Mold Powder (Continuous Casting Mold Flux)
2026-04-09
Mold Powder (Continuous Casting Mold Flux)
Main Functions
- Prevent secondary oxidation of molten steel: Forms a liquid slag layer on the molten steel surface to isolate air.
- Thermal insulation: Reduces heat loss of molten steel through the powder slag layer.
- Absorb and dissolve non-metallic inclusions: Purifies molten steel and improves slab cleanliness.
- Lubrication: Forms a liquid slag film between the copper wall of the mold and the solidified shell to reduce friction and prevent sticking.
- Fill air gaps and improve uniform heat transfer: Reduces local supercooling or overheating caused by air gaps and lowers the risk of cracks.
Typical Chemical Composition (by mass percentage)
- CaO: 25–44% — Improves basicity and inclusion adsorption capacity; excessive content tends to cause crystallization.
- SiO₂: 30–44% — Controls melting point and viscosity.
- Al₂O₃: 2–8% — Lowers solidification point; content exceeding 10% deteriorates lubrication.
- MgO: 6–10% — Reduces viscosity and improves fluidity.
- Na₂O: 3–10% — Lowers melting point but tends to precipitate high-melting-point minerals.
- CaF₂: 5–10% — Acts as a flux; excessive amount erodes the submerged entry nozzle.
Structural Requirements
- Powder slag layer (upper layer, <500℃): Remains unmelted and provides thermal insulation.
- Sintered layer (middle layer, 600–900℃): Partially melted.
- Liquid slag layer (lower layer, approx. 10–15 mm thick): Provides lubrication and heat transfer.
Performance Parameters
- Melting point: 900–1200℃
- Viscosity: 0.1–1.0 Pa·s (inversely proportional to casting speed)
保护渣是连铸生产中用于钢液表面的关键冶金辅助材料，主要作用包括保温、防氧化、吸收夹杂物、润滑和改善传热。以下是其核心要点：
主要作用 防止钢液二次氧化：在钢液表面形成液渣层，隔绝空气。 绝热保温：通过粉渣层减少钢水热量损失。 吸收并溶解非金属夹杂物：净化钢液，提升铸坯纯净度。
润滑作用：在结晶器铜壁与凝固坯壳间形成液渣膜，减少摩擦，防止粘结。
充填气隙，改善传热均匀性：减少因气隙导致的局部过冷或过热，降低裂纹风险。
典型化学成分（按质量百分比）
CaO：25–44% — 提高碱度，增强夹杂物吸附能力，但过高易析晶。
SiO₂：30–44% — 控制熔点与粘度。
Al₂O₃：2–8% — 降低凝固点，但含量过高（>10%）会恶化润滑。
MgO：6–10% — 降低粘度，提高流动性。
Na₂O：3–10% — 降低熔点，但易析出高熔点矿物。
CaF₂：5–10% — 助熔剂，但过量侵蚀水口。
结构要求 理想状态下在结晶器内形成三层结构： 1. 粉渣层（上层，<500℃）：保持未熔，起保温作用。 2. 烧结层（中间，600–900℃）：部分熔融。 3. 液渣层（下层，约10–15mm厚）：提供润滑与传热
性能参数 熔点：900–1200℃
粘度：0.1–1.0 Pa·s（与拉速成反比）
Real-time Information
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2026-04-09
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HENAN SINO INDUSTRIAL REFRACTORY NEW MATERIAL CO. LTD
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Mazhai, Zhengzhou, China
Nanlou, Dashiqiao, China
Xinmi, Zhengzhou, China
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