产品之七： 轧钢加热炉之平台砖Product Seven: Platform Bricks for Steel Rolling Heating Furnaces

每天面对1300~1400℃的高温炙烤、钢坯的剧烈碰撞、熔渣的持续侵蚀，平台砖的耐用性直接决定了加热炉的运行周期、生产效率乃至企业的经济效益。在众多耐火材料中，铬刚玉与铝锆质平台砖凭借出色的性能脱颖而出，成为中高端轧钢生产线的精选。今天，我们就从材质特性、适用场景出发，结合河南我公司的实战案例，聊聊如何选对这层“高温防护甲”。

Facing daily scorching temperatures of 1300-1400℃, intense impacts from steel billets, and continuous erosion from molten slag, the durability of platform bricks directly determines the operating cycle, production efficiency, and even the economic benefits of the heating furnace. Among numerous refractory materials, chromium corundum and alumina-zirconium platform bricks stand out due to their superior performance, becoming the preferred choice for mid-to-high-end steel rolling production lines. Today, we'll discuss how to choose the right "high-temperature protective armor," starting from material characteristics and applicable scenarios, combined with practical cases from our company in Henan.

铝铬质平台砖：性价比与实用性的平衡之选
铝铬质平台砖以刚玉和三氧化二铬为核心成分，杂质含量极低，高温化学稳定性强，兼具高熔点、高硬度、高强度的特性。其最突出的优势的是抗侵蚀性和抗热震性——当熔渣渗入砖体后，会形成铁铝尖晶石和铁铬尖晶石保护层，像一层“隐形铠甲”阻止熔渣进一步渗透，有效减轻结构剥落问题。同时，铝铬质平台砖可采用棕刚玉为主要原料，原料成本相对可控，能在保证性能的前提下兼顾性价比。

从适用场景来看，铝铬质平台砖更适合中等负荷的轧钢加热炉，尤其适用于出钢平台、炉底滑轨等受钢坯冲击和熔渣侵蚀较明显的部位。对于追求“性能达标、成本优化”的生产线，铝铬质平台砖无疑是理想选择，其使用寿命通常可达1年以上，远超传统刚玉砖和碳化硅砖。

Alumina-chrome platform bricks: A balance of cost-effectiveness and practicality. Alumina-chrome platform bricks use corundum and chromium trioxide as their core components, with extremely low impurity content and strong high-temperature chemical stability. They also possess high melting point, high hardness, and high strength. Their most prominent advantages are their resistance to erosion and thermal shock—when molten slag penetrates the brick, it forms a protective layer of iron-aluminum spinel and iron-chromium spinel, acting like an "invisible armor" to prevent further slag penetration and effectively reduce structural spalling. Furthermore, alumina-chrome platform bricks can use brown corundum as the main raw material, making raw material costs relatively controllable, thus balancing cost-effectiveness while ensuring performance.

In terms of application scenarios, alumina-chrome platform bricks are more suitable for medium-load steel rolling furnaces, especially for areas such as tapping platforms and furnace bottom rails that are significantly impacted by steel billets and corroded by molten slag. For production lines seeking "performance compliance and cost optimization," alumina-chrome platform bricks are undoubtedly an ideal choice, with a service life typically exceeding one year, far surpassing traditional corundum bricks and silicon carbide bricks.

铝锆质平台砖：极端工况下的性能王者

铝锆质平台砖（常称AZS砖）则是铝氧化物与锆氧化物的复合材质，典型配比约为70%氧化铝与30%氧化锆，部分产品会添加微量硼砂、硅溶胶等助剂优化烧结性能。其制造工艺堪称严苛，需在2200℃的高温电弧炉中熔化原料，经铸造冷却后切割成型，能承受超过1600℃的极端高温。
相较于铝铬质砖，铝锆质平台砖的高温稳定性、耐磨性和抗热震性更上一层楼。锆氧化物的加入让砖体形成致密结构，体积密度更高，即便在温度急剧波动的工况下，也能有效避免开裂变形，就像拥有“超强心脏”的卫士，守护极端高温环境下的生产稳定。不过，其原料和生产工艺成本较高，更适合高负荷、高温差、熔渣腐蚀性强的高端轧钢生产线，如带钢加热炉、钢锭加热炉的核心区域。

