This specification covers aluminum-alloy rolled tread plate. Unless otherwise specified, all tread plate shall be supplied in the mill finish and shall be uniform as defined by the requirements and shall be commercially sound. The tread plate shall conform to the required chemical composition limits specified. The determination of chemical composition shall be made in accordance with suitable chemical (test methods E 34) or spectrochemical (test methods E 607 and E 1251) methods. Heat treatment for the applicable tempers of alloy 6061 shall be in accordance with practice B 918. The tread plate shall conform to the tensile properties specified. The tension test shall be made in accordance with test methods B 557. The bend tests shall be made in accordance with test method E 290.

1.1 This specification covers aluminum-alloy rolled flat tread plate, mill-finish, with a raised pattern on one side, in the alloy, tempers, and thicknesses shown in Table 1 and Table 2 [Table 3].

1.2 Alloy and temper designation are in accordance with ANSI H35.1/H35.1M. The equivalent Unified Numbering System alloy designation are those of Table 1 preceded by A9, which is A96061 for alloy 6061 and A93003 for Alloy 3003 in accordance with Practice E 527.

1.3 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.

1.4 The values stated in either inch-pound or SI units are to be regarded separately as standard. The SI units are shown either in brackets or in separate tables. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems will result in nonconformance with the specification.