Description
The JH-JRD/JH-LW modular precast block series enables fast-track heating furnace construction through factory-pre-assembled wall and roof modules. This system effectively overcomes critical on-site casting challenges including improper water addition, non-uniform mixing, inadequate vibration, improper expansion joint sealing, and winter construction limitations. The pre-assembled approach significantly reduces field installation time and shortens the drying and heating-up periods. Available in high-alumina working lining grades providing thermal shock resistance and durability at elevated service temperatures, complemented by lightweight insulation grades for thermal efficiency, these modular blocks help steel plants optimize furnace performance and extend operational campaign life.
Key Features
- Factory-pre-assembled modules eliminate on-site casting quality issues for consistent furnace lining performance.
- Modular design achieves rapid furnace construction and reduces overall project timeline significantly.
- Pre-formed expansion joints ensure proper sealing throughout the furnace structure.
- Enables construction during low-temperature seasons when traditional casting is impractical.
- Multiple grade options support optimized working lining and insulation layer configurations.
Application
- Reheating furnaces and walking-beam furnaces in steel rolling mills.
- Pusher-type furnaces for billet, slab, and plate heating applications.
- Heat treatment furnaces requiring reliable working lining performance.
- Regenerative furnace systems with demanding thermal cycling requirements.
- Furnace wall and roof sections in industrial heating applications.
Technical Specifications
Physical and chemical Performance Indicators of Precast Block
| Grade | JH-JRD60 | JH-JRD65 | JH-LW0.8 | JH-LW1.0 |
| Al2O3 (%) | 60 | 65 | 25 | 28 |
| Bulk Density (g/cm3) | ≥2.3 | ≥2.4 | 0.8±0.1 | 1.0±0.1 |
| Permanent Linear Change (% at 110°C×16h) | -0.2~0 | -0.2~0 | -0.2~0 | -0.2~0 |
| Permanent Linear Change (% at 1350°C×3h) | -0.5~+0.5 | -0.5~+0.5 | -1.0~0 (800°C×3h) | -1.0~0 (1000°C×3h) |
| Modulus of Rupture (MPa) at 110°C×16h | 5 | 8 | – | – |
| Modulus of Rupture (MPa) at 1350°C×3h | 8 | 8 | – | – |
| Cold Crushing Strength (MPa) at 110°C×16h | 45 | 50 | 1 | 3 |
| Cold Crushing Strength (MPa) at 1350°C×3h | 60 | 60 | 1 (800°C×3h) | 3 (1000°C×3h) |
| Long-term Service Temperature (°C) | 1350 | 1350 | 900 | 1000 |
| Application | Working lining | Working lining | Insulation lining | Insulation lining |
| Packaging | – | – | – | – |
