Not all carbon additives are made equal—and choosing the wrong recarburizer could cost you thousands in low yield and contamination. Are you picking the right one?
The right recarburizer improves carbon recovery, reduces slag, and minimizes sulfur content—resulting in cleaner melts, better grain structure, and lower production costs.
If you're unsure whether to choose than antraxit nung, graphite petroleum coke, or other options, this guide is for you.
What is a Recarburizer and Why is it Important?
Every metallurgist knows carbon content matters—but how you restore it makes all the difference. A poor recarburizer means inconsistent chemistry and higher slag formation.
A recarburizer is a carbon-rich material added to molten metal (especially in steelmaking and foundry applications) to restore or increase carbon content lost during melting.
The Science Behind Carbon Additives
Recarburizers must meet strict specs to perform well:
| Property | Ideal Range |
|---|---|
| Fixed Carbon (FC) | 90%–98.5% |
| Sulfur (S) | < 0.25% (ideally < 0.05%) |
| Volatile Matter | < 1% |
| Độ ẩm | < 0.5% |
Using a low-quality carbon source often leads to excessive slag and poor melt quality. I’ve seen clients switch to high-grade graphite petroleum coke and report 10–15% higher carbon recovery almost immediately.
What Types of Recarburizers Are Commonly Used?
Confused by too many carbon sources? You’re not alone—there are multiple types, and each fits different needs and budgets.
The most common types include:
- Than antraxit nung – Best for cost-effective bulk carbon raising. See details here.
- Graphite Petroleum Coke (GPC) – Premium carbon raiser with high purity.
- Calcined Petroleum Coke (CPC) – Good balance between purity and price. Learn more here.
- Artificial Graphite – Highly pure but expensive. Often used in ductile iron casting.
- Natural Graphite – Economical, but inconsistent quality.
Comparison Table
| Type | FC | Sulfur | Cost | Application |
|---|---|---|---|---|
| Calcined Anthracite | 90–95% | ≤0.25% | Low | Steel, Foundry |
| GPC | 98.5% | ≤0.05% | High | High-end steel |
| CPC | 98% | ≤0.5% | Medium | General steel |
| Artificial Graphite | 99% | ≤0.03% | Very High | Precision casting |
How to Match Recarburizer Type with Your Furnace?
Are you using an EAF, induction furnace, or cupola? Your furnace type directly impacts which recarburizer is best.
For example:
- Induction Furnaces – Need fast absorption and low sulfur. GPC is ideal.
- Cupola Furnaces – Cost-sensitive operations often prefer than antraxit nung.
- Electric Arc Furnaces (EAF) – Use a mix of high-efficiency GPC and CPC.
Choosing the wrong type can result in poor solubility or excessive slag buildup.
What Factors Affect Recarburizer Efficiency?
Even the best product won’t perform well if applied incorrectly. Key factors include:
- Particle Size: Too fine and it burns off; too large and it won’t melt.
- Addition Timing: Early-stage additions absorb better.
- Pouring Temperature: Lower temperatures reduce absorption.
- Moisture & Impurities: Even small amounts lower efficiency drastically.
One Southeast Asian client switched to 1–5mm GPC with sulfur <0.05% and saw a 12% jump in carbon recovery compared to their previous coke blend.
How to Choose Based on Your Product Requirements?
Different final products require different carbon specs. Here’s a simple guide:
| Product | Recommended Recarburizer | Why |
|---|---|---|
| Carbon Steel | GPC / CPC | High purity needed |
| Ductile Iron | Artificial Graphite | Low nitrogen & sulfur |
| Gray Iron | Calcined Anthracite | Cost-effective & reliable |
| Alloy Steel | GPC | Purity + conductivity |
Still unsure? Our technical team can advise based on your spec sheet and furnace setup.
Phần kết luận
Choosing the right recarburizer means better melt quality, lower costs, and higher carbon recovery. It’s a small change with a big impact on steelmaking.
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