On the importance of mathematical calculations in the study of structure characteristics and the physical and mechanical properties of 30XGSA steel, smelted on a different charge

The article considers the influence of quality initial charge on structure and physical mechanical properties structural medium-alloy steel 30KhGSA. It was found that 30KhGSA (smelters No. 3-4) cast in cast-iron molds (ingot weight 2.6 t) has a significant chemical heterogeneity liquation carbon main alloying elements (Cr Mn), melting semi-product boiling slag layer, is more pronounced. Starting from tempering temperature 500∘C, both melts (the fluidized layer ordinary metallized charge) becomes uniform are aligned. Microstructural studies have established with an increase annealing at single exposure, inhomogeneity decreases, but not significantly. 1000 ∘C, when increases, grain diversity growth austenitic grains appear, especially layer. Different sizes adversely affect steel: enlargement reduces resistance to brittle fracture, worsens service characteristics metal. Elimination can be achieved by conducting ho-mogenizing (annealing 950 ∘C for 8 hours). An leads intensive growth, smelted original charge. shown 30XGSA steel, which melted improved state equal hardness strength characteristics, increased plastic impact comparison conventional Apparently, this should also determine higher operating obtained use pure primary