Material selection of common rolls

1. Choice of working roll material
Roughing front work roll (R1): roughing front work roll must have strong toughness, wear resistance and thermal crack resistance. The hardness range is about HS40-55. Generally use 60CrNiMo cast steel rolls.
Roughing after the work rolls (R2): roughing after the work rolls require the use of good heat cracking resistance material. Generally choose half steel, high chromium steel, high-speed steel and other materials.
Fine rolling front section work roll (F1-4): Fine rolling front section work roll has high temperature and high load. It is generally made of cast semi-steel and high-chromium centrifugal composite cast iron. High-chromium centrifugal composite cast iron has higher roll surface wear resistance and thermal crack resistance, and can suppress roll surface spotting defects.
Finishing rolls (F5-7): Finishing rolls are used in the final stage of rolling, which has a very important impact on product quality and surface condition. The roll performance needs are mainly high hardness, wear resistance, indentation resistance, spalling resistance and thermal cracking resistance, and generally choose infinite chilled cast iron (ordinary type, improved type) and other materials.

2. Selection of support roll and vertical roll material
Both the support rolls for roughing and finishing are required to have good thermal crack resistance, wear resistance, fatigue resistance and high strength. Generally, the materials used are compound cast steel, alloy forged steel (Cr3, Cr5), etc.

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