Structural tees wt mt and st shapes general and

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STRUCTURAL TEES (WT-, MT- AND ST- SHAPES) General and Designation These shapes are designated by the mark WT, MT or ST, nominal depth (in.) and nominal weight (lbs/ft). WT-, MT- and ST-shapes are split (sheared or flame-cut) from W-, M- and S-shapes, respectively, and have half the nominal depth and weight of that shape. For example, a WT12 × 27.5 is a structural tee split from a W-shape (W24 × 55), is nominally 12 in. deep and weighs 27.5 lbs/ft. A summary of tees and the shape that they were split from is found in Tables 4k-4m. Specifying Material for Structural Tees For the preferred material specifications, as well as other suitable material specifications, for structural tees, refer to the preceding discussions in the sections on W-, M- or S-shapes, as appropriate. HOLLOW STRUCTURAL SECTIONS (HSS) AND PIPE General Rectangular (including square) HSS have an essentially rectangular (or square) cross-section, except for round- ed corners, and also have a uniform wall thickness, except at the weld seam(s). Both round HSS and pipes have an essentially round cross-section and uniform wall thickness ( t ), except at the weld seam(s). For rectangular HSS, the outside corner radii are taken as 2 t for electric resistance welded (ERW) HSS, except that a centerline corner radius of 1.5 t is used in all cases in the calculation of width-to-thickness ratios. Dimensional information for HSS and pipe is located in Tables 4h-4j. Designation Rectangular HSS are designated by the mark "HSS", overall outside dimensions (in.) and wall thickness (in.), with all dimensions expressed as fractional numbers. For example, an HSS10 × 10 × ½ is nominally 10 in. by 10 in. with
MATERIALS PAGE 6 a ½-in. wall thickness. Round HSS are designated by the term "HSS", nominal outside diameter (in.) and wall thickness (in.) with both dimensions expressed to three decimal places. For example, an HSS10.000 × 0.500 is nominally 10-in. in diameter with a ½-in. nominal wall thickness. Some round HSS are configured to match the dimensional characteristics of steel pipe, such as an HSS5.563 × 0.258, which is the dimensional equivalent of a Pipe 5 Std. steel pipe. Steel pipes up to and including NPS 12 are designated by the term "Pipe", nominal diam- eter (in.) and weight class (Std., x-strong, xx-strong). NPS stands for "nominal pipe size". For example, Pipe 5 Std. denotes a steel pipe with a 5-in. nominal diameter and a 0.258-in. wall thickness, which corresponds to the stan- dard weight series. Steel pipes with wall thicknesses that do not correspond to the foregoing weight classes are designated by the term "Pipe", outside diameter (in.) and wall thickness (in.) with both expressed to three decimal places. For example, Pipe 14.000 × 0.375 and Pipe 5.563 × 0.500 are proper designations. Specifying Material for HSS and Pipe As shown in Table 2, the preferred material specification for round and rectangular (and square) HSS is ASTM A500 grade B, although ASTM A500 grade C is increasingly very common. The availability of HSS in grades other than ASTM A500 grade B should be confirmed prior to their specification. HSS with atmospheric corrosion resistance (weathering) characteristics can be obtained by specifying ASTM A847. Other material specifications

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• Fall '19
• Structural steel

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