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STRUCTURAL TEES (WT-, MT- AND ST- SHAPES)General and DesignationThese 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 thenominal 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 weresplit from is found in Tables 4k-4m.Specifying Material for Structural TeesFor the preferred material specifications, as well as other suitable material specifications, for structural tees, referto the preceding discussions in the sections on W-, M- or S-shapes, as appropriate.HOLLOW STRUCTURAL SECTIONS (HSS) AND PIPEGeneralRectangular (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 havean 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 2tfor electric resistance welded (ERW) HSS, exceptthat a centerline corner radius of 1.5tis used in all cases in the calculation of width-to-thickness ratios.Dimensional information for HSS and pipe is located in Tables 4h-4j.DesignationRectangular HSS are designated by the mark "HSS", overall outside dimensions (in.) and wall thickness (in.), withall dimensions expressed as fractional numbers. For example, an HSS10×10×½ is nominally 10 in. by 10 in. with
MATERIALS PAGE 6a ½-in. wall thickness. Round HSS are designated by the term "HSS", nominal outside diameter (in.) and wallthickness (in.) with both dimensions expressed to three decimal places. For example, an HSS10.000×0.500 isnominally 10-in. in diameter with a ½-in. nominal wall thickness. Some round HSS are configured to match thedimensional characteristics of steel pipe, such as an HSS5.563×0.258, which is the dimensional equivalent of aPipe 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 aredesignated by the term "Pipe", outside diameter (in.) and wall thickness (in.) with both expressed to three decimalplaces. For example, Pipe 14.000×0.375 and Pipe 5.563×0.500 are proper designations.Specifying Material for HSS and PipeAs shown in Table 2, the preferred material specification for round and rectangular (and square) HSS is ASTMA500 grade B, although ASTM A500 grade C is increasingly very common. The availability of HSS in gradesother than ASTM A500 grade B should be confirmed prior to their specification. HSS with atmospheric corrosionresistance (weathering) characteristics can be obtained by specifying ASTM A847. Other material specifications
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