Square & Rectangular Structural 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

Specifications

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"
		Straightness: 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.

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