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Mill Rolls

INQUIRY EMAIL

Main tool used in rolling mill which can be 2-Hi, 3-Hi, 4-hi or multi-user configuration .

Product Category ：

Mill Type

Stands

Material of mill rolls

Roll Code

Chemistry Range

Hardness （HS）

Strength

Barrel

Neck

Common wire mills, and high-speed wire mills

Break Down Stands

Alloy Cast Steel

AS70II

0.65/0.75

0.2/0.45

38-45

≤45

≥680

Roughing Stands

Adamite

AD140I

1.3/1.5

0.8/1.2

0.5/1.2

0.2/0.6

40-48

≤45

≥500

SGP-I

2.9/3.6

0.1/0.6

1.0/2.0

0.2/0.8

45/55

35/55

≥320

Ni-Cr-Mo ductile indefinite chilled-I

SGIV

2.9/3.6

0.2/0.6

0.5/1.0

0.2/0.8

45/55

35/55

≥320

Intermediate stands for common wires

Ni-Cr-Mo ductile indefinite chilled-II

SGV

2.9/3.6

0.3/1.2

1.01/2.0

0.2/0.8

55/65

35/55

≥320

Intermediate stands for common wires and high speed wires

SGP-II

2.9/3.6

0.2/1.0

1.5/2.5

0.2/0.8

55/65

35/55

≥320

Ni-Cr-Mo indefinite chilled-II (double poured)

IC-II

2.9/3.6

0.7/1.2

1.01/2.0

0.2/0.6

55-65

35/55

≥350

Finishing stands for common wires

ICDP-IV (High Ni-Cr)

ICIV

2.9/3.6

1.0/2.0

3.01/4.5

0.2/1.0

70/80

35/50

≥350

Rolls or rings for high speed wires pre-finishing stands

ICDP-IV (High Ni-Cr indefinite chilled double poured)

ICIV

2.9/3.6

1.0/2.0

3.01/4.5

0.2/1.0

70/80

35/50

≥350

Enhanced high wear-resistance roll rings

0.8/2.2

2.0/9.0

0.1/2.0

1.0/10.0

75-85

Rings for high speed wires finishing stands

Tungsten carbide

Bar mills

Break down stand

Alloy cast steel

AS70-II

0.65/0.75

0.2/0.45

38/45

≤45

≥680

Roughing stands

BGK-1

AD140- I

1.3/1.5

0.8/1.2

0.5/1.2

0.2/0.6

40/50

≤45

≥500

SGP-1

SGP-I

2.9/3.6

0.1/0.6

1.0/2.0

0.2/0.8

45/55

35/55

≥320

Intermediate Stands

Ni-Cr-Mo indefinite chilled-II (double poured)

SGV

2.9/3.6

0.3/1.2

1.01/2.0

0.2/0.8

60/70

35/55

≥350

SGP-II (double poured)

SGP-II

2.9/3.6

0.2/1.0

1.5/2.5

0.2/0.8

55/65

35/55

≥320

Finishing stand

Bainite ductile double poured-I

SGA-I

2.9/3.6

0.2/1.0

3.01/4.0

0.5/1.0

68/75

35/50

≥350

Large-sized bar mills

Break Down Stands

Forged steel

0.55/0.65

0.8/1.2

≤0.25

0.2/0.3

35/45

Alloy cast steel

AS70-II

0.65/0.75

0.2/0.45

38-45

≤45

≥680

AS75

0.70/0.80

0.75/1.0

0.2/0.45

35/45

≤45

≥680

BGK-I

AD140-I

1.3/1.5

0.8/1.2

0.5/1.2

0.2/0.6

40/48

≤45

≥500

Intermediate stands

SGP-II

2.9/3.6

0.2/1.0

1.5/2.5

0.2/0.8

60/65

35/50

≥350

Bainite ductile double poured-I

SGA-I

2.9/3.6

0.2/1.0

3.01/4.0

0.5/1.0

65/73

35/50

≥350

ICDP-IV (High Ni-Cr indefinite chilled double poured)

