Glass-lined anti-corrosion steel pipe producing and welding processes

An anti-corrosion steel pipe and a manufacturing process technology, applied in the field of steel pipe manufacturing, can solve the problems of poor anti-corrosion effect and short service life, and achieve the effects of smooth inner wall, small fluid resistance and high chemical stability

Inactive Publication Date: 2014-05-28
胜利油田金岛工程安装有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a manufacturing process of glass-lined anti-corrosion steel pipes to solve the defects of poor anti-corrosion effect and short service life of existing steel pipes

Method used

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  • Glass-lined anti-corrosion steel pipe producing and welding processes
  • Glass-lined anti-corrosion steel pipe producing and welding processes
  • Glass-lined anti-corrosion steel pipe producing and welding processes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 , firstly provide a manufacturing process of glass-lined anti-corrosion steel pipe, including the following steps:

[0034] (1) Use an automatic surfacing welding machine to pre-surfacing a nickel-based corrosion-resistant alloy layer 1.3 on the end face of the steel pipe 1.1 to a depth of 30-50 mm, with a thickness of 1.5-2 mm, and melt it on the base material to obtain a pipe The corrosion resistance of the surfacing layer;

[0035] (2) Bevel the end face of the steel pipe for surfacing pretreatment, and use an inner hole grinder to polish the surface of the nickel-based surfacing layer;

[0036] (3) The inner wall of the steel pipe is derusted by shot peening and derusting equipment on the inner wall of the steel pipe, which is required to meet the Sa2.5 level; the inner wall of the steel pipe after derusting is purged and dust-removed with dry and clean compressed air, and no steel sand and steel shots are required. , no ups and downs;

[0037] (4) T...

Embodiment 2

[0043] see Figure 1-3 , on the basis of Example 1, keep other steps and device structure unchanged, only change steps (1) and (2) to the following steps respectively:

[0044] (1) Welded stainless steel joints at both ends of the steel pipe: use 304 and above grade stainless steel pipe pre-processed joints with the same outer diameter and wall thickness as the processed steel pipe with good corrosion resistance (the length of the short joint conforms to GB50235-2010 "Industrial Metal Pipeline Construction "Specification" requirements); use friction welding or manual arc welding to weld the stainless steel joints to both ends of the steel pipe.

[0045] (2) Clean and polish the weld seam of the steel pipe welded with stainless steel joints, and the weld seam of the inner hole is required to be smooth.

Embodiment 3

[0047] The glass-lined anticorrosion steel pipes made in Examples 1 and 2 are welded in the following manner:

[0048] During butt welding construction of the on-site pipeline group, the double-sided shielded welding of the nickel-based stainless steel wire tungsten argon arc welding corresponding to the nickel-based corrosion-resistant alloy layer 1.3 (the nickel-based corrosion-resistant layer 1.4), and then filled with nickel-based stainless steel welding wire (nickel-based stainless steel welding wire is preferably AWS A5.14 ERNiCrMo-3) or an electrode with corresponding corrosion resistance (forming filling layer 1.5), so that the nickel-based surfacing layer and The base metal and the solder form a metallurgical combination to ensure the welding quality, and at the same time, a continuous layer of nickel-based alloy anti-corrosion protection layer is formed on the surface of the inner hole of the weld, which solves the problem of anti-corrosion on the inner surface of the...

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Abstract

The invention relates to a glass-lined anti-corrosion steel pipe producing and welding processes. The producing process includes pre-overlaying a nickel-based corrosion resistant alloy layer from 1.5 to 2 mm in inner holes with depth of 30 to 50 mm to the end face of a steel pipe, allowing the nickel-based corrosion resistant alloy layer to fuse on the base material; beveling the overlaid-preprocessed end face of the steel pipe, and smoothly polishing the surface of the nickel-based overlaying layer; performing rust removal and dust treatment on the inner wall of the steel pipe; coating glass powder on the inner wall of the steel pipe in a hot spraying manner to melt and form an inner glass corrosion resistant layer. By coating the inner glass corrosion resistant layer on the inner wall of a metal pipe in a hot melting manner, a glass and metal composite corrosion resistant structure is formed, chemical stability is high, the inner wall is smooth, and fluid resistance is small; the glass-lined anti-corrosion steel pipe has special advantages of corrosion resistance, waxing resistance, wear resistance, resistance reduction and energy efficiency, and can be widely applied in various fields of petroleum, chemical industry, natural gas, tap water, sewage, municipal construction and the like.

Description

technical field [0001] The invention relates to the field of steel pipe manufacturing, in particular to a manufacturing process and welding process of a glass-lined anti-corrosion steel pipe. Background technique [0002] Improving pipeline anti-corrosion technology and prolonging the service life of pipelines is one of the global technical difficulties. At present, the anticorrosion materials for metal pipelines commonly used in countries all over the world are organic polymer compounds, such as coal tar coatings, asphalt, epoxy coatings, 3-layer PE coatings, etc. Due to the existence of aging and deterioration problems, the service life of pipes coated with traditional organic coatings is shortened to varying degrees. This inherent deficiency of organic coatings often leads to catastrophic pipeline accidents (such as leaks, fires, explosions and environmental pollution), which can be described as endless troubles. Therefore, how to improve the anti-corrosion performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/14C23C24/10B23K9/167
CPCB05D7/222B05D7/24B23K9/167F16L58/14F16L58/181
Inventor 梁龙旭蒲宝林陈辉高生伟盖发宾李传明
Owner 胜利油田金岛工程安装有限责任公司
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