Steel industry
Introduction:
The steel production process involves extremely harsh conditions in core equipment such as blast furnaces, converters, electric arc furnaces, ladles, continuous casting systems, and reheating furnaces. These include ultra-high temperatures (up to 1700°C), strong alkaline slag erosion, iron oxide penetration, mechanical abrasion, and thermal shock. Zhengzhou Jinshan Refractory Materials provides professional and high-performance refractory solutions tailored to different steelmaking processes, focusing on magnesia-carbon bricks, magnesia-spinel bricks, high-alumina materials, and advanced unshaped refractories to help customers significantly extend equipment service life, reduce refractory consumption per ton of steel, improve molten steel purity, and increase production efficiency.
1. Blast Furnace
Working Conditions:
The blast furnace is the foundation of ironmaking. Temperatures increase from top to bottom, reaching over 1600°C in the hearth and bosh. These areas suffer intense erosion and chemical attack from molten iron and slag. The shaft faces alkali metal attack and CO reduction atmosphere, along with mechanical abrasion from descending burden.
Recommended Refractory Materials and Advantages:
- High-purity silicon carbide bricks / Nitride-bonded silicon carbide bricks: Excellent resistance to molten iron erosion, oxidation, and good thermal conductivity — ideal for hearth and bosh areas.
- High-alumina bricks (Al₂O₃ 70-80%) and phosphate-bonded high-alumina bricks: Used in the middle and upper shaft with strong alkali resistance and volume stability.
- Lightweight insulating castables + ceramic fiber layers: For shell insulation to reduce heat loss and improve energy efficiency.
2. Converter / EAF (Basic Oxygen Furnace / Electric Arc Furnace)
Working Conditions:
Converters and EAFs experience severe thermal shock, strong oxidizing slag erosion, and mechanical impact. The slag line area suffers the most intense erosion due to extreme temperature fluctuations (1400–1700°C).
Recommended Refractory Materials and Advantages:
- Magnesia-Carbon Bricks: With 10-20% carbon content, offering superior slag resistance and thermal shock resistance — the mainstream choice for slag lines and furnace walls.
- Magnesia-spinel bricks: Excellent thermal shock and erosion resistance for high-stress zones.
- Magnesia-carbon ramming mixes and plastics: For furnace bottoms and quick repairs with good integrity.
3. Ladle / Refining Furnace
Working Conditions:
Ladles hold molten steel (1550–1650°C) for extended periods while facing strong slag erosion, steel penetration, and repeated thermal cycling during preheating and teeming.
Recommended Refractory Materials and Advantages:
- Magnesia-spinel bricks or high-purity magnesia bricks: Superior slag resistance and low penetration, reducing steel contamination.
- High-alumina castables (low-cement or cement-free): Monolithic lining with excellent integrity and long service life.
- Lightweight insulating castables: For permanent layers to maintain steel temperature and reduce heat loss.
4. Continuous Casting System
Working Conditions:
Tundishes, ladle shrouds, submerged entry nozzles, and monoblock stoppers face continuous contact with molten steel, alumina inclusions, and thermal cycling.
Recommended Refractory Materials and Advantages:
- Alumina-carbon / Alumina-zirconia-carbon submerged entry nozzles: Strong resistance to steel erosion and clogging.
- Magnesia or spinel-based tundish working linings: Environmentally friendly with excellent steel cleanliness.
- High-alumina or zirconia precast blocks: For high-wear areas with superior abrasion resistance.
5. Reheating Furnace / Annealing Furnace
Working Conditions:
Reheating furnaces operate at 1200–1350°C in oxidizing atmospheres with scale abrasion and frequent thermal cycling. Furnace bottoms, walls, and roofs are prone to oxidation and wear.
Recommended Refractory Materials and Advantages:
- High-alumina bricks and low-creep high-alumina bricks: Good oxidation resistance and volume stability for walls and roofs.
- Abrasion-resistant high-alumina or silicon carbide castables: For bottoms and skids with strong resistance to iron oxide scale.
- Ceramic fiber modules: Lightweight, fast installation, and excellent insulation for energy savings.
Why Choose Jinshan Refractories?
- Rich experience and technical expertise in steel industry projects
- Strict quality control and advanced testing equipment
- Customized solutions based on furnace type, steel grade, and operating conditions
- Professional technical support, installation guidance, and comprehensive after-sales service
Call to Action (CTA):
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Contact Us
whatsapp:+8615936268068
Phone:+86-15936268068
Email:zzjsrefractory@gmail.com
Address: Chengguan Industrial Zone, Xinmi City, Henan Province
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