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.

ANALYSIS

Carbon (C)Manganese (Mn)Phosphorus (P)

Max

Sulfur (S)

Max

0.08-0.230.03-0.060.040.05

MECHANICAL PROPERTIES

ConditionTensile Strength (PSI)Yield Strength (PSI)Elongation in 2"
Grade A45,00033,00025
Grade B58,00042,00023

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

OUTSIDE DIMENSIONS TOLERANCE

Largest Outside Dimension Across Flats Tolerance (+/-) inches*
2-1/2 and under 0.020
Over 2-1/2 to 3-1/2 incl 0.025
Over 3-1/2 to 5-1/2 incl 0.030
Over 5-1/2 1%

* 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.

Specified Dimension of Longest Side  Maximum Twist (inches) in 3 feet
1-1/2 and Under 0.050"
Over 1-1/2 to 2-1/2 incl 0.062"
Over 2-1/2 to 4 incl 0.075"
Over 4 to 6 incl 0.087"
Over 6 to 8 incl 0.100"
Over 8 0.112"

SPEEDY METALS ITEMS

3/4" {A} x 1-1/2" {B} x .065" Wall {C} Rectangular Steel Tubing 1" {A} x 1-1/2" {B} x .065" Wall {C} Rectangular Steel Tubing 1" {A} x 1-1/2" {B} x .120" Wall {C} Rectangular Steel Tubing
1" {A} x 2" {B} x .065" Wall {C} Rectangular Steel Tubing 1" {A} x 2" {B} x .120" Wall {C} Rectangular Steel Tubing 1" {A} x 2" {B} x .188" Wall {C} Rectangular Steel Tubing
1" {A} x 3" {B} x .120" Wall {C} Rectangular Steel Tubing 1-1/2" {A} x 2" {B} x .120" Wall {C} Rectangular Steel Tubing 1-1/2" {A} x 2-1/2" {B} x .120" Wall {C} Rectangular Steel Tubing
1-1/2" {A} x 2-1/2" {B} x .188" Wall {C} Rectangular Steel Tubing 1-1/2" {A} x 3" {B} x .120" Wall {C} Rectangular Steel Tubing 1-1/2" {A} x 3" {B} x .188" Wall {C} Rectangular Steel Tubing
2" {A} x 3" {B} x .375" Wall {C} Rectangular Steel Tubing 2" {A} x 3" {B} x .083" Wall {C} Rectangular Steel Tubing 2" {A} x 3" {B} x .120" Wall {C} Rectangular Steel Tubing
2" {A} x 3" {B} x .188" Wall {C} Rectangular Steel Tubing 2" {A} x 3" {B} x .250" Wall {C} Rectangular Steel Tubing 2" {A} x 4" {B} x .120" Wall {C} Rectangular Steel Tubing
2" {A} x 4" {B} x .188" Wall {C} Rectangular Steel Tubing 2" {A} x 4" {B} x .250" Wall {C} Rectangular Steel Tubing 2" {A} x 4" {B} x .312" Wall {C} Rectangular Steel Tubing
2" {A} x 4" {B} x .500" Wall {C} Rectangular Steel Tubing 2" {A} x 5" {B} x .120" Wall {C} Rectangular Steel Tubing 2" {A} x 5" {B} x .188" Wall {C} Rectangular Steel Tubing
2" {A} x 5" {B} x .250" Wall {C} Rectangular Steel Tubing 2" {A} x 6" {B} x .188" Wall {C} Rectangular Steel Tubing 2" {A} x 6" {B} x .250" Wall {C} Rectangular Steel Tubing
2" {A} x 6" {B} x .375" Wall {C} Rectangular Steel Tubing 2" {A} x 8" {B} x .250" Wall {C} Rectangular Steel Tubing 2" {A} x 10" {B} x .188" Wall {C} Rectangular Steel Tubing
2" {A} x 10" {B} x .250" Wall {C} Rectangular Steel Tubing 2-1/2" {A} x 3-1/2" {B} x .250" Wall {C} Rectangular Steel Tubing 2-1/2" {A} x 5" {B} x .188" Wall {C} Rectangular Steel Tubing
