Acicular Nodular Iron (SGA) Rolls for Tube Mill

Product Description

We can provide the full ranges of rolls for the Bar & Wire mills, covering roughing rolls, intermediate rolls and finishing rolls.
Spheroidal graphite cast iron roll
Properties
Thanks to its higher content of Ni and Mo alloys, pearlite, basinite and martensite matrixes with excellent performance are produced. The graphite si spherical form, demonstraing good heat transfer property and high tensile strength. Through changing the struture into basinite of marensite matrix, chemical compostion of needly-like spherical iron of heat treatment, a dense reticular primary cementite with high wear-resistance is produced
Chemical Analysis

Designation of rolls	C	Si	Mn	P	S	Ni	Cr	Mo	Mg
CrMo semi-chilled SG cast iron rolls	2.9/3.6	0.8/2.5	0.4/1.2	≤0.25	≤0.03		0.2/0.6	0.2/0.6	>0.04
CrMo indefinite chilled SG cast iron rolls	2.9/3.6	0.8/2.5	0.4/1.2	≤0.25	≤0.03		0.2/0.6	0.2/0.6	>0.04
NiCrMo indefinite chilled SG cast iron rolls (I)	2.9/3.6	0.8/2.5	0.4/1.2	≤0.25	≤0.03	0.5/1.0	0.2/0.6	0.2/0.6	>0.04
NiCrMo indefinite chilled SG cast iron rolls (II)	2.9/3.6	0.8/2.5	0.4/1.2	≤0.25	≤0.03	1.0/2.0	0.3/1.2	0.2/0.8	>0.04
Pearlitic nodular cast iron rolls (I)	2.9/3.6	1.4/2.2	0.4/1.0	≤0.15	≤0.03	1.5/2.0	0.1/0.6	0.2/0.8	>0.04
Pearlitic nodular cast iron rolls (II)	2.9/3.6	1.2/2.0	0.4/1.0	≤0.15	≤0.03	2.0/2.5	0.2/1.0	0.2/0.8	>0.04
Pearlitic nodular cast iron rolls (III)	2.9/3.6	1.0/2.0	0.4/1.0	≤0.15	≤0.03	2.5/3.0	0.2/1.2	0.2/0.8	>0.04
bainitic nodular cast iron rolls (I)	2.9/3.6	1.2/2.2	0.2/0.8	≤0.10	≤0.03	3.0/3.5	0.2/1.0	0.5/1.0	>0.04
bainitic nodular cast iron rolls (II)	2.9/3.6	1.2/2.0	0.2/0.8	≤0.10	≤0.03	3.5/4.5	0.3/1.5	0.5/1.0	>0.04

Physical Properties

Designation of rolls	Barrel hardness (HSD)	Neck hardness (HSD)	Tensile strength (MPa)
CrMo semi-chilled SG cast iron rolls	40~55	32~50	>300
CrMo indefinite chilled SG cast iron rolls	55~70	35~55	>300
NiCrMo indefinite chilled SG cast iron rolls (I)	48~70	35~55	>320
NiCrMo indefinite chilled SG cast iron rolls (II)	48~70	35~55	>320
Pearlitic nodular cast iron rolls (I)	45~55	35~55	>450
Pearlitic nodular cast iron rolls (II)	55~65	35~55	>450
Pearlitic nodular cast iron rolls (III)	62~72	35~55	>450
bainitic nodular cast iron rolls (I)	55~78	32~45	>350
bainitic nodular cast iron rolls (II)	60~80	32~45	>350

Microstructure

Designation of rolls	Barrel hardness (HSD)	Neck hardness (HSD)	Tensile strength (MPa)
CrMo semi-chilled SG cast iron rolls	40~55	32~50	>300
CrMo indefinite chilled SG cast iron rolls	55~70	35~55	>300
NiCrMo indefinite chilled SG cast iron rolls (I)	48~70	35~55	>320
NiCrMo indefinite chilled SG cast iron rolls (II)	48~70	35~55	>320
Pearlitic nodular cast iron rolls (I)	45~55	35~55	>450
Pearlitic nodular cast iron rolls (II)	55~65	35~55	>450
Pearlitic nodular cast iron rolls (III)	62~72	35~55	>450
bainitic nodular cast iron rolls (I)	55~78	32~45	>350
bainitic nodular cast iron rolls (II)	60~80	32~45	>350

Application

Designation of rolls	Application
CrMo semi-chilled SG cast iron rolls	Section mill, bar mill, roughing stands of wire-rod mill, work roll of rail mill
CrMo indefinite chilled SG cast iron rolls	Section mill, bar mill, intermediate and finishing stands of wire-rod mill
NiCrMo indefinite chilled SG cast iron rolls (I)	Section mill, bar mill, intermediate and finishing stands of wire-rod mill
NiCrMo indefinite chilled SG cast iron rolls (II)	Section mill, bar mill, intermediate and finishing stands of wire-rod mill
Pearlitic nodular cast iron rolls (I)	roughing stands of bar mill and wire-rod mill
Pearlitic nodular cast iron rolls (II)	roughing stands of bar mill and wire-rod mill
Pearlitic nodular cast iron rolls (III)	roughing stands of bar mill and wire-rod mill
bainitic nodular cast iron rolls (I)	roughing stands of bar mill and wire-rod mill
bainitic nodular cast iron rolls (II)	roughing stands of bar mill and wire-rod mill

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