Ultrathin-specification broad hot strip with tensile strength as 600MPa and producing method thereof

Abstract

The invention relates to an ultrathin-specification broad hot strip with the tensile strength as 600MPa and a producing method thereof. The ultrathin-specification broad hot strip comprises the chemical components, by weight percentage, of 0.06-0.10% of C, smaller than or equal to 0.30% of Si, 0.90-1.10% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.015% of S, 0.030-0.050% of Nb, 0.01-0.03% of Ti, 0.010-0.045% of Als, the balanced of Fe and unavoidable impurity elements. The producing method comprises the steps of smelting of molten iron through a rotary kiln, LF refining, continuous casting of slabs, slab heating, scale removal through high-pressure water, controlled rolling, controlled-rolling cooling and winding. The ultrathin-specification broad hot strip can be manufactured through the steps of the producing method. The thickness of the broad hot strip is reduced to 1.2mm, the tensile strength of the broad hot strip is larger than 600MPa, the yield strength of the broad hot strip is larger than 500MPa, and the elongation of the broad hot strip is larger than 30%. The organization of the broad hot strip is ferrite and pearlite, the ferrite occupies about 10%, and the grain size of the broad hot strip is larger than or equal to grade 12. The broad hot strip is mainly used as a high-intensity cold-bent structural member, and the structural self weight and the raw material cost are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a hot-rolled wide-band steel with a tensile strength of 600 MPa and an ultra-thin specification and a production method thereof. Background technique [0002] With the downstream users of iron and steel production enterprises considering the factors of reducing the self-weight of components, reducing the amount of steel used, and reducing production costs, and the country's protection of resources and the environment is gradually increasing, the demand for high-strength, thin-gauge strip steel is increasing rapidly, but for It will be very difficult to reduce the thickness specification of strip steel produced by conventional hot rolling mills to a certain thickness (1.2mm~1.5mm). On the basis of thin specifications, it is required to achieve high strength (tensile strength ≥ 600MPa), which has not yet been achieved in China. Realization, all use hot rolling mills ...

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Problems solved by technology

[0002] With the downstream users of iron and steel production enterprises considering the factors of reducing the self-weight of components, reducing the amount of steel used, and reducing production costs, and the country's protection of resources and the environment is gradually increasing, the demand for high-strength, thin-gauge strip steel is increasing rapidly, but for It will be very difficult to reduce the thickness specification of strip steel produced by conventional hot rolling mills to a certain thickness (1.2mm~1.5mm). On the basis of thin specifications, it is required to achieve high strength (tensile strength ≥ 600MPa), which has not yet been achieved in China. To achieve, hot rolling mills are used to produce hot-rolled raw materials, cold-rolled to the desired thickness specifications (1.2-1.5mm), and quenched and tempered heat treatment processes to achieve the desired mechanical properties.

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