Magnesia Chrome Brick for Steel Industry

Q: Q3: What are the key physical properties of magnesia chrome brick?

A3: Magnesia Chrome Brick delivers SiO2 content maximum 1.5% across all five grades. Apparent Porosity reaches maximum 16% for CH-MCr-D26, CH-MCr-D20A, CH-MCr-B20A, and CH-MCr-Z8A grades, and maximum 18% for CH-MCr-B16A grade. Cold Crushing Strength is minimum 40 MPa for all five grades. Refractoriness Under Load is minimum 1700 C at 0.2 MPa for all five grades. The CH-MCr-D26 grade has the highest chrome content (Cr2O3 minimum 26%) for the most demanding erosion parts, while the CH-MCr-Z8A grade has the lowest chrome content (Cr2O3 minimum 8%) but highest MgO content (minimum 65%) for secondary working lining service.

Application Industry: Refractories for Steel Industry

Application Equipment: RH Degasser and Secondary Refining Ladle Lining

Size: Standard brick geometry per ladle lining design (custom sizes available on request)

Consultation：

Leave Message

Products Overview

Our Magnesia Chrome Brick is a high-performance refractory brick engineered for RH degasser and secondary refining ladle lining service. The product family is manufactured from sintered magnesia and chromite as the main raw materials with high-temperature sintering process, showing high refractoriness, excellent thermal shock resistance, and good slag erosion resistance. The product is widely used in steelmaking secondary refining operations where demanding slag attack and thermal cycling conditions exist.

The Magnesia Chrome Brick product family is offered in five engineering-proven MCr chemistry grades with three bonding types. The CH-MCr-D26 grade (fused re-bonded MgO-Cr₂O₃) features MgO content minimum 53% and Cr₂O₃ content minimum 26% for circulation tubes, bottom groove, and other erosion parts. The CH-MCr-D20A grade (fused semi re-bonded MgO-Cr₂O₃) features MgO content minimum 50% and Cr₂O₃ content minimum 20% for dip tubes, bottom through, and central through positions. The CH-MCr-B20A grade (fused semi re-bonded MgO-Cr₂O₃) features MgO content minimum 50% and Cr₂O₃ content minimum 20% for upper through and similar positions. The CH-MCr-B16A grade (direct-bonded MgO-Cr₂O₃) features MgO content minimum 55% and Cr₂O₃ content minimum 16% for upper tube and hypo-working lining positions. The CH-MCr-Z8A grade (direct-bonded MgO-Cr₂O₃) features MgO content minimum 65% and Cr₂O₃ content minimum 8% for secondary working lining service.

Sourced from our Xinmi City, Zhengzhou, Henan, China facility, each Magnesia Chrome Brick grade is engineered to ASTM, GB/T, and ISO refractory standards. For an overview of the broader catalogue, see the Refractories for the Steel Industry category, or contact our technical sales team for a free consultation against your refractory drawing.

Product Features

Features:

Manufactured from sintered magnesia and chromite as the main raw materials with high-temperature sintering
Engineering-proven high refractoriness and excellent thermal shock resistance for ladle service
Three bonding types available: fused re-bonded, fused semi re-bonded, and direct-bonded MgO-Cr₂O₃ bricks
Excellent slag resistance and erosion resistance for demanding ladle lining service
Five MCr chemistry grades covering MgO content 50%-70% and Cr₂O₃ content 8%-26% for matching different ladle service zones

Product Specification

Magnesia chrome brick is engineered per buyer’s RH degasser and secondary refining ladle lining design. Custom chemistry and geometry available on request.

Brands Items	Fused re-bonded MgO-Cr₂O₃ bricks		Fused semi re-bonded MgO-Cr₂O₃ bricks		Direct-bonded MgO-Cr₂O₃ bricks
Brands Items	CH-MCr-D26	CH-MCr-D20A	CH-MCr-B20A	CH-MCr-B16A	CH-MCr-Z12A	CH-MCr-Z8A
MgO content (%)	≥ 53	≥ 50	≥ 50	≥ 55	≥ 65	≥ 70
Cr₂O₃ content (%)	≥ 26	≥ 20	≥ 20	≥ 16	≥ 12	≥ 8
SiO₂ content (%)	≤ 1.5	≤ 1.5	≤ 1.5	≤ 1.5	≤ 1.5	≤ 1.5
Apparent Porosity (%)	≤ 16	≤ 16	≤ 16	≤ 16	≤ 18	≤ 16
Cold Crushing Strength (MPa)	≥ 40	≥ 40	≥ 40	≥ 40	≥ 40	≥ 40
Refractoriness Under Load (°C)	≥ 1700 (0.2 MPa)	≥ 1700 (0.2 MPa)	≥ 1700 (0.2 MPa)	≥ 1700 (0.2 MPa)	≥ 1700 (0.2 MPa)	≥ 1700 (0.2 MPa)
Main Application	Circulation tubes, bottom grooves and other erosion serious parts	Dipping tube, bottom through, central through, the upper through and so on			Upper tube, hypo-working lining

Note: Seven performance parameters specified: MgO content, Cr₂O₃ content, SiO₂ content, Apparent Porosity, Cold Crushing Strength, Refractoriness Under Load, and Main Application. Six MCr chemistry grades engineered for RH degasser and secondary refining ladle lining service. For project-specific chemistry and geometry, contact CH Refractories engineering.

Product Applications

Magnesia Chrome Brick is a high-performance refractory brick manufactured from sintered magnesia and chromite as the main raw materials with high-temperature sintering process, engineered for RH degasser and secondary refining ladle lining service. The product family shows high refractoriness, excellent thermal shock resistance, and good slag erosion resistance, with three bonding types available: fused re-bonded, fused semi re-bonded, and direct-bonded MgO-Cr₂O₃ bricks.

