AMS 5555 specification covers a corrosion-resistant nickel-copper alloy (Alloy 400 / UNS N04400) in the form of seamless tubing. Alloy 400 is a single-phase, solid-solution nickel-copper alloy that offers superior resistance to many corrosive environments over temperatures ranging from sub-zero to 427°C (800°F). This alloy is only hardenable through cold working, rather than heat treatment. The ratio of copper to nickel in Alloy 400 is almost identical to that found in the ore from which the metal is derived—approximately 2:1 nickel to copper. Alloy 400 seamless tube has been widely used in the marine industry and chemical processing industry for pumps, valves, propeller shafts, marine fixtures, electronic components, springs, chemical processing equipment, fresh and saltwater tanks, process vessels, piping, boiler feedwater heaters, and other heat exchangers . 1. Product Specifications & Physical Data Alloy 400 is available in seamless tube form for marine, chemical, and industrial applications requiring excellent corrosion resistance over a wide temperature range. Available Forms: Seamless tube, pipe, bar, sheet, plate, wire, fittings, and forgings . Specifications: AMS 5555, ASTM B165, ASME SB-165, UNS N04400, Werkstoff Nr. 2.4360 .
| Chemical Composition (Weight %) | Alloy 400 Specification |
|---|
| Nickel (Ni) | 63.0 - 70.0 | | Copper (Cu) | 28.0 - 34.0 | | Iron (Fe) | 2.5 max. | | Manganese (Mn) | 2.0 max. | | Silicon (Si) | 0.5 max. | | Carbon (C) | 0.3 max. | | Sulfur (S) | 0.024 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.80 g/cm³ | 0.318 lb/in³ | | Melting Range | 1300 - 1350°C | 2370 - 2460°F | | Modulus of Elasticity | 179 GPa | 26.0 × 10⁶ psi | | Thermal Conductivity (RT) | 21.8 W/m·K | 151 BTU·in/hr·ft²·°F | | Coefficient of Expansion (20-100°C) | 13.9 µm/m·°C | 7.7 µin/in·°F | | Electrical Resistivity | 0.547 µΩ·m | 0.547 µΩ·m | | Curie Temperature | 20 - 50°C (approx.) | 68 - 122°F |
| Mechanical Properties (Seamless Tube) | Condition | Metric | Imperial |
|---|
| Tensile Strength (min.) | Annealed | 480 MPa | 70 ksi | | Yield Strength (0.2% offset, min.) | Annealed | 170 MPa | 25 ksi | | Elongation (min.) | Annealed | 35% | 35% | | Tensile Strength (min.) | Cold Drawn | 550 MPa | 80 ksi | | Yield Strength (min.) | Cold Drawn | 380 MPa | 55 ksi | | Elongation (min.) | Cold Drawn | 15% | 15% | | Hardness (Annealed) | — | 110 HB | 110 HB | | Hardness (Cold Drawn) | — | 180 HB | 180 HB |
2. Fabrication & Material ComparisonAnnealing: 843-871°C (1550-1600°F) × 10-30 minutes, water quench or air cool; relieves cold work stresses and restores ductility . Hot Working: 927-1177°C (1700-2150°F); reheat as necessary; avoid working below 871°C . Cold Working: Good formability; can be cold drawn, rolled, and bent; work-hardening rate moderate . Machining: Good machinability; requires sharp tools, positive feeds, and adequate lubrication . Welding: Excellent weldability using GTAW (TIG), GMAW (MIG), and resistance welding; matching filler metal (ERNiCu-7) recommended .
| Material Comparison | Alloy 400 | Alloy K-500 | Alloy 200 | 316L Stainless |
|---|
| Nickel Content | 63-70% | 63-70% | 99.0% min. | 10-14% | | Copper Content | 28-34% | 27-33% | 0.25% max. | — | | Strengthening | Solid-solution | Age-hardened | Solid-solution | Solid-solution | | Seawater Corrosion | Excellent | Excellent | Good | Good | | Stress Corrosion Cracking | Resistant | Resistant | Resistant | Susceptible | | Hydrofluoric Acid | Excellent | Excellent | Good | Poor | | Magnetic at RT | Weakly magnetic | Weakly magnetic | Strongly magnetic | Non-magnetic | | Yield Strength (Annealed) | 170 MPa | 340 MPa | 105 MPa | 170 MPa | | Primary Use | Marine, chemical, HF acid | High-strength marine, springs | Caustic, electronics | General marine |
3. Applications Marine: Seawater piping systems, propeller shafts, pump and valve components, marine fixtures and fasteners, boat hull fittings Chemical Processing: Process vessels, piping systems, heat exchangers, boiler feedwater heaters, chemical tanks, reactor vessels Oil & Gas: Downhole components, wellhead equipment, sour gas service Electronics: Electronic components, springs, connectors Aerospace: Fuel systems, hydraulic systems, pneumatic systems Power Generation: Condenser tubing, feedwater heaters, heat exchangers Fresh & Salt Water Tanks: Storage tanks for water and brine service HF Acid Service: Equipment for handling hydrofluoric acid in alkylation units
Contact ZYTC Alloy for certified AMS 5555 Alloy 400 seamless tube with complete traceability, certificates, and competitive pricing. Available in annealed and cold-drawn conditions for marine, chemical processing, and industrial applications. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
