melting Range | 1400 - 1440°C | 2550 - 2625°F | | Modulus of Elasticity | 197 - 200 GPa | 28.6 - 29.0 × 10⁶ psi | | Coefficient of Expansion (20-100°C) | 10.8 µm/m·°C | 6.0 µin/in·°F | | Thermal Conductivity | 18.3 W/m·K | 127 BTU·in/hr·ft²·°F |
| Mechanical Properties (Solution Heat Treated – Condition A) | Metric | Imperial |
|---|
| Tensile Strength (max.) | 1100 MPa | 160 ksi | | Yield Strength (0.2% offset, max.) | 550 MPa | 80 ksi | | Elongation (min.) | 10% | 10% |
| Mechanical Properties (Aged Conditions – Minimum) | H900 | H925 | H1025 | H1075 | H1100 | H1150 |
|---|
| Tensile Strength (ksi) | 190 | 180 | 155 | 145 | 140 | 130 | | Yield Strength (ksi) | 170 | 160 | 140 | 125 | 115 | 105 | | Elongation (%) | 10 | 10 | 12 | 13 | 14 | 16 | | Reduction of Area (%) | 35 | 38 | 40 | 45 | 45 | 50 |
Heat Treatment| Condition | Treatment | Description |
|---|
| Condition A (Solution Annealed) | 1038°C (1900°F) × 0.5-1 hour, air cool or oil quench | Soft, machinable condition | | H900 | Condition A + 482°C (900°F) × 1 hour, air cool | Maximum strength | | H925 | Condition A + 496°C (925°F) × 4 hours, air cool | High strength, improved ductility | | H1025 | Condition A + 552°C (1025°F) × 4 hours, air cool | Balanced properties | | H1075 | Condition A + 579°C (1075°F) × 4 hours, air cool | Good strength, good toughness | | H1100 | Condition A + 593°C (1100°F) × 4 hours, air cool | Improved toughness | | H1150 | Condition A + 621°C (1150°F) × 4 hours, air cool | Maximum toughness, NACE MR0175 compliant |
Contact UsRequest a quote for AMS 5622 / 17-4PH Steel Bar (UNS S17400) – Premium Aircraft Quality – Solution Heat Treated – Precipitation Hardenable . Please provide: Diameter / size (round, flat, hexagon, square, wire, tubing) Length or weight required Product form (bar / wire / forging / tubing / ring / stock) Heat treatment condition (Cond A / H900 / H1025 / H1150, etc.) Tolerance requirement Destination port Any special certification requirements (premium aircraft quality certification)
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