Structural Steel Tubing Specifications

Our structural tubing is produced in accordance with the mechanical and chemical property requirements of the latest revision of ASTM A500, Grades

A, B and C or CSA G40.21 50W. 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% when applied to the smaller dimension if the

ratio of cross-sectional dimensions is between 1.5 and 3, and 100% when the ratio exceeds 3.

Wall Thickness

Maximum allowable variation 10% for ASTM A500 (wall thickness is to be measured at the center of the flat, exclusive of the weld area). For CSA

maximum deviation is C5% or +10%.

Squareness of Sides

Adjacent sides may deviate from 90 by 2.

Straightness

Permissible variation, inches:

Number of feet

125 x total length/5

Corner RadiiCA500 Specifications

The radius of any outside corner shall not exceed three times the specified wall thickness for A500.

 *Manganese content of 0.85 to 1.35 % and silicon content of 0.15 to 0.30 % is required for shapes over 426 lb./ft.

Corner Radii-CSC Specifications

Wall Thickness

Maximum Outside Corner

Inches

Inches

Perimeter to

Perimeter over

24 inches inclusive

24 inches

To 0.109 inclusive

0.218

Over 0.109-0.134 inclusive

0.268

Over 0.134-0.156

0.312

Over 0.156-0.188 inclusive

0.47

Over 0.188-0.250 inclusive

0.625

0.75

Over 0.250-0.313 inclusive

0.785

0.94

Over 0.313-0.375 inclusive

0.938

1.125

Over 0.375-0.500 inclusive

1.25

1.5

Over 0.500

3 x wall thickness

Structural Steel Tubing Specifications:

Structural Steel Tubing Specifications:

Mechanical Properties

ASTM500

A500

A500

CSA-M92

Squares and Rectangles

Gr.A

Gr.B

Gr.C

G40.2150W

Tensile strength, min.psi

45,000

58,000

62,000

65,000

Yield strength, min.psi

39,000

46,000

50,000

50,000

Elongation in 2min.

25%

23%

21%

22%

Mechanical Properties

Rounds

Tensile strength.min.psi

45,000

58,000

62,000

65,000

Yield strength.min.psi

33,000

42,000

46,000

50,000

Elongation in 2min.

25%

23%

21%

22%

Chemical Composition

Carbon, max. %

0.26

0.26

0.23

0.23

Phosphorus, max. %

0.04

0.04

0.04

0.04

Sulfur, max. %

0.05

0.05

0.05

0.05

Manganese, max. %

1.35

0.05-1.50

Silicon, max. %

0.4

Tolerance (Squares and Rectangle)

Largest outside dimension

outside tolerance including convexity and concavity

Up to 2 1/2

+/- 0.020

+/- 0.020

Over 2 1/2 to 3 1/2 inclusive

+/- 0.025

+/- 0.030

Over 3 1/2 to 5 1/2 inclusive

+/- 0.030

+/- 0.040

Over 5 1/2

+/- 1

+/- 1

Twist

Largest outside dimension

Maximum twist per 3 of length

To 1 1/2 inclusive

0.050

0.050

Over 1 1/2 TO 2 1/2 inclusive

0.062

0.062

Over 2 1/2 TO 4 inclusive

0.075

0.075

Over 4 TO 6 inclusive

0.087

0.087

Over 6 TO 8 inclusive

0.100

0.100

Over 8

0.112

0.112

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