Method for preparing welded stainless steel pipe of boiler

A technology for stainless steel tubes and boilers, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve the problems of lower product qualification rate, difficult quality control, scratches on the inner wall of the tube, etc., to improve the qualification rate, improve the processing process, The effect of improving the quality of the outer surface

Active Publication Date: 2009-10-21
广州永大不锈钢有限公司
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AI Technical Summary

Problems solved by technology

However, in the traditional processing methods of welded stainless steel pipes, it is difficult to ensure efficient processing of qualified stainless steel pipes for boilers. For example, the current welding stainless steel pipes generally adopt the off-line heat treatment process, which has the disadvantages of low work efficiency and difficult quality control; The treatment method for the inner weld bead of the welded stainless steel pipe is realized by using a rotating inner die head, which is easy to cause scratches on the inner wall of the pipe and reduces the qualified rate of the product

Method used

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  • Method for preparing welded stainless steel pipe of boiler
  • Method for preparing welded stainless steel pipe of boiler
  • Method for preparing welded stainless steel pipe of boiler

Examples

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Embodiment 1

[0029] Processing boiler tubes with an outer diameter of 76.2mm and a wall thickness of 1.65mm

[0030] (1) Steel strip unwinding: Select a stainless steel strip coil with a width of 240mm and a thickness of 1.65mm, put it on the uncoiler and uncoil it, and then enter the welding pipe making unit.

[0031] (2) Forming: Utilize the W-forming forming die to form a tubular shape through the forming section, and reserve a straight line weld.

[0032] (3) Welding: The welding torch current is controlled at 200A for continuous welding into tubes.

[0033] (4) Inner bead leveling: Use a fixed inner die to scrape the inner bead level and smooth.

[0034] (5) Grinding of the outer weld bead: Use an automatic grinding device to grind the outer weld bead flat and smooth.

[0035] (6) Heat treatment: in an inert gas environment, heat treatment at a temperature of 1050-1150°C and then rapidly cool.

[0036] (7) Shaping: rounding and straightening of welded stainless steel pipes to meet ...

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Abstract

The invention discloses a method for preparing a welded stainless steel pipe of a boiler, belonging to the technical field of manufacturing the welded stainless steel pipe. The technical scheme includes the processes: strip steel unreeling, molding, welding, internal weld pass leveling, external weld pass polishing, heat treatment, shaping and cutting, wherein the processes are sequentially and continuously carried out, and a bright heat treatment boiler is used for the heat treatment. The welded stainless steel pipe processed by the method of the invention has the advantages of stable quality, lower manufacturing cost and high surface quality, and the method is used for manufacturing pipes for boiler heat exchangers and condensers.

Description

technical field [0001] The invention relates to a preparation method of welded stainless steel pipes, more specifically, it relates to a preparation method of stainless steel pipes for boilers. Background technique [0002] Welded stainless steel pipe is made of stainless steel plate or strip after forming, welding, internal and external bead treatment, annealing heat treatment, shaping and other processes. Compared with seamless stainless steel pipe, welded stainless steel pipe has lower energy consumption per unit and price. has great advantages. Especially in the aspect of welded stainless steel tubes for boiler heat exchangers and condensers, because the consistency of the wall thickness of welded stainless steel tubes and the flatness of the inner surface of steel tubes are easier to control than seamless stainless steel tubes, they have greater market prospects. Become the current fast-growing pipe industry. However, in the traditional processing methods of welded st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B21C37/30C21D9/08B21C25/02B23K9/025B23K37/00B23K37/053
Inventor 曹坤炉
Owner 广州永大不锈钢有限公司
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