3" {A} x 4" {B} x .120" Wall {C} Rectangular Steel Tubing 3" {A} x 4" {B} x .188" Wall {C} Rectangular Steel Tubing 3" {A} x 4" {B} x .250" Wall {C} Rectangular Steel Tubing
3" {A} x 4" {B} x .312" Wall {C} Rectangular Steel Tubing 3" {A} x 5" {B} x .250" Wall {C} Rectangular Steel Tubing 3" {A} x 5" {B} x .375" Wall {C} Rectangular Steel Tubing
3" {A} x 5" {B} x .500" Wall {C} Rectangular Steel Tubing 3" {A} x 6" {B} x .188" Wall {C} Rectangular Steel Tubing 3" {A} x 6" {B} x .250" Wall {C} Rectangular Steel Tubing
3" {A} x 6" {B} x .312" Wall {C} Rectangular Steel Tubing 3" {A} x 6" {B} x .375" Wall {C} Rectangular Steel Tubing 3" {A} x 8" {B} x .250" Wall {C} Rectangular Steel Tubing
3" {A} x 8" {B} x .375" Wall {C} Rectangular Steel Tubing 3" {A} x 10" {B} x .250" Wall {C} Rectangular Steel Tubing 4" {A} x 5" {B} x .250" Wall {C} Rectangular Steel Tubing
4" {A} x 6" {B} x .188" Wall {C} Rectangular Steel Tubing 4" {A} x 6" {B} x .250" Wall {C} Rectangular Steel Tubing 4" {A} x 6" {B} x .375" Wall {C} Rectangular Steel Tubing
4" {A} x 6" {B} x .500" Wall {C} Rectangular Steel Tubing 4" {A} x 7" {B} x .250" Wall {C} Rectangular Steel Tubing 4" {A} x 8" {B} x .188" Wall {C} Rectangular Steel Tubing
4" {A} x 8" {B} x .250" Wall {C} Rectangular Steel Tubing 4" {A} x 8" {B} x .375" Wall {C} Rectangular Steel Tubing 4" {A} x 8" {B} x .500" Wall {C} Rectangular Steel Tubing
5" {A} x 7" {B} x .250" Wall {C} Rectangular Steel Tubing 5" {A} x 7" {B} x .375" Wall {C} Rectangular Steel Tubing 5" {A} x 7" {B} x .500" Wall {C} Rectangular Steel Tubing
6" {A} x 8" {B} x .188" Wall {C} Rectangular Steel Tubing 6" {A} x 8" {B} x .250" Wall {C} Rectangular Steel Tubing 6" {A} x 8" {B} x .375" Wall {C} Rectangular Steel Tubing
6" {A} x 10" {B} x .375" Wall {C} Rectangular Steel Tubing 6" {A} x 10" {B} x .500" Wall {C} Rectangular Steel Tubing 8" {A} x 12" {B} x .250" Wall {C} Rectangular Steel Tubing
1/2" SQ {A} x 0.370" ID {B} x .065" Wall {C} Square Steel Tubing 5/8" SQ {A} x 0.527" ID {B} x .049" Wall {C} Square Steel Tubing 5/8" SQ {A} x 0.495" ID {B} x .065" Wall {C} Square Steel Tubing
3/4" SQ {A} x 0.652" ID {B} x .049" Wall {C} Square Steel Tubing 3/4" SQ {A} x 0.620" ID {B} x .065" Wall {C} Square Steel Tubing 3/4" SQ {A} x 0.510" ID {B} x .120" Wall {C} Square Steel Tubing
1" SQ {A} x 0.902" ID {B} x .049" Wall {C} Square Steel Tubing 1" SQ {A} x 0.870" ID {B} x .065" Wall {C} Square Steel Tubing 1" SQ {A} x 0.834" ID {B} x .083" Wall {C} Square Steel Tubing
1" SQ {A} x 0.760" ID {B} x .120" Wall {C} Square Steel Tubing 1-1/4" SQ {A} x 1.152" ID {B} x .049" Wall {C} Square Steel Tubing 1-1/4" SQ {A} x 1.120" ID {B} x .065" Wall {C} Square Steel Tubing
1-1/4" SQ {A} x 1.084" ID {B} x .083" Wall {C} Square Steel Tubing 1-1/4" SQ {A} x 1.010" ID {B} x .120" Wall {C} Square Steel Tubing 1-1/4" SQ {A} x 0.874" ID {B} x .188" Wall {C} Square Steel Tubing
