Low Creep Mullite Brick
Application Industry: Refractories for Steel Industry
Application Equipment: Blast Furnace Hot Air Furnace and Hot Blast Stove
Size: 230 x 114 x 65 mm (custom sizes and shapes available on request)
Products Overview
Our Low Creep Mullite Brick series is a dense refractory product family engineered for the hot air furnace lining of small, medium, and large blast furnaces. The product is manufactured from synthetic mullite as the main raw material, formed under high pressure molding and high temperature firing, giving a brick with stable volume and small creep rate under prolonged high temperature conditions and supporting the hot air furnace of large and medium sized blast furnaces.
The Low Creep Mullite Brick product family is offered in five sintered-mullite grades (DRM72, DRM70, DRM65, DRM60, and DRM56) covering an Al2O3 content range of 56% to 72% and a refractoriness range of 1790 to 1830 °C. This range allows the lining designer to balance refractoriness, thermal shock resistance, and creep behaviour across the combustion chamber, checker chamber, and dome zones of the hot air furnace. The DRM72 and DRM70 grades are creep-rated at 1500 °C under 50-hour load and are recommended for the most demanding high temperature zones, while DRM65, DRM60, and DRM56 are typical workhorse grades for the intermediate and cooler lining zones of the hot air furnace lining.
Sourced from our Xinmi City, Zhengzhou, Henan, China facility, each Low Creep Mullite Brick is engineered to ASTM, GB/T, and ISO refractory standards. For an overview of the broader catalogue, see the Refractories for the Steel Industry category, or contact our technical sales team for a free consultation against your refractory drawing.
Product Features
- Engineered from synthetic mullite with low impurity content and large heat storage capacity
- Small creep rate under high temperature and high temperature conditions, prolonging lining service life
- Excellent thermal shock resistance for the heating and blasting cycle of hot air furnace
- High refractoriness up to 1830 °C with stable volume and high structural integrity
- Five grades DRM72, DRM70, DRM65, DRM60, and DRM56 covering Al2O3 range 56 to 72 percent
Product Specification
Standard size: 230 x 114 x 65 mm. Custom sizes, shapes, and tolerances are available on request and quoted against the buyer’s refractory drawing.
| Items | Brands | ||||
|---|---|---|---|---|---|
| DRM72 | DRM70 | DRM65 | DRM60 | DRM56 | |
| Al2O3 content ≥ (%) | 72 | 70 | 65 | 60 | 56 |
| Fe2O3 content ≤ (%) | 0.8 | 0.8 | 0.8 | 1.0 | 1.0 |
| Refractoriness ≥ (°C) | 1830 | 1830 | 1790 | 1790 | 1790 |
| Apparent Porosity ≤ (%) | 19 (21) | 19 (21) | 19 (21) | 19 (22) | 19 (22) |
| Cold Crushing Strength ≥ (MPa) | 70 (60) | 70 (60) | 70 (50) | 60 (50) | 60 (50) |
| Refractoriness Under Load ≥ (°C, 0.2 MPa) | 1700 | 1650 | 1630 | 1600 | 1580 |
| Reheating Linear Change (1500°C × 2h) (%) | ±0.2 | ±0.2 | ±0.2 | ±0.2 | ±0.2 |
| Thermal Shock Resistance ≥ (cycles, 1100°C) | 35 | 30 | 30 | 20 | 15 |
| Creep Rate ≤ (%) | 0.6 (1500°C×50h) | 0.6 (1500°C×50h) | 0.6 (1450°C×50h) | 0.8 (1400°C×50h) | 0.8 (1350°C×50h) |
Note: Values in parentheses are the maximum permitted under reduced test temperature conditions per GB/T 3995. For project-specific chemistry and dimensional data, contact CH Refractories engineering.
Product Applications
Low Creep Mullite Bricks are dense refractory bricks manufactured from synthetic mullite, engineered for the hot air furnace lining of small, medium, and large blast furnaces. The product family covers five sintered-mullite grades (DRM72, DRM70, DRM65, DRM60, and DRM56) covering an Al2O3 content range of 56% to 72% and a refractoriness range of 1790 to 1830 °C, allowing the metallurgist to match each lining zone to the optimal combination of refractoriness, thermal shock resistance, creep behaviour, and cost.
Application Industry: Refractories for the Steel Industry and the broader Metallurgical Industry.
Target Equipment: Hot Air Furnace (Cowper stove) of small, medium, and large Blast Furnaces.
Specific Lining Zones: DRM72 and DRM70 are the creep-rated grades for the combustion chamber and hottest zones of the hot air furnace. DRM65 is the workhorse grade for the combustion chamber, dome, and upper checkerwork. DRM60 is used for the sidewalls and intermediate checkerwork. DRM56 is the cost-effective grade for the lower checkerwork and cooler lining zones of the hot air furnace lining.
CH Refractories is a Low Creep Mullite Brick manufacturer in China, Henan, Zhengzhou. The complete Low Creep Mullite Brick product family is manufactured in our Xinmi City, Zhengzhou, Henan, China facility to ASTM, GB/T, and ISO refractory standards. Each low creep mullite brick is engineered to the buyer’s refractory drawing and supported by free consultation, free 3D design, on-site technical support, and a dedicated engineering team serving Refractories for the Steel Industry customers across the global iron and steel value chain.
