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Tartan Bars®

Scot Forge Tartan Bars

Tartan Bars® are a unique round bar product offered only by Scot Forge. These bars, offered in ferrous and non-ferrous materials, are available in custom sizes from 6" to 16" diameter and lengths up to 35'. They feature forged sound centers with rolled bar surface quality and tight dimensional tolerances.

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, Tartan Bars® can be purchased in quantities as small as the product of one ingot.

Tartan Bars® versus rolled bars

  • Rapid delivery—turnaround in 2-4 weeks (breakdowns even quicker)
  • Custom sizes—6" to 16" in ferrous and non-ferrous grades
  • High or low quantities—so you have better control over your inventory levels
  • Competitive prices—due to the efficiency of our process
  • Elimination of rejections—due to high-strength forged sound centers
  • A perfect solution to meeting your breakdown or just-in-time customer requirements
  • Improved straightness—1/8" in any 5' is standard; 1/16" in any 5' is available
Tartan Bars® Rolled Bars
Guaranteed sound centers Yes No
Custom sizes Yes No
Standard straightness 1/8" in any 5' 1/4" in any 5'
Special straightness 1/16" in any 5' 1/8" in any 5'
Typical lead time 2 to 4 weeks 2 to 4 months

Process highlights

As stated above, 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. The rolling/planishing mill equipment used in the process includes:

  • GFM horizontal rolling mill stand CCR 830 HP
  • Braun hot abrasive cut-off saw
  • Automated stamping system
  • Cooling bed

1. Tip up/box furnace with hot ingots

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.

2. Press forging

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.

3. Rolling to finish on the bar mill

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.

4. Hot abrasive cut-off saw

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.

5. Automated end stamping

Bars are end-stamped for traceability by an automated programmable marking system.

6. Slow cooling bed

Bars are slowly rotated down an automatic uniform cooling bed to maintain straightness.

7. Thermal treatment (optional)

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.

8. Bar peeler (optional)

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.

9. Automated ultrasonic testing (optional)

Ultrasonic inspection can be performed on Tartan Bars® to assure a sound, quality product.

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