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Production method of steel pipe

A production method and technology for steel pipes, which are applied to the improvement of process efficiency, furnace types, furnaces, etc., can solve the problems affecting the production quality of plastic-lined steel pipes and the wrinkles of plastic pipes.

Active Publication Date: 2020-05-29
SHANGHAI BAOLUO STAINLESS STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When producing plastic-lined steel pipes, it is necessary to coat a layer of hot melt adhesive on the outer wall of polyethylene pipes. The melting point of hot melt adhesive is 120°C, and the melting point of polyethylene is about 120°C to 125°C. Hot melt adhesive and The melting point and softening point of polyethylene are relatively close. Most of the existing plastic-lined steel pipes are produced by electromagnetic induction heating technology in the production process, but when the inner wall of the steel pipe is heated until the hot melt adhesive melts When the temperature is high, the polyethylene pipe will also soften due to heating, which makes the polyethylene pipe easy to flow due to pressure, so that wrinkles appear on the inner wall of the plastic pipe, which affects the production quality of the plastic-lined steel pipe.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment one: a kind of production method of steel pipe, comprises the following steps:

[0035] a. Material selection and shearing: select the appropriate steel according to the requirements of the steel pipes that need to be produced, and then roll the selected steel into coils by hot rolling, and then use the shearing machine on standby to produce the hot-rolled coils as required Cut to the appropriate size;

[0036] b. Cold rolling forming: Send the steel plate cut into a specified size into the roll forming machine for rolling, and roll the steel strip 360° to form a rough steel pipe; in the process of rolling the steel strip by using the roll forming machine Spray lubricating oil on the surface of the steel strip to prevent the surface from wrinkling due to high friction during the rolling process of the steel strip;

[0037] c. Degreasing: A large amount of lubricating oil is attached to the inner and outer surfaces of the rolled rough steel pipe. The exist...

Embodiment 2

[0047] Embodiment two: a kind of production method of steel pipe, comprises the following steps:

[0048] a. Material selection and shearing: select the appropriate steel according to the requirements of the steel pipes that need to be produced, and then roll the selected steel into coils by hot rolling, and then use the shearing machine on standby to produce the hot-rolled coils as required Cut to the appropriate size;

[0049] b. Cold rolling forming: Send the steel plate cut into a specified size into the roll forming machine for rolling, and roll the steel strip 360° to form a rough steel pipe; in the process of rolling the steel strip by using the roll forming machine Spray lubricating oil on the surface of the steel strip to prevent the surface from wrinkling due to high friction during the rolling process of the steel strip;

[0050] c. Degreasing: A large amount of lubricating oil is attached to the inner and outer surfaces of the rolled rough steel pipe. The exist...

Embodiment 3

[0060] Embodiment three: a kind of production method of steel pipe, comprises the following steps:

[0061] a. Material selection and shearing: select the appropriate steel according to the requirements of the steel pipes that need to be produced, and then roll the selected steel into coils by hot rolling, and then use the shearing machine on standby to produce the hot-rolled coils as required Cut to the appropriate size;

[0062] b. Cold rolling forming: Send the steel plate cut into a specified size into the roll forming machine for rolling, and roll the steel strip 360° to form a rough steel pipe; in the process of rolling the steel strip by using the roll forming machine Spray lubricating oil on the surface of the steel strip to prevent the surface from wrinkling due to high friction during the rolling process of the steel strip;

[0063] c. Degreasing: A large amount of lubricating oil is attached to the inner and outer surfaces of the rolled rough steel pipe. The exi...

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Abstract

The invention discloses a copper pipe production method and relates to the technical field of copper pipe production. The problem that the inner sides of plastic pipes in existing plastic-lined steelpipes are prone to being wrinkled is solved. The technical scheme of the steel pipe production method comprises the following steps including a, steel selection and shearing; b, cold rolling forming;c, pipe seam welding; d, weld seam treatment; e, weld seam detecting; f, heat treatment; g, hot melt adhesive coating; h, pipe pressurizing sealing; i, heating; and j, gas exhausting. When a steel pipe is heated, the inner wall of a polyethylene pipe is cooled in a water mist spray mode, accordingly, the inner wall of the polyethylene pipe is not prone to softening, accordingly, flowing is not prone to occurring, and therefore, the inner wall of the polyethylene pipe is not prone to being wrinkled.

Description

technical field [0001] The invention relates to the technical field of steel pipe production, more specifically, it relates to a production method of steel pipes. Background technique [0002] Plastic-lined steel pipe is a kind of steel pipe. In the production of plastic-lined steel pipe, galvanized seamless steel pipe or welded steel pipe is mostly used as the base pipe. After removing the welding ribs on the inner wall of the steel pipe, lining the inner wall of the steel pipe The food-grade polyethylene pipe with the same inner diameter as the steel pipe is bonded to the inner wall of the steel pipe after a certain period of time by pressurization and heating. The plastic-lined steel pipe is an upgraded product of the existing steel pipe. [0003] When producing plastic-lined steel pipes, it is necessary to coat a layer of hot melt adhesive on the outer wall of polyethylene pipes. The melting point of hot melt adhesive is 120°C, and the melting point of polyethylene is ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/08B29C65/52C21D9/08C21D1/42C23G1/08C23G3/04
CPCB21C37/08B29C65/52B29C66/032B29C66/5221B29C66/74283C21D1/42C21D9/08C23G1/088C23G3/04Y02P10/25
Inventor 余泽郭士荣
Owner SHANGHAI BAOLUO STAINLESS STEEL TUBE