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Manufacturing method of steel longitudinal submerged arc welding steel pipe for high-temperature and high-pressure boiler

A technology for boiler steel and straight seam submerged arc, which is applied in the field of steel manufacturing, can solve the problems of cracks, high strength and hardness, and difficulty in forming, so as to reduce the possibility of unqualified impact, reduce the residence time at high temperature, and eliminate the need for The effect of impacting the possibility of willful failure

Inactive Publication Date: 2012-04-11
上海月月潮管道科技有限公司
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Problems solved by technology

[0005] In order to solve the technical problems of the high-temperature and high-pressure boiler steel in the prior art that the strength and hardness are high, forming is difficult, and cracks are likely to occur after welding, the present invention provides a high-temperature and high-pressure boiler steel straight seam submerged arc welded steel pipe Manufacturing method

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  • Manufacturing method of steel longitudinal submerged arc welding steel pipe for high-temperature and high-pressure boiler
  • Manufacturing method of steel longitudinal submerged arc welding steel pipe for high-temperature and high-pressure boiler

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Embodiment Construction

[0026] 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.

[0027] The manufacturing method of the high-temperature and high-pressure boiler steel of the present invention is used for manufacturing 13MnNiMoR type high-temperature and high-pressure boiler steel pipes. Such as figure 1 As shown, the manufacturing method of steel pipe for high-temperature and high-pressure boiler of the present invention comprises the following steps:

[0028] Step 1: Slitting, vertically cutting a high-strength steel plate;

[0029] Step 2: Edge milling, through a milling process on both sides of the steel plate;

[0030] Step 3: Pre-bending, pre-bending is mainly to eliminate the straight edge of the plate end, first bend the side of the steel plate out of a circular arc, and then use the standard upper die to bend to the circular arc requirements for many times...

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Abstract

The invention discloses a manufacturing method of a steel longitudinal submerged arc welding steel pipe for a high-temperature and high-pressure boiler. The method comprises the following steps of: splitting: vertically cutting a steel plate; edge milling: performing primary milling processing on two side edges of the steel plate; pre-bending to eliminate straight edges at plate ends; bending: initially bending the steel plate into a cylindrical steel plate; forming: forming the cylindrical steel plate into a steel pipe; joint close and pre-welding: performing joint close at the connecting end of the steel pipe; inner welding: welding the inside of the connecting end of the steel pipe; outer welding: welding the outside of the connecting end of the steel pipe; pipe end machining: machining a pipe end flat head of the steel pipe; straightening to reach standard-allowed straightness; finishing: forcedly finishing with an O-shaped mold; end trimming: smoothing the tip of the steel pipe; final detection: detecting the steel pipe; and warehousing: warehousing qualified steel pipes. In the invention, a measure for preventing a longitudinal crack of a welding line comprises controlling the pre-bending roundness and performing pre-finishing in advance before inner welding.

Description

technical field [0001] The invention relates to a method for manufacturing steel, in particular to a method for manufacturing steel pipes for high-temperature and high-pressure boilers. Background technique [0002] With the development of the high-temperature and high-pressure boiler industry, high-pressure and high-pressure boiler steel (especially 13MnNiMoR high-pressure boiler steel) is being used on a large scale in the manufacture of high-temperature and high-pressure boilers. Originally, seamless steel pipes were mainly used. Now our company has developed 13MnNiMoR type steel straight seam submerged arc welded steel pipes for high temperature and high pressure boilers. The cost is lower than that of seamless steel pipes. However, due to the difficulty of manufacturing and welding steel pipes, major design institutes and manufacturers dare not use them easily. In addition, the yield strength of 13MnNiMoR high temperature and high pressure boiler steel (its chemical co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08
Inventor 李友胜
Owner 上海月月潮管道科技有限公司
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