UDC 614.841
The issues of the influence of temperature action on the change in the composition of scale are considered. The composition of scale obtained under the influence of temperatures of various durations on hot-rolled steel objects has been studied by X-ray diffraction analysis. In the course of the study, carbon steel sheets of the St3 brand were used. It was found that when exposed to temperature on hot-rolled steel objects, depending on the duration of heating, the thickness of the scale and the content of wustite in it increases in proportion to the increase in exposure time and temperature. It is shown that when the object is heated to a temperature of 800°C, there is a gradual increase in the thickness of the scale to 0.05 mm, then at a temperature of 850°C there is a sharp increase in the thickness of the scale by 2 times in all time intervals of the study. Further, up to a temperature of 950°C, the increase also proceeds smoothly, the thickness of the scale increases by 1.25 times for every 50°C. At a temperature of 1000° C, there is also a sharp increase in the thickness of the scale by almost 2 times. It was found that when measuring the thickness of scale and studying diffractograms of monotypic steel objects at the fire site, it is possible to assume the place that was subjected to the greatest temperature exposure. An area with extremely high values of scale thickness and wustite content in it corresponds to extremely high thermal lesions and vice versa
x-ray diffraction analysis, steel products, fire, temperature exposure, analysis
1. Elakov A.S. Metody izucheniya stal'nyh izdeliy v pozharno-tehnicheskoy ekspertize / Elakov A.S.// Pozharnaya i avariynaya bezopasnost': sbornik materialov XIII Mezhdunarodnoy nauchno-prakticheskoy konferencii, posvyaschennoy Godu kul'tury bezopasnosti, Ivanovo, 29-30 noyabrya 2018 goda. Tom Chast' 1. - Ivanovo: FGBOU VO IPSA GPS MChS Rossii, 2018. - S. 83-87. EDN: https://elibrary.ru/HNYZKE
2. Talay I.Ya. Metody issledovaniya stal'nyh izdeliy, primenyaemye v pozharno-tehnicheskoy ekspertize / Talay I.Ya., Dolgushina L.V. // Aktual'nye problemy obespecheniya pozharnoy bezopasnosti i zaschity ot chrezvychaynyh situaciy: Materialy IV Vserossiyskoy nauchno-prakticheskoy konferencii, Krasnoyarsk, 21 aprelya 2023 goda. - Zheleznogorsk: FGBOU VO SPSA GPS MChS Rossii 2023. - S. 51-53. EDN: https://elibrary.ru/IXBOLD
3. Cheshko I.D. Ekspertiza pozharov (ob'ekty, metody, metodiki issledovaniya) /Pod nauch. red. kand. yur. nauk Andreeva N.A. - 2-e izd., stereotip. - SPb.: SPbIPB MVD Rossii. 1997. - 562 s.
4. Sokolova A.N., Cheshko I.D. Primenenie instrumental'nyh metodov i tehnicheskih sredstv ekspertizy pozharov: Sbornik metodicheskih rekomendaciy / Sokolovoy A.N., Cheshko I.D. SPb.: SPb filial FGU VNIIPO MChS Rossii, 2018. 279 s.
5. Pivovarova K.G. Obespechenie kachestva poverhnosti vysokouglerodistoy stal'noy katanki / Pivovarova K.G. // Teoriya i tehnologiya metallurgicheskogo proizvodstva. - 2021. - No 3(38). - S. 24-29. EDN: https://elibrary.ru/XLIYNA
6. Nikiforov A.V. Metody issledovaniya holodnodeformirovannyh stal'nyh izdeliy v ekspertnyh celyah / Nikiforov A.V. // Teoreticheskie i prikladnye voprosy kompleksnoy bezopasnosti: Materialy III Mezhdunarodnoy nauchno-prakticheskoy konferencii, Sankt-Peterburg, 20 marta 2020 goda. - Sankt-Peterburg: Sankt-Peterburgskiy universitet GPS MChS Rossii, 2020. - S. 52-54. EDN: https://elibrary.ru/RTMPBG
7. Galishev M.A., Bel'shina Yu.N., Dement'ev F.A., Sikorova G.A. Pozharno-tehnicheskaya ekspertiza: Uchebnik // SPb.: Sankt-Peterburgskiy universitet GPS MChS Rossii, 2014. 453 s.
8. Pariyskaya A.Yu., Mokryak A.Yu., Bel'shina Yu.N. i dr. Rentgenovskie metody analiza v sudebnoy pozharno-tehnicheskoy ekspertize: Uchebnoe posobie. // SPb.: Sankt-Peterburgskiy universitet GPS MChS Rossii, 2017. - 84 s. EDN: https://elibrary.ru/ZAEUGD
9. Sikorova G.A., Smirnov V.A. Metodika iz'yatiya i issledovaniyu stal'nyh izdeliy v pozharno-tehnicheskoy ekspertize // Pozharnaya bezopasnost': problemy i perspektivy. 2014. T. 1. No 1 (5). S. 304-308. EDN: https://elibrary.ru/VMDIMX
10. Motorygin Yu.D., Sikorova G.A. Regressionnaya model' stepeni termicheskogo porazheniya holodnodeformirovannyh stal'nyh elementov transportnyh sredstv // Tehnosfernaya bezopasnost'. 2021. No 3 (32). S. 51-59. EDN: https://elibrary.ru/QKKCRO
11. Yakupov I.F., Galkin S.A., Topilkin P.S. Sposob ocenki temperatury nagreva stal'nyh konstrukciy po rezul'tatam issledovaniya tolschiny i sostava okaliny // Nauchnye issledovaniya molodyh uchenyh: sbornik statey XV. - 2021. - S. 13. EDN: https://elibrary.ru/NAUGXK
