Other material specifications applicable to hss

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resistance (weathering) characteristics can be obtained by specifying ASTM A847. Other material specifications applicable to HSS include ASTM A501 and ASTM A618. The sole material specification for steel pipe is ASTM A53 grade B. Dimensional Tolerances Acceptable dimensional tolerances for HSS are given in ASTM A500 Section 10, A501 Section 11, A618 Section 8 or A847 Section 10, as applicable. Supplementary information can also be found in literature from HSS pro- ducers and the Steel Tube Institute, such as Recommended Methods to Check Dimensional Tolerances on Hollow Structural Sections (HSS) Made to ASTM A500 (available at ). Acceptable dimensional tolerances for steel pipes are given in ASTM A53 Section 12. Supplementary information can also be found in literature from steel pipe producers. PLATES AND BARS General The historical classification system for structural bars and plates suggests that there is only a physical difference between them based upon size and production procedure. In raw form, flat stock has historically been classified as a bar if it is less than or equal to 8 in. wide and as a plate if it is greater than 8 in. wide. Bars are rolled between horizontal and vertical rolls and trimmed to length by shearing or flame cutting on the ends only. Plates are generally produced using one of three methods: 1. Sheared plates are rolled between horizontal rolls and trimmed to width and length by shearing or flame cutting on the edges and ends; 2. Universal mill (UM) plates are rolled between horizontal and vertical rolls and trimmed to length by shearing or flame cutting on the ends only; and, 3. Stripped plates are sheared or flame cut from wider sheared plates.
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PAGE 7 MATERIALS Specifying Thickness There is very little, if any, structural difference between plates and bars. Consequently, the term "plate" is becom- ing a universally applied term today and a PL½ × × 1'-3", for example, might be fabricated from plate or bar stock. For structural plates, the preferred practice is to specify thickness in 1 / 16 -in. increments up to 3 / 8 -in. thick- ness, 1 / 8 -in. increments over 3 / 8 -in. to 1-in. thickness and ¼-in. increments over 1-in. thickness. The current extreme widths for sheared and UM plates are 200 in. and 60 in., respectively. Because mill practices regarding plate widths vary, individual mills should be consulted to determine preferences. For bars, the preferred practice is to specify width in ¼-in. increments and thickness and diameter in 1 / 8 -in. increments. Dimensional Tolerances Acceptable dimensional tolerances for plate products are given in ASTM A6 Section 13. Note that plate thick- ness can be specified in inches or by weight per square foot, and separate tolerances apply to each method. No decimal edge thickness can be assured for plate specified by the latter method. Supplementary information, including permissible variations for sheet and strip and for other grades of steel, can also be found in literature from steel plate producers and the Iron and Steel Society, a division of the American Institute of Mining, Metallurgical and Petroleum Engineers.
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  • Fall '19
  • Structural steel

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