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Purlin and runner specification as per IS 811: 2004 and IS 1079: 2009

 
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Dharmendu007
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Joined: 23 Jun 2011
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PostPosted: Thu Jul 23, 2020 9:44 am    Post subject: Purlin and runner specification as per IS 811: 2004 and IS 1079: 2009 Reply with quote

For purlin and runner specification:
     In Table 1 of IS 1079: 2009, chemical composition of HR0 to HR5 designation steel are given. And in Table 3, HR5 is subdivided into YST255 to YST500, and the mechanical properties are given. Now the chemical composition of YST255 to YST500 is essentially same, i.e., that of HR5.      Then how they are having such a wide variation of mechanical properties, for example minimum tensile strength of YST255 is 320MPa and maximum tensile strength of YST500 is 680MPa, but all are having same chemical composition!
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