Alloy Wire International
Datasheet: Alloy 20 CB 3
Alloy 20 CB 3
Alloy 20 CB 3 is an austenitic stainless steel with excellent resistance to hot sulphuric acid and many other aggressive environments that would readily attack stainless steel 316. Alloy 20 CB 3 exhibits superior resistance to stress-corrosion cracking in boiling 20 to 40% sulphuric acid, and is commonly used for chemical, pharmaceutical and food processing, as well as in tanks, piping, heat exchangers and much more.
Available in all profile options
Key Features
Alloy 20 CB 3 offers the following key features:
Excellent resistance to hot sulphuric acid & many other aggressive environments that would attack ST/ST 316.
Superior resistance to stress corrosion cracking in boiling 20 – 40% sulphuric acid.
Typical Applications
Alloy 20 CB 3 is known to be suitable for the following applications:
Chemical and allied industries
Processing of synthetic rubber
High-octane gasoline
Solvents
Pharmaceuticals
Agrichemicals
Designations
W.Nr 2.4660
UNS N08020
AWS 130
Specifications
ISO 15156-3
(NACE MR 0175)
Chemical Composition
The chemical composition of Alloy 20 CB 3 is indicated in the table below:
| Element | Min % | Max % |
|---|---|---|
| C | – | 0.07 |
| Si | – | 1.00 |
| Mn | – | 2.00 |
| P | – | 0.045 |
| S | – | 0.035 |
| Cr | 19.00 | 21.00 |
| Mo | 2.00 | 3.00 |
| Ni | 32.50 | 38.00 |
| Cu | 3.00 | 4.00 |
| Nb | 8 x C | 1.00 |
| Fe | bal |
Alloy Details
Alloy 20 CB 3 density, melting point, coefficient of expansion, modulus of rigidity, and elasticity is indicated in the table below:
| Density | Melting Point | Coefficient of Expansion | Modulus of Rigidity | Modulus of Elasticity |
|---|---|---|---|---|
| 8.08 g/cm³ | 1425 °C | 14.69 μm/m °C (20 – 100 °C) | 73.6 kN/mm² | 193 kN/mm² |
| 0.292 lb/in³ | 2600 °F | 8.16 x 10-6 in/in °F (70 – 212 °F) | 10675 ksi | 27993 ksi |
Heat treatment of finished parts
The typical heat treatment of Alloy 20 CB 3:
| Condition as supplied by AWI | Type | Temperature | Time | Cooling |
|---|---|---|---|---|
| Annealed or Spring Temper | Stress Relieve | 250 – 530 °C (480 – 990 °F) | 1 Hr | Air |
Properties
The typical mechanical properties of Alloy 20 CB 3:
| Annealed | ||
|---|---|---|
| Approx. tensile strength | <900 N/mm² | <131 ksi |
| Approx. operating temperature | -200 to +300 °C | -330 to +570 °F |
| Spring Temper | ||
|---|---|---|
| Approx. tensile strength | 1200 – 1800 N/mm² | 174 – 261 ksi |
| Approx. operating temperature | -200 to +300 °C | -330 to +570 °F |
The above tensile strength ranges are typical. If you require different please ask.
