| One of the questions Schupan Aluminum has been asked frequently is: What is the difference between Seamless and Structural Tubing? There are many things to keep in mind when considering different tubing options. This article will give you a better understanding of the similarities and differences between these two products and hopefully allow for a more informed decision with your particular application.
Tubing: Extruded or Drawn?
Extruded Structural Tube: This tube is produced by pushing metal through a die with tremendous force at elevated temperatures. The tube is actually "split" during the process and formed back together with high temperatures, pressure and a metallurgical weld that is inherent to the process. There is a slightly visible Seam that may be noticed to the naked eye if the tube is anodized or "finished." Although there is no difference in the chemical properties of the tube when compared to other tubes produced from the same alloy, it will not be guaranteed to transport liquid or gas with extreme pressure.
Typical Alloys include: 6061 (Other alloys available- Mill Minimum's would apply)
Extruded Seamless Tube: Extruded Seamless Tube is produced by pushing a "Hollow" billet through a die with tremendous force at elevated temperatures. This tube will not have a metallurgical weld or seam and is typically used for transporting gas, liquid, or other substances that involve pressure. The absence of a seam with this tube makes it ideal for anodizing and other "finishing" procedures.
Typical Alloys include: 6061 (Other alloys available- Mill Minimum's would apply)
Drawn Structural Tube: A drawn structural tube starts out with the same processing as the extruded structural tube. However, the difference is this tube will be brought to its final dimensions by "cold drawing" or "cold working" the product through an additional die. These tubes have tighter tolerances on the O.D., I.D., and Wall thickness. In general, these tubes consist of smaller diameters and thinner wall thicknesses.
Typical Alloys include: 6063, 3003 (Other alloys available- Mill Minimum's would apply)
Drawn Seamless Tube: A drawn seamless tube is produced in the same fashion as the extruded seamless tube. This tubing is then "cold drawn" or "cold worked" through an additional die to bring the product to its final dimensions. This type of tubing is generally used for transporting liquid, gas, or other substances that involve pressure. This tube would also be ideal for anodizing and other "finishing" procedures.
Typical Alloys include: 6061, 3003 (Other alloys available- Mill Minimum's would apply)
These tubing options were put in order from the least expensive option to the most. Schupan Aluminum stocks a full line of aluminum tubing and we look forward to servicing your needs!
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