High-strength weathering steel and method of manufacturing same

Abstract

The invention discloses a high-strength weatherabile steel and manufacturing method in the low-alloy steel making domain, which is characterized by the following: adding low-carbon and Cu-Cr-Ni-Mo-Nb into two or more composite additives; controlling carbon content with maximum solubility in the alpha-Fe at 0.0218% under normal temperature; reducing carbon-permeating evolution; affirming main control tissue evenly.

Description

technical field [0001] The invention relates to a high-strength weather-resistant steel and a production method thereof, in particular to a high-strength weather-resistant steel with a bainitic structure and a production method thereof, which belong to the field of low-alloy steel manufacturing. Background technique [0002] Before the present invention, high-strength structural steels of similar strength levels were generally produced by quenching and tempering process, but their carbon content was high, such as 100 and 100W steels in the American Society for Testing and Materials standard ASTMA709 / A709M-01b, which required The carbon content must be greater than or equal to 0.10%, so although the strength is guaranteed, the low temperature toughness, welding performance and weather resistance are poor. In 2004, Anshan Iron and Steel Group Corporation applied for "Bainite Steel with High Tensile Strength, High Toughness and Low Yield Ratio and Its Production Method" with th...

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Problems solved by technology

[0003] Aiming at the problems of high carbon content, low-temperature toughness, poor weldability and weather resistance, and low tensile strength in current high-strength structural steels, the present invention provides a steel plate with excellent weather resistance, excellent low-temperature toughness and weldability. High-strength weathering steel with uniform microstructure and mechanical properties in the plate thickness direction and a tensile strength of 690 MPa and its production method, the composition of the steel is designed simply, and the carbon content of the steel is extremely low compared with traditional quenched and tempered high-strength steel , so its microstructure uniformity and mechanical uniformity are better, and the low temperature toughness, weather resistance and welding performance of the steel plate are excellent.