High Alumina Fire Bricks Description

High alumina bricks are fire bricks which contains more than 48% of Al2O3. Generally, high alumina bricks are classified into 3 classes. I  class high alumina bricks: ≥ 75% of Al2O3. II class high alumina bricks: 60%~75% of Al2O3, III class high alumina bricks: 48%-60% of Al2O3. High alumina bricks have higher rupture under load temperature than clay bricks, usually between 1420~1550℃, the higher the Al2O3 content is, the higher the URL is. High alumina bricks have good acidic slag or basic slag corrosion resistance, metal liquid corrosion resistance and oxidation or reduction resistance. High alumina bricks are widely used in blast furnace, hot blast furnace and electric furnace.

refractory brick

  1. Blast Furnace High Alumina Fire Bricks for Sale

High alumina bricks used in blast furnaces are those with 65%, 55% and 48% of alumina.

high alumina refractory brick

The physicochemical index of blast furnace high alumina bricks

ItemBFHA-65BFHA-55BFHA-48
Al2O3% ≥655548
Fe2O3 % ≤2.02.02.0
Refractoriness ℃≥179017701750
RUL 0.2 Mpa ℃ ≥150014801450
Reheating linear change(1500℃, 2h)0~-2(1500℃, 2h)0~-2(1450℃, 2h)0~-2
Apparent porosity%≤19≤19≤18
Cold compression strength Mpa ≥58.858.849.0

 

  1. Hot Blast Furnace High Alumina Refractory Bricks

High alumina bricks  for hot blast furnaces can be divided into ordinary high alumina bricks and low creep high alumina bricks.

low creep alumina fire brick

Low creep high alumina bricks physicochemical index

ItemLCA-155LCA-150LCA-145LCA-140LCA-135LCA-130
Al2O3% ≥757565656560
Bulk density2.65-2.852.65-2.852.50-2.702.40-2.602.35-2.552.30-2.50
Creep rate (0.2 Mpa, 50h) ≤1550℃

0.8

1500℃

0.8

1450℃

0.8

1400℃

0.8

1350℃

0.8

1300℃

0.8

Reheating linear change(1500℃, 2h)0.1~-0.2(1500℃, 2h)0.1~-0.2(1500℃, 2h)0.1~-0.2(1450℃, 2h)0.1~-0.2(1450℃, 2h)0.1~-0.4(1450℃, 2h)0.1~-0.4
Apparent porosity%≤202121222222
Cold compression strength Mpa ≥606060555555

  1. Steel Making Electric Furnace High Alumina Bricks

High alumina bricks used in electric furnaces for steelmaking are I class alumina bricks with high refractoriness, good mechanical strength and good corrosion resistance. High alumina bricks are usually used as furnace top bricks and skew bricks of electric furnaces.

low creep alumina fire brick

Electric furnace high alumina bricks physicochemical index

ItemEFA-80EFA-75EFAB-80EFAB-75
Al2O3% ≥80758075
Refractoriness ℃17801780
RUP temperature (0.2 Mpa) ℃≥1530152015301520
Reheating linear change (1500℃, 2h)0.2~-0.40.2~-0.4
Apparent porosity%≤Furnace top brick19191818
Skew brick21212020
Cold compression strength Mpa ≥7565605555
Thermal shock resistance(1100℃, water cooling)≥

88

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