Weathering steel hot-rolled thin belt without P segregation and manufacturing method thereof

A manufacturing method and technology of weathering steel, which is applied in the field of alloy steel manufacturing, can solve problems such as difficult control of plate shape, unfavorable transverse toughness and anisotropy of steel, and achieve fewer production processes, lower production costs and labor components, and avoid waste. shape effect

Active Publication Date: 2015-01-28
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Patent No. CN200910048141.X proposes a thin-strip cast-rolled weathering steel production method, the reduction of the hot-rolled thin strip is greater than 30%, and the shape of the strip is difficult to control
[0007] In addition, in traditional thick slab continuous casting, a large number of large-sized MnS inclusions are prone to appear. After hot rolling and large-scale deformation, the sheet-like inclusions remain in the steel plate, which will affect the transverse toughness and anisotropy of the steel. Unfavorable performance, it is easy to form steel plate delamination during later steel plate cutting and use

Method used

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  • Weathering steel hot-rolled thin belt without P segregation and manufacturing method thereof
  • Weathering steel hot-rolled thin belt without P segregation and manufacturing method thereof
  • Weathering steel hot-rolled thin belt without P segregation and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Smelting: Pre-desulfurization of molten iron, compound blowing of converter top and bottom, RH vacuum cycle deoxidation process, calcium treatment and LF refining at the same time, to obtain molten steel with qualified components, by weight percentage: C: 0.08%, Si: 0.30% , Mn: 0.48%, P: 0.08%, S: 0.005%, Cr: 0.60%, Ni: 0.04%, Cu: 0.27%, Al: 0.03%, B: 0.003%, and the balance is iron and impurity elements.

[0061] (2) Thin strip continuous casting: The molten steel with qualified composition is cast and rolled by twin-roll thin strip casting and rolling equipment. With continuous casting. A cast strip with a thickness of 3 mm is obtained.

[0062] (3) Hot rolling: the cast strip is then rolled into a thin strip of 2.6mm through one pass of hot rolling with a reduction of 13%, and the hot rolling temperature is 1050°C.

[0063] (4) Cooling and coiling: the hot-rolled thin strip is cooled to 600°C at a rate of 45°C / s, and the hot-rolled coil is obtained after coilin...

Embodiment 2

[0068] (1) Smelting: Pre-desulfurization of molten iron, top-bottom compound blowing of converter, RH vacuum cycle deoxidation process, calcium treatment and LF refining at the same time, to obtain molten steel with qualified components, by weight percentage: C: 0.07%, Si: 0.33% , Mn: 0.46%, P: 0.09%, S: 0.008%, Cr: 0.80%, Ni: 0.08%, Cu: 0.3%, Al: 0.04%, B: 0.001%, and the balance is iron and impurity elements.

[0069] (2) Thin strip continuous casting: The molten steel with qualified composition is cast and rolled by twin-roll thin strip casting and rolling equipment. With continuous casting. A cast strip having a thickness of 2.0 mm was obtained.

[0070] (3) Hot rolling: the cast strip is then rolled into a thin strip of 1.6mm through one pass of hot rolling with a reduction of 19.9%, and the hot rolling temperature is 950°C.

[0071] (4) Cooling and coiling: the hot-rolled thin strip is cooled to 520°C at a rate of 30°C / s, and the hot-rolled coil is obtained after coili...

Embodiment 3

[0075] (1) Smelting: Pre-desulfurization of molten iron, compound blowing at the top and bottom of converter, RH vacuum cycle deoxidation process, calcium treatment and LF refining at the same time, to obtain molten steel with qualified components, by weight percentage: C: 0.11%, Si: 0.46% , Mn: 0.50%, P: 0.13%, S: 0.005%, Cr: 0.70%, Ni: 0.11%, Cu: 0.4%, Al: 0.03%, B: 0.002%, and the balance is iron and impurity elements.

[0076] (2) Thin strip continuous casting: The molten steel with qualified composition is cast and rolled by twin-roll thin strip casting and rolling equipment. With continuous casting. A cast strip with a thickness of 1.2 mm was obtained.

[0077] (3) Hot rolling: the cast strip is then rolled into a thin strip of 1.14mm by one pass of hot rolling with a reduction of 5%, and the hot rolling temperature is 860°C.

[0078] (4) Cooling and coiling: the hot-rolled thin strip is cooled to 550°C at a rate of 20°C / s, and the hot-rolled coil is obtained after coi...

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Abstract

The invention discloses a weathering steel hot-rolled thin belt without P segregation and a manufacturing method thereof. The weathering steel hot-rolled thin belt comprises the following chemical components in percentage by mass: C: 0.07-0.12%; Si: 0.30-0.50%; Mn: 0.4-0.55%; P: 0.06-0.15%; S: not more than 0.02 % and more than 0; Cr: 0.6-0.8%; Ni: 0.03-0.11%; Cu: 0.2-0.5%; Al: not more than 0.046% and more than 0; B: not more than 0.003% and more than 0, and the balance of iron and impurity elements. The weathering steel hot-rolled thin belt disclosed by the invention is low in cost and free from central P segregation and flaky MnS inclusions.

Description

technical field [0001] The application belongs to the field of alloy steel manufacture, and in particular relates to a hot-rolled thin strip of weathering steel without P segregation and a manufacturing method thereof. Background technique [0002] The weather-resistant steel can be divided into high-weather-resistant steel with a P content of 0.04-0.15 wt%, and weather-resistant steel for welded structures with a P content of less than 0.04 wt%. Since the container is used in the open air and marine climate, etc., and is exposed to corrosive gases for a long time, the weather-resistant steel for containers mainly uses high-P and high-weather resistance weather-resistant steel. [0003] When the traditional thick slab continuous casting and rolling process is used to produce high-P weathering steel, P segregation bands often appear in the thickness center of the steel plate, which affects the formability of the container plate during subsequent use. The central segregation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C33/04C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/18C22C38/40C22C38/42C22C38/54
Inventor 陈爱华汤茜李化龙刘海涛刘俭
Owner SHAGANG GROUP
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