MgO-C Brick Manufacturer & Custom Steel Plant Refractories

MgO-C brick for ladle slag line, BOF and EAF

MgO-C brick is fused or sintered magnesia bonded with graphite and resin. It is tempered, not fired. Graphite content is chosen by zone, commonly between 10 and 20 percent. We match the grain curve, carbon source and antioxidant system to your slag and your steel grade. See our MgO-C brick page and the steel ladle refractory solution.

MgO-CaO and MgO-Cr2O3 brick

MgO-CaO brick suits clean steel work where carbon pickup matters. Its weak point is free CaO, which reacts with moisture in humid air, so the packing is sealed (see Step 6). MgO-Cr2O3 brick is used in RH degassers and other zones where volume stability matters. Used chrome-bearing brick should be handled under your local rules for hexavalent chromium. We can send handling guidance with the order.

Precast shapes and monolithic refractories

Precast shapes are cast in the factory, cured and dried before shipping, so installation on site is shorter. Monolithics include castables, gunning mixes, ramming mixes and dry mixes, packed in moisture-protected big bags with an installation guide.

Step 1: Your slag data becomes a formulation

Two ladles with the same brick grade can wear very differently because the slag is different. So we do not quote from a catalog grade. We start from your operating conditions.

What you send

• Slag analysis: CaO, SiO2, Al2O3, MgO, FeO, MnO
• Steel grades and refining route
• Temperature and treatment time
• Current brick grade, heat count and failure mode
• Failure photos and residual thickness

What we adjust

• Magnesia type and grain size curve
• Carbon source and content
• Antioxidant system
• Binder and curing
• Porosity and density target

What you receive

A recommended grade for your zone, a TDS with agreed property windows, a trial or pilot lining plan, batch records with a COA, and a follow-up on service results.

Three slag cases we see often

Step 2: Raw material control before batching

No lot goes into a batch until it is released. A grade change is a formulation decision, not a trading decision.

1. Lot recorded. Supplier, grade, size fraction and lot number are logged on receipt.
2. Sampled. A representative sample is taken from every incoming lot.
3. Checked. Chemistry, grain size and visual inspection against the grade specification.
4. Released or held. Only released lots go to batching. Others are tagged and held.
5. Stored, sample kept. The lot goes to a marked bay and a retained sample is kept.

Step 3: LAEIS 2500 t press and forming line

The brick is made at the press. Density and porosity are set there, and they decide how fast slag can penetrate the lining. Our forming line is built around a LAEIS 2500 t hydraulic press.

Bricks are formed using brick presses. This process determines the density and porosity of the bricks—parameters that dictate the rate at which slag penetrates the lining. Our brick-forming production line is centered around a 2,500-ton LAEIS hydraulic press, complemented by 12 additional presses with capacities ranging from 800 to 2,100 tons.

Why press capacity matters to your lining life

• Density and porosity. High forming force closes pores. Fewer open pores mean slower slag penetration.
• Large, heavy shapes. A 2500 t press can form big-format bricks for ladle and converter linings.
• Repeatability. A robot cell takes pressed bricks off the press, so handling is the same from brick to brick.

Size check and trial assembly

Pressed bricks are measured at the press, so size errors are caught there and not in the vessel. Rings are dry laid out and marked before packing. Fit is proven and the installation order is clear.

Step 4: MgO-C brick core process, six stages

Step 5: Laboratory verification before shipment

High-temperature strength and thermal conductivity are tested in our own laboratory. The results go into the batch record and the COA, so you can compare our numbers with your own incoming inspection.

• Hot modulus of rupture (HMOR). Strength at service temperature. It shows how the brick holds up against flow and erosion.
• Hot-wire thermal conductivity. Heat loss through the lining. It matters for shell temperature and steel temperature drop.
• Also tested per grade. Chemical composition, bulk density and apparent porosity, cold crushing strength, and oxidation and coking behavior for carbon grades.

What to ask us for

A TDS, a COA from a recent batch, and a retained sample from the same lot you order.

Step 6: Export packing and container loading

We pack each product form differently, and we mark every pallet and crate. Tell us your storage time and unloading method before we pack.

For MgO-CaO brick we use sealed, moisture-proof packing and ask for your expected storage time. In containers, crates go in tiers with crossed ratchet straps, and big bags go two high, cross-strapped and wedged at the floor. You can ask for photos of the load before the doors close.

Step 7: Installation support and used-lining feedback

The order does not end at delivery. It ends when the lining has been read and the next formulation is set.

1. The order does not end at delivery. It ends when the lining has been read and the next formulation is set.
2. Install. Ring order, joint thickness and fit are agreed with your crew, on site or by video.
3. Dry-out and heat-up. The heat-up curve is agreed in advance, so the first heat does not shock the lining.
4. In service. You log heats, slag basicity and temperature. We ask for first-campaign checks.
5. After the campaign. Residual thickness, wear map and photos come back to us.

Four readings that start a review