Mill Roll classification summary

1. Classification of pressed metal types

• Rolling steel products are called black rolls.
• Rolling non-ferrous metal materials (copper, aluminum, etc.) products are called non-ferrous rolls.

2. According to the temperature of the rolled material when it is rolled

• The rolling temperature higher than the recrystallization temperature of the rolled material is called hot rolling, and the corresponding roll is called hot rolling.
• The rolling temperature lower than the recrystallization temperature of the rolled material is called cold rolling, and the corresponding roll is called cold rolling.

3. Classification according to the shape of rolled products

The hot-rolled strip products are called hot strip rolls, and so on, there are: cold strip rolls, sheet steel rolls, section steel rolls, seamless steel pipe rolls, bar and wire rolls, etc.

4. Classification according to the function or location of the rolling mill on the rolling line

• The ones used in the blooming mill are called blooming rolls, and so on, there are rough rolling rolls, intermediate rolling rolls, pre-finishing rolls, finishing rolls,
• Pre-finishing rolls, back-end rolls, cross-cut smoothing rolls, slitting smoothing rolls, slitting rolls, vertical rolls, edge rolls, piercing rolls, tube rolling rolls, de-piping rolls, tension reducing rolls, straightening Roller etc.

5. Classification according to the position of the roll on the rolling mill

• The rolls that are in direct contact with the rolled material are called work rolls.
• The rolls that support the rolling mill are called backup rolls, and the rolls in the multi-roll mill that are farthest from the work rolls are called backup rolls.
• In a multi-roll mill, the rolls between the work rolls and the backup rolls are called intermediate rolls.

6. Classification by roll material

According to the classification of materials, the rolls are divided into four categories: cast steel rolls, cast iron rolls, forged steel rolls and powder metallurgy rolls.

7. Classification by blank manufacturing method

• Integral roll (also called conventional casting roll)
• Lamination rolls (flush lamination, centrifugal lamination, CPC lamination, jet deposition lamination, etc.). in:
• The roll manufactured by the full-flush composite method of flushing the overflowing liquid metal from the core is called a full-flush roll;
• Only the liquid metal in the core of the roll body is flushed to the upper roll neck, which is called a semi-flushing roll;
• The composite roll manufactured by centrifugal composite casting method is called centrifugal composite roll;
• Composite rolls manufactured by CPC (Continuous Composite Casting) method are called CPC composite rolls.
• Mechanical combination roll
• Rolls manufactured by mechanical combination are called combined rolls.
• A roll made by mechanical combination and applying a certain pressure in the axial direction is called a prestressed roll.

8. According to the size of the roller body

• Rolls are divided into large rolls and small rolls according to the size of the roll body.
• Cast steel rolls – those with a diameter of the roll body ≤ 500mm are called small steel rolls
• Cast iron rolls – those with a diameter of the roll body ≤540mm are called small iron rolls
• Forged steel rolls – those with roll body diameter ≤ 300mm are called small chill rolls
• Roll ring – net weight ≤ 1 ton, maximum diameter ≤ 1150mm is called casting small roll ring