engleski

Chemical and metallographic analysis of materials used for artillery weapon barrels

The paper presents the procedures and the results of the chemical and metallographic analysis of the barrel material of some artillery weapons: 76 mm field gun, 20 mm anti-aircraft gun and 120 mm mortar. The chemical analysis shows that these are quenched and tempered steels 28NiCrMo55, 32CrMo12 and 36CrNiMo4, which contain from 0.28 to 0.36% of carbon, and they are alloyed with chromium, nickel and molybdenum, i.e. chromium and molybdenum. The metallographic images of the sample cross-sections show a homogeneous structure of the tempered martensite. The measured hardness of the sample ranges from 29 to 33 HRC and is uniformly distributed across the whole cross-section of the sample. For the mentioned steels, this hardness is achieved by hardening from the temperature of about 860°C and high-temperature tempering at 600°C over a period of 2 hours

artillery weapons; barrel; chemical analysis; metallographic analysis; quenched and tempered steel

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