Alloy 20
Wst. 2.4660
UNS N08020
Stock program: Available on request
Specification: ASTM B 729/ASME SB 729 / ASTM B 468/ASME SB 468 / NACE MR0175 / Seamless and welded condition
Maximum service temperature: 500°C / 930°F
Characteristics
- Superior resistance to stress-corrosion cracking in boiling 20 to 40% sulfuric acid
- Excellent general corrosion resistance to sulfuric acid
- Good mechanical properties and fabric ability
- Minimal carbide precipitations during welding
- Very good resistance to chloride stress-corrosion cracking
Market applications:
- Chemical processing industry
- Pharmaceutical and food plants
- Petrochemical process equipment
- Acid cleaning and pickling equipment
- Heat exchanges
Technical details
Technical composition (%) | Fe | Cr | Ni | Mo | Mn | Si | P | C | S | Nb | Cn | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
20 | min | Bal. | 19.0 | 32.0 | 2.0 | - | - | - | - | - | - | 3.0 |
max | - | 21.0 | 38.0 | 3.0 | 2.00 | 1.00 | 0.045 | 0.070 | 0.035 | 8xC (1.0 max) | 4.0 |
Mechanical properties | 20 |
---|---|
Tensile strenght (mpa, min) | 551 |
Yield strength (0.2% offset mpa, min) | 241 |
Elongation (%, min) | 30 |
Density / weight (g / cm3 / kg) | 8.1 |