The radius of the outside corner of the section shall not exceed three times The permissible variation for straightness shall be 1/8" times the number ofĪdjacent sides may deviate from 90° by a tolerance of plus or minus 2° The tolerance for wall thickness exclusive of weld area shall be plus or minusġ0% of the nominal wall thickness specified. Whose ratio if the cross-sectional dimensions is between 1.5 and 3, and 100 Increased 50% when applied to the smaller dimension of rectangular sections * Tolerances include allowance for convexity or concavity. OUTSIDE DIMENSIONS TOLERANCE Largest Outside Dimension Across Flats Carburize at 1650°-1700°, oil or water quench and temper at 300°. Case hardening results in a hard case and relatively soft core. Hardens from cold working, although it will also respond to any carburizing method and subsequent heat treatments. Generally not applicable as structural steel tube is generally used in the "as supplied" condition and may be annealed or stress relieved.Īnnealing - May be annealed if necessary at 1600☏ and slow furnace cooled. Preheat and post-weld heating is generally not necessary. 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. 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 It may be used either statically or dynamically. Structural Steel Tube can be used for a wide variety of mechanical applications. This specification covers cold formed welded and seamless carbon structural tubing respectively. Structural Steel Tubing conforms to ASTM A500. Because of ease of fabrication, and a surface suitable for painting or plating, Structural Steel Square and Rectangular tube has almost unlimited applications. It is easily mechanically joined or welded using all the commonly used practices. It can be bent or drawn, flattened or flared, expanded or swaged, drilled or punched easily. It is easy to machine and fabricate, using all common machining and fabricating operations. Since it begins as a flat rolled product, the finished tube has a uniform wall thickness and equal strength throughout. Controls during the cold forming to square or rectangular shapes prevent irregularities in structure or loss of physical properties across the weld area. Produced by cold forming flat rolled steel into tubular shapes and electric-resistance welded into solid wall tubing. Speedy Metals Information for Structural Steel Square & Rectangular Tube Structural Steel Square & Rectangular Tube Mechanical_Properties
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