ICIV

2.9/3.6

1.0/2.0

3.01/4.8

0.2/1.0

65/73

35/50

≥350

Finishing stands

Bainite ductile double poured-I

SGA-I

2.9/3.6

0.2/1.0

3.01/4.0

0.5/1.0

68/75

35/50

≥350

ICDP-IV (High Ni-Cr indefinite chilled double poured)

ICIV

2.9/3.6

1.0/2.0

3.01/4.8

0.2/1.0

65/75

35/50

≥350

Roll or roll rings for Trimming mill

ICDP-IV (High Ni-Cr indefinite chilled double poured)

ICIV

2.9/3.6

1.0/2.0

3.01/4.8

0.2/1.0

70/80

35/50

≥350

Enhanced high wear-resistance roll rings

0.8/2.2

2.0/9.0

0.1/2.0

1.0/10.0

75-85

Section Mills

Break down stand

Alloy cast steel

AS70-II

0.65/0.75

0.2/0.45

35/45

≤45

≥680

Roughing mill

SGP-1

SGP-I

2.9/3.6

0.1/0.6

1.0/2.0

0.2/0.8

45/55

35/55

≥320

Intermediate Stands

SGP-II (double poured)

SGP-II

2.9/3.6

0.2/1.0

1.5/2.5

0.2/0.8

55/65

35/55

≥350

Ni-Cr-Mo indefinite chilled-II (double poured)

ICII

2.9/3.6

0.7/1.5

1.01/2.0

0.2/0.6

55/65

35/55

≥350

Finishing stand

SGP-II (double poured)

SGP-II

2.9/3.6

0.2/1.0

1.5/2.5

0.2/0.8

60/70

35/55

≥350

Ni-Cr-Mo indefinite chilled-II (double poured)

ICII

2.9/3.6

0.7/1.2

1.01/2.0

0.2/0.6

60/70

35/55

≥350

Straightening stand

SGP-II

2.9/3.6

0.2/1.0

1.5/2.5

0.2/0.8

55/65

35/55

≥320

Narrow strip mill, middle-broad strip mill

Vertical roll

SGP-II

2.9/3.6

0.2/1.0

1.5/2.5

0.2/0.8

55/65

35/55

≥350

2-Hi work roll

SGP-II

2.9/3.6

0.2/1.0

1.5/2.5

0.2/0.8

55/65

35/55

≥350

Back-up roll

Admite

AD160 I

1.5/1.7

0.8/2.0

≥0.20

0.2/0.6

50/60

≤50

≥490

4-Hi work roll

ICDP-IV (High Ni-Cr indefinite chilled double poured)

ICIV

2.9/3.6

1.0/2.0

3.01/4.5

0.2/1.0

75/83

35/50

≥350

High Chrome Iron double poured- I

HC-I

2.3/3.3

12.0/15.0

0.7/1.7

0.7/1.5

70/78

32/45

≥350

High Chrome Iron double poured- II

HC-II

2.3/3.3

15.01/18.0

0.7/1.7

0.7/1.5

70/78

32/45

≥350

Advanced New Materials of mill rolls

Work roll for bar and strip mills

High Speed Steel

HSS

1.5/2.2

3.0/12.0

0.00/1.5

2.0/8.0

75/85

30/45

≥350

Back-up roll for strip steel

High alloy steel back-up roll

0.3/1.0

2.0/5.5

0.3/1.2

0.4/1.5

50/60

≤50

≥680

2-Hi work roll for section mill

fatigue-resistance, high wear-resistance Roughing roll

0.3/1.0

2.0/8.0

0.3/1.2

0.1/2.0

50/60

≤50

≥680

Straightening and finishing stands for bar and wire mills

Enhanced wear-resistance roll rings

0.8/2.2

2.0/9.0

0.1/2.0

1.0/10.0

75/85

Centrifugal and Static Casting Non Continuous Carbide Bainite Roll and Ring

By adding many Ni, Mo alloy in the spheroidal cast iron, it can get very good pearlite, bainite and martensite matrix. While the graphite is spheroidal shaped, and has high heat conductivity, high tensile strength, so by changing the chemistry and heat treatment of bainite, martensite and Acicular matrix,it can get very dense net-shaped new cementite and increase the wear-resistance.

