Low performance wear-resistant steel plate and high performance wear-resistant steel plate technology for steel plate manufacturers
The main technical requirements, production process and research status at home and abroad of high-performance wear-resistant steel plate of steel plate manufacturers are introduced. The composition, properties, strengthening mechanism and production process of Quasi-Bainite high-strength wear-resistant steel, austenite wear-resistant steel and martensite wear-resistant steel are emphatically introduced. It is pointed out that serialization and economy should be emphasized in the development of wear-resistant steel. Based on the microstructure and properties of SB wear-resistant steel and B24S wear-resistant steel, the heat treatment process of B24S wear-resistant steel was studied in order to improve the properties of the material by heat treatment. The microstructure and mechanical properties of SB wear-resistant steel and B24S wear-resistant steel were observed by optical microscope, scanning electron microscope, transmission electron microscope and universal testing machine. Different heat treatment schemes are set up for heat treatment experiments. Microstructure analysis of Swedish SB wear-resistant steel shows that the main microstructure of the sample is lath martensite and bainite, and the microstructure is uniform and fine.
The surface cracking of wear-resistant steel NM400 was observed and analyzed by means of metallographic microscope and scanning electron microscope. The results show that the cracks on the surface of the samples during the tensile process of NM400 are caused by intergranular cracks, which may occur in cooling and cutting processes after the rolling. The inclusions along grain boundaries weaken the grain boundaries, and the inclusions at grain boundaries act as crack sources under the action of internal stress. The cracks formed during the subsequent quenching and heating process are characterized by high temperature oxidation and slight decarburization. Its mechanical properties are tested and its tensile strength reaches 1360Mpa and yield strength reaches 1240Mpa. The microstructure of B24S wear-resistant steel sheet under hot rolling is bainite and sorbite. The microstructure is fine and uniform. There are carbides and inclusions precipitated. The inclusions are mainly titanium nitride by EDS analysis.

The microstructure of B24S wear-resistant steel after quenching treatment is lath martensite and bainite. The high strength martensite and the good toughness bainite make the material have high tensile strength and yield strength. In the cooling process of supercooled austenite, the bainite bundles produced by transformation refine the original austenite grain, and get fine martensite bundles during the subsequent martensitic transformation, which improves the tensile strength and yield strength of B24S wear-resistant steel plate. The tempering temperature after quenching is inversely proportional to the strength and yield strength of the material. The higher the tempering temperature is, the tensile strength and yield strength of B24S wear-resistant steel decrease gradually. The bainite content in the microstructure affects the mechanical properties of the material.
With the increase of bainite content, martensite content decreases, and lower bainite overlaps with each other, which weakens the effective fractionation of original austenite grains, resulting in the gradual decrease of tensile strength and yield strength of B24S wear-resistant steel plate.
The effect of heat treatment on Microstructure and mechanical properties of low alloy wear-resistant cast steel. The effects of homogenization on microstructure, quenching temperature and time, tempering temperature on Microstructure and mechanical properties of low alloy wear-resistant steel, tempering temperature on impact fracture were studied. The effect of heat treatment on the microstructure and properties of wear resistant steel was discussed.
The experimental results show that homogenization can eliminate dendrite segregation in casting process. The hardness of the V-notched specimens is 48HRC, and the impact toughness of the V-notched specimens is 24J at low temperature. The wear resistant steel plate is lath martensite + film retained austenite + dispersed fine carbide. (the brittleness of boron-containing alloys during casting leads to the serious deterioration of properties. the research significance of this topic is lost. the influence of alloying elements on the microstructure and properties of wear-resistant cast steel is mainly studied. the influence of carbon, nickel and vanadium alloying elements on the microstructure and properties and the influence of alloying elements on the hardenability are also studied.
Under the same heat treatment regime, with the increase of carbon content, the amount of carbide in the microstructure increases, the hardness of the specimen increases and the impact toughness decreases at low temperature; the effective width of martensitic lath bundle increases, the amount of retained austenite increases, and the impact toughness at high and low temperature increases with the addition of nickel; the amount of carbide in the microstructure increases with the addition of vanadium. Improve the hardness of the sample. The elements Ni, Mn and C dissolved in austenite increase the hardenability, while the carbide forming elements Cr and V decrease the hardenability.