Rolled Steel Sections Machinery's Handbook, 31st Edition
2691
ROLLED STEEL, WIRE, SHEET METAL, WIRE ROPE Rolled Steel Sections
Lengths of Angles Bent to Circular Shape.— To calculate the length of an angle-iron used either inside or outside of a tank or smokestack, the following table of constants may be used: Assume, for example, that a stand-pipe, 20 feet inside diameter, is provided with a 3 by 3 by 3 ∕ 8 inch angle-iron on the inside at the top. The circumference of a circle 20 feet in diameter is 754 inches. From the table of constants, find the constant for a 3 by 3 by 3 ∕ 8 inch angle-iron, which is 4.319. The length of the angle then is 754 − 4.319 = 749.681 inches. Should the angle be on the outside, add the constant instead of subtracting it; thus, 754 + 4.319 = 758.319 inches. Size of Angle Const. Size of Angle Const. Size of Angle Const. 1 ∕ 4 × 2 × 2 2.879 5 ∕ 16 × 3 × 3 4.123 1 ∕ 2 × 5 × 5 6.804 5 ∕ 16 × 2 × 2 3.076 3 ∕ 8 × 3 × 3 4.319 3 ∕ 8 × 6 × 6 7.461 3 ∕ 8 × 2 × 2 3.272 1 ∕ 2 × 3 × 3 4.711 1 ∕ 2 × 6 × 6 7.854 1 ∕ 4 × 2 1 ∕ 2 × 2 1 ∕ 2 3.403 3 ∕ 8 × 3 1 ∕ 2 × 3 1 ∕ 2 4.843 3 ∕ 4 × 6 × 6 8.639 5 ∕ 16 × 2 1 ∕ 2 × 2 1 ∕ 2 3.600 1 ∕ 2 × 3 1 ∕ 2 × 3 1 ∕ 2 5.235 1 ∕ 2 × 8 × 8 9.949 3 ∕ 8 × 2 1 ∕ 2 × 2 1 ∕ 2 3.796 3 ∕ 8 × 4 × 4 5.366 3 ∕ 4 × 8 × 8 10.734 1 ∕ 2 × 2 1 ∕ 2 × 2 1 ∕ 2 4.188 1 ∕ 2 × 4 × 4 5.758 1 × 8 × 8 11.520 1 ∕ 4 × 3 × 3 3.926 3 ∕ 8 × 5 × 5 6.414 … … Standard Designations of Rolled Steel Shapes.— Through a joint effort, the American Iron and Steel Institute (AISI) and the American Institute of Steel Construction (AISC) have changed most of the designations for their hot-rolled structural steel shapes. The present designations, standard for steel producing and fabricating industries, should be used when designing, detailing, and ordering steel. The accompanying Table 1 compares the present designations with the previous descriptions. Table 1. Hot-Rolled Structural Steel Shape Designations (AISI and AISC) Present Designation Type of Shape Previous Designation W 24 × 76 W shape 24 WF 76 W 14 × 26 W shape 14 B 26 S 24 × 100 S shape 24 I 100 M 8 × 18.5 M shape 8 M 18.5 M 10 × 9 M shape 10 JR 9.0 M 8 × 34.3 M shape 8 × 8 M 34.3 C 12 × 20.7 American Standard Channel 12 [20.7 MC 12 × 45 Miscellaneous Channel 12 × 4 [45.0 MC 12 × 10.6 Miscellaneous Channel 12 JR [10.6 HP 14 × 73 HP shape 14 BP 73 L 6 × 6 × 3 ∕ 4 Equal Leg Angle ∠ 6 × 6 × 3 ∕ 4 L 6 × 4 × 5 ∕ 8 Unequal Leg Angle ∠ 6 × 4 × 5 ∕ 8 WT 12 × 38 Structural Tee cut from W shape ST 12 WF 38 WT 7 × 13 Structural Tee cut from W shape ST 7 B 13 St 12 × 50 Structural Tee cut from S shape ST 12 I 50 MT 4 × 9.25 Structural Tee cut from M shape ST 4 M 9.25 MT 5 × 4.5 Structural Tee cut from M shape ST 5 JR 4.5 MT 4 × 17.15 Structural Tee cut from M shape ST 4 M 17.15 PL 1 ∕ 2 × 18 Plate PL 18 × 1 ∕ 2 Bar 1 Square Bar Bar 1 Bar 1 1 ∕ 4 ∅ Round Bar Bar 1 1 ∕ 4 ∅ Bar 2 1 ∕ 2 × 1 ∕ 2 Flat Bar Bar 2 1 ∕ 2 × 1 ∕ 2 Pipe 4 Std. Pipe Pipe 4 Std. Pipe 4 X-Strong Pipe Pipe 4 X-Strong Pipe 4 XX-Strong Pipe Pipe 4 XX-Strong TS 4 × 4 × .375 Structural Tubing: Square Tube 4 × 4 × .375 TS 5 × 3 × .375 Structural Tubing: Rectangular Tube 5 × 3 × .375 TS 3 OD × .250 Structural Tubing: Circular Tube 3 OD × .250 Data taken from the “Manual of Steel Construction,” 8th Edition, 1980, with permission of the American Institute of Steel Construction.
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