Unformatted text preview: thus, alloys 4340, 4140, and 8640 qualify. 11.D4 A ninety millimeter (three and one-half inch) diameter cylindrical steel specimen is to be quenched in moderately agitated water. We are to decide which of eight different steels will have surface and center hardnesses of at least 55 and 40 HRC, respectively. In moderately agitated water, the equivalent distances from the quenched end for a 90 mm diameter bar for surface and center positions are 3 mm (1/8 in.) and 20 mm (13/16 in.), respectively [Figure 11.8(a)]. The hardnesses at these two positions for the alloys cited are given below. Surface Center...
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- 8 mM, 12 mm, 20 mm, 3 mm, 38 mm