W shapes with atmospheric corrosion resistance

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W-shapes with atmospheric corrosion resistance (weathering) characteristics can be obtained by specifying ASTM A588 (grade 50) or ASTM A242 (grade 42, which covers tensile group 4 and 5 shapes only; grade 46, which covers tensile group 3 shapes only; or grade 50, which covers tensile group 1 and 2 shapes only). Other mate- rial specifications applicable to W-shapes include ASTM A36, ASTM A529 (grades 50 or 55, which cover ten- sile groups 1 and 2 W-shapes only), ASTM A572 (grades 42 or 50), and ASTM A913 (grade 50). Specifying Material for M-, S-, C- and MC- Shapes As shown in Table 2, the preferred material specification for M-, S-, C- and MC- shapes is ASTM A36, although ASTM A572 grade 50 is increasingly very common. These shapes with higher yield and tensile strength can be obtained by specifying ASTM A572 (grades 42, 50, 55, 60 or 65) or ASTM A529 (grades 50 or 55). Note that although ASTM A913 is an applicable material designation for these shapes, it is only currently available in W- shapes. M-, S-, C- and MC- shapes with atmospheric corrosion resistance (weathering) characteristics can be obtained by specifying ASTM A588 (grade 50) or ASTM A242 (grade 50). The availability of these shapes in grades other than ASTM A36 should be confirmed prior to their specification. Additionally, because many of the M- and MC-shapes are only available from a limited number of producers or are infrequently rolled, their avail- ability should be checked before specifying these shapes. Specifying Material for HP-Shapes The preceding comments for M-, S-, C- and MC- shapes apply equally to HP-shapes, except that ASTM A529 (grades 50 or 55) and ASTM A242 (grade 50) are applicable to tensile group 2 (see Table 1 for tensile group classifications) HP-shapes only, and tensile group 3 HP-shapes with atmospheric corrosion resistance (weather- ing) characteristics can also be obtained by specifying ASTM A242 (grade 46).
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PAGE 5 MATERIALS Specifying Material for Angles As shown in Table 2, the preferred material specification for angles is ASTM A36. The availability of angles in grades other than ASTM A36 should be confirmed prior to their specification. Angles with higher yield and ten- sile strength can be obtained by specifying ASTM A572 (grades 42, 50, 55, 60 or 65) or ASTM A529 (grades 50 or 55, which cover tensile groups 1 and 2 (see Table 1 for tensile group classifications] angles only). Note that although ASTM A913 is an applicable material designation for angles, it is currently only available in W- shapes. Angles with atmospheric corrosion resistance (weathering) characteristics can be obtained by specifying ASTM A588 (grade 50) or ASTM A242 (grade 46, which covers tensile group 3 angles only, or grade 50, which covers tensile group 1and 2 angles only). Availability of certain angles is subject to rolling accumulation and geo- graphical location and should be checked with material suppliers.
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  • Fall '19
  • Structural steel

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