SAE AS 7481C:2015 pdf free

SAE AS 7481C:2015 pdf free.Studs, Steel, UNS S66286 Aged After Roll Threaded Procurement Specification For
Finished Parts: Parts, maintained at 1200 °F±3 °F while the tensile load specified in Table 2 is applied continuously, shall not rupture in less than 23 hours. If the shank diameter of the part is less than the maximum minor (root) diameter of the thread but the part can be tested satisfactorily, parts shall conform to the requirements of 3.5.3.1.1.
Parts having a shank diameter less than the maximum minor (root) diameter of the thread shall be tested as in 3.5.3.1, except that the load shall be as specified in 3.5.3.2. The diameter of the area on which stress is based shall be the actual measured minimum diameter of the part.Machined Test Specimens: If the size or shape of the part is such that a stress-rupture test cannot be made on the part, a test specimen prepared as in 4 4.7, maintained at 1200°F±3 °F while a load sufficient to produce an initial axial stress of 65 ksi is applied continuously, shall not rupture in less than 23 hours. Tests shall be conducted in accordance with ASTM E 139.
Specimens may be required by purchaser to perform confirmatory tests.Flow Lines: Examination of a longitudinal section through the threaded ends shall show evidence that the threads were forming by rolling. This evidence shall include traces of flow lines that follow the general thread contour, and shall be of maximum density at root of thread (see Figure 1). Below the thread roots, flow lines not affected by forming shall be parallel to the axis,except that on the nut end of parts formed by extruding, the flow lines may be oblique to the axis for a distance form the end of the larger diameter to the smaller diameter equal to 1 .5 times the “B” dimension of Table 2 of AS3062.
Surface Hardening: Parts shall have no change in hardness from core to surface except as produced during rolling of threads. There shall be no evidence of carburization or nitriding. In case of dispute over results of the microscopic examination, microhardness testing shall be used as a referee method; a Vickers hardness reading of an unrolled surface which exceeds the reading in the core by more than 30 points shall be evidence of nonconformance to this requirement.SAE AS 7481C pdf free download.