High-Conductivity Carbon Ramming Mass for Blast Furnace Hearth

High-conductivity carbon ramming mass is the last link in a chain, and a chain is only as good as its weakest link. Heat leaves a blast furnace hearth by travelling from the lining, through the carbon block, through the ramming layer, and into the cooling element. If that layer is poorly conductive or badly compacted, the whole path is compromised.

The Layer Nobody Specifies Properly

Specifying excellent carbon brick and then treating the ramming layer as a commodity filler is a common and expensive mistake. The layer has two jobs — conduct heat, and fill completely — and both depend on the material and on how it is installed.

XZK-CG301C carries thermal conductivity ≥12 W/(m·K) at 200 °C with C+SiC ≥91% and crushing strength ≥10 MPa at 1200 °C. XZK-CG301D runs at ≥10 W/(m·K) and ≥6 MPa. Choose on the thermal duty and the mechanical requirement at that position.

Compaction Determines Conductivity

The rated conductivity assumes the specified installed density. Under-compacted ramming mass contains voids, and voids are insulation — so the thermal path degrades exactly where it needs to perform. This is why we ask about ramming access and gap width before quoting, and why we specify layer thickness and compaction method with the material. A crew that gets compaction right is worth more than a marginally better product.

Specified as Part of the Hearth, Not Separately

We specify the ramming mass together with the microporous carbon, the ceramic cup and the stack, bosh and belly grades, so the whole hearth build-up is thermally consistent. Assembling a hearth from parts chosen independently is how mismatches occur — and a mismatch in thermal conductivity is invisible until the furnace is running and temperatures start climbing.

Supply

Minimum order 5 metric tons, shipped in 7–14 days, with grading adjusted for your ramming access and gap width. Batch test data covering C+SiC content, moulded bulk density, crushing strength at 1200 °C and thermal conductivity ships with every lot, along with a written installation procedure.

Where This Grade Sits in the Lining System

Monolithic materials fail more often on installation than on specification. Water demand, mixing time, vibration and the first heat-up curve decide the outcome before the lining ever sees metal — which is why installation parameters are issued with the material instead of being left to site practice.

XZK supplies high-conductivity carbon ramming mass as one zone of a zoned package rather than as a standalone item: the grades normally zoned alongside it — among them microporous carbon brick — are documented on the monolithic refractories page, and the vessel-level architecture — where each zone starts and ends, and which mechanism actually limits the campaign — is set out on the blast furnace page.

Campaign data measured on this class of lining — including the wear profile that drove grade selection — is published in the MMK Magnitogorsk No.10 BF and 375 t ladle programme project reference.