AFNOR 15CDV6 is heat treatable high strength low alloys (HSLA) material and is widely being used in solid rocket motor cases manufacturing due to its high specific strength and weldability in both annealed and heat treated conditions. Present study is made to find out the impact of soaking time in hardening and tempering treatment on the mechanical properties of 15CDV6 material. Two forging specimens with different effective thicknesses 110 mm and 40 mm are used for this purpose. Hardening and tempering is carried out for these two specimens together with the soaking time applicable to 110 mm thickness. In this case, the 40 mm thick specimen is subjected to over soaking. Electrically heating furnace is used for this purpose. First hardening is carried out at 810 ºC and second hardening is carried out at 930 ºC followed by tempering at 610 ºC. In all heat treatment cycles, quench medium is water. Hardness test, tensile test are carried out as performance characteristics and the test results are compared for both the specimens. The metallurgical characteristics of both the specimens are discussed briefly. The Charpy impact test is conducted for the 40 mm effective thickness specimen.

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