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Subject: Residual Molybdenum in 17-4PH

Date: 09/07/99
Posted by: Lee Seymour
E-mail: lseymour(at)castingtechnology(dot)com(no spam)
URL: http://www.castingtechnology.com


We have received a Master Heat from our alloy supplier with a "residual" Mo of 0.43%. We have now had several lots fail the 180 ksi tensile requirement for AMS 5344D in the range of 174 - 179 ksi. The yield (160 ksi min) is between 162 and 167 ksi; the elongation (6% min) is 12% and over and the red of area (15% min) is over 25%. Since the furnace charts and furnace calibration checks out, we are looking at the effect of the moly on the transition points of the alloy.

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