Cold rolled coil strapping steel having tensile strength of 940MPa or more, and production method thereof

A technology with a tensile strength of 940mpa, applied in the field of strapping steel for cold-rolled coils and its production, can solve the problems of rising raw material costs, complicated operations, and easy damage to machines, and achieves low cost, simple operation, energy consumption and pollution. small effect

Inactive Publication Date: 2013-10-16
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings are: the addition of alloy element Nb, and the low content of Si, P, and S, which increases the cost of smelting. At the same time, the process operation is complicated, the energy consumption is large, and the toxic heavy metal element Pb is involved, which seriously pollutes the environment. Not suitable for widespread promotion
Using two-phase zone quenching + tempering process, the tensile strength is 1280~1

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] The chemical composition of the hot-rolled sheet raw material is as follows: C: 0.11%, Mn: 1.35%, Si: 0.019%, P: 0.015%, S: 0.004%, Als: 0.04%, and the rest are Fe and residual elements.

[0039] The dimensions of the hot-rolled steel plate are as follows: thickness is 3.0 mm, width is 1295 mm; mechanical properties are as follows: tensile strength is 590 MPa, elongation is 27%; It is divided into two parts with widths of 844 mm and 451 mm, of which the 844 mm part is used as the raw material plate of the painted strip, and is produced by 9-pass rolling; the distribution of rolling passes from 1 to 9 is as follows: 3.0→2.64 →2.35→1.97→1.76→1.53→1.24→1.10→0.95→0.8 mm, the total reduction rate is 73.3%, the tensile strength of the cold-rolled raw material is 1000 MPa, the elongation is 6%, and the number of repeated bending is 4 ( R=2.5 mm), there is no brittle fracture and delamination, the bending degree is ≤25.4 mm / 2.4 m, the camber bending is ≤2.0 ...

Example Embodiment

[0041] Example 2

[0042] The chemical composition of the hot-rolled sheet raw material is as follows: C: 0.12%, Mn: 1.25%, Si: 0.013%, P: 0.015%, S: 0.004%, Als: 0.043%, and the rest are Fe and residual elements.

[0043] The dimensions of the hot-rolled steel sheet are as follows: thickness is 2.9 mm, width is 1295 mm; mechanical properties are as follows: tensile strength is 590 MPa, elongation is 27%; It is divided into two parts with widths of 844 mm and 451 mm, of which the 451 mm part is used as the raw material plate for the blue ribbon, and is produced by 9-pass rolling. The distribution of rolling passes from 1 to 9 is as follows: 2.9→ 2.64→2.35→1.97→1.76→1.53→1.24→1.10→0.95→0.8 mm, the total reduction rate is 72.4%; the tensile strength of the cold-rolled raw material is 1000 MPa, and the elongation is 6%. The number of repeated bending is 4 times (R=2.5 mm), there is no brittle fracture and delamination, the bending degree is less than or equal to 25.4 mm / 2.4 m, t...

Example Embodiment

[0045] Example 3

[0046] The chemical composition of the hot-rolled sheet raw material is as follows: C: 0.17%, Mn: 1.48%, Si: 0.024%, P: 0.018%, S: 0.003%, Als: 0.037%, and the rest are Fe and residual elements.

[0047] The dimensions of the hot-rolled steel sheet are as follows: thickness of 3.1 mm and width of 1295 mm. The mechanical properties are as follows: the tensile strength is 600 MPa, and the elongation is 26%; according to the equipment characteristics of the 1050 mm rolling mill, set as required, the hot-rolled sheets are cut before cold rolling, and the widths are 844 mm and 451 mm respectively. mm two parts, of which the 844 mm part is used as the raw material plate of the painted strip, and is produced by rolling in 9 passes; the distribution of rolling passes from 1 to 9 is as follows: 3.1→2.64→2.35→1.97→1.76→1.53→1.24→ 1.10→0.95→0.79 mm, the total reduction rate is 74.5%; the tensile strength of the cold-rolled raw material is 990 MPa, the elongation is 6%...

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Abstract

Cold rolled coil strapping steel having a tensile strength of 940MPa or more comprises 0.10-0.22wt% of C, 0.8-1.5wt% of Mn, 0.01-0.03wt% of Si, 0.020wt% or less of P, 0.020wt% or less of S, 0.020-0.070wt% of Als, and the balance Fe and residual elements. The cold rolled coil strapping steel has the advantages of no containment of alloy elements comprising Nb, Ti or V, low cost, small energy consumption and pollution, simple operation, and suitableness for the large-batch industrial production, and follows low carbon and environmental protection ideas. The strapping steel has a tensile strength of 940MPa or more, an elongation rate of 9% or more, and an alternating bending frequency of 4 or more (R=2.5mm), has no brittle fracture layering phenomenon, and has a flexibility of 25.4mm/2.4m or less and a camber of 2.0mm/m or less.

Description

technical field [0001] The invention relates to a strapping steel and a production method thereof, in particular to a strapping steel for cold-rolled coils with a tensile strength ≥ 940 MPa and a production method thereof. Background technique [0002] In order to ensure the safe storage and transportation of cold-rolled products, improve product quality, and reduce the scrap rate caused by packaging, the quality of strapping for cold-rolled coils is very critical. In addition to the requirement of tensile strength not less than 940 MPa, elongation not less than 9%, repeated bending times not less than 4 times (R=2.5 mm), it must also have good corrosion resistance or welding performance. [0003] At present, the raw materials for producing high-strength strapping at home and abroad are mainly low-alloy steel, alloy structural steel and high-quality carbon structural steel. The production processes mainly include annealing after cold rolling strengthening, lead bath isotherm...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/02B65D63/02
CPCY02P10/20
Inventor 黄菲陶军晖张兆丽何振华吴远东王丹
Owner 武汉钢铁有限公司
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