Product Overview
Graphitized carburizer is a high-purity carbon material made from petroleum coke or pitch coke through high-temperature graphitization treatment (2500-3000°C). Compared to ordinary carburizers, its carbon atoms are arranged in a regular layered structure, offering higher stability and absorption rates, making it an ideal choice for premium casting and special steel smelting.
Key Characteristics
|
Parameter |
Specification |
Advantage |
|
Fixed Carbon (FC) |
≥98-99.5% |
Ultra-high purity, minimal impurities |
|
Sulfur Content (S) |
≤0.03-0.05% |
Extremely low sulfur, prevents steel embrittlement |
|
Nitrogen Content (N) |
≤0.01% |
Reduces porosity defects |
|
Ash Content |
≤0.1-0.3% |
Nearly residue-free, improves metal purity |
|
Absorption Rate |
90-95% |
Fast dissolution (3-5 minutes) |
|
Graphitization Degree |
≥90% |
Crystal structure close to natural graphite |
Manufacturing Process
Raw Material Purification: Selected low-sulfur petroleum coke (S≤0.5%).
High-Temperature Graphitization:
Treated above 2500°C in an inert atmosphere to transform amorphous carbon into a regular graphite structure.
Crushing & Classification:
Laser particle size control (typical range: 0.2-5mm).
Product Forms
High-Density Granules (1-5mm):
Suitable for electric furnace smelting.
Micro-Powder (≤0.1mm):
Used in special alloy powder metallurgy.
Cored Wire:
Precise wire feeding for continuous casting.
Application Fields
1. Premium Casting
Ductile Iron:
Improves nodularization rate (≥90%), reduces shrinkage defects.
Typical dosage: 0.8-1.5%.
High-Grade Gray Iron (HT250+):
Stabilizes Type A graphite formation, enhances tensile strength.
2. Special Steel Smelting
|
Steel Type |
Function |
Process Key Points |
|
Bearing Steel |
Controls carbon segregation |
Added in vacuum furnaces, carbon fluctuation ≤0.02%. |
|
Tool Steel |
Replaces partial graphite electrodes |
Reduces production costs by 15-20%. |
|
Stainless Steel |
Fine-tunes carbon content during refining |
Used with low-carbon ferrochrome. |
3. New Energy Materials
Lithium Battery Anodes: Used as a graphitized carbon source.
Photovoltaic Monocrystalline Silicon: Raw material for carbon-carbon composites in thermal fields.
4. Competitive Advantages
|
Application |
Graphitized Carburizer |
Ordinary Carburizer |
|
High-End Auto Castings |
Surface roughness Ra≤3.2μm |
Ra≥6.3μm |
|
Wind Turbine Spindles |
Low-temperature impact energy ≥27J |
≤15J |
|
Mold Steel Hydrogen Cracking Rate |
≤0.01% |
≥0.1% |
Usage Recommendations
Electric Furnace Process:
Add 5 minutes before tapping to avoid excessive oxidation.
Pre-Treatment:
Combined use with Si-Ba inoculants can improve absorption by 5-8%.
Cost-Effective Solution:
Mix 1:1 with coal-based carburizer to balance cost and performance.
This product is SGS-certified and complies with ASTM A144-19 standards, making it particularly suitable for high-end industries with strict carbon control requirements, such as aerospace and nuclear power.