SAE AMS 24312F:2017 pdf free

SAE AMS 24312F:2017 pdf free.Peening Media (ASH) Cast Steel Shot, High Hardness (55 to 62 HRC)
The size of shot, specified in 3.8, shall be determined by using a 100 g (approximately) sample and screening as follows:The required standard testing sieves in accordance with ASTM E11 or ISO 3310-1 shall be nested in ascending order with a pan on the bottom. The test sieves diameter shall be a minimum 8 inches (203.2 mm) and height of 1 inch (25.4 mm) or 2 inches (50.8 mm). The 100 g sample shall be poured onto the top sieve and the nested sieves shall be placed in a rotating and tapping type of shaking machine. The rotating speed shall be 270 to 300 rpm and the tapping speed shall be 140 to 1 60 taps per minute. Shaking and tapping shall be continued for 5 minutes±5 seconds for sieves 30 mesh and coarser and 10 minutes±5 seconds for sieves finer than 30 mesh. After shaking, the percentage of shot on each screen shall be determined by weighing the shot retained on each screen.
The mount prepared for microhardness testing shall be also used to evaluate defects. A minimum of 100 particles shall be evaluated for defects. Internal defects (Figure 4) include cracks, hollows, and shrinkage. A maximum of 10%, by count, of particles evaluated may contain cracks. A maximum of 10%，by count, of particles evaluated may contain hollows. A maximum of 10%，by count, of particles evaluated may contain shrinkage. A maximum total of 15%，by count, of particles evaluated may exhibit any defects, cracks, hollows, or shrinkage (see 3.7 4). Particles with more than one defect shall be counted only once in the total. A magnification of 10 to 30X shall be used for evaluation of defects.
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