Both Cold Drawn Seamless Tube and Hot Finished Seamless steel tubes provide strength and durability, but the process used to create each type of tubing provides slightly different advantages. Deciding whether Cold Drawn Seamless or Hot Finish Seamless is best will depend on how you plan to use the tubing for your application.
Cold Drawn Seamless mechanical tubing is created by hot rolling SAE 1018 or SAE 1045/ST52 carbon steel, then drawing it at room temperature. During the drawing process, the pointed end of the tube is passed through a die. Force is used to stretch the steel into the desired thickness and shape and smooth the surface. This type of steel tubing meets ASTM A519 standards. It provides high yield strength, close tolerances and a smooth finish that is preferable for many mechanical applications.
Hot Finished Seamless mechanical tubing is produced using SEA 1026 carbon steel and is manufactured using the same extrusion process, only without the final step of drawing the tube at room temperature. The HFS process produces a steel tube that is easily machinable and is ideal for applications where a close dimensional tolerance or smooth surface finish is not required. HFS steel tubing meets ASTM A519 standards and is commonly used for applications requiring a thicker, heavier wall 4140 steel tubes and rods.
What Are the Different Applications for Seamless Round Steel Tubing?
Seamless steel tubing is used for various mechanical applications. The cold drawn seamless process creates a steel tube with tight tolerances and a smooth finish while HFS tubes have a rough finish with thicker walls. Both offer durability and good machinability, though CDS round steel tubes provide a higher strength-to-weight ratio.
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