AMS 5617L specification covers two grades of premium aircraft-quality, corrosion-resistant steel (Custom 455 / UNS S45500) in the form of bars, wire, and forgings in the solution heat treated condition, as well as forging stock. This martensitic age-hardenable stainless steel offers an exceptional combination of high strength, good corrosion resistance, excellent ductility, and toughness. Alloy 455 is relatively soft and formable in the annealed condition, yet through a single-stage aging treatment it develops exceptionally high yield strength while retaining good ductility and toughness .
1. Product Specifications & Physical DataCustom 455 is a martensitic stainless steel that achieves its high strength through precipitation hardening during a single aging treatment. The alloy is available in solution heat treated condition (Condition A) and in various aged conditions (H900, H950, H1000, H1050) depending on strength requirements. Available Forms: Bar (round, square, hex), wire, forgings, forging stock . Size Limitation: Standard product limited to 6.00″ (152.4 mm) diameter or thickness; when tested in H1000 condition, limited to 8.00″ (203.2 mm) . Specifications: AMS 5617L, ASTM A564 Type 4, UNS S45500, Werkstoff Nr. 1.4543 .
| Chemical Composition (Weight %) | UNS S45500 Specification |
|---|
| Chromium (Cr) | 11.0 - 12.5 | | Nickel (Ni) | 7.5 - 9.5 | | Molybdenum (Mo) | 0.50 max. | | Titanium (Ti) | 0.80 - 1.40 | | Copper (Cu) | 1.50 - 2.50 | | Columbium + Tantalum (Cb+Ta) | 0.10 - 0.50 | | Carbon (C) | 0.05 max. | | Manganese (Mn) | 0.50 max. | | Silicon (Si) | 0.50 max. | | Phosphorus (P) | 0.040 max. | | Sulfur (S) | 0.030 max. | | Iron (Fe) | Balance |
| Physical Properties | Metric | Imperial |
|---|
| Density | 7.78 g/cm³ | 0.281 lb/in³ | | Melting Range | 1400 - 1450°C | 2550 - 2640°F | | Modulus of Elasticity | 190 - 200 GPa | 27.6 - 29.0 × 10⁶ psi | | Thermal Conductivity (RT) | 16.4 W/m·K | 114 BTU·in/hr·ft²·°F | | Coefficient of Expansion (20-100°C) | 10.8 µm/m·°C | 6.0 µin/in·°F |
| Mechanical Properties (Condition A – Solution Annealed) | Metric | Imperial |
|---|
| Tensile Strength (max.) | 1100 MPa | 160 ksi | | Yield Strength (0.2% offset) | 550 MPa | 80 ksi | | Elongation | 45% | 45% | | Reduction of Area | 60% | 60% | | Hardness (Rockwell C) | 32 max. | 32 max. |
| Mechanical Properties (Aged Conditions) | Tensile Strength | Yield Strength | Elongation |
|---|
| H900 (482°C / 1h) | 1550 MPa (225 ksi) | 1450 MPa (210 ksi) | 8% | | H950 (510°C / 2h) | 1500 MPa (218 ksi) | 1400 MPa (203 ksi) | 9% | | H1000 (540°C / 4h) | 1380 MPa (200 ksi) | 1240 MPa (180 ksi) | 12% | | H1050 (566°C / 4h) | 1170 MPa (170 ksi) | 1030 MPa (150 ksi) | 15% |
2. Fabrication & Material ComparisonSolution Annealing (Condition A): 843-899°C (1550-1650°F) × 30 minutes, air cool or oil quench; produces soft, formable condition . Aging: 482-566°C (900-1050°F) × 1-4 hours, air cool; single-stage treatment develops full strength . Hot Working: 1010-1177°C (1850-2150°F); reheat as necessary . Cold Working: Excellent formability in Condition A; can be cold drawn, rolled, and formed . Machining: Good machinability in Condition A; requires sharp tools and positive feeds; aged condition more difficult . Welding: Good weldability using GTAW and GMAW; post-weld aging recommended to restore properties .
| Material Comparison | Custom 455 | 17-4 PH | 15-5 PH | Custom 465 |
|---|
| Yield Strength (max.) | 1450 MPa (210 ksi) | 1170 MPa (170 ksi) | 1170 MPa (170 ksi) | 1650 MPa (240 ksi) | | Corrosion Resistance | Good (430 level) | Good | Good | Excellent | | Formability (Annealed) | Excellent | Good | Good | Good | | Single-Stage Aging | Yes | Yes | Yes | Yes | | Ductility (Aged) | 8-15% | 10-15% | 10-15% | 6-10% | | Toughness | Good | Moderate | Good | Excellent | | Primary Use | Aerospace, fasteners | General PH | Aerospace | Ultra-high strength |
3. ApplicationsAerospace Structural Components: Landing gear components, structural brackets, actuator parts High-Strength Fasteners: Bolts, studs, nuts, and screws requiring 150-210 ksi tensile strength Shafts & Bushings: High-strength rotating components, bearing sleeves, wear surfaces Corrosion-Resistant Industrial Tooling: Molds, dies, and tooling requiring good corrosion resistance Precision Mechanical Parts: Components requiring high fatigue strength and dimensional stability Oil & Gas: Downhole components, valve stems, wellhead equipment Defense: Ordnance components, missile parts, armor applications
Contact ZYTC Alloy for certified AMS 5617L Custom 455 (UNS S45500) bar, wire, and forgings with complete traceability, certificates, and competitive pricing. Available in solution annealed (Condition A) and aged conditions (H900-H1050) for aerospace, fastener, and high-strength industrial applications. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
