The microstructure and mechanical properties of high strength low-carbon steel, an austenitic stainless steel and the bimetallic semi-product produced from these steels were investigated. Two steels, an S700MC-type high strength low-carbon steel and a 316L-type austenitic stainless steel, were used as the layer materials for bimetallic semi-product, which was produced by electro-slag cladding. The both steels were subjected to warm rolling as a method of thermo-mechanical treatment. The effect of processing conditions on the microstructure and mechanical properties of the 316L and S700MC steels and bimetallic semi-product was clarified. The ultrafine-grained microstructures with average transverse grain sizes of 530 nm and 950 nm were developed in the S700MC and 316L steels, respectively, during warm rolling at 923 K. The developed ultrafine-grained microstructures provided similar strength levels with ultimate tensile strengths of 980 MPa and 945 MPa in the S700MC and 316L steels, respectively. The warm rolled bimetallic semi-product was characterized by the improved combination of high strength and high impact toughness in range from 130 J / cm2 to 540 J / cm2 depending on the impact test direction.Keywords: Austenitic stainless steel, high strength low-carbon steel, bimetallic semi-product, thermo-mechanical treatment
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