I. Physicochemical Indicators of Anthracite Carburizers

Anthracite carburizers are carbon materials processed from high-grade anthracite, with the following key physicochemical indicators:

Parameter	Typical Range	High-End Requirements	Testing Standard
Fixed Carbon	≥90%~98%	≥95%	GB/T 212-2008
Ash Content	≤5%~8%	≤3%	GB/T 1574-2007
Volatile Matter	≤5%	≤3%	GB/T 212-2008
Sulfur Content	≤0.5%~1.0%	≤0.3%	GB/T 214-2007
Moisture	≤1%~3%	≤0.5%	GB/T 211-2017
Particle Size	1~10mm (customizable)	0.5~5mm (for precision casting)	GB/T 17608-2006
Resistivity	800~1200 μΩ·m	≤800 μΩ·m	YB/T 120-2019
True Density	1.6~1.8 g/cm³	≥1.75 g/cm³	GB/T 6155-2008

II. Main Application Fields

1,Foundry Industry (Core Application)

Purpose: Used as a carburizer in cast iron (gray/ductile iron) melting to compensate for carbon loss in molten iron.

Advantages: Lower cost compared to petroleum coke/graphite carburizers, offering high cost-effectiveness.

Low sulfur content (≤0.5%), reducing gas porosity defects in castings.

2,Steel Metallurgy

Electric Arc Furnace Steelmaking: Used as an auxiliary material to adjust carbon content in molten steel (requires low-ash products, ash ≤3%).

Secondary Refining: Used in LF furnaces for fine-tuning carbon composition.

3,Ferroalloy Production

Replaces part of coke in silicon/manganese alloy smelting, reducing production costs.

4,Other Fields

Silicon Carbide Manufacturing: Acts as a carbon source in the reduction reaction of SiO₂.

Chemical Reducing Agent: Used in yellow phosphorus and calcium carbide production.

III. Analysis of Practical Effects

Application Scenario	Performance	Precautions
Cast Iron Melting	- Carbon absorption rate: 85%~92% (lower than graphite carburizers' ≥95%) - Slower carburization speed; requires early addition	Crush to 3~5mm to avoid floating on molten iron surface
EAF Steelmaking	- Suitable for low-carbon steel grades (low sulfur sensitivity) - More economical than electrode scraps	High ash content may increase slag formation
Ductile Iron Production	- Requires low-sulfur anthracite (S≤0.3%) - Avoids interference with nodularization	Prioritize products with fixed carbon ≥95%
Casting Quality	- Reduces shrinkage tendency (stable carbon equivalent) - Slightly inferior surface finish compared to graphite carburizers	Strictly control impurity content (e.g., Al₂O₃≤0.5%)

IV. Comparison with Petroleum Coke/Graphite Carburizers

Property	Anthracite Carburizer	Petroleum Coke Carburizer	Graphite Carburizer
Carbon Absorption	85%~92%	90%~95%	95%~98%
Sulfur Content	0.3%~1.0%	0.5%~2.0%	≤0.3%
Cost	Low (~¥3000–4000/ton)	Medium (¥5000–6000/ton)	High (¥8000–12000/ton)
Applications	General cast iron, steel carbon adjustment	High-end cast iron, specialty steels	Ductile iron, precision casting

V. Usage Recommendations

Prioritize Low-Ash/Low-Sulfur Products: Ash ≤3% and sulfur ≤0.3% meet the requirements for ductile iron and steel carburization.

Match Particle Size to Process:

Medium-frequency furnaces: 3~8mm (prevents floating).

Cupola furnaces: 5~10mm (extends residence time).

Optimize Addition Method:

Add in batches with furnace charge to avoid uneven absorption.

Combine with electromagnetic stirring to improve carbon diffusion efficiency.

Note: Actual performance depends on melting temperature (recommended 1500–1550°C), molten iron composition (Si content affects carbon activity), and other factors. Adjust ratios based on production conditions.

Hot Tags: anthracite carburizers, China anthracite carburizers manufacturers, suppliers, carbon additive, Gas Calcined Anthracite, graphite electrodes fine, Graphite Electrodes Powder, graphite electrodes powder with low Sulful low Nitrogen, graphite fine