Structural Steel Square & Rectangular Tube

Produced by cold forming flat rolled steel into tubular shapes and electric-resistance welded into solid wall tubing. Controls during the cold forming to square or rectangular shapes prevent irregularities in structure or loss of physical properties across the weld area. Since it begins as a flat rolled product, the finished tube has a uniform wall thickness and equal strength throughout. It is easy to machine and fabricate, using all common machining and fabricating operations. It can be bent or drawn, flattened or flared, expanded or swaged, drilled or punched easily. It is easily mechanically joined or welded using all the commonly used practices. Because of ease of fabrication, and a surface suitable for painting or plating, Structural Steel Square and Rectangular tube has almost unlimited applications.

MECHANICAL PROPERTIES

Structural Steel Tubing conforms to ASTM A500. This specification covers cold formed welded and seamless carbon structural tubing respectively. Above are minimum mechanical properties.

APPLICATIONS

Structural Steel Tube can be used for a wide variety of mechanical applications. It may be used either statically or dynamically. I’s close tolerances, good finish, and dense structure make it ideal for parts such as structural support and parts, frames, racks, trailer beds and trailer components, structural components and supports for buildings, bridges, and highways, conveyors, machine parts, guides, and supports, safety and deck rails, sign posts, athletic equipment, ornamental usages and a wide range of applications in industrial, construction, automotive, appliance, furniture and agricultural industries

MACHINEABILITY AND WELDABILITY

Machinability is rated at 78% of B1112. Average cutting speed 130 ft/min. This grade is easily welded by all welding processes including gas, air, and submerges arc, and the resultant welds and joints are of extremely high quality. Preheat and post-weld heating is generally not necessary.

HEAT TREATING

Generally not applicable as structural steel tube is generally used in the "as supplied" condition and may be annealed or stress relieved. Annealing - May be annealed if necessary at 1600°F and slow furnace cooled. Hardens from cold working, although it will also respond to any carburizing method and subsequent heat treatments. Case hardening results in a hard case and relatively soft core. Carburize at 1650°-1700°, oil or water quench and temper at 300°. Carburizing depth is typically .060-.070".

TOLERANCES

SPEEDY METALS ITEMS