Standard Specification for High-Temperature Bolting …
2.1 ASTM Standards: 3 A 193/A 193M Specification for Alloy-Steel and Stainless ... For Grade 660 Class D, in the case of conflict, tensile test results shall prevail over minimum hardness. 7.3.2 Number of Tests: 7.3.2.1 Bars 2 in. [50 mm] and Over—One test on each mill-treated length.