BF hearth carbon blocks including micropore and semi-graphite grades offer high thermal conductivity and strong resistance to molten iron penetration, key to long-lasting blast furnace bottoms and hearths.
| Bulk density | ≥1.55 g/cm³ |
|---|---|
| Apparent porosity | ≤20% |
| Cold crushing strength | ≥35 MPa |
| Thermal conductivity (20℃) | ≥10 W/(m·K) |
| Ash content | ≤10% |
| Molten iron erosion resistance | 优 |
Blast furnace hearth carbon blocks are large carbon refractory products made from high-quality anthracite and graphite, processed by high-temperature baking or graphitization. They are classified as ordinary carbon blocks, micropore carbon blocks and semi-graphite carbon blocks. Carbon blocks offer high thermal conductivity, strong resistance to molten iron penetration and low thermal expansion, making them the classic long-life material for blast furnace bottoms and hearths. Combined with proper cooling structure and ramming layer design, they enable BF campaigns of 10 years or more.
Ordinary carbon blocks are cost-effective; micropore blocks have finer pores and stronger resistance to iron penetration, suitable for the hot face of the bottom; semi-graphite blocks have the best thermal conductivity for use with cooling staves. Selection depends on furnace volume, cooling design and operating practice.
Joint control is critical; thin-joint laying with carbonaceous mortar is standard, combined with ramming and leveling layers. We provide laying schemes and on-site technical guidance.
Major reline orders generally take 30–60 days depending on specifications and quantity; we recommend placing orders 2–3 months ahead.
Yes. We support custom processing according to bottom brick-type drawings and provide an overall solution from material selection and layout to supply.
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