Alloy 20 Round Bar (UNS N08020)
Alloy 20 Round Bar is a nickel–iron–chromium alloy with added molybdenum and copper, specifically developed for excellent resistance to sulfuric acid and aggressive chemical environments. It offers a unique combination of outstanding corrosion resistance, good mechanical strength, and excellent fabricability, making it a preferred material in chemical processing industries.
Alloy 20 Round Bar (also known as Carpenter 20 / Incoloy Alloy 20 Round Bar) is highly resistant to pitting, crevice corrosion, and chloride-induced stress corrosion cracking. It performs reliably in both oxidizing and reducing conditions and maintains stable properties across a wide temperature range.
Key Features
- Excellent resistance to sulfuric acid and phosphoric acid
- High resistance to pitting and crevice corrosion
- Good resistance to chloride stress corrosion cracking
- Excellent weldability without stabilization heat treatment
- Good strength and toughness at elevated temperatures
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N08020 |
| DIN | 2.4660 |
| EN | NiCr20CuMo |
| JIS | NW 8020 |
Sizes
| Diameter Range | Length |
|---|---|
| 6 mm – 300 mm | 3 m, 6 m, Cut to Length |
| Custom Sizes | As per requirement |
Alloy 20 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 32.0 – 38.0 |
| Chromium (Cr) | 19.0 – 21.0 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Copper (Cu) | 3.0 – 4.0 |
| Niobium (Nb) | 8 × C min |
| Carbon (C) | ≤ 0.07 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
UNS N08020 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 550 MPa |
| Yield Strength | ≥ 240 MPa |
| Elongation | ≥ 30% |
| Hardness | ~180 HB |
Incoloy Alloy 20 Physical Properties
| Property | Value |
|---|---|
| Density | 8.08 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | ~11.3 W/m·K |
| Electrical Resistivity | ~0.95 µΩ·m |
Types of UNS N08020 Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Annealed Round Bar
- Bright / Precision Ground Round Bar
- Forged Round Bar
Applications
- Sulfuric acid processing equipment
- Chemical reactors and storage tanks
- Heat exchangers and condensers
- Pharmaceutical and food processing equipment
- Pulp and paper industry equipment
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