MECHANICAL PROPERTIES	Centrifugal	Static
Hardness of shell	HSD 50-80	HSD 45-70
Hardness of core	HSD 35-48	HSD 35-55
Tensile Strength of core	≥450MPa	≥300MPa

Chemical Analysis

C	Si	Mn	Ni	Cr	Mo
3.0/3.4	1.5/2.5	0.8/1.0	2.5/4.5	≤0.2	0.7/1.0

APPLICATIONS

For roughing rod/bar mills

Thanks to its higher content of Ni and Mo alloys, pearlite, bainite and martensite matrixes with excellent performance are produced. The graphite is in spherical form, good heat transfer property and high tensile strength. Through changing the structure into bainite and martensite matrix, chemical composition of accicular spherical iron of heat treatment, a dense reticular primary cementite with high wear-resistance is produced.

MECHANICAL PROPERTIES	Centrifugal	Static
Hardness of shell	HSD 50-80	HSD 45-70
Hardness of core	HSD 35-48	HSD 35-55
Tensile Strength of core	≥450MPa	≥300MPa

Chemical Analysis

Material	Hardness (HSD)	C	Si	Mn	Ni	Cr	Mo	Mg
SGP I	50-65	2.9/3.4	1.2/1.8	0.4/1.0	0.5/1.0	0.2/0.6	0.2/0.6	≥0.04
SGP II	50-70	2.9/3.4	1.2/1.8	0.4/1.0	1.0/3.0	0.2/1.2	0.2/0.6	≥0.04
SGA	60-80	3.0/3.5	1.2/1.8	0.4/1.0	3.0/4.5	0.2/1.2	0.6/1.0	≥0.04

APPLICATIONS

Various type of continuous rough ,intermediate and finish mills for processing bars, sections and strips. Used as the secondary finishing and back-up rolls. Also suitable for use on stainless-steel hot strip mills.

Its microstructure is composed of matrix and carbide with carbon content of 1.3-2.3%，depending on content of alloy and heat treatment process. The matrix consists of pearlite and bainite, with the addition of Cr, Mo and Ni for higher stability of carbide, enhanced high-temperature resistance and strengthened matrix, the roll has the special merits of being small in drop of hardness, highly wear and high-temperature resistant, and high in load bearing capacity feature etc.

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MECHANICAL PROPERTIES	Centrifugal	Static
Hardness of shell	HSD 40-60	HSD 40-60
Hardness of core	HSD 35-50	HSD 40-55
Tensile Strength of core	≥450MPa	≥420MPa

1.3/2.3

0.3/0.6

0.6/1.2

≥0.2

0.8/1.6

0.2/0.6

Mainly used for the front stand of section mill and hot strip mill, Also used for roughing and intermediate mill stand for wire and bar mills.

（4）Centrifugal Casting Alloy Indefinite Chilled Roll and Ring

The outer layer exhibits a remarkable mechanical performance, the quantity of graphite in the roll work layer remains basically unchanged along the depth, producing therefore no adverse effect on the decrease of hardness of work layer. The hardness of roll depends mainly on type of matrix (sorbite, bainite, martensite).



	MECHANICAL PROPERTIES
	Hardness of shell	HSD60-85
	Hardness of core	HSD35-48
	Tensile Strength of core	≥450MPa

Material	Hardness (HSD)	C	Si	Mn	Ni	Cr	Mo
Indefinite I	60-70	3.0/3.5	0.5/1.0	0.5/1.0	0.5/1.0	0.5/1.0	0.2/0.6
Indefinite II	62-72	3.0/3.5	0.5/1.0	0.5/1.0	1.0/2.0	0.5/1.0	0.2/0.6
Indefinite III	65-75	3.0/3.5	0.5/1.0	0.5/1.0	2.0/3.0	0.7/1.2	0.2/0.6
Indefinite IV	70-80	3.0/3.5	0.5/1.0	0.5/1.0	3.0/5.0	1.0/2.0	0.2/0.6

It is used in the finishing stands of tandem strip mills and tandem bar mills. Also used in pre-finishing stands of high speed wire mills, intermediate stand and early finishing stand of small section mills, it can also be used for thin plate and straigtening process.

