Manufacturing method of high temperature and high pressure steel pipe

A high temperature and high pressure, manufacturing method technology, applied in the direction of manufacturing tools, arc welding equipment, welding equipment, etc., can solve problems such as cracks, and achieve the effect of reducing high temperature residence time and eliminating the possibility of welding cracks

Inactive Publication Date: 2011-12-28
上海月月潮管道科技有限公司
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Problems solved by technology

[0003] In order to solve the technical problem of high temperature and high pressure pipes in the prior art, which are very likely to produce cracks after welding under high temperature and high pressure, the present invention provides a manufacturing method of high temperature and high pressure steel pipes

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  • Manufacturing method of high temperature and high pressure steel pipe
  • Manufacturing method of high temperature and high pressure steel pipe

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Embodiment Construction

[0027] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

[0028] The method for manufacturing high-temperature and high-pressure steel pipes of the present invention is used for manufacturing high-temperature and high-pressure steel pipes made of ASTMA387.CL22.2. like figure 1 As shown, the manufacturing method of high temperature and high pressure steel pipe of the present invention comprises the following steps:

[0029] Step 1: Slitting, vertically cutting the steel plate;

[0030] Step 2: Edge milling, through a milling process on both sides of the steel plate;

[0031] Step 3: Pre-bending. Pre-bending is mainly to eliminate the straight edge of the plate end and bend the side of the plate into a circular arc.

[0032] Step 4: Bending, the steel plate is preliminarily folded into a cylindrical shape; focus on controlling the bending roun...

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Abstract

The invention discloses a method for manufacturing a high-temperature and high-pressure steel pipe, which comprises the following steps: strip opening; edge milling; pre-bending, which eliminates the straight edge of the plate end; bending; forming; The end of the steel pipe is welded; the internal welding is used to weld the inside of the connecting end of the steel pipe; the external welding is used to weld the outside of the connecting end of the steel pipe; the pipe end processing is to process the flat end of the steel pipe end; straightening requires The straightness allowed by the standard can only be achieved after straightening; finishing, forced precise shaping with an O-shaped mold; flaw detection; heat treatment of the whole steel pipe after passing the flaw detection; re-straightening and finishing; trimming, so that the end of the steel pipe is smooth; finally Testing, testing the steel pipes; warehousing, the steel pipes are put into storage after passing the test. The main technical measures of the present invention to prevent quenching in the heat-affected zone are to use small welding energy, reduce the high-temperature residence time, and perform heat treatment after welding, thereby greatly reducing and eliminating the possibility of welding cracks.

Description

technical field [0001] The invention relates to a method for manufacturing a high-temperature and high-pressure steel pipe, in particular to a method for manufacturing a steel pipe of ASTMA387Gr.22CL.2 steel. Background technique [0002] With the development of high-temperature and high-pressure pressure vessels in China, high-temperature and high-pressure steel pipes (especially ASTMA387Gr.22CL.2 high-temperature and high-pressure pipes) are being used in pressure vessels. The material standard is the American Boiler and Pressure Vessel Specification. Because the steel pipe needs to be resistant to high temperature and high pressure, it has high requirements on materials and welding. At present, this kind of steel pipe in my country is mainly imported from South Korea and Italy; in addition, the high temperature and high pressure steel pipe made of ASTMA387.CL22.2 Yield strength ≥ 310Mpa, tensile strength 515-690Mpa. Although the strength and hardness are not high, cracks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K9/18
Inventor 周志吉李友胜
Owner 上海月月潮管道科技有限公司
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