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MECHANICAL PROPERTIES OF SQUARE TUBE

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

SQUARE TUBE APPLICATIONS

Structural Steel Tube can be used for a wide variety of mechanical applications. It may be used either statically or dynamically. Is 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

HEAT TREATING OF SQUARE TUBE 

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 OF SQUARE TUBE

SQUARE TUBE OUTSIDE DIMENSIONS TOLERANCE 

* Tolerances include allowance for convexity or concavity. Tolerance may be increased 50% when applied to the smaller dimension of rectangular sections whose ratio if the cross-sectional dimensions is between 1.5 and 3, and 100 percent when the ratio exceeds 3.

WALL THICKNESS TOLERANCE
The tolerance for wall thickness exclusive of weld area shall be plus or minus 10% of the nominal wall thickness specified. The wall thickness is to be measured at the center of the flat.

STRAIGHTNESS TOLERANCE
The permissible variation for straightness shall be 1/8" times the number of feet of the total length divided by 5.

SQUARENESS OF SIDES
Adjacent sides may deviate from 90° by a tolerance of plus or minus 2° maximum.

RADIUS OF CORNERS
The radius of the outside corner of the section shall not exceed three times the specified wall athickness.

TWIST TOLERANCES
Twist is measured by holding down one end of square or rectangular tube on a flat surface plate with the bottom side of the tube parallel to the surface plate and noting the height that either corner, at the opposite end of the bottom side of the tube, extends above the surface plate.

Material and standard of square tube