Heat Treating Gun Steel
WATERVLIET ARSENAL NY BENET WEAPONS LAB
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A study was conducted to evaluate the effect of tempering time on the mechanical properties of gun steel, a medium C, Ni-Cr-Mo steel used in cannon tube forgings. The results on small specimen tests show that in tempering at temperatures up to 1100 deg F, time is not important beyond 60 minutes. Above 1100 deg F, time becomes a more important factor. For the yield strength range of many tubes, 160-180 ksi, tempering at 1000-1100 deg F is required. Thus, for these tubes, the tempering cycle can be drastically shortened. Data were also developed for two austenitizing temperatures, 1550 deg F which is usually used and 1750 deg F which is used in some furnaces which utilize a high thermal head and allow a short austenitizing cycle. It is demonstrated that the latter would not allow the tube forging requirements to be satisfied, and dictate that austenitizing temperatures must be maintained at lower temperature.
- Metallurgy and Metallography
- Fabrication Metallurgy