· If a mill rolls 80 % of the calendar year, that is 365 x 24 x = 7008 hours. If the mill rolls 800,000 tons per year, it runs at an average production rate of tons/hour. If the utilization can be improved by 1 %, the available rolling hours is 365 x 24 x =, creating extra rolling hours.
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Get Price· The halfproducts are then fed to cold reduction mills. The metal is rolled to the thickness of .3 mm in case of mild steel and .5 mm in case of stainless steel. The material is cooled by the use of oil which also acts as a lubricant during the rolling process. As the metal sheet gets thinner between the rolls, its speed increases.
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Get Price· Cold pilgering is a longitudinal coldrolling process that reduces the diameter and wall thickness of metal tube in one process step. Depending on the material, the cold pilger process achieves crosssection reductions of more than 90 percent in a single working cycle. Figure 1. The cold pilgering process relies on four main actions: The tube ...
Get Price· The differences between hot rolled steel and cold rolled steel relates to the way these metals are processed at the mill, and not the product specifiion or grade. Hot rolled steel involves rolling the steel at high temperatures, where cold rolled steel is processed further in cold reduction mills where the material is cooled followed by annealing and/or tempers rolling.
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