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Hot Blast Stove Clay Brick

August 08, 2018

Hot blast stove clay brick

Clay bricks for hot blast stoves are refractory products made of refractory clay and used to build hot blast stoves. Clay bricks for hot blast stoves are used in many parts such as furnace walls, partition walls and checkered bricks of hot blast stoves. Clay bricks for hot blast stoves are required to have good thermal shock resistance, high softening temperature and low creep.
 
YB/T5107-1993 divides the clay refractory bricks for hot blast stove into RN-42, RN-40 and RN-36 according to physical and chemical indicators. The physical and chemical indicators, dimensional tolerances and appearance are shown in Tables 1 and 2.
 
The standard for the section cracking of clay bricks for hot blast stoves is:
(1) When the layer split width is not more than 0.25 mm, the length is not limited;
(2) When the splitting width is 0.26~0.50mm, the length is not more than 30mm; 
(3) When the layer split width is greater than 0.50 mm, it is not allowed.
 
Table1 Physical and chemical properties of clay refractory bricks for hot blast stoves
 

 

Item

Index

RN-42

RN-40

RN-36

Al2O3   %                    ≥

≥42

≥40

≥36

Refractoriness (℃)

 

 

1750

1730

1690

0.2Mpa refractoriness under load  ℃ ≥

1400

1350

1300

 Reheat linear change 1450℃X3h    %

1450℃,2h

0-0.4

\

\

1350℃,2h

\

0-0.3

0-0.5

Apparent porosity%                ≤

≤24

≤24

≤26

Cold crushing strength   MPa      ≥

≥29.4

≥24.5

≥19.6

Resistance to themalshock times

This test must be carried out to indicate the measured data in the quality certificate.

 

Table2 Dimensional tolerance and appearance of clay refractory bricks for hot blast stoves

Item

Index

 

Dimensional tolerance

size≤230

±2

size231~350

±3

size351~450

±4

 

Distortion

length≤345

≤2

length>345

≤3

Lack of edge, lack of depth

≤6

Cave diameter

≤5

Slag thickness<1

Allowed on one side of the brick

 

Crack length

width≤0.25

not limited

width 0.26~0.50

≤50

width>0.50

Not allowed


 

 

 

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