Square & Rectangular Structural Alloy Steel Tube

CFERW Cold Formed Electric Resistance Welded
Mechanical Sizes under 2" outside diameter
Structural Sizes 2" outside diameter & over with walls 3/16" & thicker


Grade Class Type Specification
1010 CFERW Mechanical ASTM-A-513, Type 1 or 2
A500B CFERW Structural ATSM-A-500, Grade B

Structural Steel Tube Data

Dimensional Tolerances
Outside Diameter: Twist: Maximum twist per 3 feet of length
Largest outside dimension Outside tolerance including convexity and concavity Longest outside dimension
up to 2 1/2" ±.020" 2" to 2 1/2"inclusive .062"
over 21/2" to 31/2" inclusive ±.025" over 21/2" to 4" inclusive .075"
over 31/2" to 51/2" inclusive ±.030" over 4" to 6" inclusive .087"
over 51/2" ±1% over 6" to 8" inclusive 100"
Tolerances include allowance for convexity or concavity. For
rectangular sections, the tolerance calculated for the larger flat
dimension shall also apply to the smaller flat dimension. This
tolerance may be increased 50 percent when applied to the
smaller dimension, if the ratio of cross sectional dimension
is between 1.5 and 3, and 100 percent when the ratio exceeds 3.
over 8" 112"
Permissable variation shall be 1/8" times the number of feet of total length divided by 5:
.125" x (total length) ÷ 5
Wall Thickness: Squareness of Sides:
Maximum allowable variation ±10% Adjacent sides may deviate from 90° by a tolerance of plus or minus 2 degrees maximum.
(wall thickness is to be measured at the center of the flat, exclusive
of the weld area, and not at the corners)
Worner Radii: Flash:
The radius of any outside corner shal not exceed three times
the specified wall thickness
Structural tubing usually is supplied flash-in. The height of the
flash will vary with the wall thickness of the tube.

Chemical Composition
Grade Designation Chemistry-Ladle Analysis
Carbon Manganese Phosporous Sulfur
A501 (A36) 0.26% max - 0.04% max 0.05% max
A500A 0.26% max - 0.04% max 0.05% max
A500B 0.26% max - 0.04% max 0.05% max
A500C 0.23% max 1.35% max 0.04% max 0.05% max
Copper, when copper steel is specified, 0.20% minimum.
Mechanical Properties
Grade Designation Grade Tensile Strength Yield Strength Minimum Elongation In 2 Inches Minimum
Condition Minimum
A501 (A36) Hot Formed 58,000 psi 36,000 psi 23%
A500A Cold Formed 45,000 psi 39,000 psi 25%
A500B Cold Formed 58,000 psi 46,000 psi 23%
A500C Cold Formed 62,000 psi 50,000 psi 21%
Stock is usually cold formed welded A500B steel.

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.

Production Tube Cutting Inc. can provide competitive tube cutting, tube bending, tube forming, tube machining, custom tube fabrication and tube pre-assembly services for your carbon alloy steel tube requirements, including square and rectangular structural steel tube, with industry codes, industry specifications (grade, class, type, specifications), dimensional tolerances (OD, wall thickness, corner radii, twist, straightness, squareness, flash), chemical composition and mechanical properties. Contact us today for a quick quotation or more information.
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