Thin strip continuous casting economic high-strength binding strip with tensile strength of at least 1100 MPa and manufacturing method thereof

Abstract

The invention relates to a thin strip continuous casting economic high-strength binding strip with a tensile strength of at least 1100 MPa and a manufacturing method thereof. The manufacturing method comprises the following steps: 1) casting a casting strip with a thickness of 1.0-4.5 mm through a double-roll continuous casting process, wherein the casting strip comprises the following chemical components in percentage by weight: 0.25-0.40% of C, 0.15-0.40% of Si, 1.3-2.0% of Mn, no more than 0.015% of P, no more than 0.01% of S, no more than 0.012% of N, at least one of microalloy elements Nb (0.01-0.06%), V (0.01-0.06%), Ti (0.01-0.06%) and Mo (0.10-0.25%) and the balance of Fe and inevitable impurities; 2) cooling the casting strip; 3) performing on-line hot rolling on the casting strip; 4) cooling the hot-rolled strip; 5) coiling; 6) performing cold rolling; and 7) performing blue annealing. According to the high-strength binding strip produced through the economic process of thin strip continuous casting and cold rolling before recovery annealing, the tensile strength is at least 1100 MPa, and the elongation percentage is at least 12%.

Description

technical field [0001] The invention relates to a high-strength steel strap and a manufacturing method thereof, in particular to a strip continuous casting economical high-strength steel strap with a tensile strength ≥ 1100 MPa and a manufacturing method thereof. Background technique [0002] Steel strapping is a thin strip-shaped deep-processing product of steel, mainly used to bundle steel, non-ferrous metals, light textile products, building materials, paper rolls (boards) and wool and other goods. In order to ensure safe loading, unloading and transportation of goods, the straps are required to have high tensile strength and certain elongation. In addition, since the straps are used in outdoor environments for a long time, they are also required to have certain corrosion resistance. [0003] According to the strength, steel strapping can be divided into four categories: low strength, medium strength, high strength and super high strength. Among them, high-strength stra...

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Problems solved by technology

[0027] The object of the present invention is to provide a thin strip continuous casting economical high-strength strap with a tensile strength ≥ 1100 MPa and its manufacturing method. Through reasonable component design and process design, it can solve the problems of serious environmental pollution and production efficiency in the prior art. Low, high production costs, and the unsatisfactory matching of strength and plasticity of high-strength straps produced by existing economical technologies

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