Ac Acicular Rolls

Acicular softer grades have bainitic matrix, and hardest grades have bainitic-martensitic microstructure. Compared with pearlitic rolls, these rolls are higher alloyed and can reach a higher hardness. We can influence the hardness of acicular rolls by the graphite and carbide contents which we determine by chemical composition and melt inoculation. The intended bainitic – martensitic microstructure is obtained by different tempering processes too.

Because of their lower thermal conductivity and toughness, acicular rolls have a lower resistance against fire cracking compared to pearlitic rolls. Acicular rolls are stronger and more wear resistant compared to pearlitic rolls of the same hardness. The wear resistance increases with the increasing hardness. Heat treatment improves the resistance to fire cracking.

 PDF

 

     

AcH70CN-Acicular Matrix with Carbides and

Nodular Graphite(x500)

AcH62N-Bainitic Matrix with Carbides and

Nodular Graphite(x100)

 

Roll

Grade

Barrels

Hardness

(ShC)

C

(%)

Si

(%)

Mn

(%)

Cr

(%)

Ni

(%)

Mo

(%)

Tensile

Strength

(N/mm2)

Bending

Strength

(N/mm2)

Ac 42N

42

3.2-3.6

1.2-2.2

0.1-0.4

0-0.3

2.2-3.5

0.2-0.8

500-800

1100-1300

Ac 46N

46

3.2-3.6

1.2-2.2

0.1-0.4

0-0.3

2.2-3.5

0.2-0.8

500-800

1100-1300

Ac 50N

50

3.2-3.6

1.2-2.2

0.1-0.4

0.2-0.5

2.2-3.5

0.2-0.8

400-500

1100-1300

Ac H 54  N

54

3.2-3.6

1.2-2.0

0.1-0.4

0.2-0.8

2.4-3.8

0.2-0.8

400-500

1100-1300

Ac H 58 N

58

3.2-3.6

1.1-1.8

0.2-0.6

0.2-0.8

2.4-3.8

0.2-0.8

400-500

900-1100

Ac H 62 N

62

3.2-3.6

1.1-1.8

0.2-0.6

0.2-0.8

2.6-4.2

0.2-1

400-500

900-1100

Ac H 66 N

66

3.2-3.6

1.1-1.8

0.2-0.8

0.3-1.0

2.6-4.2

0.2-1

400-500

900-1100

Ac H 68 N

68

3.2-3.6

1.1-1.8

0.2-0.8

0.3-1.0

2.6-4.2

0.2-1

300-450

750-950

Ac H 70 N

70

3.2-3.6

1.0-1.8

0.2-0.8

0.4-1.2

0.4-1.2

0.2-1

300-450

750-950

Ac H 72 N

72

3.2-3.6

1.0-1.8

0.2-0.8

0.4-1.2

2.6-4.2

0.2-1

300-450

750-950

Ac H 60 CN

60

3.2-3.6

1.0-1.8

0.2-0.7

0.3-0.9

2.6-4.2

0.2-1

See core Material Info in link1

Ac H 62 CN

62

3.2-3.6

1.0-1.8

0.2-0.7

0.3-0.9

2.6-4.2

0.2-1

See core Material Info in link1

Ac H 64 CN

64

3.2-3.6

1.0-1.8

0.2-0.7

0.3-0.9

2.6-4.2

0.2-1

See core Material Info in link1

Ac H 66 CN

66

3.2-3.6

1.0-1.8

0.2-0.7

0.3-0.9

2.6-4.2

0.2-1

See core Material Info in link1

Ac H 68 CN

68

3.2-3.6

1.0-1.8

0.2-0.7

0.3-0.9

2.6-4.2

0.2-1

See core Material Info in link1

Ac H 70 CN

70

3.2-3.6

1.0-1.8

0.2-0.7

0.3-0.9

2.6-4.2

0.2-1

See core Material Info in link1

Ac H 72 CN

72

3.2-3.6

1.0-1.8

0.2-0.7

0.3-1.1

2.6-4.2

0.2-1

See core Material Info in link1

Ac H 74 CN

74

3.2-3.6

1.0-1.8

0.2-0.7

0.3-1.1

2.6-4.2

0.2-1

See core Material Info in link1

Ac H 76 CN

76

3.2-3.6

1.0-1.8

0.2-0.7

0.4-1.2

2.6-4.2

0.2-1

See core Material Info in link1

 

Note: On request, other roll grades not specified in the table can be produced. Cores for compound rolls can be produced with Grey, Compact or Nodular cast iron.