Page 37 - MDI Steel Reference Guide
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Square and Rectangular Tubing
Mechanical: Conforms to ASTM A513 Type 1 (AWHR), or Type 2 (AWCR).
An electric resistance welded tubing produced from low carbon steel. Offers good surface finish and forming characteristics. All sizes have the OD flash removed, with the ID flash- in. Generally available in wall thickness lighter than 11ga., in widths less than 3 inches.
Structural: ConformstoASTMA500-Grade B.
An electric resistance welded tube produced from a structural grade of steel. Offers a high strength-to-weight ratio, yet is easily welded, formed, punched, and drilled. All sizes have the OD flash removed, with the ID flash-in. Minimum mechanical properties: Tensile Strength = 58,000 psi, Yield Strength = 46,000 psi, % Elongation in 2” = 23%.
Gauge - Decimal Equivalents
The usual gauge designation for welded steel Tube is BWG (Birmingham Wire Gauge).
Gauge number Decimal Eq.
6
.203
7
.180
8
.165
9
.148
10
.134
11
.120
12
.109
14
.083
16
.065
18
.049
20
.035
Note: Min / Max based on ASTM A500 & A513, +/- 10% of nominal.
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