Project Indicators

GNHB

GNHL

GNHS

GNHD

AL2O3 %

≥ 65

≥ 60

≥ 57

≥ 53

Fe2O3 %

≤ 1.0

≤ 1.2

≤ 1.5

≤ 1.7

TiO2 %

≤ 0.5

≤ 0.5

≤ 0.6

≤ 0.6

K2O+Na2O ， %

≤ 0.6

≤ 0.6

≤ 0.6

≤ 0.6

Apparent
 porosity , %

≤ 20/22

≤ 20/22

≤ 20/22

≤ 20/22

bulk density
 ,g/cm3

≥ 2.50

≥ 2.45

≥ 2.40

≥ 2.35

Normal temperature
compressive
strength， MPa

≥ 60/55

≥ 50/50

≥ 50/45

≥ 50/45

0.2MPa load
softening
 start temperature ℃

≥ 1680

≥ 1650

≥ 1600

≥ 1550

Change rate of
reheating line (%) 

1500 ℃
× 4h

± 0.2

1500 ℃
× 4h

± 0.2

1400 ℃
× 4h

± 0.2

1400 ℃
 × 4h

± 0.2

Creep rate
(0.20MPa),%

1500 ℃
×
20-50h ≤ 0.2

1450 ℃
×
20-50h ≤ 0.2

1400 ℃
 ×
 20-50h ≤ 0.2

1350 ℃
×
 20-50h ≤ 0.2

Thermal shock
stability,
(1100 ℃ water cooling) times

≥ 20，25，30

≥ 20，25 30

≥ 20，25，30

≥20，25，30

Note: 1. Denominator in the table is the index of checker brick.
2. Thermal shock stability index can be adjusted according to user requirements