Low-cement high-alumina castable with CaO≤2.5% and Al₂O₃≥65% reaches 1650℃ service. Dense micro-powder grading lowers porosity and raises hot strength.
| Max. Service Temp. | 1650℃ |
|---|---|
| Al₂O₃ Content | ≥65% |
| CaO Content | ≤2.5% |
| Bulk Density | 2.60 g/cm³ |
| CCS (110℃×24h) | ≥70 MPa |
Low-Cement High-Alumina Castable uses bauxite or corundum aggregate with CaO below 2.5%. The sharply reduced cement content, combined with fine powder and dispersants, achieves dense packing that improves cold/hot strength, high-temperature volume stability and slag resistance versus ordinary castables. It is a key grade of Henan Songrui for critical linings up to 1650℃ where slag attack and gas-flow erosion coexist.
This grade sits between ordinary high-alumina and ultra-low-cement castables in cost and performance. For mild service up to 1600℃ use LA-60; for slag-exposed life-critical linings (casthouses, ladle permanent layers) choose this product; for near-corundum performance upgrade to ultra-low-cement.
Water is critical: keep to the datasheet (typically 5-7%). Force-mix, vibrate fully, cure and heat up per the low-cement schedule to avoid explosive spalling.
Henan Songrui New Refractory Materials Co., Ltd. (Xuanhua Town Industrial Park, Henan) is a 2024 Class A taxpayer and SRDI SME with a full production line and testing laboratory. For selection, quotation or installation guidance, contact Manager Zheng (17513376789 / 17513376789@163.com).
Low-cement high-alumina castable achieves denser hot structure with reduced CaO, for demanding metallurgical and power applications:
Low-cement grade has CaO below 2.5% with fine-particle packing for denser structure, lower porosity, higher hot strength and better slag resistance for troughs and ladles.
Used for BF casthouse troughs, ladle permanent layers and walls, mixer linings, CFB cyclones and reheating furnace hot hearths.
Water is critical: keep to the datasheet (typically 5-7%). Excess water significantly reduces strength and slag resistance.
Maximum service temperature about 1650℃, recommended long-term up to 1600℃ with stable volume.
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