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

A technology of tensile strength and production method, which is applied in the field of metallurgy, can solve problems such as difficulties, and achieve the effects of reducing production cycle, saving raw material cost, and saving processing time

Inactive Publication Date: 2015-11-25
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 prod

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Tensile strength 600MPa grade ultra-thin hot-rolled wide strip steel, thickness 1.2mm, chemical composition and weight percentage: C: 0.06%, Si: 0.12%, Mn: 0.90%, P: 0.008%, S: 0.005% , Nb:: 0.030%, Ti: 0.01%, Als: 0.020%, the balance is Fe and unavoidable impurity elements.

[0034] The production process is as follows: molten iron undergoes converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, controlled rolling cooling, and coiling processes to obtain ultra-thin specification hot-rolled wide strips with a tensile strength of 600MPa ; Among them, the slab heating process, the heating temperature is 1275 ° C, and the heating time is 140 min; the controlled rolling process includes rough rolling, hot coil box coiling, and finish rolling; the rough rolling is 5 rolling, the outlet temperature is 1115 ° C; Coil box coiling, temperature 1040°C for finish rolling, finish rolling is 7-pass rolling, inlet te...

Embodiment 2

[0037] Tensile strength 600MPa grade ultra-thin hot-rolled wide strip steel, thickness 1.2mm, chemical composition and weight percentage: C: 0.08%, Si: 0.03%, Mn: 0.99%, P: 0.012%, S: 0.004% , Nb: 0.035%, Ti: 0.021%, Al: 0.018%, and the balance is Fe and unavoidable impurity elements.

[0038]The production process is as follows: molten iron undergoes converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, controlled rolling cooling, and coiling processes to obtain ultra-thin specification hot-rolled wide strips with a tensile strength of 600MPa ; Among them, the slab heating process, the heating temperature is 1270 ° C, and the heating time is 150 min; the controlled rolling process includes rough rolling, hot coil box coiling, and finish rolling; the rough rolling is 5 rolling, the outlet temperature is 1110 ° C; Coil box coiling, finish rolling at a temperature of 1045°C, the finish rolling is 7-pass rolling...

Embodiment 3

[0041] Tensile strength 600MPa grade ultra-thin hot-rolled wide strip steel, thickness 1.2mm, chemical composition and weight percentage: C: 0.10%, Si: 0.30%, Mn: 1.10%, P: 0.012%, S: 0.004% , Nb: 0.048%, Ti: 0.030%, Al: 0.045%, and the balance is Fe and unavoidable impurity elements.

[0042] The production process is as follows: molten iron undergoes converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, controlled rolling cooling, and coiling processes to obtain ultra-thin specification hot-rolled wide strips with a tensile strength of 600MPa ; Among them, the slab heating process, the heating temperature is 1260 ° C, and the heating time is 170 min; the controlled rolling process includes rough rolling, hot coil box coiling, and finish rolling; the rough rolling is 5 rolling, the outlet temperature is 1100 ° C; Coil box coiling, temperature 1090°C for finish rolling, finish rolling is 7-pass rolling, inlet...

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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 ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 陆凤慧周海峰胡德勇包阔张兴利高海
Owner HEBEI IRON AND STEEL
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