OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 1 2024 Ta b l e 2 Chemical composition of cast iron of experimental smelters No. 1 and 2 (wt. %) Element C Si Mn P S Cr Ni Smelting without modifi er 3.55 2.10 0.6 0.086 0.052 0.05 0.06 Smelting with modifi er 3.49 2.51 0.5 0.098 0.055 0.01 0.06 Cast iron grade SCh15 (GOST 1412-85) 3.5–3.7 2.0–2.4 0.5–0.8 ≤0.2 ≤0.15 – – Ta b l e 3 Test results of a combined modifi er from silicon production waste Specimen Modifi er consumption (wt. %) Hardness, HB σu (MPa) Compliance with cast iron grade исходный – 195; 201; 193 139; 143; 147 SCh1510, SCH1515 No. 1 0.5 196; 200; 198 155; 151; 149 SCH1510, SCH1515 No. 2 1.0 205; 208; 209 165; 174; 177 SCH1520 No. 3 1.5 255; 260; 258 305; 310; 312 SCH1530 a b Fig. 3. Lamellar rectilinear form of graphite on the surface of unmodifi ed cast iron specimens: optical (a) and electron (b) microscopy a b Fig. 4. The vermicular graphite shape of the surface of cast iron specimens after modifi cation: optical (a) and electronic (b) microscopy
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