There are 5 different types of carbon steel round tubes that have a variety of different applications which include architectural, furniture and machine parts. Carbon Steel Round Tubes are hollow metal cylinders that are measured by its outside diameter and the wall thickness and can be manufactured in the following ways:
Electric Resistance Welding (ERW)
Cold Drawn Seamless (CDS)
Drawn-Over-Mandrel (DOM)
Hydraulic
Hot Finished
Electric Resistance Welding (ERW)
Electric Resistance Welding requires cold forming metal coil to form it into round, cylindrical shapes. There are various ways to make the weld, however all welds are made through heating the joint via electrical resistance.
ERW tube is commonly welded using an automated process which results in a low manufacturing cost, and resistance welding typically allows for a high weld quality creating strong joins.
The uses for ERW pipe are wide ranging and include the manufacturing of axels and chassis in the automotive industry, general supports and stands, and internal machine components.
Cold Drawn Seamless (CDS)
Cold Drawn Seamless round tube is manufactured by piercing hot metal billets to create a tube that is then further rolled to elongate and reduce the diameter. The tubes are then cooled and refined to the required dimensions.
CDS tubing can have tight tolerances so the dimensions are accurate, they can have a thicker wall dimension allowing for a stronger tube and have an excellent aesthetic for the finished product.
CDS tubing can be used where the final product's aesthetic is important such as roll cages and shafts in the automotive industry. Further uses include high speed/high pressure pumping applications, hydraulic cylinders, and infrastructure columns.
Hot Finished
Hot Finished tubing is manufactured by piercing a solid piece of hot metal as it rotates creating a seamless tube. The tube is then passed through various mills to reduce the diameter and wall thickness.
Hot Finished tubes are versatile and easily machined while being a cost-effective option for metal tubing. Due to the nature of the hot piercing, tolerances are not as tight, and the finish is not as aesthetically pleasing as the other tubing types. Hot Finished tubes are typically only used where tolerances and finish are not the primary focus or where further machining is planned. Applications include construction equipment such as supports and drilling equipment, machined parts, rolls and pillars.
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