N—1

N—2a

N—2b

N—3a

N—3b

N—4

N—5

N—6

CN

Refractoriness（Cone No.CN）

≥

176

174

174

172

172

170

166

158

0.2MPa ℃

0.2MPaRUL ℃

0.2MPa refractoriness under load ℃

≥

1400

1350

—

1320

—

1300

—

—

%

PLC %

Reburning line

change (%)

1400℃ ×2h

+0.1 ~

-0.4

+0.1 ~

-0.5

+0.2 ~

-0.5

—

—

—

—

—

1350℃ ×2h

—

—

—

+0.2 ～ -0.5

—

%

AP %

Apparent porosity %

≤

22

24

26

24

26

24

26

28

MPa

CCS MPa

Cold compressive strength MPa

≥

30

25

20

20

15

20

15

15