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Gas heating device and integral annealing method for converter shell

A converter shell and gas heating technology, applied in the iron and steel field, can solve the problems of long time consumption and high cost, and achieve the effect of increasing pressure, shortening heating time and reducing cost

Inactive Publication Date: 2015-09-16
PANGANG GRP ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional annealing of the weld seam of the converter shell adopts electric heating annealing. The length of the weld seam of a large converter shell is about 1500 meters. If three electric heaters are prepared and a dedicated power line is set up for heating and annealing, the construction period will also take about 12 days. This traditional electric heating annealing method is time-consuming and costly

Method used

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  • Gas heating device and integral annealing method for converter shell

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Embodiment Construction

[0028] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0029] In the present invention, under the situation not stated to the contrary, the orientation words used such as "up and down" are usually in the direction of gravity, that is, the gas heating device of the converter shell provided by the present invention is defined under normal use conditions, "Inside and outside" refer to inside and outside with respect to the outline of each device or part itself.

[0030] Such as figure 1 As shown, the gas heating device of the converter shell according to the present invention includes a heating pipe 2 and a gas pipe 3 and a compressed air pipe 4 communicated with the heating pipe 2, and the heating pipe 2 is provided ...

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Abstract

The invention relates to a gas heating device of a converter shell. The gas heating device comprises a heating pipe as well as a gas pipe and a compressed air pipe communicated with the heating pipe, wherein a plurality of outward heating holes are formed in the circumference of the heating pipe. The invention further relates to an integral annealing method of the converter shell. The method using the gas heating device of the converter shell to heat the converter shell comprises the following steps: heating the converter shell to 630-650 DEG C, wherein the heating speed is 40-60 DEG C / h at temperature above 300 DEG C; preserving the heat of the converter shell for 3-3.5h at 630-650 DEG C; cooling the converter shell to 300-280 DEG C at a cooling speed of 40-60 DEG C / h; and then, naturally cooling the converter shell to normal temperature. The converter shell heated by the gas heating device is quick to warm, and the operating time and cost can be saved by using the gas heating device to integral annealing of the converter shell.

Description

technical field [0001] The invention relates to the field of iron and steel, in particular to a gas heating device for a converter shell and an integral annealing method for the converter shell. Background technique [0002] The converter shell is a steel structure, and each shell is welded into a whole by welding during installation. For large-scale converters, the thickness of the furnace shell is 80mm-120mm, and the welds are dense. There is a large welding residual stress in the welds of the welded converter shell, which will cause structural deformation and weld cracks, and reduce the efficiency of the converter. Therefore, annealing is usually used to eliminate welding residual stress after the converter shell is assembled. [0003] The traditional annealing of the weld seam of the converter shell adopts electric heating annealing. The length of the weld seam of a large converter shell is about 1500 meters. If three electric heaters are prepared and a dedicated power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D9/00C21D1/52C21C5/46
Inventor 唐志水冯树雄吴荣善涂修利李鹏左饶平宁中余陈梦逢
Owner PANGANG GRP ENG TECH
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