Application Industry: Refractories for the Steel Industry and the broader Metallurgical Industry.

Target Equipment: RH Degasser Lining and Secondary Refining Ladle Lining of small, medium-size, and large ladles in steelmaking secondary refining operations.

Specific Application Zones: The CH-MCr-D26 grade (fused re-bonded MgO-Cr₂O₃, MgO content minimum 53%, Cr₂O₃ content minimum 26%) is the high-chrome workhorse for circulation tubes, bottom groove, and other erosion-serious parts where demanding slag attack and thermal cycling conditions exist. The CH-MCr-D20A grade (fused semi re-bonded MgO-Cr₂O₃, MgO content minimum 50%, Cr₂O₃ content minimum 20%) is for dip tubes, bottom through, central through, and upper through positions. The CH-MCr-B20A grade (fused semi re-bonded MgO-Cr₂O₃, MgO content minimum 50%, Cr₂O₃ content minimum 20%) is for upper through and similar positions. The CH-MCr-B16A grade (direct-bonded MgO-Cr₂O₃, MgO content minimum 55%, Cr₂O₃ content minimum 16%) is for upper tube and hypo-working lining positions. The CH-MCr-Z8A grade (direct-bonded MgO-Cr₂O₃, MgO content minimum 65%, Cr₂O₃ content minimum 8%) is the high-magnesia variant for secondary working lining service. All five grades deliver Apparent Porosity maximum 18%, Cold Crushing Strength minimum 40 MPa, and Refractoriness Under Load minimum 1700 °C at 0.2 MPa.

CH Refractories is a Magnesia Chrome Brick manufacturer in China, Henan, Zhengzhou. The complete Magnesia Chrome Brick product family is manufactured in our Xinmi City, Zhengzhou, Henan, China facility to ASTM, GB/T, and ISO refractory standards. Each batch is supported by free consultation, on-site technical support, and a dedicated engineering team serving Refractories for the Steel Industry customers across the global iron and steel value chain.

Product FAQ

Q1: What is magnesia chrome brick and what are the main applications?

A1: Magnesia Chrome Brick is a high-performance refractory brick engineered for RH degasser and secondary refining ladle lining service. The product family is manufactured from sintered magnesia and chromite as the main raw materials with high-temperature sintering process. The product family is offered in three bonding types: fused re-bonded MgO-Cr₂O₃ bricks, fused semi re-bonded MgO-Cr₂O₃ bricks, and direct-bonded MgO-Cr₂O₃ bricks. The product family shows high refractoriness, excellent thermal shock resistance, and good slag erosion resistance. The product is widely used in RH degasser and secondary refining ladle lining service for steelmaking secondary refining operations, including circulation tubes, bottom groove, dip tubes, bottom through, central through, upper through, upper tube, and hypo-working lining positions.

Q2: How many chemistry grades of magnesia chrome brick does CH Refractories offer?

A2: CH Refractories offers five engineering-proven MCr chemistry grades of Magnesia Chrome Brick. The CH-MCr-D26 grade (fused re-bonded) features MgO content minimum 53% and Cr₂O₃ content minimum 26% for circulation tubes and bottom groove. The CH-MCr-D20A grade (fused semi re-bonded) features MgO content minimum 50% and Cr₂O₃ content minimum 20% for dip tubes and bottom through positions. The CH-MCr-B20A grade (fused semi re-bonded) features MgO content minimum 50% and Cr₂O₃ content minimum 20% for upper through and similar positions. The CH-MCr-B16A grade (direct-bonded) features MgO content minimum 55% and Cr₂O₃ content minimum 16% for upper tube and hypo-working lining. The CH-MCr-Z8A grade (direct-bonded) features MgO content minimum 65% and Cr₂O₃ content minimum 8% for secondary working lining. All five grades deliver SiO₂ content maximum 1.5%, Apparent Porosity maximum 18%, Cold Crushing Strength minimum 40 MPa, and Refractoriness Under Load minimum 1700 °C at 0.2 MPa.

Q3: What are the key physical properties of magnesia chrome brick?

A3: Magnesia Chrome Brick delivers SiO₂ content maximum 1.5% across all five grades. Apparent Porosity reaches maximum 16% for CH-MCr-D26, CH-MCr-D20A, CH-MCr-B20A, and CH-MCr-Z8A grades, and maximum 18% for CH-MCr-B16A grade. Cold Crushing Strength is minimum 40 MPa for all five grades. Refractoriness Under Load is minimum 1700 °C at 0.2 MPa for all five grades. The CH-MCr-D26 grade has the highest chrome content (Cr₂O₃ minimum 26%) for the most demanding erosion parts, while the CH-MCr-Z8A grade has the lowest chrome content (Cr₂O₃ minimum 8%) but highest MgO content (minimum 65%) for secondary working lining service.

Q4: Can the magnesia chrome brick be customized to specific RH degasser and ladle designs?

A4: Yes. CH Refractories offers custom chemistry, geometry, and bonding type optimization against the buyer's specific RH degasser design, ladle lining layout, and secondary refining operating conditions. CH Refractories engineers can adjust MgO content, Cr₂O₃ content, SiO₂ content, and bonding type to meet specific slag chemistry and thermal cycling conditions. Please send the RH degasser drawing, ladle capacity, slag chemistry profile, and operating temperature data to our engineering team in Xinmi City, Zhengzhou, Henan, China for a free consultation, on-site technical support, and a tailored magnesia chrome brick formulation proposal with optimized grade selection, bonding type adjustment, and geometry design for your specific RH degasser and ladle service conditions.