Alloy 20 (Carpenter 20)
Iron-nickel-chromium alloy with molybdenum and copper developed for sulfuric-acid service.
Material overview
Alloy 20 (Carpenter 20) is included in the Nickel-Based Alloys catalog. Iron-nickel-chromium alloy with molybdenum and copper developed for sulfuric-acid service. Key characteristics for evaluation include Excellent resistance to sulfuric acid and many other media, resists chloride stress corrosion, and good mechanical properties. Typical applications include Sulfuric acid production, chemical and pharmaceutical, food and dye production, heat exchangers, and pickling. The dataset currently includes 14 property records covering chemical composition, mechanical properties, and physical properties. Associated standards include B473, B472, and GB/T 15007, and product form records cover Plate, Forged Product, and Bar / Rod. Final chemistry, mechanical properties, heat treatment, dimensions, inspection, and documentation must be confirmed against the applicable specification and mill certificate.
Key characteristics
- Excellent resistance to sulfuric acid and many other media
- resists chloride stress corrosion
- good mechanical properties
Typical applications
- Sulfuric acid production
- chemical and pharmaceutical
- food and dye production
- heat exchangers
- pickling
Grade names and equivalents
Technical properties
Typical values are for reference only. Final chemistry, mechanical properties, heat treatment, dimensions, inspection, and documentation are confirmed against the applicable specification and MTC/COA before order acceptance.
Chemical composition
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Ni | 32.0-38.0 | wt% | Typical value |
| Cr | 19.0-21.0 | wt% | Typical value |
| Fe | balance | wt% | Typical value |
| Cu | 3.0-4.0 | wt% | Typical value |
| Mo | 2.0-3.0 | wt% | Typical value |
| Nb | 8xC-1.0 | wt% | Typical value |
| C | 0.07 max | wt% | Typical value |
| Mn | 2.0 max | wt% | Typical value |
| Si | 1.0 max | wt% | Typical value |
Mechanical properties
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Tensile strength | min 551 | MPa | Annealed |
| Yield strength 0.2% | min 241 | MPa | Annealed |
| Elongation | min 30 | % | Annealed |
Physical properties
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Density | 8.05 | g/cm3 | Typical |
| Melting range | 1357-1430 | C | Typical |
Standards and specifications
Forms, applications, and capabilities
Industries
- Petrochemical & Chemical
- Industry