Specifications
- Plate & Sheet: ASTM B463, ASME SB463
- Bar: ASTM B473, ASME SB473
- Seamless Pipe & Tube: ASTM B729, ASME SB729
Alloy 20, also known as “Carpenter 20” and “20CB-3”, was developed by Carpenter Technology as an upgrade to 316 Stainless. It is classified as a super-austenitic due to iron being its most abundant component. The UNS system classifies it as nickel-based alloy even though its nickel content is less than half. Alloy 20 resists hot sulfuric acid. It is often found in chemical mixers and fertilizer manufacturing equipment. Generally, it is an economical alternative to Alloy C276 and other higher nickel content materials.
Specifications & Technical Data
If your question isn’t answered below, download the technical data sheet here.
| Density | lb/in3 | 0.292 |
|---|---|---|
| g/cm | 8.08 | |
| Shear Modulus | 103 ksi | 11 |
| GPa | 76 | |
| Young’s Modulus | 103 ksi | 28 |
| GPa | 193 | |
| Specific Heat | Btu/lb•°F | 0.12 |
| J/kg•°C | 500 | |
| Electrical Resistivity | ohm•circ mil/ft | 651 |
| µΩ•m | 1.08 | |
| Thermal Conductivity | Btu•in/ft2 •h•°F | 85 |
| W/m•°C | 12.3 | |
| Coefficient of Expansion | 77-212°F, 10-6 in/in•°F | 8.2 |
| 25-100°C, µm/m•°C | 14.7 |
| Tensile Strength | ksi | 90 |
|---|---|---|
| MPa | 620 | |
| Yield Strength (0.2% Offset) | ksi | 45 |
| MPa | 300 | |
| Elongation, % | 40 | |
| Cold Reduction | Yield Strength (0.2% Offset) | Tensile Strength | Elongation | Hardness | ||
| % | ksi | MPa | ksi | MPa | % | Rockwell |
| 0* | 44.4 | 306 | 95.8 | 661 | 38 | B83 |
| 20 | 111.0 | 765 | 119.8 | 826 | 13 | C23 |
| 30 | 124.3 | 857 | 131.5 | 907 | 8 | C28 |
| 40 | 127.5 | 879 | 135.0 | 931 | 7 | C27 |
| 50 | 139.5 | 962 | 147.5 | 1017 | 4 | C30 |
| 60 | 139.9 | 965 | 149.3 | 1029 | 5 | C31 |
*Stabilize anneal
| Temperature | H2SO4, % | Corrosion Rate | ||
| °C | °F | % | mpy | mm/a |
| 50 | 122 | 70 | 2 | 0.051 |
| 60 | 140 | 20 | 0 | 0.000 |
| 60 | 140 | 70 | 3 | 0.076 |
| 60 | 140 | 90 | 4 | 0.102 |
| 75 | 167 | 70 | 5 | 0.127 |
| 85 | 185 | 20 | 18 | 0.457 |
| 85 | 185 | 70 | 7 | 0.178 |
| 85 | 185 | 90 | 15 | 0.381 |
| 95 | 203 | 90 | 27 | 0.686 |
| Boiling | 20 | 17 | 0.432 | |
| Shielded Metal Arc Welding | Gus Tungsten Arc Welding, Gas Metal Arc Welding |
| INCONEL welding electrode 112 | INCONEL filler metal 625 |
| INCONEL welding electrode 122 | INCONEL filler metal 622 |
| INCO-WELD welding electrode 686CPT® | INCO-WELD filler metal 686CPT® |
Hot forming should be in the range 1400-2150°F (7601175°C). INCOLOY alloy 020 is normally used in the annealed condition. Annealing: 1800-1850°F (9821010°C)/ for a time commensurate with section size/AC.