（5）Centrifugal Casting Definite Chilled Cast Iron Roll and Ring

The rolls exhibit improved mechanical properties due to presence of chilled surface structure and the change of pinetree-like structure . The hardness and type of matrix of roll depend on conditions of application. The roll produced with centrifugal method basically eliminates the presence of graphite in its work layer while the core is made of nodular cast iron, increasing as a result, both the wear-resistance and break-resistance property.

MECHANICAL PROPERTIES
Hardness of shell	HSD65-85
Hardness of core	HSD35-48
Tensile Strength of core	≥450MPa

Material	Hardness (HSD)	C	Si	Mn	Ni	Cr	Mo
Chilled I	65-75	3.0/3.5	0.25/0.5	0.3/0.8	0.8/2.0	0.4/1.0	0.2/0.6
Chilled II	65-80	3.0/3.5	0.25/0.5	0.3/0.8	2.0/3.0	0.5/1.2	0.2/0.6
Chilled III	70-85	3.0/3.5	0.25/0.5	0.3/0.8	3.0/4.5	0.6/1.5	0.2/0.6

It is used for the final stands of wire, bar and small section, or used to roll light-duty material mills.

（6）Centrifugal Casting High Carbon Adamite Ring

Adamite is the kind of steel that with a carbon composition between steel and cast iron, it integrated strength and roughness of steel and high hardness and good wear resistance of cast iron. In order to enhance wear resistance of ring, its carbon content has been limited close to cast iron. The microstructure of the shell is made up of matrix (sorbite) and carbide. This kind of structure maintains almost constant hardness in depth and equal wear resistance throughout the shell, therefore, when making rolled pieces with large cross sections, can ensure uniformity of specifications across the product. In order to adapt to heavy workload, the inside part of the ring is made of graphite steel with high strength.



	MECHANICAL PROPERTIES
	Hardness of shell	HSD50-65
	Hardness of core	HSD38-48
	Tensile Strength of core	≥450MPa

Material	C	Si	Mn	Ni	Cr	Mo
AD180	1.7/1.9	0.3/0.8	0.6/1.1	0.5/2.0	0.8/1.5	0.2/0.6
AD190	1.8/2.0	0.3/0.8	0.8/1.2	1.0/2.0	1.5/3.5	0.2/0.6
AD200	1.9/2.1	0.3/0.8	0.8/1.2	0.6/2.5	0.6/2.0	0.3/0.8

Mainly used on horizontal roll stand and vertical roll stand of universal mill and H-beam mill

（7）.Centrifugal Casting High Speed Steel Roll and Ring

The outer layer is a complicated carbide structure of high-carbon steel alloys containing Cr,Mo,W,V,Ni and Nb, which is inlaid into the martensite structure. Through control of carbon control and comprehensive heat treatment process, the roll shows optimal wear and thermal fatigue resistant properties and surface of the oxide assumes a film structure. The residual stress is also reduced to a minimum.

MECHANICAL PROPERTIES
Hardness of shell	HSD75-85
Hardness of core	HSD35-48
Tensile Strength of core	≥450MPa

C	Si	Mn	Cr	Mo	W	V	Nb
1.6/2.3	0.3/0.9	0.2/0.8	3.0/6.0	3.0/6.0	1.0/4.0	2.0/6.0	1.0/3.0

Widely used as the F5 and F6 working rolls for hot strip mills. Also used in pre-finishing stand of high speed wire mills, and finishing stands of bar mills

（8）Centrifugal Casting High Chrome Iron Roll

Thanks to its high content of M7C3, type carbide in range of 20-30% and discontinuous network distribution of carbide, the roll offers a high wear resistance performance. The matrix is finely-distributed with secondary carbides (M7C3、M23C5 and M3C types), increasing therefore the wear resistance of roll, The Cr2O3 enriched oxide film on the roll surfaces is highly resistant to oxidization and plastic strain, making the roll extremely suitable for steel hot milling process.