Description
JHR self-flow castables are engineered with optimized raw material selection, controlled particle size distribution, ultrafine powder technology, and high-efficiency dispersants to deliver superior flowability and self-leveling performance. These castables consolidate readily under gravity, providing excellent volume stability and thermal shock resistance during heating and cooling cycles. The formulation is specifically developed for reheating furnace applications involving complex shapes, narrow passages, and restricted access areas where vibration or ramming is impractical. Proven in over 100 steelmaking and forging operations across China, including Baowu, Wugang, Chenggang, Shaogang, and Hansteel, JHR self-flow castables have been successfully installed in more than 500 reheating furnaces, making them a reliable choice for demanding industrial environments.
Key Features
- Excellent self-flow and self-leveling properties enable placement in complex geometries and confined spaces without vibration.
- Optimized porosity and microstructural design deliver strong thermal shock stability for cyclic heating furnace operations.
- Controlled dimensional behavior ensures reliable volume stability through repeated thermal cycles up to 1350°C service temperature.
- High-efficiency dispersant system achieves dense, low-permeability microstructure for improved slag and erosion resistance.
- Proven field performance: adopted by 100+ steel plants in over 500 reheating furnace installations across China.
Application
- Walking-beam and pusher-type reheating furnaces in steel rolling and forging operations.
- Complex-shaped zones, narrow passages, and space-constrained areas where vibration casting is impractical.
- Regenerative burner blocks and combustion chamber linings in high-temperature heating furnaces.
- Flue walls, uptake tubes, and transition zones in gas-fired or fuel-fired reheating furnace settings.
- Continuous casting and rolling mill reheating furnaces requiring durable, crack-resistant monolithic linings.
Technical Specifications
Physical and chemical Performance Indicators of Self-flowing Castables
| Grade | JH-SF55 | JH-SF60 | JH-SF65 | JH-SF70 |
| Al₂O₃ (%) | 55 | 60 | 65 | 70 |
| Bulk Density (g/cm3) at 110°C×16h | 2.2 | 2.25 | 2.3 | 2.4 |
| Permanent Linear Change (% at 1350°C×3h) | -0.5~+0.5 | -0.5~+0.5 | -0.5~+0.5 | -0.5~+0.5 |
| Modulus of Rupture (MPa) at 110°C×16h | 6 | 6 | 6 | 6 |
| Modulus of Rupture (MPa) at 1350°C×3h | 8 | 8 | 8 | 9 |
| Cold Crushing Strength (MPa) at 110°C×16h | 35 | 40 | 40 | 40 |
| Cold Crushing Strength (MPa) at 1350°C×3h | 55 | 60 | 65 | 70 |
| Service Temperature (°C) | 1350 | 1350 | 1350 | 1350 |
| Packaging | 25kg/bag + ton bag, Moisture-proof, Shelf life: 6 months | 25kg/bag + ton bag, Moisture-proof, Shelf life: 6 months | 25kg/bag + ton bag, Moisture-proof, Shelf life: 6 months | 25kg/bag + ton bag, Moisture-proof, Shelf life: 6 months |