Alumina-zirconium platform bricks: Performance champions under extreme conditions

Alumina-zirconium platform bricks (commonly known as AZS bricks) are composite materials of aluminum oxide and zirconium oxide, with a typical ratio of approximately 70% alumina and 30% zirconium oxide. Some products add trace amounts of borax, silica sol, and other additives to optimize sintering performance. Their manufacturing process is extremely demanding, requiring the raw materials to be melted in a high-temperature electric arc furnace at 2200℃, cast, cooled, and then cut into shape. They can withstand extreme temperatures exceeding 1600℃.

Compared to alumina-chrome bricks, alumina-zirconium platform bricks offer superior high-temperature stability, wear resistance, and thermal shock resistance. The addition of zirconium oxide creates a dense structure with higher bulk density, effectively preventing cracking and deformation even under conditions of rapid temperature fluctuations. Like a guardian with a "super-strong heart," they protect production stability in extreme high-temperature environments. However, their raw material and production process costs are higher, making them more suitable for high-load, high-temperature-difference, and highly corrosive high-slag rolling mill production lines, such as the core areas of strip steel heating furnaces and ingot heating furnaces.

我公司 铝铬质+铝锆质复合配置 平台砖

我公司的技术团队深入生产现场调研，结合该加热炉的工况特点（温度1350℃左右、钢坯冲击频繁、熔渣侵蚀较强），制定了“分区适配”的复合配置方案，兼顾性能与成本：
- 出钢平台及炉底滑轨中段（受冲击和侵蚀中等部位）：采用定制款铝铬质平台砖。我公司优化原料配比，选用高纯度棕刚玉为骨料，搭配氧化铬绿和电熔氧化铬粉料，经震动压力机压制成型后，在1600℃高温天然气梭式窑中烧结而成。砖体体积密度≥3.0g/cm³，耐压强度超120MPa，抗热震稳定性显著提升，能有效抵御钢坯碰撞和熔渣侵蚀。

Our company's aluminum-chrome and aluminum-zirconium composite platform bricks

Our technical team conducted in-depth research at the production site and, considering the operating characteristics of the heating furnace (temperature around 1350℃, frequent billet impact, and strong slag erosion), developed a "zonal adaptation" composite configuration scheme that balances performance and cost:

- The steel tapping platform and the middle section of the furnace bottom slide rail (areas subject to moderate impact and erosion): Custom-made aluminum-chrome platform bricks are used. Our company optimized the raw material ratio, selecting high-purity brown corundum as aggregate, combined with chromium oxide green and fused chromium oxide powder. After being pressed into shape by a vibratory press, it is sintered in a 1600℃ high-temperature natural gas shuttle kiln. The brick's bulk density is ≥3.0g/cm³, compressive strength exceeds 120MPa, and thermal shock resistance is significantly improved, effectively resisting billet impact and slag erosion.

- 加热炉均热段（高温核心区、侵蚀最严重部位）：采用铝锆质平台砖。产品以优质电熔锆刚玉为原料，通过我公司自主研发的纳米添加剂改性技术，解决了纳米氧化铝易团聚的问题，让砖体形成更细密的分散相，有效阻碍裂纹扩展，提升韧性和强度。同时，定制化的砖体形状适配炉体结构，确保砌筑后的密封性和稳定性。

- Soaking zone of the heating furnace (high-temperature core area, most severely corroded part): Alumina-zirconia platform bricks are used. The product uses high-quality fused zirconia corundum as raw material, and through our independently developed nano-additive modification technology, the problem of easy agglomeration of nano-alumina is solved, allowing the brick to form a finer dispersed phase, effectively inhibiting crack propagation and improving toughness and strength. At the same time, the customized brick shape adapts to the furnace structure, ensuring sealing and stability after installation.

