Standard: ISO 18894 · ISO 556 · ISO 728 · ASTM D5341 · ASTM D3402
The values below are typical ranges seen in contracts and plant specifications, not limits from a standard. Each blast furnace sets its own targets, and premium furnaces with high coal injection need coke at the strong end of every range.
Chemistry is given on a dry basis. Strength indices depend on the test method, so a contract should name it — an M40 by ISO 556 and a stability index by ASTM D3402 are different numbers.
| Parameter | Unit | Blast-furnace coke | Foundry coke | Test method |
|---|---|---|---|---|
| Ash (dry) | % | 10–13 | 8–10 | ISO 1171 · ASTM D3174 |
| Volatile matter (dry) | % | below 1.2 | below 1.0 | ISO 562 · ASTM D3175 |
| Fixed carbon (dry) | % | 85–89 | 88–91 | by difference |
| Total sulphur (dry) | % | 0.5–0.8 | below 0.7 | ISO 19579 · ASTM D4239 |
| Phosphorus (dry) | % | below 0.03 | below 0.03 | ISO 622 |
| Total moisture (as delivered) | % | 1–6 (dry-quenched below 1) | below 5 | ISO 579 |
| M40 (drum strength) | % | above 80 | above 80 | ISO 556 |
| M10 (abrasion) | % | below 7 | below 8 | ISO 556 |
| Stability index | % | above 55 | – | ASTM D3402 |
| CRI (reactivity) | % | 20–30 | – | ISO 18894 · ASTM D5341 |
| CSR (strength after reaction) | % | 60–70 | – | ISO 18894 · ASTM D5341 |
| Size range | mm | 25/30–80 | above 80–100 | ISO 728 · ASTM D293 |
| Mean size | mm | 45–60 | 100–150 | ISO 728 |
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