Designation
- Grade
- G20Mn5 (1.6220)
- UNS
- —
- EN designation
- 1.6220 (G20Mn5)
- Standard
- EN 10293, EN 10213
- Density
- ≈ 7.85 g/cm³
- Usual delivery condition
- Normalised
Chemical composition
| Element | Mass fraction, % |
|---|---|
| C | 0.17–0.23 |
| Mn | 1.00–1.60 |
| Si | ≤ 0.60 |
| Ni | ≤ 0.80 |
| Fe | bal. |
Main elements only. Phosphorus, sulphur and residual-element limits are specified in the standard and are not reproduced here.
Mechanical properties
| Condition | Tensile strength Rm, min. (MPa) | Yield strength Rp0.2, min. (MPa) | Elongation, min. (%) |
|---|---|---|---|
| Normalised | 480–620 | 300 | 20 |
Minimum values (or ranges) for separately cast test bars as specified in EN 10293, EN 10213.
Characteristics
- Corrosion and oxidation behaviour
- Not corrosion resistant; coating or other protection required in corrosive environments
- Weldability
- Good with matching filler and standard procedures
- Machinability
- Good in the appropriate heat-treatment condition
- Typical applications
- Valves Pumps Low-temperature service Pressure parts
International cross-reference
| System | Designation | Relationship |
|---|---|---|
| ASTM | LCC (ASTM A352/A352M) | Comparable properties |
Casting and processing considerations
Good castability and moderate pouring temperatures. Surface decarburisation from the reaction between metal, shell and atmosphere has to be considered on heat-treated and wear surfaces; machining allowance or a controlled furnace atmosphere are common countermeasures. Section-size sensitivity of quenched and tempered grades should be reflected in the drawing requirements.
Reference data compiled from the cited standards for orientation. Always work from the current edition of the governing specification; values are not a guaranteed LOSTWAX TR delivery specification.
Other grades in this family
WCB GP240GH (1.0619) LCC WC6 G17CrMo5-5 (1.7357) WC9 G17CrMo9-10 (1.7379) 4140 G42CrMo4 (1.7231) 8620