G-CoCr28 (EN 2.4778) Cobalt-base Alloys Casting Material
Cobalt-base Alloys
Introduction
G-CoCr28 is a cobalt-base alloy grade covered by EN 10295. Typical applications include heat-resistant cast components.
| Field | Value |
|---|---|
| Designation | G-CoCr28 (EN 2.4778) |
| Material Type | Cobalt Alloy |
| Sub Type | Cobalt-base Alloys |
| Product Form | casting |
Manufacturing Process
Equivalent Materials
N/A
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| EN 10295 | Heat resistant steel castings | 2002 | G-CoCr28 | — |
Related Casting Products
Physical Properties
| Property | Value / Unit | Note | Source |
|---|---|---|---|
| Density | 8.1 kg/dm³ | EN 10295 | |
| Specific Heat | 500 J/(kg·K) | Temperature: 20 °C | EN 10295 |
| Thermal Conductivity | 8.5 W/(m·K) | Temperature: 20 °C | EN 10295 |
| Thermal Conductivity | 21 W/(m·K) | Temperature: 800 °C | EN 10295 |
| Thermal Expansion | 15 ×10⁻⁶/K | Temperature range: 20–400 °C | EN 10295 |
| Thermal Expansion | 16 ×10⁻⁶/K | Temperature range: 20–800 °C | EN 10295 |
| Thermal Expansion | 17 ×10⁻⁶/K | Temperature range: 20–1000 °C | EN 10295 |
Chemical Composition
| Element | EN 10295Edition 2002 · wt.%Cast analysis |
|---|---|
| C | 0.05–0.25 |
| Si | 0.50–1.50 |
| Mn | ≤ 1.50 |
| P | ≤ 0.040 |
| S | ≤ 0.030 |
| Cr | 27.00–30.00 |
| Ni | ≤ 4.00 |
| Fe | balance |
| Co | 48.0–52.0 |
| Mo | ≤ 0.50 |
| W | ≤ 0.60[1] |
| Nb | ≤ 0.50 |
| V | ≤ 0.12[1] |
| Cu | ≤ 0.25[1] |
Notes
EN 10295 · Edition 2002
[1] W/V/Cu: Unless otherwise agreed: limit for element unspecified in; no intentional addition except for finishing the heat.
Heat Treatment
EN 10295–2002
N/A
Mechanical Properties
Core Mechanical Properties
EN 10295 — 2002 · Table 2 — Normative
| Property | As cast / no heat treatment |
|---|---|
| Yield Strength | ≥ 235 MPa |
| Tensile Strength | ≥ 490 MPa |
| Elongation | ≥ 6 % |
- Room temperature
Additional Mechanical Properties
Creep & Stress-Rupture Properties
| Property | Value / unit | Temperature / conditions | Nature | Source / edition | Notes |
|---|---|---|---|---|---|
| σ1% — mean stress for 1% elongation | 70 MPa | Temperature: 700 °C; Load time: 10000 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
| σ1% — mean stress for 1% elongation | 34 MPa | Temperature: 800 °C; Load time: 10000 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
| σr — mean rupture stress | 48 MPa | Temperature: 900 °C; Load time: 100 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
| σr — mean rupture stress | 25 MPa | Temperature: 900 °C; Load time: 1000 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
| σ1% — mean stress for 1% elongation | 16 MPa | Temperature: 900 °C; Load time: 10000 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
| σr — mean rupture stress | 23 MPa | Temperature: 1000 °C; Load time: 100 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
| σr — mean rupture stress | 12 MPa | Temperature: 1000 °C; Load time: 1000 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
| σ1% — mean stress for 1% elongation | 9.5 MPa | Temperature: 1000 °C; Load time: 10000 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
| σ1% — mean stress for 1% elongation | 4 MPa | Temperature: 1100 °C; Load time: 10000 h | Informative | EN 10295–2002 · EN 10295:2002, Annex B, Table B.1 (informative) | Mean values; ±20% scatter band; information only, not acceptance requirements; Mean creep values from a scatter band of ±20%; information only. |
Welding Conditions
N/A
Applications
Cobalt-base alloys EN 10295 G-CoCr28 is used for heat-resistant cast components. EN 10295:2002 gives an informative maximum use temperature in air of 1200 °C, based on oxidation resistance in clean natural air. For cyclic heating, this in-air guidance is reduced to 1100 °C. These figures are not guaranteed continuous or intermittent service temperatures, or allowable temperatures under load; other atmospheres require separate assessment.
Other cast components used in this material family include furnace fixtures, support elements and burner-assembly components. These applications include industrial heating and heat-treatment equipment. Atmosphere, loading, direct flame exposure, cyclic operation and process deposits must be considered separately from an in-air reference temperature.
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