Main Data

See also

Refractories for open-hearth checkers

Refractories are intended for lining of open-hearth checkers and other thermal units.

Technical characteristics

 Rate for grade
  ShN-38 ShN-45
Spec. 1546-002-00190495-97 rev.1  Spec. 14-194-262-03

Mass fraction, %:

Al2O3, minimum

Fe2O3, maximum

 

38

-

 

45

3,5
Compressive strength, N/mm2, minimum 22 35
Open porosity, %, maximum 21 20
Residual variation of dimensions when heating, %, maximum at 1400 °С  0,4 0,4
Refractoriness, °С, minimum 1730 1750
Thermal shock resistance, heat cycles, minimum - 3
Temperature of initial deformation under load, °С, minimum 1400 1400

Limit deviations of refractory dimensions (mm)

Types and dimensions of itemsLimit deviations
  ShN-38 ShN-45
   Items of rectangular form:  
   length ±3 ±4
   width ±2 ±2
   heigth ±2
 ±2
   Shaped items:  
   up to 100 mm inc. ±2
 ±2
  over 100 up to 400 mm inc., % ±1,5 ±1,5

Form and dimensions


Straight brick GOST 8691-73 rev.1-4

Number of bricksDimensions, mmGroup of complication
  a b c  
2 230 65 85 3
5 230 65 114 1
8 250 65 124 1
9 300 65 150 2
10 345 75 150 3

 

End arch brick (one sided and double-sided) GOST 8691-73 rev.1-4
Number of bricksDimensions, mmGroup of complication
  a b b1 c  
20 230 75 65 114 4
22 230 65 55 114 3
23 230 65 45 114 4
25 250 65 55 124 3
29 300 65 55 150 4

T-type checker and unchecker brick GOST 6024-75 rev.1-3

Number of brickDimensions, mm
  a a1 b с d k r
39 230 150 114 75 40 25 5