Influence of Heat Treatment Process on the Microstructure and Property of Wear-resistant Steel NM450
MA Heng
MA Guangting
WANG Yuexiang
Abstract：The heat treatment process quenching at 930℃+holding for 20 mins and tempering at 200℃+holding for 25 mins were carried out for 16 mm NM450 wear-resistant steel plate produced by controlled rolling and controlled cooling process. The microstructure and properties of as-rolled, quenched, and tempered steel plates were sampled and analyzed. The results showed that, there were ferrite+pearlite and a little of bainite in the microstructure of as-rolled plate, martensite+retained austenite and a small amount of bainite in the microstructure of quenched plate, and martensite+retained austenite+acicular bainite in the microstructure of tempered plate. After the tested steel was quenched and tempered, its tensile strength was 1 378 MPa, its elongation A50 was 21.5%, its charpy impact energy at-20℃was 61 J, its brinell hardness on plate surface was 443 HBW. The steel plate possesses a good comprehensive mechanical property.
Keywords：wear-resistant steelNM450 steelquenchingtemperingmicrostructuremechanical property
Publication Date：2015-07-02
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 39-41 )