Foundry buyers should define a carburizing material by the melt route, not only by fixed carbon. Furnace type, base iron, addition stage and target chemistry affect how a trial should be designed and measured.
Establish the chemistry window
State the required fixed carbon and limits for sulfur, ash, volatile matter, moisture and phosphorus. Confirm the analysis method and whether the values are acceptance limits or typical targets.
Match particle size to addition practice
The Zhonghao catalogue lists 1–3 mm, 3–5 mm and 3–8 mm references. Select the appropriate range based on handling, addition point and dissolution expectations, then define fines tolerance.
Measure the trial
Record charge weight, addition timing, carbon recovery and any slag or handling observations. The order should state the final specification, sampling, packing and inspection procedure.
Sources used for this article
- Zhonghao formal product catalogue, page 2, Anhydrous Semi Coke Index