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Method for producing cold-rolled steel strips

A production method and technology of cold-rolled steel strip, applied in metal rolling and other directions, can solve problems such as easy splashing and brittle flux-cored welding wire, and achieve the effects of meeting production requirements, excellent welding quality, and improving welding automation level

Active Publication Date: 2012-04-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the problems of easy brittle fracture in the drawing process and the easy spattering of the produced flux-cored wire when using the existing cooled steel strip to produce flux-cored wire, and to provide a cold-rolled steel strip production method to improve the high drawability of cold-rolled steel strip and the properties of weld metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] After the molten iron is subjected to KR desulfurization treatment, converter dephosphorization-less slag decarburization process, and RH light treatment, continuous casting is performed to obtain slabs. The slab melting chemical composition weight ratio is C: 0.028wt%, Si: 0.01wt%, Mn: 0.19wt%, P: 0.007wt%, S: 0.006wt%, Alt: 0.024wt%, N: 16ppm, O : 33ppm, the balance is basically Fe and other trace elements.

[0054] The slab is heated first. The heating temperature of the slab is 1256℃, the heating time is 3.2 hours, the final rolling temperature is 928℃, the coiling temperature is 722℃, and the thickness of the hot-rolled coil is 2.996×1285mm. The top pickling removes the oxide scale on the surface and enters the 5-stand tandem cold rolling mill to obtain chilled coils with a reduction rate of 73.3%. The chilled coil is finally annealed and leveled in a vertical continuous annealing furnace (leveling elongation is 0.9%), and finally a cold-rolled steel strip for flux-c...

Embodiment 2

[0058] The difference from Example 1 is that the slab smelting chemical composition weight ratio is C: 0.035wt%, Si: 0.02wt%, Mn: 0.28wt%, P: 0.005wt%, S: 0.003wt%, Alt: 0.01wt%, N: 10ppm, O: 20ppm, the balance is basically Fe and other trace elements. The hot rolled coil specification is 3.497×1211mm, the finished product specification is 0.891×1191mm, its yield strength is 184MPa, the tensile strength is 310MPa, and the elongation after fracture is A 80 Is 40.0%. The other parts are completely consistent with Example 1.

Embodiment 3

[0060] The difference from Example 1 is that the slab melting chemical composition weight ratio is C: 0.02wt%, Si: 0.005wt%, Mn: 0.25wt%, P: 0.008wt%, S: 0.003wt%, Alt: 0.02wt%, N: 25ppm, O: 40ppm, the balance is basically Fe and other trace elements. The hot rolled coil specification is 3.495×1475mm, the finished product specification is 0.795×1451mm, its yield strength is 188MPa, the tensile strength is 310MPa, and the elongation after fracture is A 80 It is 40.5%. The other parts are completely consistent with Example 1.

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PUM

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Abstract

The invention discloses a method for producing cold-rolled steel strips. The method comprises the following steps of: performing krypton (KR) desulfurization treatment, converter dephosphorization-less slag decarburization and relative humidity (RH) light treatment on molten iron, and performing continuous casting to obtain a high-purity plate blank; heating the plate blank, performing rough rolling and precision rolling to obtain a hot-rolled plate, cooling the hot-rolled plate and coiling the hot-rolled plate into a hot-rolled coil; and performing cold rolling, annealing and flattening on the hot-rolled coil, and coiling the hot-rolled coil into a finished product. By the method for producing the cold-rolled steel strips, the cold-rolled steel strips which have high drawing property and good welding performance and can be used for flux-cored wires can be produced, the production requirement of the flux-cored wires is met, splash in the welding process is reduced, seams with good welding quality are obtained, and the automation level of welding is improved.

Description

Technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for producing cold rolled steel strips. Background technique [0002] Flux-cored welding wire is a kind of welding wire made from thin steel strips rolled into round steel pipes or special-shaped steel pipes, filled with a certain composition of powder, and formed by drawing. It can be made by adding gas protection, flux protection or self-protection. Perform welding. Flux-cored welding wire is the current development direction, especially in welding high-strength structural steel, low-temperature steel, heat-resistant steel, stainless steel and wear-resistant surfacing. [0003] In recent years, energy conservation, emission reduction, and environmental protection are important indicators for the development of the national economy, and the welding industry has always been one of the industries with high pollution. Improving the working conditions of welders and reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B1/46C22C38/06C22C38/04C21D8/02
Inventor 阳代军张召恩朱立新黄来情李永林方圆高圣勇王文广赵运堂庞在刚艾矫健周建
Owner SHOUGANG CORPORATION
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