Magnesia refractories
Chrome-magnesia brick KhP
Refractory brick made of chromite and periclase for electric furnace roofs and units with severe service conditions. Five grades, straight brick and wedges.
- Type
- Shaped refractory, brick
- Base
- Chromite and periclase
- Grades
- KhP1, KhP2, KhP3, KhP4, KhP5
- Application
- Electric furnace roofs, non-ferrous and ferroalloy furnaces
- Shape
- Straight brick, end, side and transition wedges
- Standard
- GOST 5381-93
Description
Chrome-magnesia brick KhP (ХП) is a fired refractory based on chromite ore, with periclase (MgO) added for strength and slag resistance. It contains more chromium oxide than magnesia-chrome brick: at least 15–22 % Cr₂O₃ with 42–46 % MgO. Refractoriness is at least 2000 °C. The brick is made to GOST 5381-93 in five grades: KhP1, KhP2, KhP3, KhP4 and KhP5 (ХП1–ХП5).
During firing, chromite and periclase form spinels, compounds that resist basic and iron-rich slags. As a result, the brick reacts little with slag, keeps its shape at high temperature and handles temperature swings during start-ups and shutdowns better than pure periclase brick. It is installed where the refractory is heated by the flame, splashed with slag and works under load at the same time. The higher the grade, the less silica the brick contains and the denser its structure: such a lining holds the melt longer and absorbs less slag.
The grade is chosen by temperature and service conditions. KhP1 is for roofs of small electric arc furnaces and units with severe service conditions. KhP2 is for roofs of electric steelmaking furnaces and units operating at 1700–1750 °C. KhP3 and KhP4 are for lining units at 1500–1700 °C, and KhP5 up to 1500 °C. Chrome-magnesia brick is used in ferrous and non-ferrous metallurgy and in ferroalloy production. If you are not sure about the grade, send us the operating conditions of your unit and we will select the grade and shape numbers for your lining.
The product designation combines the grade and the shape number under GOST: for example, KhP-1-7 (ХП-1-7) is grade KhP1, shape No. 7, a 230×115×65 mm side wedge. Ten shapes are made for each grade: two straight bricks, four end wedges, two side wedges and two transition wedges. We also supply products to the customer’s drawing. The brick is laid with mortar according to the lining design and stored dry, on pallets under a roof.
Technical data
| Property | KhP1 | KhP2 | KhP3 | KhP4 | KhP5 |
|---|---|---|---|---|---|
| MgO content, %, min | 46 | 46 | 42 | 42 | 42 |
| Cr₂O₃ content, %, min | 22 | 22 | 20 | 15 | 15 |
| SiO₂ content, %, max | 6 | 7 | 8 | 8 | 8 |
| Apparent porosity, %, max | 20 | 22 | 23 | 24 | 25 |
| Bulk density, g/cm³, min | 2.95 | 2.95 | 2.95 | — | — |
| Cold crushing strength, N/mm², min | 30 | 27.5 | 25 | 25 | 20 |
| Refractoriness under load (onset of softening), °C, min | 1550 | 1520 | 1500 | 1500 | 1450 |
| Thermal shock resistance (1300 °C — water), cycles, min | 2 | 2 | 2 | — | — |
Shapes and designations
| No. | Shape | Dimensions, mm | Weight, kg | Designations |
|---|---|---|---|---|
| 1 | Straight brick | 230×115×65 | 4.80 | KhP-1-1, KhP-2-1, KhP-3-1, KhP-4-1, KhP-5-1 |
| 2 | Straight brick | 300×150×65 | 8.20 | KhP-1-2, KhP-2-2, KhP-3-2, KhP-4-2, KhP-5-2 |
| 3 | End wedge | 230×115×65, S1 = 45 | 4.10 | KhP-1-3, KhP-2-3, KhP-3-3, KhP-4-3, KhP-5-3 |
| 4 | End wedge | 230×115×65, S1 = 55 | 4.45 | KhP-1-4, KhP-2-4, KhP-3-4, KhP-4-4, KhP-5-4 |
| 5 | End wedge | 230×115×65, S1 = 60 | 4.60 | KhP-1-5, KhP-2-5, KhP-3-5, KhP-4-5, KhP-5-5 |
| 6 | End wedge | 200×120×70, S1 = 62 | 4.40 | KhP-1-6, KhP-2-6, KhP-3-6, KhP-4-6, KhP-5-6 |
| 7 | Side wedge | 230×115×65, S1 = 45 | 4.10 | KhP-1-7, KhP-2-7, KhP-3-7, KhP-4-7, KhP-5-7 |
| 8 | Side wedge | 230×115×65, S1 = 55 | 4.45 | KhP-1-8, KhP-2-8, KhP-3-8, KhP-4-8, KhP-5-8 |
| 9 | Transition wedge | 230×115×65, B1 = 70 | 3.85 | KhP-1-9, KhP-2-9, KhP-3-9, KhP-4-9, KhP-5-9 |
| 10 | Transition wedge | 230×115×65, B1 = 93 | 4.35 | KhP-1-10, KhP-2-10, KhP-3-10, KhP-4-10, KhP-5-10 |
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