Rolling Mill Rolls
Rolling Mill Rolls
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Product Details

Introduction


The rolling mill roll is mainly composed of a roll body, a roll neck, and a shaft head. The roll body is the middle part of the rolling mill roll that actually participates in the rolling of the metal. It has a smooth cylindrical or grooved surface. The roll neck is mounted in the bearing and the rolling force is transmitted to the frame through the bearing housing and the pressing device. The transmission end shaft head is connected to the gear base through the connecting shaft and transmits the rotational torque of the motor to the roller. The rolls can be arranged in the form of two rolls, three rolls, four rolls or multiple rolls in the rolling mill stand.


mill rolls

rolls



Rolling Mill Roll Types


There are many ways to classify rolls, including:

(1) According to product type, there are strip roll, section roll, and wire roll. 

(2) According to the position of rolls in the rolling mill series, there are blanking rolls, roughing rolls, finishing rolls, etc. (3) According to the roll function, there is scale breaking roll, piercing roll, flattening roll, etc. 

(4) According to the material of rolls, there are steel rolls, cast iron rolls, carbide rolls, ceramic rolls, etc. 

(5) According to the manufacturing method, there are casting roll, forging roll, surfacing roll, inlaid roll, etc. 

(6) According to the state of rolled steel, there are hot rolls and cold rolls. 

Various classifications can be combined to give a clearer meaning to rolls, such as centrifugally cast high chromium cast iron work rolls for hot strip rolling


The performance and quality of rolls are generally determined by their chemical composition and manufacturing methods and can be evaluated by their structure, physical and mechanical properties, as well as the types of residual stresses existing in the rolls (see Roll Inspection). The use effect of rolls in rolling mills depends not only on the material quality and metallurgical quality of rolls but also on the use conditions, roll design, operation, and maintenance. 


rolling mill rollsrolling mill roll



Parameter


There are great differences in roll service conditions of different types of rolling mills, which are caused by the following factors:

(1) Rolling mill conditions. Such as rolling mill type, rolling mill, and roll design, pass design, water cooling conditions, and bearing types, etc.

(2) Rolling conditions. Such as rolling varieties, specifications and deformation resistance, reduction system and temperature system, production requirements and operation, etc.

(3) Requirements for product quality and surface quality.


Material and Use Table of Common Rollers


Roll type

Roller body

Hardness HS

Roller neck tensile

Strength/MPa

Main uses

Casting

Steel

Rolling

Roll

Cast steel

Semi-steel

Graphite Steel

High chromium steel

Tool steel (high carbon)

High-Speed Steel

30~70

35-70

35-60

70-80

80-90

500~1000

300-700

500-900

Note

Note

Large and medium section billet and roughing mill stand, strip mill roughing mill stand, backup roll

Large, medium and small section steel intermediate and finishing mill stand, strip work roll

Large, medium and small section roughing mill 

stand

Strip roughing rear frame, finishing front frame, 

cold rolling strip work roll

Hot Strip Finishing Mill Stand, Small or Wire 

Finishing Mill Stand

Casting

Iron

Rolling

Roll

Chilled cast iron

Unbounded (Limited) Chilled Cast Iron

Ductile Iron

High chromium cast iron

Special cast iron

55~85

55-85

35-80

60-95

75-95

150~220

150-220

300-700

Note

Note

Finishing Mill Stand for Plate, Wire, Profile, and 

Tube

Medium-rolling and finishing mill stand for 

sheet, wire, profile, and pipe, and finishing mill 

stand for strip and plate

Rough and medium mill stand for profiles, wires, 

and pipes

Finishing mill stand for a small section and wire 

mill 

and strip pre-finishing mill stand

Precision rolling and finishing rolling of small, 

wire and pipe

Powder Metallurgy

Roll

Tungsten carbide

Tool steel

80~90

80-90

notes

Note

Small, wire rod finishing mill stand, cold rolled small steel

Small, wire finishing mill stand, strip finishing mill stand

Forging

Steel

Rolling

Roll

Hot roll

Cold roll

Backup roll

Forged semi-steel and white iron

35~60

75-105

40-70

35-70

500~1100

700-1400

700-1400

500-1000

Opening, large roughing mill stand, Plate 

Roughing mill stand

Cold rolled strip work roll, profile and welded 

pipe forming roll

Cold and Hot Strip Mill

Large, Medium and Small Rough, Medium and 

Finishing Mill Stands

 Note: Composite roll neck material is selected according to strength requirements.


Therefore, different types of rolling mills and rolling mills with different operating conditions have different requirements for the performance of the roll, such as square billet and slab blooming mill rolls with good torsional and bending strength, toughness, biting, thermal cracking resistance, thermal shock resistance and wear resistance. The hot strip finishing mill stand requires high hardness, indentation resistance, wear resistance, spalling resistance and heat cracking resistance of roll surface.


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