Use case · GPC
Low-sulfur GPC recarburizer for ductile iron
For ductile iron, Jiushun GPC grades ZW01–ZW04 list sulfur ≤0.05% and nitrogen 100 ppm (ZW01), 200 ppm (ZW02/ZW03) or 300 ppm (ZW04). Buyers who need a stricter nitrogen ceiling should write it on the purchase order before production.
Common particle size in overseas enquiries: 1–5 mm. Other listed sizes remain available on the order.
| Grade | F.C. min | S max | Ash max | V.M. max | Moisture max | N |
|---|---|---|---|---|---|---|
| ZW01 | ≥99.0% | ≤0.05% | ≤0.5% | ≤0.5% | ≤0.50% | 100 ppm |
| ZW02 | ≥98.5% | ≤0.05% | ≤0.6% | ≤0.9% | ≤0.50% | 200 ppm |
| ZW03 | ≥98.5% | ≤0.05% | ≤0.7% | ≤0.8% | ≤0.50% | 200 ppm |
| ZW04 | ≥98.0% | ≤0.05% | ≤1.0% | ≤1.0% | ≤0.50% | 300 ppm |
Source: factory specification sheet. Indicators and particle sizes can be customised to the purchase order.
Procurement questions
- Why do ductile iron buyers care about sulfur and nitrogen?
- Sulfur from the recarburizer adds to the melt sulfur balance; nitrogen sensitivity varies by process. Jiushun publishes S ≤0.05% on all ZW grades and N 100–300 ppm by grade so you can lock ceilings on the PO.
- What nitrogen figures are on the sheet?
- On the Jiushun factory sheet, nitrogen is listed as 100 ppm (ZW01), 200 ppm (ZW02 and ZW03), and 300 ppm (ZW04). Buyers specifying ductile iron often request a nitrogen ceiling in writing before shipment.
- How should I enquire for ductile iron?
- Use the contact form, fill grade or “Not sure — advise”, particle size, quantity, and the optional nitrogen ceiling field. We reply the next business day (UTC+8).