SM570 is Japan JISG3106 standard in the strength and toughness of the highest level of a steel, the steel is mainly used in buildings, Bridges, ships, vehicles and other important engineering structure, because the SM570 steel plate has a high strength, good toughness and welding performance, the production is relatively difficult, at present quite a number of domestic manufacturers have been imported from Japan this steel.
In order to meet the needs of the domestic market, the technology center of the company developed and produced SM570 steel plate, and made a more comprehensive inspection and analysis, also studied the mechanical properties of the steel under different heat treatment systems, and low temperature impact test under different temperatures, both in strength, toughness and low temperature impact toughness and other aspects have reached the standard requirements, and obtained satisfactory results.
Main process points of SM570 steel plate
(1) Using oxidation smelting, decarbonization amount > 0.25%, the reduction period using complex deoxidizer deoxygenation, strengthen the removal [P], [S] operation.
(2) The ingot is heated in the soaking furnace according to group I steel, and the SM570 steel plate adopts two-stage controlled rolling during the rolling process.
The chemical composition of SM570 steel plate is well controlled in smelting, the main elements C. i, Mn content of each furnace fluctuation is very small, phosphorus, sulfur content is also very low, especially sulfur, not only low content and is controlled below 0.007 %, other alloy elements control is more ideal, which lays a good foundation for obtaining good mechanical properties.
The high purity and good microstructure of SM570 steel plate are the necessary conditions to ensure that the steel has high toughness. Therefore, during smelting, the process operation is strengthened to reduce the content of inclusions and harmful elements in the steel as far as possible, in order to ensure the purity of the steel.
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