High-alumina brick LZ-55 (Al₂O₃≥55%) with refractoriness ≥1770℃ offers dense structure, wear resistance against gas scouring and combined cold/hot strength—one of the most widely used shaped refractories.
| Al₂O₃ Content | ≥55% |
|---|---|
| Refractoriness | ≥1770℃ |
| Bulk Density | ≥2.30 g/cm³ |
| CCS | ≥60 MPa |
| RUL (0.2MPa) | ≥1470℃ |
| Apparent Porosity | ≤22% |
High-alumina brick LZ-55 is made from bauxite chamotte with Al₂O₃ ≥55%, refractoriness ≥1770℃ and bulk density ≥2.30 g/cm³. Dense structure with both cold and hot strength, strong versatility, standardized laying or special shapes per drawing. It is Henan Songrui's base high-alumina grade for blast furnaces, hot blast stoves, EAF roofs and other industrial kilns.
LZ-55 suits routine zones at 1400-1600℃; choose LZ-65+ for hotter, more corrosive zones; fireclay is more economical at low temperature. Zoned LZ-55/LZ-65 selection suits BFs and hot blast stoves.
Lay with high-alumina mortar, joints 1-2mm; match shapes and reserve expansion joints for arches and hot load-bearing zones. Design and selection advice available.
Henan Songrui New Refractory Materials Co., Ltd. (Xuanhua Town Industrial Park, Henan) is a 2024 Class A taxpayer and SRDI SME. For selection, quotation or installation, contact Manager Zheng (17513376789 / 17513376789@163.com).
High-alumina brick LZ-55 (Al₂O₃≥55%) is among the most widely used shaped refractories:
LZ-55 has Al₂O₃ ≥55% with service up to about 1450℃, widely used in BFs, hot blast stoves and reheating furnaces.
Choose LZ-65 (Al₂O₃≥65%) for higher temperature and stronger slag attack; LZ-55 is more economical for general medium-high service.
BF bosh, belly and lower stack, plus hot blast stoves and mixers—not for strong slag lines.
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