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Tartan Bars are a unique forged round bar offered only by Scot Forge. These round bars are available in ferrous and non-ferrous materials and custom sizes from 6" to 16" diameter with lengths up to 35'. They feature forged sound centers with rolled bar surface quality and tight dimensional tolerances, ideal for applications with harsh environments, such as aerospace, nuclear, oil and gas, mining and infrastructure.
Tartan Bars are produced by combining a preliminary forging process, which consolidates the center, with a planishing operation, which provides a smooth-rolled bar surface. At the heart of the operation is our custom-designed, computer-controlled GFM single-stand planishing mill. Through a series of reversing passes, the planishing mill rolls the bar to a smooth surface in less than 5 minutes.
While still hot, the bar moves down the GFM mill to the Braun abrasive saw station for trimming. A 16’ round can be cut in less than half a minute. To complete the process, the bar is end-stamped for traceability by an automated programmable marking system. The bar is then slowly rotated down an automatic uniform cooling bed to maintain straightness.
Since the bars can be produced so efficiently in the planishing mill, delivery times are reduced. Unlike traditional hot-rolled bars, which can only be manufactured in large runs, forged Tartan Round Bars can be purchased in quantities as small as the product of one ingot.
As stated above, Tartan Round Bars are produced by combining a preliminary forging process, which consolidates the center, with a planishing operation, which provides a smooth-rolled bar surface. The rolling/planishing mill equipment used in the process includes:
Carbon, alloy, stainless steel, copper-based, and other ferrous and non-ferrous high-quality starting material are heated to forging temperature in car tip up/box furnace.
Hydraulic open die presses (3,000, 2,000 or 1,250 ton) forge the heated material to both consolidate the center for soundness and size the material in preparation for bar mill processing.
Finish rolling (or planishing) begins as the forged bar goes through one of the four hyperbolic grooves of the custom-engineered GFM bar mill. The desired final dimension is reached after a series of bar rotations and reversing passes through the grooves, taking less than 3 minutes to complete.
While still hot, bars are cut to size by a Braun abrasive saw. A 16" round can be cut in less than half a minute.
Bars are end-stamped for traceability by an automated programmable marking system.
Bars are slowly rotated down an automatic uniform cooling bed to maintain straightness.
A 50,000 gallon quench tank and nine tip up furnaces have been custom-designed to efficiently handle any bar requirement. Process options include normalize, anneal, solution anneal, quench and temper, and stress relieve.
A custom-built Hetran bar peeler provides fast, centerless machining to extremely smooth surfaces. This peeling process takes less than one-fourth the time of conventional turning operations.
Ultrasonic inspection can be performed on Tartan Bars® to assure a sound, quality product.