An investigation of new PROTAC 500 armour steel was conducted. Three plates were heat treated to different states. One was quenched, the second and third were quenched and low temperature tempered at 220 and 280 °C for 3 hours. A tensile test, hardness measurements, and an instrumented Charpy test were performed. Metallographic was performed by optical microscopy (OM). Ballistic resistances of all three steel plates were measured. The behaviour of steel was tested using armour piercing projectiles 7.6239 mm API BZ (former soviet designation for Armor Piercing Incendiary bullet). The best results were obtained in quenched state.
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机译：对新的PROTAC 500装甲钢进行了研究。将三个板热处理至不同状态。一个被淬火，第二个和第三个被淬火，并在220和280°C下低温回火3小时。进行了拉伸试验，硬度测量和仪器化的夏比试验。金相通过光学显微镜（OM）进行。测量了所有三个钢板的防弹性能。使用7.6239 mm API BZ装甲穿甲弹测试了钢的性能（前身为装甲穿甲燃烧弹的苏联名称）。在淬火状态下可获得最佳结果。
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