Method for producing 700Mpa V-N microalloyed high-strength air corrosion-resistant steel based on sheet bar continuous casting tandem rolling process

A thin slab continuous casting and microalloying technology, applied in metal rolling, temperature control, etc., to achieve the effect of microstructure, high formability, and fast cooling speed

Inactive Publication Date: 2006-12-27
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Based on the thin slab continuous casting and rolling process, the new composition design and process of using V-N microalloying technology to produce high-strength weather-resistant steel plates with a yield strength of 700 MPa or more have not been reported at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Thin slab continuous casting and rolling process is as follows: electric furnace or converter smelting, refining, thin slab continuous casting, casting slabs solidified and directly enter the roller hearth heating or soaking furnace, hot rolling, laminar cooling, coiling.

[0020] The chemical composition range of molten steel is: 0.04~0.05%C-0.25~0.5%Si-0.8~1.4%Mn-0.07~0.09%P-0.005~0.010%S-0.25~0.29%Cu-0.15~0.20%Ni-0.4 ~0.5%Cr-0.15~0.20%V-0.020~0.030%Alt-0.020~0.030%N.

[0021] Thin slab continuous casting and rolling process parameters are: billet entering furnace temperature 900-1000℃; soaking temperature 1030-1150℃; starting rolling temperature 1050-1100℃; finishing rolling temperature 830-880℃; ℃.

[0022] The grain size and mechanical properties of the steel strip are shown in Table 2.

[0023] Strip thickness

Embodiment 2

[0025] Thin slab continuous casting and rolling process is as follows: electric furnace or converter smelting, refining, thin slab continuous casting, casting slabs solidified and directly enter the roller hearth heating or soaking furnace, hot rolling, laminar cooling, coiling.

[0026] The chemical composition range of molten steel is: 0.05~0.06%C-0.4~0.5%Si-1.4~1.6%Mn-0.07~0.09%P-0.005~0.010%S-0.25~0.29%Cu-0.15~0.20%Ni-0.4 ~0.5%Cr-0.12~0.14%V-0.020-0.030%Alt-0.015~0.025%N.

[0027] Thin slab continuous casting and rolling process parameters are: billet entering furnace temperature 980~1050℃; soaking temperature 1100~1150℃; starting rolling temperature 1000~1080℃; final rolling temperature 830~860℃; ℃.

[0028] The grain size and mechanical properties of the steel strip are shown in Table 3.

[0029] Strip thickness

Embodiment 3

[0031] Thin slab continuous casting and rolling process is as follows: electric furnace or converter smelting, refining, thin slab continuous casting, casting slabs solidified and directly enter the roller hearth heating or soaking furnace, hot rolling, laminar cooling, coiling.

[0032] The chemical composition range of molten steel is: 0.05~0.08%C-0.4~0.5%Si-0.8~1.2%Mn-0.07~0.09%P-0.005~0.010%S-0.25~0.29%Cu-0.15~0.20%Ni-0.4 ~0.5%Cr-0.12~0.14%V-0.020-0.030%Alt-0.020~0.030%N.

[0033] Thin slab continuous casting and rolling process parameters are: billet entering furnace temperature 900-1000°C; soaking temperature 1120-1200°C; starting rolling temperature 1050-1120°C; ℃.

[0034] The grain size and mechanical properties of the steel strip are shown in Table 4.

[0035] Strip thickness

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Abstract

This invention exposed the producing method of V-N microalloyed high strength weathering steel which produced with near net shape con-casting technology. It is smelted in electric furnace or converter, refined, con-casted, casted, then directly sent into roller hearth furnace or soaking pit, hot-rolled, laminar cooled, coiled. The liquid steel's chemical elements are (Wt.%): C: <=0.08%, Si: 0.25- 0.75%, Mn: 0.8-2.0%, P: 0.070-0.150%, S: <=0.040%, Cu: 0.25-0.60 %, Cr: 0.30-1.25 wt%, Ni: <=0.65%, V: 0.05-0.20%, N: 0.015-0.030%. This invention can get the high intensity, formation, weathering, joining character stably. The alloying cost is relatively low. So it can be used to produce container, carriage, and other industry facility.

Description

technical field [0001] The invention relates to the technical field of low-alloy steel production, in particular to a method for producing 700MPa-level V-N microalloyed high-strength atmospheric corrosion-resistant steel based on a thin slab continuous casting and rolling process. Background technique [0002] High-strength atmospheric corrosion-resistant steel refers to σ s ≥450MPa weathering steel, this type of steel is mainly used in the manufacture of special containers, bridges and high-speed train carriages, which play an important role in reducing weight, increasing speed, increasing freight volume, prolonging the service life of equipment and reducing logistics costs. Since high-strength weathering steel requires high corrosion resistance and high strength level, good formability and welding performance, it requires a high level of metallurgical process and equipment control. [0003] Abroad, the United States first successfully developed Cor-tenA atmospheric corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C33/04B21B1/46B21B37/74B22D11/16
Inventor 毛新平高吉祥林振源陈麒琳李春艳刘义军谢劲松张国广严旭昌
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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