Mill rolls are essential in the metal working industry. They are manufactured to an optimum hardness to resist wear and prevent marking. Forged steel roll is a type of rolling mill rolls. The roll has a microstructure which allows the surface finish to be resistant to thermal shock and a hardness depth prevent from rehardening in subsequent applications.
Firstly, we give some basic knowledge about the forged steel roll including the definition, types, feature, chemical composition, etc.
What Are Forged Steel Roll
Forge steel roll provides a mill roller solution for rolling mill. It is one of the most wear parts during the rolling process. It is mainly made of forged steel. It is forged in hydraulic presses for high toughness and pureness, widely used in cold rolling mill, steckel mills and continuous hot strip mills. As different rolling mills have specific requirements and various rolling conditions, different alloy elements can be added into the steel for higher performance of the roll. The roll covers forged steel work roll or intermediate roll, forged steel back up roll.
Forged Steel Roll
Definition
The forged steel rolls are made from steel ingots by forging, which can solve metallurgical defects such as loose and shrinkage holes in the ingot, and crush the coarse cast structure to obtain superior quality roll with high resistance.
The production process includes smelting, ingot casting, forging, post-forging heat treatment, rough processing, final heat treatment and finishing.
Feature
High Toughness
Surface Hardness Uniformity
Fatigue Resistance
High Hardness And Durability
Application
It is mainly used as strip rolling mill working roll and backup roll and is a high speed roll (HSS roll) for tandem and reversing cold reduction mills.
Forged Steel Back Up Roll
Definition
The forged back up roll is a mill roll that supports the work roll and intermediate roll for the purpose of avoiding deflection of the work roll and affecting on the yield and quality of the plate and strip rolling mill. This is the key function of back up roll to ensure the operation of the whole rolling mill. The common materials are 9Cr2Mo, 86CrMoV7, 70Cr3Mo with 0.80% to 0.95% carbon content 2% Cr content. The diameter of roll body ranges from 350mm-1600mm.
Feature
High Rigidity
The back up roll requires high rigidity to ensure the smallest deformation for supporting work roll.
Good Fatigue Resistance And High Peeling Resistance
The backup roll always need to support work roll or intermediate roll. Overloadig cause the subcutaneous miccrocrack propagation and roll body peeling off. So the excellent fatigue resistance is necessary.
High Surface Hardness With Good Hardness Uniformity
Outstanding surface hardness ensures the exceptional wear resistance and can reduce the formation of concave roll shape.
Excellent Yield Strength And High Toughness
To guarantee the long service life, the deep hardened layer of roll body, good strength and toughness of roll neck and roll body and strong anti-accidents are required.
Application
Forged steel back up roll is applicable for 4-Hi mill, 6-Hi mill, and other some small mill.
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