C

Si

Mn

Cr

Ni

Mo

V

Nb

P

S

Alloy

steel

AS651

0.6-0.7

0.2-0.6

0.5-0.8

0.8-1.2

0.2-0.5

0.2-0.45

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≤

0.035

≤0.03

Section mill, wire and re-bar roughing rolls; strip steel back up roll, vertical roll; section steel universal mill

AS70

0.65-0.75

0.2-0.45

0.9-1.2

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AS701

0.65-0.75

0.2-0.45

1.4-1.8

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AS7011

0.65-0.75

0.2-0.45

1.4-1.8

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0.2-0.45

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AS75

0.70-0.80

0.20-0.45

0.6-0.9

0.75-1.0

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0.2-0.45

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Billet roughing stand;section mill universal stand;hot mill strip steel roughing stand

AS751

0.70-0.80

0.2-0.7

0.7-1.1

0.8-1.5

≥0.2

0.2-0.6

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Cr3

0.20-0.50

0.2-0.7

0.5-1.3

2.4-3.5

≤0.8

0.3-0.6

0.05-0.20

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≤0.08

≤0.05

hot mill strip steel support roll,roughing roll;cold steel finishing and  back up roll

Cr5

0.30-0.55

0.2-0.7

0.3-1.1

4.7-5.4

≤0.5

0.5-0.85

0.50-0.85

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Roller surface hardness

Roll neck hardness

Alloy AS651

35-45

≤45

Alloy AS70

32-42

≤42

Alloy AS701

35-45

≤45

Alloy AS7011

35-45

≤45

Alloy AS75

35-45 or 40-50

≤45

Alloy AS751

35-45 or 40-50

≤45

Alloy Cr3

58-63

30-40

Alloy Cr5

68-73

30-40