Where are the permissible variations in surface condition for structural shapes defined?
ASTM A6/A6M-04b Section 9 defines the permissible variations in the surface condition for structural shapes and plates in the as-rolled condition. It should be recognized that surface imperfections, such as seams and scabs, within these specified limits may be present on material received at the fabrication shop; particularly on heavyweight cross-sections because of higher finishing temperatures and production difficulties. Certain steel chemistries, such as that for ASTM A588 will also exhibit a higher incidence of surface imperfections. Special surface-condition requirements must be specified in the contract documents. Material purchased to meet the requirements of ASTM A6/A6M is usually subject to acceptance or rejection based upon visual inspection both at the rolling mill and at the time of receipt by the fabricator, although more extensive inspection methods may be used. This inspection is important because mills normally limit their contractual liability to replacement or credit
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