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Production method of thick-specification steel S355G11M hot rolled coil for seaside building structure

A technology of S355G11M steel for building structures, applied in the field of steel production and manufacturing, can solve the problems of steel weldability, poor formability, insufficient equipment utilization, long rolling cycle time, etc., to achieve reduced rolling time, low cost, and improved The effect of production efficiency

Inactive Publication Date: 2021-04-23
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional S355G11M is produced by a medium and heavy plate rolling mill. Due to insufficient equipment utilization in the rough rolling stage, the rolling cycle time of each piece of steel is too long, resulting in low production capacity and high energy consumption. At the same time, the weldability and formability of the steel produced Poor, does not have good plasticity

Method used

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  • Production method of thick-specification steel S355G11M hot rolled coil for seaside building structure
  • Production method of thick-specification steel S355G11M hot rolled coil for seaside building structure
  • Production method of thick-specification steel S355G11M hot rolled coil for seaside building structure

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Experimental program
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Effect test

Embodiment

[0036] The preparation of S355G11M hot-rolled coils is carried out as follows:

[0037] 1) Hot metal pretreatment: pretreat the hot metal, the hot metal pretreatment requires S ≤ 0.0050%, and carry out slag removal treatment;

[0038] 2) Converter: All ladles are preheated and heated to reduce fluctuations in molten steel temperature drop, improve the cleanliness of the ladle, make the ladle clean without residual steel and residue, ensure the air permeability and self-pouring of the ladle, and feed calcium when the ladle is in use. During the decarburization process of the converter, oxygen blowing is only performed once to avoid secondary point blowing of oxygen to reduce carbon. Low-carbon and low-phosphorus ferromanganese and ferrosilicon are used for tapping. , to avoid scattered flow, the aluminum content of the ladle is controlled by 0.005-0.020%, and at the same time, the ladle N≤25ppm is required, the slag is blocked and the steel is tapped, and the amount of slag ent...

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Abstract

The invention provides a production method of a thick steel S355G11M hot rolled coil for a seaside building structure. According to the method, in the chemical composition and production process design of an FTSR production line S355G11M, a Cr-Nb-Ti composite strengthening means is adopted for replacing precious alloys such as Mo, Ni and V, and a hot continuous rolling unit for producing a hot-rolled coil plate is used for replacing a medium plate production mode of a traditional reversible rolling mill; and the hot-rolled coiled plate produced by the hot continuous rolling unit is used for replacing a medium-thickness plate with the same thickness specification, so that the purposes of improving the production efficiency and reducing the cost are achieved while high strength and good toughness are achieved.

Description

technical field [0001] The invention relates to the field of steel production and manufacturing, in particular to a production method of thick gauge steel S355G11M hot-rolled coils for seaside building structures. Background technique [0002] S355G11M steel is a weldable structural steel used to manufacture offshore structures. The products are exported to Southeast Asian countries and regions such as the Philippines and Malaysia. The steel has the characteristics of high strength, good toughness, good formability and good welding performance. The traditional steel S355G11M used for seaside building structures is produced by medium and heavy plate rolling mills, the thickness is usually 20mm and above, and off-line or on-line heat treatment is required after rolling. [0003] The traditional S355G11M is produced by a medium and heavy plate rolling mill. Due to insufficient equipment utilization in the rough rolling stage, the rolling cycle time of each piece of steel is too...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C22C38/42C21C5/28C21D8/02C22C33/04C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
CPCC21C5/28C21D8/0205C21D8/0226C21D8/0263C21D8/0278C22C33/04C22C38/02C22C38/04C22C38/06C22C38/20C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C22C38/42C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 韩宇文小明吴刚王旭生徐勇王全洲苗隽许学利孙峥
Owner BENGANG STEEL PLATES
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