EL 1699 DO
A 99% silicon carbide deoxidizer for the most stringent molten-steel purity demands.
EL-1699-DO is a 99% silicon carbide (SiC ≥ 99%) deoxidizer — the highest grade in the FerrumX family. With impurities driven to the industry’s lower limits, it is built for ultra-pure and aerospace steels.
What it is
What EL 1699 DO Is & Where It Is Used
EL 1699 DO is a 99% silicon carbide deoxidizer with SiC content no less than 99%, produced from high-purity quartz sand and petroleum coke through precision smelting and multiple purification steps. Impurity levels are reduced to the practical minimum.
It is specified for smelting with the strictest molten-steel purity demands — high-end special steels, ultra-pure steels, and aerospace steels, including bearing, gear, spring, automotive sheet, electrical, and aerospace structural steels.
Deoxidation Mechanism
Deoxidation Mechanism
EL 1699 DO uses the same deoxidation chemistry, but its near-absolute purity changes the outcome:
SiC + 3[O] → SiO₂ + CO↑. Higher purity means SiC decomposes and reacts more rapidly and thoroughly, and the risk of contaminating the bath with Fe, S, or free carbon is near zero.
Deoxidation products (SiO₂, CO) form more stably and controllably, supporting an ideal reducing slag. Combined with carbon powder for pre-deoxidation, final oxygen can be held consistently below 50 ppm — meeting the extreme purity bar of high-end special steels.
Key Advantages
Key Advantages
EL 1699 DO pursues ‘purity equals performance’:
Industry-leading low impurities
Fe₂O₃ ≤ 0.1–0.3%, free carbon ≤ 0.3%, S ≤ 0.01% — no secondary contamination.
~40% higher deoxidation efficiency
Versus traditional aluminum deoxidizers, shortening smelt time.
Ultra-clean steel
Final oxygen consistently below 50 ppm for high-end special steels.
Higher alloy recovery
Manganese recovery rises from ~82% to over 90%, with stable chromium recovery.
Lower environmental load
Dust −30%, slag volume −15%, electricity −5–8% versus traditional practice.
Technical Specifications
Technical & Physical Specifications
Typical specifications for EL 1699 DO. Third-party inspection (SGS/BV/CCIC) is acceptable on request.
| Parameter | Typical value | Notes |
|---|---|---|
| SiC Content | ≥ 99.0% | Typical range 98.5%–99.5% |
| Free Carbon (F.C.) | ≤ 0.1%–0.3% | Industry-leading impurity control |
| Fe₂O₃ Content | ≤ 0.1%–0.3% | Ensures ultra-clean steel |
| SiO₂ Content | ≤ 1.0% | — |
| Al₂O₃ Content | ≤ 0.5% | — |
| S Content | ≤ 0.01%–0.05% | Ultra-low sulfur control |
| H₂O Content | ≤ 0.3% | — |
| Specific Gravity | 3.20–3.25 g/cm³ | — |
| Particle Size | 0–1 / 1–3 / 3–5 / 1–10 mm, 200 mesh (customizable) | — |
| Appearance | Black granules or briquettes | — |
Usage
Application & Addition
For in-furnace addition use 1–5 mm particles at 0.8–1.2% addition; for ladle pre-treatment use 0.2–1 mm particles at 0.1–0.3% addition. Adjust to furnace condition, target composition, and casting requirement.
In LF refining, 99% SiC rapidly produces white slag, lowers slag melting point, and promotes slag–steel separation without adding inclusions. It is also used as a high-end casting inoculant (wind-turbine components, turbochargers, high-grade machine-tool castings) to refine grain and improve machinability.
Deoxidation Mechanism and Technical Advantages
Deoxidation Reaction Mechanism
Silicon carbide deoxidizer is a composite deoxidizer primarily composed of silicon carbide (SiC). It reacts with free oxygen in molten steel to produce SiO₂ and CO gas, promoting the diffusion of oxygen from the steel into the slag, thereby reducing the oxygen content in the molten steel and delaying the decline in inoculation effectiveness of the molten iron.
The deoxidation reaction principle for 99% grade silicon carbide is consistent with that of other grades, but higher purity means:
The silicon carbide deoxidation reaction is exothermic, so deoxidation also serves to raise the temperature of the molten steel.
Technical Advantages (Unique to the 99% Grade)
The fundamental difference between 99% silicon carbide and other grades lies in the ultimate pursuit of “purity equals performance”:
Industry-leading low impurity levels
Fe₂O₃ ≤ 0.1%, free carbon ≤ 0.1%, S ≤ 0.01%—ensuring that no impurity elements cause secondary contamination of the molten steel
Industry-leading deoxidation efficiency
The deoxidation efficiency is approximately 40% higher than that of traditional aluminum deoxidizers, significantly shortening smelting time
Unparalleled molten steel purity
Final oxygen content in molten steel can be consistently controlled below 50 ppm, meeting the extreme purity requirements of high-end special steels
Optimal alloy recovery rate
Recovery rates for valuable alloying elements such as manganese and chromium have increased from approximately 82% in traditional processes to over 90%
Optimal alloy recovery rate
Combines highly efficient deoxidation with carbon addition, achieving a carbon absorption rate significantly higher than that of traditional carbon-adding agents
Leading in environmental protection and resource conservation
Reduces dust emissions by 30%, decreases slag volume by 15%, and lowers electricity consumption by 5%–8%
Applications
Applications
Ultra-high-purity & high-end special steels
Bearing, gear, spring, automotive sheet, electrical, and aerospace structural steels where oxygen is held at ≤ 10–15 ppm.
Taphole clay for ultra-large blast furnaces
Premium raw material in anhydrous gunning mix for furnaces ≥ 4000 m³; higher purity means lower impurity introduction and better slag-erosion resistance.
Slag modification & refining
In LF furnaces, rapidly forms white slag and protects ladle lining without adding inclusions.
High-end casting inoculation
Inoculant for wind-turbine and turbocharger castings to promote graphitization and refine grain.
FAQ
EL 1699 DO — Frequently Asked Questions
A 99% SiC deoxidizer for the strictest molten-steel purity demands — ultra-pure, bearing, gear, spring, electrical, and aerospace steels.
SiC ≥ 99%, with Fe₂O₃ ≤ 0.1–0.3%, free carbon ≤ 0.3%, and S ≤ 0.01% — among the highest-purity industrial SiC available.
With carbon-powder pre-deoxidation, final oxygen is held consistently below 50 ppm, meeting extreme-purity requirements.
0.8–1.2% in-furnace (1–5 mm) and 0.1–0.3% ladle pre-treatment (0.2–1 mm); tune to furnace and target.
Yes. Manganese recovery rises from ~82% to over 90%, with stable chromium recovery, lowering overall cost per ton.
SGS, BV, and CCIC inspection are acceptable on request.
