1. Mill roll is the important parts, use a pair of group of pressure roller to rolling grinding steel rolling, it mainly under static loading of rolling wear and temperature changes.
2. Heat and cold roll of work rolling two kinds, common cold goll of work rolling materials have 9cr, 9cr2, 9crv8crMov. etc, the cold roll surface hardening, hardness requirement for HS45-105.
3. HOT roller materials are used 55cr, 60crMnMo, 60simnmo. etc, hot roller, use in plate and steel country, three. etc.
It is under the powerful rolling force, severe wear and therma fatigue and hot rolls. Temperature, and in the work within the workload units allowed in diameter, so don't wear hardness requirement only request with high strength and toughness and heat resistance. Hot roller is used only quenching, surface hardness requirement or HB190-270.