Alloy N06455 (C-4) — High-Performance Nickel-Molybdenum-Chromium Alloy
Product Description
FUSHUN METAL’s Alloy N06455 (C-4) is an austenitic nickel-molybdenum-chromium alloy with low carbon, silicon, and iron content specifically designed for exceptional corrosion resistance in aggressive chemical environments. This versatile alloy exhibits a significantly lower tendency to form precipitates in the temperature range between 650 and 1,040°C (1,202-1,904°F), which substantially improves its resistance to inter-crystalline corrosion. When properly machined, no knife line attack occurs in the heat-affected zones of welded joints.
With its balanced chemical composition, Alloy N06455 delivers extraordinary resistance to a wide range of corrosive media, including contaminated reducing mineral acids. The high nickel concentration makes it practically immune to chloride-induced stress corrosion cracking, even in hot chloride solutions. This unique combination of properties makes Alloy N06455 the material of choice for demanding applications in chemical processing, pharmaceuticals, and pollution control equipment.
Key Advantages
- Exceptional resistance to a wide range of corrosive media, particularly under strongly oxidizing conditions
- Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking
- Approved for pressure vessels in temperature range from -196 to 400°C (-320 to 752°F)
- Superior structural stability with minimal precipitation formation
- Excellent weldability with proper techniques
- Good formability both hot and cold
- High mechanical strength across a wide temperature range
Standards and Specifications
Alloy N06455 (C-4) from FUSHUN METAL meets the following industry standards and specifications:
| Standard | Designation |
|---|---|
| UNS | N06455 |
| EN | 2.4610 |
| EN | NiMo16Cr16Ti |
| ISO | NiMo16Cr16Ti |
| ASTM/ASME | B575/SB575 |
| DIN | 17744, 17751 |
| VdTÜV | 424 |
| NACE | MR0175/ISO 15156, MR0103/ISO 17945 |
Chemical Composition
FUSHUN METAL produces Alloy N06455 with precise control of chemical composition according to industry standards:
| Element | Min. % | Max. % |
|---|---|---|
| Nickel (Ni) | Balance | – |
| Chromium (Cr) | 14.50 | 17.50 |
| Molybdenum (Mo) | 14.00 | 17.00 |
| Iron (Fe) | – | 3.00 |
| Titanium (Ti) | – | 0.70 |
| Carbon (C) | – | 0.009 |
| Manganese (Mn) | – | 1.00 |
| Silicon (Si) | – | 0.050 |
| Sulfur (S) | – | 0.010 |
| Phosphorus (P) | – | 0.020 |
| Cobalt (Co) | – | 2.00 |
Physical Properties
Alloy N06455 (C-4) exhibits the following physical properties:
| Property | Value (Imperial) | Value (Metric) |
|---|---|---|
| Density | 537 lb/ft³ at 68°F | 8.6 g/cm³ at 20°C |
| Melting Range | 2,430-2,520°F | 1,335-1,380°C |
| Thermal Conductivity at 68°F (20°C) | 70 BTU·in/sq.ft·h·°F | 10.1 W/m·K |
| Electrical Resistivity at 68°F (20°C) | – | 124 μΩ·cm |
| Modulus of Elasticity at 68°F (20°C) | 30.6 × 10⁶ ksi | 211 GPa |
| Coefficient of Thermal Expansion (68-212°F/20-100°C) | 6.06 × 10⁻⁶/°F | 10.9 × 10⁻⁶/K |
Mechanical Properties
FUSHUN METAL’s Alloy N06455 (C-4) offers excellent mechanical properties in the solution-annealed condition:
| Product Form | Dimensions | 0.2% Yield Strength | 1.0% Yield Strength | Tensile Strength | Elongation |
|---|---|---|---|---|---|
| Sheet/Plate | ≤ 5 mm (≤ 0.197″) | ≥ 305 MPa (≥ 44.2 ksi) | ≥ 340 MPa (≥ 49.3 ksi) | 700-900 MPa (102-131 ksi) | ≥ 40% |
| Sheet/Plate | 5-20 mm (0.197-0.787″) | ≥ 300 MPa (≥ 43.5 ksi) | ≥ 330 MPa (≥ 47.9 ksi) | 700-900 MPa (102-131 ksi) | ≥ 40% |
| Sheet/Plate | 20-65 mm (0.787-2.56″) | ≥ 280 MPa (≥ 40.6 ksi) | ≥ 315 MPa (≥ 45.7 ksi) | 700-900 MPa (102-131 ksi) | ≥ 40% |
| Bar | ≤ 250 mm (≤ 9.84″) | ≥ 280 MPa (≥ 40.6 ksi) | ≥ 315 MPa (≥ 45.7 ksi) | 700-900 MPa (102-131 ksi) | ≥ 40% |
Impact Toughness
Alloy N06455 exhibits excellent impact toughness:
- At 20°C (68°F): Minimum 96 J (70.8 ft/lbf)
- At -196°C (-320°F): Minimum 80 J
Corrosion Resistance
The combination of chromium with high molybdenum concentration gives Alloy N06455 exceptional resistance to numerous corrosive environments:
- General Corrosion: Outstanding resistance to a wide range of chemical media, particularly in contaminated reducing mineral acids
- Localized Corrosion: Excellent resistance to pitting and crevice corrosion in chloride-containing environments
- Stress Corrosion Cracking: Practically immune to chloride-induced stress corrosion cracking, even in hot chloride solutions, due to high nickel content
