Knowledge base on brick selection, masonry and curing
The real selection criterion in the firing zone is not the brick datasheet but whether a stable coating forms. This note compares composition and property ranges for both brick types, coating formation differences and start-up practice, masonry and heat-up control values, and a three-question decision table.
Read More →AZS-33, 36 and 41 differ in ZrO2 content and glass-phase exudation temperature, not in grade. This note covers composition and bulk density ranges, where the shrinkage cavity sits in normal versus void-free casting, joint control for sidewalls and bottoms, and why the 600–900℃ range of the heat-up curve must be slowed down.
Read More →Locate the failure mode first, then pick the grade. Properties and application limits for alumina-carbon versus alumina-zirconia-carbon with 8–15% ZrO2; bore sizing from 25 to 55 mm against ladle capacity and casting speed; 4–6 versus 8–12 heats per campaign; where the 0.03 mm flatness and 0.05 mm parallelism limits come from; why preheat and no-preheat routes must not be mixed; and the three incoming checks.
Read More →With more than 600 °C across the checkerwork, brick selection has to be zonal: magnesia (MgO ≥90%) at 1350–1550 °C, LZ-65 or mullite in the middle, low-porosity fireclay (≤15%) at 700–1100 °C. Includes the 40/30 mm thickness versus 38–58 m²/m³ surface-area calculation, joint and expansion-gap values, and four measurable rejection signals.
Read More →The transition zone runs at 1000–1300°C with cycling, alkali concentration and unstable coating. Silica-mullite and anti-spalling high-alumina brick divide the work rather than compete. Includes property ranges, 2–3 mm joints and keying values, plus in-service thresholds at 380°C shell temperature and one-third residual thickness.
Read More →Coke oven chambers run near 1300°C under pushing loads for a decade. True density ≤2.34 g/cm³, SiO₂ ≥94.5% and residual expansion of 0.2–0.5% decide campaign life — and the expansion joint decides whether the masonry survives heat-up.
Read More →What Refractory Brick for Aluminium Melting Furnaces? How to Choose High Alumina Brick
Read More →What Brick for the Steel Ladle Slag Line? How to Choose Magnesia-Carbon Brick
Read More →Hot metal ladle (torpedo car) linings face molten iron erosion, slag attack and severe thermal shock — ordinary high-alumina and fireclay bricks fail quickly. Al2O3-SiC-C bricks, combining slag resistance, thermal shock resistance and abrasion resistance, have become the mainstream choice. This guide covers selection criteria, key properties and supplier evaluation to extend ladle life and cut refractory cost per ton of iron.
Read More →High-alumina brick (Al₂O₃≥48%) offers higher temperature, strength and slag resistance; fireclay brick (Al₂O₃ 30-48%) is economical with good thermal-shock resistance. This article compares performance and applications with selection advice.
Read More →Magnesia-carbon brick uses carbon for slag non-wetting and thermal-shock resistance—the mainstay for converters and ladle slag lines; magnesia-alumina spinel brick is chrome-free and clinker-resistant—the recommended choice for cement burning zones. This article compares their application boundaries.
Read More →Henan Songrui New Refractory Co., Ltd. details the full-process blast furnace lining refractory selection solution: from micro-porous corundum bricks at the hearth to alkali-resistant high-alumina bricks at the throat, precise zone-specific material selection for 10+ year long-life furnaces. Annual capacity 800,000 tons, full furnace refractory customization supported, 7-day fast delivery.
Read More →高铝砖按 Al₂O₃ 含量分为 LZ-48/55/65 等牌号，不同牌号的使用温度和适用工况不同。本文说明各牌号的关键指标差异、按工况选牌号的判断方法，以及考察厂家时的技术要点。
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Refractory bricks are classified by chemical-mineral composition: fireclay, high-alumina, silica, magnesia and more. This article reviews their properties and applications with a selection method.
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Special-shaped bricks are die-pressed to drawings with tight tolerances and controlled lead times. This article explains the full custom process and quality points for efficient ordering.
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Masonry quality and joint control directly affect lining gas tightness and life. This article covers preparation, joint standards, expansion joints and prevention of common defects.
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High-alumina bricks from bauxite with high Al₂O₃ are the highest-volume shaped refractory in steel, cement, glass and non-ferrous industries. This article covers their classification, properties and applications.
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Refractory precast blocks move formwork and casting from site to factory for stable quality and short outages. This article covers the full process from drawing design and production to site installation.
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