Physical and technological properties of fine-grained low-alloy steel 09G2S

The article discusses the influence of low-alloy steels and their heat treatment on increasing the structural strength of low-carbon, low-alloy steels. The influence of austenitization temperature and quenching cooling rate, in various environments, on the tendency of these steels to form lamellar martensite is also discussed. It has been established that the low-alloy steel grade 09G2S is corrosion-resistant and ductile, making it suitable for pipeline design and other metal structures. Treatments that promote the lamellar martensite structure increase structural strength and cold resistance at subzero temperatures. The results of numerical modeling of the microstructural evolution of 09G2S steel using the Johnson-Mehl-Avrami-Kolmogorov model during hot plastic deformation are also presented. The average grain size and volume fraction of recrystallized grains are calculated during dynamic recrystallization. The feasibility of using JMatPro software for modeling microstructure evolution is demonstrated. The results of a thermokinetic calculation of the phase composition of 09G2S steel in equilibrium are presented, along with thermokinetic and isothermal diagrams. The results obtained can be used to design technological processes for the production of various products through different types of thermal deformation.

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