Weathering steel for railway container with yield strength ≥ 550mpa and production method thereof

Abstract

Railway container weather-proof steel with the yield strength larger than or equal to 550 MPa comprises, by weight, 0.06%-0.12% of C, 0.10%-0.50% of Si, 1.5%-2.0% of Mn, not larger than 0.050% of P, not larger than 0.012% of S, 0.20%-0.40% of Cu, 0.30%-0.80% of Cr, 0.20%-0.40% of Ni, 0.045%-0.10% of Nb, 0.01%-0.045% of Ti, 0.05%-0.20% of Mo and not larger than 0.010%. A production method comprises the steps of conducting smelting, continuous casting blank formation and heating a cast blank; conducting rough rolling; conducting fine rolling; conducting conventional laminar cooling on the blank until the blank is cooled to a coiling temperature; and conducting coiling. By the adoption of the railway container weather-proof steel with the yield strength larger than or equal to 550 MPa and the production method, due to the Nb and Ti composite microalloying technology, on the premise of guaranteeing that the yield strength of a steel plate is larger than or equal to 550 MPa, the tensile strength is larger than or equal to 600 MPa, the ductility is larger than or equal to 18%, the yield strength fluctuation of the same coil is within 26 MPa, the tensile strength fluctuation of the same coil is within 24 MPa, the ductility fluctuation of the same coil is within 2%, and the requirements of higher-end users are met.

Description

technical field [0001] The invention relates to a container steel and a production method, in particular to a weather-resistant steel for railway containers with a yield strength ≥ 550 MPa and a production method. Background technique [0002] Under the background of "increasing speed, reducing self-weight and increasing load" in my country's railway freight car transportation, high strength and light weight are the development direction of weathering steel for railway containers. At present, the main steel plate used for weathering steel for railway containers is weathering steel with a yield strength of 350MPa, which is heavier in unit weight, and has higher steel consumption and transportation costs. It is an effective way to reduce the weight of containers by increasing the strength of steel used in containers and reducing the thickness of steel used in containers. Studies have shown that if 550MPa grade high-strength weathering steel is used as the material used for ra...

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Problems solved by technology

The literature also did not pay attention to the fluctuation of the mechanical properties of the same volume

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