Carbon and graphite blocks
Carbon and graphite blocks
Blocks of carbon and graphite for lining blast furnaces
Carbon and graphite blocks for blast furnaces are used for lining blast furnaces. Thermoanthracite and artificial graphite are the main raw materials used in the production of carbon blocks. Low-sulfur petroleum coke is used in the production of graphite blocks. Medium-temperature coal-tar pitch is used as a binding material. We manufacture rectangular and trapezoidal blocks with fully mechanical high precision:
Maximum block size deviations per brand,mm
| Indicator | DBG | DBU | DBU-0 |
|---|---|---|---|
| Width, Height | ± 0,75 | ± 1,0 | ± 0,5 |
| Length, | Up to 1600mm - ± 1,0 | Up to 1600mm +5,0/-0,0 | Up to 2000mm ± 1,0 |
| Vertically installed rectangular-shaped blocks | Over 1600mm ± 5,0 | Over 2000mm ± 3,0 | |
| Horizontally installed blocks | ± 3,0 | ||
| With free end | ± 10 | ± 10 | Up to 2000mm ± 1,0 |
| Without free end | ± 5,0 | ± 5,0 | Over 2000mm ± 3,0 |
Quality control machining
The machining quality is controlled at a special test bench. The test bench enables to implement a control assembly of the bottom and hearth parts for blast-furnaces of all dimensions and types.
Toletance interval, mm
| INDICATOR | DBU | DBU-0 | DBG |
|---|---|---|---|
| Horizontal gap between the blocks and the line, maximum | 1,5 | ||
| Gap between the block vertical faces, maximum | |||
| Deviation from the nominal circular rows diameter of the hearth bottom block at the outer diameter and the hearth deviation at the inner diameter, maximum |
+10 |
+10mm | +10mm |
| -20 | -20mm |
Qualitative properties of blast furnance blocks
| PROPERTIES | UNIT OF MEASURE | TEST METHOD | DBG VALUES TU 48-12-37-91 | DBU, DBU-0 VALUES TU 48-12-18-88 |
|---|---|---|---|---|
| Total porosity* | % | TU48-12-37-91 for DBG TU 48-12-18-88 for DBU, DBU-0 |
maximum 30,0 | maximum 20,0 |
| Compressive strength | MPa | ISO 18515 | No less than 17,6 | No less than 31,4 |
| Electrical resistance | µOm·m | ISO 11713 | - | maximum 80,0 |
| Thermal conductivity at 20°С | W/mK | ISO 12987 | No less than 80,0 | - |
| * - calculated as the ratio of the difference between the actual and the apparent density to the actual density. | ||||
