Only general information is presented here.
Please contact ASTM for greater detail.
ASTM A-500 SQUARE AND RECTANGULAR STEEL TUBING
Mechanical Properties
(1) Applies to specified wall thicknesses 0.120 in. (3.05 mm) and over.
For wall thicknesses under 0.120 in., the minimum elongation shall
be calculated by the formula: percent elongation in 2 in. = 56t + 17.5.
(2) Applies to specified wall thicknesses 0.180 in. (4.57 mm) and over.
For wall thicknesses under 0.180 in., the minimum elongation shall
be calculated by the formula: percent elongation: in 2 in. = 61t + 12.
(3) Applies to specified wall thicknesses 0.120 in. (3.05 mm) and over.
For lighter wall thicknesses, elongation shall be by agreement with
the manufacturer.
Tolerances - Wall Thickness
The tolerance for wall thickness exclusive of the weld area shall be
plus or minus 0 percent of the nominal wall thickness specified.
The wall thickness is to be measured at the center of the flat.
Square of Sides
For square or rectangular structural tubing, adjacent sides may
deviate from 90 degrees by a tolerance of plus or minus 2 degrees
maximum.
Straightness
The permissible variation for straightness of square and rectangular
structural tubing shall be 1/8 in. times the number of feet of total
length divided by 5.
Corner Radii
For square or rectangular structural tubing, the radius of any outside
corner of the section shall not exceed three times the specified wall
thickness.
CSA G40.21-92 HOLLOW STRUCTURAL SECTIONS
Mechanical Properties Table
NOTE:
It should be noted that the weight per foot for various
Canadian Producing mills may vary slightly from those
indicated in the above tables.
G40.21 - Class H: HSS products conform to CSA G40.21 Class H.
Class H HSS is hot formed to final shape or cold formed to final shape
and stress relieved. Residual stresses in the Class H product are
relatively small and Class H gives superior structural performance.
G40.21 - Class C: Class C is equivalent to H except no stress
relieving operation is performed.
G40.21 - Type W: Type W is suitable for general welded construction
where notch toughness at low temperatures is not a design
consideration.
G40.21 - Type WT: Type WT is suitable for welded construction where
notch toughness at low temperatures is a design requirement.
G40.21 - Type AT: Type AT is suitable for welded construction where
notch toughness at low temperatures is a design requirement and are
often used in structures in unpainted conditions.
G40.21 - Type A: Type A is suitable for sue as weathering steel and
has improved low temperature notch toughness. The atmospheric
corrosion resistance is 4-6 times that of plain carbon steel.
Tolerances - Wall Thickness
Wall thickness shall not deviate by more that -5% or +10% from the
nominal wall thickness specified, except that the weld seam of
welded sections may overrun the maximum thickness tolerance.
In the case of rectangular sections, wall thickness shall be
measured at the center of the flat.
Square of Sides
For rectangular sections, corners shall be square (90 degrees)
within +/-1 degree for hot-formed sections and +/-2 degrees for
cold formed sections. Squareness shall be determined with a
protractor or other suitable measuring device. The average
slope and the sides shall be the basis for determination.
Straightness
Deviation from straightness shall not exceed 1/8 in. x the number
of feet of total length, divided by 5.
Corner Radii
For square or rectangular structural tubing, the radius of any
outside corner of the section shall not exceed three times the
specified wall thickness.
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