Hastelloy C4 Round Bar (UNS N06455)
Hastelloy C4 Round Bar is a nickel–chromium–molybdenum alloy known for its excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in both oxidizing and reducing environments. With low carbon and silicon content, Hastelloy C4 offers exceptional thermal stability, minimizing carbide precipitation during welding or high-temperature exposure.
Hastelloy C4 Round Bar (also referred to as Alloy C4 Round Bar) performs reliably in aggressive chemical processing conditions, particularly where contamination from intergranular corrosion must be avoided. It maintains good mechanical strength at elevated temperatures and is well-suited for fabrication and welding without post-weld heat treatment in most cases.
Key Features
- Excellent resistance to pitting and crevice corrosion
- High resistance to stress corrosion cracking
- Outstanding thermal stability
- Suitable for both oxidizing and reducing environments
- Good weldability and fabricability
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06455 |
| DIN | 2.4610 |
| EN | NiCrMo16 |
| AFNOR | NC16D |
Sizes
| Diameter Range | Length |
|---|---|
| 6 mm – 300 mm | 3 m, 6 m, Cut to Length |
| Custom Sizes | As per customer requirement |
Hastelloy C4 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 14.0 – 18.0 |
| Molybdenum (Mo) | 14.0 – 17.0 |
| Iron (Fe) | ≤ 3.0 |
| Carbon (C) | ≤ 0.01 |
| Silicon (Si) | ≤ 0.08 |
| Manganese (Mn) | ≤ 1.0 |
UNS N06455 Mechanical Properties (Annealed)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 690 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 40% |
| Hardness | ~200 HB |
Alloy C4 Physical Properties
| Property | Value |
|---|---|
| Density | 8.64 g/cm³ |
| Melting Range | 1325 – 1370°C |
| Thermal Conductivity | ~11.0 W/m·K |
| Electrical Resistivity | ~1.25 µΩ·m |
Types of Hastelloy C4 Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Annealed Round Bar
- Bright / Precision Ground Round Bar
- Forged Round Bar
Applications
- Chemical processing equipment
- Heat exchangers and reactors
- Pollution control systems
- Acid production plants
- Petrochemical and pharmaceutical industries
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