该方案实施后，经18个月的连续运行验证，取得了显著成效：加热炉平台砖无明显磨损、开裂现象，使用寿命延长至2年以上，停炉维修次数从每年2次减少至每2年1次。仅减少停炉带来的增产效益就超5000万元，同时因砖体隔热性能优异，加热炉天然气单耗下降约12%，年节省能耗成本近700万元。我公司的产品先后在韶钢，萍钢，邯钢， 成钢等国内几十家大中型钢铁企业的轧钢加热炉上得到了广泛应用， 均取得良好的使用效果。不沾渣浇注料应用于加热炉炉底， 平台等部位， 使用过程中不沾渣， 耐磨性能优异。

After 18 months of continuous operation and verification following the implementation of this solution, significant results were achieved: the heating furnace platform bricks showed no obvious wear or cracking, their service life was extended to more than 2 years, and the number of shutdowns for maintenance was reduced from twice a year to once every two years. The increased production benefits from reduced shutdowns alone exceeded 50 million yuan. Simultaneously, due to the excellent thermal insulation performance of the bricks, the natural gas consumption per unit of the heating furnace decreased by approximately 12%, saving nearly 7 million yuan in energy costs annually. Our company's products have been widely used in the rolling mill heating furnaces of dozens of large and medium-sized steel enterprises in China, including Shaoguan Steel, Pingxiang Steel, Handan Steel, and Chengdu Steel, achieving excellent results. The non-stick slag castable is used in the furnace bottom, platform, and other parts of the heating furnace, exhibiting excellent wear resistance and slag-free properties during use.

结合上述分析和实战案例，轧钢企业在选择铝铬质、铝锆质平台砖时，可遵循以下原则：
1. 按工况负荷选型：中等负荷、追求性价比，优先选铝铬质平台砖；高负荷、极端高温工况，重点考虑铝锆质平台砖。

2. 优先选择定制化方案：不同加热炉的结构、工况存在差异，像我公司这样能结合实际需求优化配方和尺寸的厂商，能让材料性能最大化发挥。

3. 重视全生命周期成本：不要只看初期采购价，使用寿命、维修频率、能耗影响等综合成本，才是决定长期效益的关键。

轧钢加热炉的稳定运行，离不开每一块平台砖的坚守。铝铬质与铝锆质平台砖凭借各自的性能优势，为不同工况的生产线提供了可靠保障，而河南我公司的实战案例则证明，优质的产品与定制化方案，能让耐火材料真正成为企业降本增效、提升竞争力的助力。选择对的平台砖，就是为轧钢生产线筑牢“高温防线”，为企业的持续发展保驾护航。

Based on the above analysis and practical case studies, steel rolling mills can follow these principles when selecting alumina-chrome and alumina-zirconium platform bricks:

1. Select according to operating load: For medium loads and cost-effectiveness, prioritize alumina-chrome platform bricks; for high loads and extreme high-temperature conditions, focus on alumina-zirconium platform bricks.

2. Prioritize customized solutions: Different heating furnaces have different structures and operating conditions. Manufacturers like our company, which can optimize formulas and dimensions based on actual needs, can maximize material performance.

3. Emphasize total life cycle cost: Don't just look at the initial purchase price; the comprehensive cost, including service life, maintenance frequency, and energy consumption impact, is the key to long-term benefits.

The stable operation of steel rolling mill heating furnaces depends on the consistent use of every platform brick. Alumina-chrome and alumina-zirconium platform bricks, with their respective performance advantages, provide reliable protection for production lines under different operating conditions. Our company's practical case studies in Henan demonstrate that high-quality products and customized solutions can truly make refractory materials a driving force for cost reduction, efficiency improvement, and enhanced competitiveness for enterprises. Choosing the right platform bricks is to build a "high-temperature defense line" for the steel rolling production line and safeguard the company's sustainable development.