Index

N-1

N-2a

Refractoriness SK

34

34

Refractoriness under load 0.2Mpa ℃

≥1400

≥1350

Permanent linear change 1400℃x2h%

+0.1~-0.4

+0.1~-0.5

Apparent Porosity %

≤22

≤24

Cold crushing strength Mpa

≥29.4

≥24.5

Chemical

composition

Al2O3 %

≥42

≥42

Fe2O3 %

≤2.0

Index

JN-40

JN-42Y

Refractoriness SK

34

34

Apparent porosity %

≤24

≤24

Bulk density Mpa

≥24.5

≥24.5

Refractoriness under load 0.2Mpa ℃

≥1350

≥1350

≤0.5

≤0.5

Resistance thermal shock1100℃water cooling times

≥10

Chemical

Composition

Al2O3 %

≥40

≥42

Fe2O3 %

Index

ZGN-42

GN-42

Refractoriness SK

34

34

Refractoriness under load 0.2Mpa ℃

≥1450

≥1430

+0.0~-0.2

+0.0~-0.3

Apparent porosity %

≤15

≤16

Cold crushing strength Mpa

≥58.8

≥49.0

Chemical Composition

Al₂O₃ %

≥42

≥42

Fe₂O₃ %

≤1.6

≤1.7

Index

RN-42

RN-40

RN-36

Refractoriness SK

34

34

33

1400

1350

1300

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

Chemical cmposition

Al₂O₃ %

≥42

≥40

≥36

FE2O3 %

Index

DN-20

DN-18

DN-15

Refractoriness ℃

≥1730

≥1750

≥1750

Cold crushing strength MPa

≥35

≥45

≥50

Refractoriness under load 0.2Mpa ℃

≥1350

≥1430

≥1450

Permanent linear change 1400℃×2h %

+0.1~-0.5

+0.1~-0.3

+0.1~-0.3

Apparent porosity %

≤20

≤18

≤15

Al₂O₃ %

≥ 40

≥ 42

≥ 42

Fe₂O₃ %

≤2.0

≤1.8

≤1.5

Index

NG-1.0

NG-0.9

NG-0.8

NG-0.7

NG-0.6

NG-0.5

NG-0.4

Bulk density g/cm³

≤1.0

≤0.9

≤0.8

≤0.7

≤0.6

≤0.5

≤0.4

Cold crushing strength kg/cm²

≥35

≥25

≥25

≥25

≥20

≥15

≥10

Permanent linear change temp.
less Than 2% ℃

≥1350

≥1300

≥1250

≥1250

≥1200

≥1150

≥1150

Thermal conductivity 350±25℃ W/m·k

≤0.5

≤0.4

≤0.35

≤0.35

≤0.25

≤0.25

≤0.20