— Beifang Alloy provides an in-depth analysis of the practical value of Si-Al-Ca deoxidizer
In continuous casting production, nozzle clogging is a persistent challenge for metallurgists. The buildup at the submerged entry nozzle primarily consists of high-melting-point calcium aluminates such as CaO·6Al₂O₃, CaO·2Al₂O₃, and CaO·Al₂O₃, along with alumina-based oxides. The root cause of nozzle clogging is the continuous accumulation and adhesion of high-melting-point inclusions on the inner wall of the nozzle, ultimately leading to casting interruption or even breakouts.
The core of the problem lies in Al₂O₃ — this deoxidation product has a melting point as high as 2050℃ and remains solid at casting temperatures. When large amounts of solid Al₂O₃ inclusions flow through the nozzle with the molten steel, they behave like sediment depositing at a pipe bend, eventually blocking the passage entirely.
So, can Si-Al-Ca deoxidizer fundamentally solve this problem? The answer is YES.
The core value of Si-Al-Ca deoxidizer lies in the modification effect of calcium on inclusions. The technical logic is crystal clear:
By introducing calcium into the molten steel, the high-melting-point brittle Al₂O₃ inclusions (melting point 2050℃) are converted into low-melting-point liquid calcium aluminates, with 12CaO·7Al₂O₃ being the most desirable form.
Industry-recognized key indicators:
When Ca/Al > 0.14 in the steel, nozzle clogging can be effectively reduced
The target product 12CaO·7Al₂O₃ remains liquid at steelmaking temperatures and readily floats up for removal from the molten steel
The “ternary synergy” mechanism of Si-Al-Ca:
| Element | Core Function | Effect |
|---|---|---|
| Aluminum (Al) | Primary strong deoxidizer | Rapidly combines with free oxygen, reducing oxygen content |
| Silicon (Si) | Reduces molten steel viscosity | Improves steel fluidity, promotes inclusion flotation |
| Calcium (Ca) | Inclusion modification | Converts Al₂O₃ to low-melting-point liquid calcium aluminate, fundamentally eliminating nozzle clogging |
Research data shows that using high-quality composite deoxidizer can reduce total oxygen content in steel to below 15ppm, with inclusion rating improved by 1-2 grades. In actual applications for SPHC steel grade with continuous casting direct feeding, the deoxidation efficiency of Al-Mn-Ca deoxidizer reached 55%–65%, with zero breakout during continuous casting, a cost reduction of 50–60 RMB/ton, and calcium yield reaching 30%–40% (compared to only 10%–20% for traditional calcium wire feeding).
Based on industry standards, the following indicators should be prioritized in procurement:
| Dimension | Key Indicator | Quality Standard |
|---|---|---|
| Chemical Composition | Si+Al+Ca total content | ≥65%, deviation ≤1.5% |
| Particle Size Control | 10-50mm or 1-3mm | Sieve retention rate ≥95% |
| Moisture Content | H₂O | ≤0.5% |
| Melting Point Range | — | 1200-1350℃ |
Pain Point 1: Composition fluctuation → Frequent adjustments to smelting operations, affecting production stability
Pain Point 2: Inconsistent particle size → Excessive fines cause dust loss and reduced yield
Pain Point 3: Product-only sales with no technical support → Products don’t match on-site processes, effectiveness compromised
A quality supplier should be more than just a “seller” — they should be a “problem-solving partner.”
Anyang City, Henan Province, leveraging its rich raw material resources and industrial cluster advantages, has formed a nationally leading deoxidizer production base. Below is a comparison of different supplier types:
| Comparison Dimension | Beifang Alloy (Our Company) |
Henan Xinchuang Metal | Anyang Jinyuan Metallurgy | Gongyi Hengtai Metallurgy |
|---|---|---|---|---|
| Year Established | Years of deep industry experience | 2001 (restructured 2023) | 2005 | 2012 |
| Core Advantage | Self-owned ferroalloy production base, full-chain quality control | Serves 300+ steel enterprises, zero major quality incidents | “Low-silicon high-calcium” formula, annual capacity 50,000 tons | Two national patents, ultra-low silicon Si-Al-Ca |
| Specialty | Full range of converter/EAF deoxidation auxiliary materials | Customized metallurgical powders and alloy auxiliaries | Low-carbon steel, EAF short-process | High-grade silicon steel, precision alloys |
| Customization Capability | ✅ Customizable by steel grade and furnace type | ✅ Customizable per client requirements | ✅ On-site technical guidance available | ✅ Custom packaging for automated feeding systems |
| Service System | Pre-sales consultation + on-site follow-up + after-sales service | “One-factory-one-plan” deoxidation optimization | Technical team led by retired Anyang Steel engineers | Can simulate steel deoxidation process for optimization proposals |
| Third-Party Testing | ✅ Batch test reports available | ✅ Batch retention tracing + SGS testing | — | — |
When choosing a supplier, don’t just look at price — evaluate three key factors:
Composition stability — Require factory test reports for each batch, with special attention to Si, Al, and Ca content deviations
Technical support capability — Can they provide customized solutions based on your steel grade and furnace type?
Supply assurance — What is their emergency supply capability? Can they avoid supply disruptions affecting your production schedule?
Adjust based on converter endpoint carbon content:
Endpoint carbon ≥ 0.04%: Add 1.6–2.2 kg per ton of steel
Endpoint carbon < 0.04%: Add 2.7–3.1 kg per ton of steel
Based on industry experience, the split charging method is recommended: place part of the deoxidizer at the bottom of the ladle before tapping, and add the remainder in stages during tapping to ensure thorough reaction.
After entering the argon station, stir with high gas flow for 2–4 minutes to allow deoxidation products to fully float up
Soft blow for 10–16 minutes to promote inclusion aggregation and removal
Moisture-proof packaging (inner plastic bag + outer woven bag) is mandatory, with storage environment humidity ≤60%. If caking occurs, dry at 110℃ before use — otherwise, it may cause hydrogen increase in the molten steel.
As a professional ferroalloy manufacturer, we deeply understand steel mills’ dual needs for stable quality and technical support.
Our Commitments:
✅ Direct Manufacturing: Self-owned ferroalloy production base, full-chain control from raw materials to finished products
✅ Stable Composition: Batch deviation ≤1.5%, with test reports available for each batch
✅ Precise Particle Size: Customized to your feeding process specifications
✅ Technical Support: Deoxidation solution optimization based on your steel grade and furnace type
✅ Reliable Supply: Leveraging Anyang’s industrial cluster advantages for timely delivery
We don’t just sell Si-Al-Ca — we help you solve the “nozzle clogging” problem.
Back to the opening question: Continuous casting nozzle frequently clogged? Can Si-Al-Ca deoxidizer transform Al₂O₃ inclusions into liquid state for removal?
The answer is YES. Si-Al-Ca deoxidizer, through calcium modification of Al₂O₃ inclusions, converts high-melting-point solid alumina into low-melting-point liquid calcium aluminate that readily floats up for removal, fundamentally eliminating the nozzle clogging issue.
The key lies in choosing the right supplier and the right process solution.
If you’re struggling with nozzle clogging issues, feel free to contact us. We’ll be happy to provide professional technical support and product solutions.
Beifang Alloy
📧 Email: info@hnxyie.com
🌐 Website: www.beifangalloy.com
