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Product Overview
Aerospace components withstand alternating loads and extreme temperature changes; petrochemical and nuclear equipment operates in corrosive media; marine structures are exposed to seawater erosion; medical devices require strict standards for safety and hygiene.
Custom 455® (UNS S45500) is a martensitic age-hardenable stainless steel developed for high-end severe working conditions. It combines ultra-high strength, reliable corrosion resistance and excellent workability, outperforming conventional martensitic stainless steels and serving as a premium alloy for advanced industrial applications.
Core Performance Advantages
Custom 455® offers corrosion resistance comparable to 304 austenitic stainless steel, suitable for atmospheric and mildly corrosive environments. It has higher strength and better toughness than regular martensitic grades such as 410 and 420. Compared with Custom 450®, it reaches an ultra-high strength level.
The material is easy to machine, hot/cold form and weld with low embrittlement risk. Its simple aging heat treatment can greatly improve mechanical properties, ensuring convenient production and fabrication.
Custom 455® Physical & Thermal Properties
| Property | Metric | Imperial |
| Density | 7.80 g/cm³ | 0.281 lb/in³ |
| Modulus of Elasticity | 196 GPa | 28.4 × 10⁶ psi |
| Magnetism | Magnetic | Magnetic |
| Thermal Conductivity (Room Temp.) | 16.3 W/(m·°C) | 9.4 Btu/(ft·h·°F) |
| Coefficient of Thermal Expansion (20~100°C) | 10.8 × 10⁻⁶ /°C | 6.0 × 10⁻⁶ /°F |
UNS S45500 Chemical Composition (Mass Fraction)
Compliant with ASTM A564, ASTM A693, AMS 5617, AMS 5860.
| Element | Content Range (%) | Typical Value (%) |
| Fe | Balance | Balance |
| Cr | 11.0~12.5 | 11.8 |
| Ni | 7.5~9.5 | 8.5 |
| Cu | 1.5~2.5 | 2.0 |
| Ti | 0.8~1.4 | 1.1 |
| Nb+Ta | 0.10~0.50 | 0.25 |
| Mo | ≤0.5 | 0.2 |
| Si | ≤0.5 | 0.3 |
| Mn | ≤0.5 | 0.3 |
| C | ≤0.05 | 0.02 |
| P | ≤0.04 | 0.02 |
| S | ≤0.03 | 0.01 |
Mechanical Properties
| Condition | Yield Strength | Tensile Strength | Hardness (HRC) | Elongation | Charpy V-Notch Impact Energy |
| Solution Annealed | ≤1105 MPa(≤160 ksi) | ≤1250 MPa(≤181 ksi) | ≤36 | ≥12% | ≥27 J |
| Aged | ≥1380 MPa(≥200 ksi) | ≥1480 MPa(≥215 ksi) | 46~50 | ≥8% | ≥16 J |
Material Performance Comparison
| Grade | Corrosion Resistance | Maximum Tensile Strength | Overall Toughness | Typical Application |
| 304 | Excellent | Medium | Excellent | General corrosion-resistant equipment |
| 410 | Fair | Medium-High | Poor | Common structural parts, cutlery |
| Custom 450® | Good | High | Good | Medium & high strength anti-corrosion components |
| Custom 455® | Good | Ultra-High | Very Good | Ultra-high strength precision parts |
Heat Treatment, Machining & Welding Guidelines
Heat Treatment
Solution Annealing: Heat to 1000~1060°C and hold sufficiently, then cool by air or water. The material obtains low hardness and good ductility for further processing.
Age Hardening: Hold annealed parts at 480~538°C for 3 to 4 hours, then air cool. Precipitation strengthening is achieved while retaining good toughness.
Processing Notes
- Machining: Excellent machinability in solution annealed condition. Use carbide tools with standard parameters. Reduce cutting speed and feed rate and apply sufficient coolant after aging treatment.
- Welding: GTAW (TIG) and GMAW (MIG) are recommended. Complete welding before aging. Low-temperature preheating is recommended. Post-weld aging treatment restores strength and prevents intergranular corrosion and cracking. Oxyacetylene welding is not allowed.
Product Forms & Size Range
We supply a full range of Custom 455® products with customized dimensions:
Bars: Diameter 6mm ~ 300mm, round bar, square bar, hexagon bar
Pipes & Fittings: Seamless pipes, elbows, flanges and joints
Plates & Forgings: Sheets, plates, open die forgings, closed die forgings
Wires: Precision cold drawn wires for fasteners and springs
Applications & Typical Cases
1.Aerospace: Fasteners, structural connectors and precision components for aero-engines
2.Petrochemical & Nuclear Power: High-pressure valve internals, drilling tools, nuclear auxiliary parts
3.Marine Engineering: High-strength connectors and corrosion-resistant components for offshore platforms
4.Medical Equipment: Surgical instruments, medical auxiliary components
5.General Machinery: High-strength mold parts and precision transmission components
FAQ
1.Q: Is Custom 455® magnetic? A: Yes, it is magnetic as a martensitic stainless steel.
2.Q: Will welding reduce material strength? A: Welding causes local strength loss. Post-weld aging treatment can restore full performance.
3.Q: Can it replace 304 stainless steel? A: Similar corrosion resistance, much higher strength. It is ideal for applications requiring both corrosion resistance and ultra-high strength.
4.Q: What delivery conditions are available? A: Solution annealed and aged conditions are available as per customer requirements.
C&N’s Service
Custom 455® (UNS S45500) martensitic precipitation hardening stainless steel is the ideal choice for services requiring corrosion resistance and ultra-high mechanical strength.
We provide customized processing for Custom 455® bars, pipes, fittings, plates and forgings. We also support precision machining and third-party inspection. Please contact us for technical support, material selection and quotation.
