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ASTM A-500 Tubing Home

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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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