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9/5/1995
No. HSS produced in accordance with the requirements of CSA Standard G40.21 must meet the requirements of Table 31 in CSA Standard G40.20. This Table specifies that the mass (or weight in Imperial units) shall not deviate from the published mass by more than -3.5%. By comparison, ASTM A500 permits deviation in the wall thickness of up to -10%. Studies show that significant reductions in the compressive strength of HSS, in comparison with the design values shown in the CISC Handbook of Steel Construction, occur when the wall thickness is reduced beyond the CSA limits. The Handbook values are based on published dimensions.
In addition, CSA standard G40.21, grade 350W specifies an ultimate tensile strength range of 450 to 620 MPa. ASTM A500 grade C specifies only a minimum ultimate tensile strength of 427 MPa. There are also differences in the chemical requirements and elongation requirements listed in ASTM A500 in comparison with CSA G40.21.
As far as round HSS is concerned, ASTM A500 grade C specifies a minimum yield point of 317 MPa, rather than the 350 MPa specified in CSA G40.21.
Clause 5.1.1 of Canadian Standard CAN/CSA S16.1-94 "Limit States Design of Steel Structures" refers to CSA Standard G40.21 for acceptable steel material and products for use with S16.1. Accordingly, if HSS produced in accordance with ASTM A500, grade C are offered as a substitute for HSS specified to meet G40.21, grade 350W, it would be prudent to take into account the possible differences in wall thickness and strength.
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