Steel Protac 550 is characterized by high quality mechanical properties and resistance to bullet impact even at relatively small thickness.
For this thesis, we measured the thermal properties of Protac 550 steel in the as-received condition, after water quenching, and after tempering. We specified the specific heat of the steel and measured its thermal conductivity and diffusivity.
The experimental part of the study was carried out under ambient conditions on the apparatus TPS Hot Disk 2200 (manufactured by Hot Disk AB) using the transient plane source method (TPS) standardized in ISO 22007-2. In addition, we measured the hardness of the samples after each stage of the hardening process.
The results showed that Protac 550 has the highest thermal conductivity and diffusivity among the selected ballistic protection steels. Its maximum level of thermal properties is achieved after the tempering stage of the hardening process.
The paper also contains definitions of thermal properties, characteristics of ballistic protection steels and standard methods thermal properties measurements.
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