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HOT STRETCH REDUCING (HSR)
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Induction
Heating
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Stretch
Reducing
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Cutting
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Cooling
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Prior to entering the HSR mill, tube shells are heated to approximately 2000ºF (1093.3ºC) by five in-line induction furnaces.
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The HSR mill consists of 20 roll stands of decreasing diameter. Each stand reduces tube diameter by approximately 5%. During this process,
the mill can also reduce, maintain, or increase wall thickness, resulting in a wide variety of diameter and wall combinations.
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Tubing is cut-to-length as it leaves the mill.
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After cooling, tubing may be shipped to the customer, sent to cold drawing, or subjected to any number of finishing operations.
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To begin the hot stretch reducing process, tube hollows are heated to approximately 2000 degrees Fahrenheit (1093.3 degrees Celsius)
by five induction furnaces before entering the Hot Stretch Reducing mill. The HSR mill consists of 20 roll stands, each containing three rolls,
a design that improves internal surface finish, maintains concentricity and improves dimensional accuracy. Each roll stand reduces tube
diameter by approximately five percent, with the final three stands providing the finish diameter. At the same time, by controlling
longitudinal tension between each stand, the mill can also reduce, maintain, or increase wall thickness. This unique combination of
process abilities produces a large range of diameters and diameter-wall combinations from relatively few shell sizes with maximum
efficiency and substantial economies of scale.
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