Need a carburetant with high purity and low sulfur?

What foundries quietly obsess over: a good carburetant

In steel and iron shops, the unsung hero isn’t the furnace or the ladle—it's the tiny black granules that nudge carbon to exactly where the metallurgist wants it. The product I’ve seen turning heads lately is the Supply Low Sulphur Carbon Additive 90% Carbon Content Recarburizer Carburizing Agent from Nalai. To be honest, the naming is a mouthful, but the performance data? Surprisingly tidy.

Industry trends, in plain words

Foundries are shifting toward low-sulfur, low-nitrogen, graphitized carburetant to stabilize melt chemistry, trim slag volumes, and meet ESG targets. Short answer: fewer inclusions, cleaner iron, better machinability. Many customers say the real-world recarburization efficiency of high-grade graphite additives sits around 85–95%, depending on furnace type and charge practice. Actually, that checks out with the lab sheets I’ve reviewed.

Technical snapshot and specs

This Nalai-grade carburetant is a high-carbon, low-S, low-N graphite-based additive. Typical use: ductile iron (nodular), gray iron, and secondary steel metallurgy in ladle or furnace correction.

From raw material to melt: process flow

• Materials: high-purity carbon precursors, graphitized at ≈2800°C for low ash and high fixed carbon.
• Methods: crushing, magnetic removal, multi-stage screening (ISO 3310), anti-dust conditioning.
• Testing: C/S/N by combustion/IR (ASTM E1019); sampling per ISO 14284; moisture per ISO 760.
• Service life: storage 12–18 months in dry indoor conditions; real-world use may vary.
• Industries: automotive castings, pump housings, pipe/fittings, steel ladle metallurgy, forgings.

Applications and real results

Use the carburetant in the furnace during melt-down for rapid assimilation, or in ladle for fine-tuning CE and carbon. In ductile iron, the low S keeps your Mg treatment from fighting uphill. One mid-size foundry (3-ton coreless induction) reported cutting carbon losses by ≈7% and improving CE stability from ±0.06 to ±0.03—small numbers, big machining wins.

Origin, for those asking about traceability: Qiujing yiyuan, No. 189, East 2nd Ring North Road, Chang’an District, Shijiazhuang, Hebei Province. Documentation can include COA and, when requested, EN 10204 3.1 test summaries.

Vendor landscape: how Nalai stacks up

Customization, QA, and paperwork

Customization is available—particle size, packing, and target analyses (within reason). Testing follows ASTM E1019 and ISO 14284 sampling. Customers often request nitrogen control for thin-wall DI and a tighter S cap; Nalai can tailor those. Sample? Yes, available. I guess it’s worth trialing one heat first, then scaling.

Compliance and documentation can include ISO 9001/14001 (where applicable), REACH statements for EU shipments, and EN 10204 3.1. Always verify certificates; that’s not me being picky—it’s just good practice.

Field notes and feedback

Operator comments I keep hearing: cleaner slag, steadier CE, less blowhole drama. The carburetant seems to wet-in quickly when added to a vigorous bath, especially in coreless induction. One caveat—don’t dump it into a cold, oxidizing melt and expect miracles; timing and turbulence matter.

Citations

1. ASTM E1019: Standard Test Methods for Determination of C, S, N, O, and H in Steel, Iron, and Related Alloys.
2. ISO 14284: Steel and iron — Sampling and preparation of samples for the determination of chemical composition.
3. AFS (American Foundry Society) guidance on recarburizer selection and melt practice, technical papers and proceedings.
4. EN 10204:2004, Metallic products — Types of inspection documents.
5. ISO 9001:2015 Quality management systems — Requirements.