Electric Arc Furnace Refractory Selection By Zone

EAF Subhearth Recommended Refractories

The sub hearth zone of most electric arc furnaces are zoned in one of three ways;

1. somewhat unusual but still used in some shops is the all brick hearth concept. This design uses refractory brick that is horizontal to achieve an elevation for the beginning of the stadium portion of the lining.
2. the second concept used today is that of laying 9 x 11  straights flat on the shell in several layers and then covering with dry vibratible. 
3. the third concept is simply placing dry vibratible directly on the shell

Recommended Subhearth Refractory

• PERECON- a cost-effective, burned regular purity MgO composition that has good hydration resistance.
• OXILINE H- a burned, high purity MgO composition that has a balanced lime/silica ratio that imparts excellent refractoriness and excellent strength across a wide temperature range.
• OXILINE B- same as OXILINE H , but tar-impregnated, to enhance composition by adding carbon to existing porosity to provide greater slag resistance as well as enhancing hydration resistance.
  
  

EAF Stadium Recommended Refractories

The stadium area is designed to provide a safety lining for the dry vibratible.

• PERECON- a cost-effective, burned regular purity MgO composition that has good hydration resistance.
• OXILINE H- a burned, high purity MgO composition that has a balanced lime/silica ratio that imparts excellent refractoriness and excellent strength across a wide temperature range.
• OXILINE B- same as OXLINE H, but tar-impregnated, to enhance composition by adding carbon to existing porosity to provide greater slag resistance as well as enhancing hydration resistance.
  
  

EAF LOWER SIDEWALLS Recommended Refractories

This is the area of the furnace that makes the transition from the stadium to the sidewall. Generally, it is an area using a single brick length and is either of OXILINE B or mag-carbon in terms of composition. Slag or metal contact is possible but maintenance should prevent this.

NON-SEVERE to MODERATELY SEVERE APPLICATION 

• OXILINE B- same as OXLINE H, but tar-impregnated, to enhance composition by adding carbon to existing porosity to provide greater slag resistance as well as enhancing hydration resistance.
• NULINE R 10 SA or R 20 SA-  the addition of dual metals to provide oxidation resistance if needed.

SEVERE APPLICATIONS

• NULINE 10-99- a resin-bonded magnesia carbon brick composition that contains 100% fused very high purity MgO grain as well as dual metal additions.
• NULINE 13 DF- a brick similar to Nuline 10-99 but using higher purity raw materials.
  
  

EAF Upper Sidewalls Cold & Hot Spots Recommended Refractories

NON - SEVERE APPLICATIONS

• NULINE R10SA- a cost-effective resin-bonded, sintered MgO compositions containing 10% graphite respectively and dual metals that provide good all-around refractoriness.
• NULINE 10-99- a 100% fused MgO composition, dual metals to provide oxidation resistance if needed.

MODERATELY SEVERE

• NULINE 13 DF - a resin-bonded mag-carbon composition that contains 100% fused high purity fused MgO grain and dual metallics

MOST SEVERE APPLICATIONS

• NULINE 13 DF TL0853- a resin-bonded mag-carbon composition that contains 100% very high purity fused MgO grain and very high purity graphite. Dual metals are used to enhance oxidance resistance while providing resistance to aluminum carbide hydration.
• NULINE 15 DFP- a composition similar to Nuline 13 DF but enhanced metals to provide greater oxidation and hydration resistance.
• NULINE 20 DFP- a composition similar to Nuline 13 DF TL0945  but with higher graphite content to provide the greater nonwetting capability to slag attack.
  
  
  

EAF TAPHOLE Recommended Refractories

Tapholes epoxied & drilled for standard side assemble tapping are available in a range of compositions from fused grain mag-chrome to burned magnesite tar-impregnated, to mag- carbon of many types. SPOUTS Precast spouts for sidestepping furnaces can be cast in any number of materials with the following representing the typical choices;

NON-SEVERE APPLICATIONS

• Uniform 80CLC 102- an 80% alumina, 3200 F degree low cement castable designed to yield minimum porosity and very good strengths.

MODERATELY SEVERE APPLICATIONS

• Uniform 85LC - an 85% alumina, 3200 F ultra-low cement castable designed for maximum slag and metal resistance.

SEVERE APPLICATIONS

• Uniform 98LCXC - a high purity, low cement, 3400 F alumina - castable to provide maximum to molten steel and slags.
  
  

EAF DELTAS Recommended Refractories

NON-SEVERE APPLICATIONS

• Uniform 80CLC 102- an 80% alumina, 3200 F degree low cement castable designed to yield minimum porosity and very good strengths.

MODERATELY SEVERE APPLICATIONS

• Uniform 85LC - an 85% alumina, 3200 F ultra-low cement castable designed for maximum slag and metal resistance.

SEVERE APPLICATIONS

• Uniform 98LCXC - a high purity, low cement, 3400 F alumina - castable to provide maximum to molten steel and slags.

EAF SLAGLINE Recommended Refractories

This is the area of the furnace that sees the slag produced in the melting process. Based upon slag volumes and slag control this furnace zone can be no problem or a severe problem.

NON-SEVERE to MODERATELY SEVERE APPLICATION

• OXILINE B- same as OXLINE H, but tar-impregnated, to enhance composition by adding carbon to existing porosity to provide greater slag resistance as well as enhancing hydration resistance.
• NULINE R10SA or R 20 SA- same as the above-mentioned compositions except for the addition of dual metals to provide oxidation resistance if needed.

MODERATELY SEVERE

• NULINE 10-99- a resin-bonded mag-carbon composition that contains 100% fused very high purity MgO grain as well as dual metal additions.
• NULINE 13 DF- a brick similar to Nuline 10-99 but using higher purity raw materials.

MOST SEVERE APPLICATIONS

• NULINE 13 DF TL0853- a resin-bonded mag-carbon composition that contains 100% very high purity fused MgO grain and very high purity graphite. Dual metals are used to enhance oxidance resistance while providing resistance to aluminum carbide hydration.
• NULINE 15 DF -  a composition similar to Nuline 13 DF but enhanced metals to provide greater oxidation and hydration resistance.
• NULINE 20 DFP TL0945- a composition similar to Nuline 13 DF but with higher graphite content to provide the greater nonwetting capability to slag attack.

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