1-1/2" SQ {A} x 1.370" ID {B} x .065" Wall {C} Square Steel Tubing 1-1/2" SQ {A} x 1.334" ID {B} x .083" Wall {C} Square Steel Tubing 1-1/2" SQ {A} x 1.260" ID {B} x .120" Wall {C} Square Steel Tubing
1-1/2" SQ {A} x 1.124" ID {B} x .188" Wall {C} Square Steel Tubing 1-1/2" SQ {A} x 1.000" ID {B} x .250" Wall {C} Square Steel Tubing 1-3/4" SQ {A} x 1.620" ID {B} x .065" Wall {C} Square Steel Tubing
1-3/4" SQ {A} x 1.584" ID {B} x .083" Wall {C} Square Steel Tubing 1-3/4" SQ {A} x 1.510" ID {B} x .120" Wall {C} Square Steel Tubing 2" SQ {A} x 1.870" ID {B} x .065" Wall {C} Square Steel Tubing
2" SQ {A} x 1.834" ID {B} x .083" Wall {C} Square Steel Tubing 2" SQ {A} x 1.760" ID {B} x .120" Wall {C} Square Steel Tubing 2" SQ {A} x 1.624" ID {B} x .188" Wall {C} Square Steel Tubing
2" SQ {A} x 1.500" ID {B} x .250" Wall {C} Square Steel Tubing 2-1/2" SQ {A} x 2.334" ID {B} x .083" Wall {C} Square Steel Tubing 2-1/2" SQ {A} x 2.260" ID {B} x .120" Wall {C} Square Steel Tubing
2-1/2" SQ {A} x 2.124" ID {B} x .188" Wall {C} Square Steel Tubing 2-1/2" SQ {A} x 2.000" ID {B} x .250" Wall {C} Square Steel Tubing 3" SQ {A} x 2.760" ID {B} x .120" Wall {C} Square Steel Tubing
3" SQ {A} x 2.624" ID {B} x .188" Wall {C} Square Steel Tubing 3" SQ {A} x 2.500" ID {B} x .250" Wall {C} Square Steel Tubing 3" SQ {A} x 2.250" ID {B} x .375" Wall {C} Square Steel Tubing
3-1/2" SQ {A} x 3.124" ID {B} x .188" Wall {C} Square Steel Tubing 3-1/2" SQ {A} x 3.000" ID {B} x .250" Wall {C} Square Steel Tubing 3-1/2" SQ {A} x 2.876" ID {B} x .312" Wall {C} Square Steel Tubing
4" SQ {A} x 3.760" ID {B} x .120" Wall {C} Square Steel Tubing 4" SQ {A} x 3.624" ID {B} x .188" Wall {C} Square Steel Tubing 4" SQ {A} x 3.500" ID {B} x .250" Wall {C} Square Steel Tubing
4" SQ {A} x 3.250" ID {B} x .375" Wall {C} Square Steel Tubing 4" SQ {A} x 3.000" ID {B} x .500" Wall {C} Square Steel Tubing 4-1/2" SQ {A} x 4.124" ID {B} x .188" Wall {C} Square Steel Tubing
5" SQ {A} x 4.624" ID {B} x .188" Wall {C} Square Steel Tubing 5" SQ {A} x 4.500" ID {B} x .250" Wall {C} Square Steel Tubing 5" SQ {A} x 4.000" ID {B} x .500" Wall {C} Square Steel Tubing
6" SQ {A} x 5.624" ID {B} x .188" Wall {C} Square Steel Tubing 6" SQ {A} x 5.500" ID {B} x .250" Wall {C} Square Steel Tubing 6" SQ {A} x 5.250" ID {B} x .375" Wall {C} Square Steel Tubing
6" SQ {A} x 5.000" ID {B} x .500" Wall {C} Square Steel Tubing 8" SQ {A} x 7.500" ID {B} x .250" Wall {C} Square Steel Tubing 8" SQ {A} x 7.376" ID {B} x .312" Wall {C} Square Steel Tubing
8" SQ {A} x 7.250" ID {B} x .375" Wall {C} Square Steel Tubing 8" SQ {A} x 7.000" ID {B} x .500" Wall {C} Square Steel Tubing 10" SQ {A} x 9.500" ID {B} x .250" Wall {C} Square Steel Tubing
10" SQ {A} x 9.250" ID {B} x .375" Wall {C} Square Steel Tubing 12" SQ {A} x 11.000" ID {B} x .500" Wall {C} Square Steel Tubing