- Intergranular Corrosion: Superior resistance to sensitization and intergranular attack due to low carbon content and minimal precipitate formation
Applications
Due to its excellent corrosion resistance and good mechanical properties, Alloy N06455 (C-4) is ideal for numerous applications in aggressive environments:
Chemical Processing
- Equipment for handling hot contaminated mineral acids
- Pickling bath regeneration systems
- Components for acetic acid production
- Equipment for chemical fertilizers and pesticides production
- Reactors and heat exchangers in severe corrosive environments
Other Industries
- Flue gas desulfurization systems
- Pharmaceutical processing equipment
- Pollution control systems
- Acid production and handling equipment
- Valves, pumps, and fittings for corrosive media
Fabrication
Alloy N06455 (C-4) can be fabricated using conventional techniques with proper consideration for its properties:
Hot Forming
Can be hot-formed in the temperature range between 1,080 and 900°C (1,976 and 1,652°F) with subsequent rapid cooling in water or air. Heat treatment after hot forming is required to achieve optimal properties.
Cold Forming
The alloy has a higher work hardening rate than austenitic stainless steels, which must be considered when selecting forming tools and planning processes. Intermediate annealing is necessary for major cold forming work. For cold forming of > 15%, solution annealing must be performed.
Heat Treatment
Solution annealing should be conducted at approximately 1,120°C (2,048°F). Cooling should be accelerated with water to achieve optimum corrosion properties. Fast air cooling can be performed for thicknesses less than 1.5 mm.
Machining
Machining should be performed in the solution-annealed condition. Due to the elevated work hardening rate compared to stainless steels, use lower cutting speeds and maintain continuous tool engagement. Adequate chip depth is important to cut below the previously formed strain-hardened zone.
Welding
Readily weldable using techniques similar to those for 300 series stainless steels. For optimal corrosion resistance, low heat input and proper filler metal selection are important. Preferred welding methods include GTAW (TIG) and GMAW (MIG). Post-weld heat treatments are normally not required.
Available Product Forms
FUSHUN METAL provides Alloy N06455 (C-4) in various product forms to meet diverse manufacturing requirements:
Sheet and Plate
- Cold rolled: 1-7 mm (0.039-0.275″) thickness
- Hot rolled: 3-50 mm (0.118-1.97″) thickness
- Widths up to 2,500 mm (98.42″)
- Lengths up to 12,500 mm (492″)
Strip
- Thickness range: 0.025-3 mm (0.001-0.118″)
- Width range: 4-750 mm (0.157-29.5″)
- Available in coils or cut lengths
Rod and Bar
- Diameter range: 6-800 mm (0.236-31.5″)
- Lengths: 1,500-12,000 mm (59.1-472″)
- Available conditions: forged, rolled, drawn, heat treated
- Surface finish: oxidized, descaled, pickled, turned, peeled, ground or polished
Wire
- Drawn: 0.16-10 mm (0.006-0.4″)
- Hot rolled: 5.5-19 mm (0.22-0.75″)
- Available in various conditions: drawn bright, 1/4 hard to hard, bright annealed
- Supplied in rings, containers, on spools and headstocks
Other forms such as discs, rings, seamless or longitudinally welded pipes, and forgings are available upon request.
Why Choose FUSHUN METAL for Alloy N06455 (C-4)
Selecting FUSHUN METAL as your supplier for Alloy N06455 provides numerous advantages:
- Superior Quality: All products undergo rigorous testing to ensure consistent properties and performance
- Technical Expertise: Our metallurgists and engineers have extensive experience with nickel alloys and their applications
- Comprehensive Product Range: Available in sheet, plate, strip, bar, rod, and wire forms
- Custom Solutions: We can tailor products to meet your specific requirements
- Global Support: Technical assistance and reliable supply chain worldwide
- Competitive Pricing: Excellent value proposition for premium corrosion-resistant alloys
Request Information
Contact FUSHUN METAL today to discuss your Alloy N06455 (C-4) requirements. Our technical team is ready to assist you with:
- Material selection guidance
- Custom size and finish requirements
- Fabrication recommendations
- Price quotations and delivery schedules
- Material certification and testing
