A kind of sour environment carbon steel pipeline welding method
A welding method and carbon steel technology, applied in welding equipment, welding medium, welding equipment, etc., can solve problems such as cracking, affecting the purity of welds, and sulfide corrosion cracking
Active Publication Date: 2022-01-18
SICHUAN GASOLINEEUM CONSTR ENG
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Problems solved by technology
For example, the purpose of the present invention is to solve the problem of high strength and high hardness of the weld seam after welding of acidic carbon steel pipelines, which leads to the problem that the weld seam is easily corroded and cracked due to SSC sensitivity; , resulting in hydrogen embrittlement of welds and hydrogen-induced cracking; solve the problem of sulfide stress corrosion cracking induced by hydrogen sulfide-containing medium due to local tensile stress after welding of acidic carbon steel pipes due to local stress concentration or residual stress concentration ; Solve the problem that the content of S, P, and O in the weld structure of the acidic carbon steel pipeline is high, and the inclusions such as oxides and sulfides will seriously affect the purity of the weld and lead to the decrease of the toughness of the weld
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[0022] Hereinafter, a method for welding a carbon steel pipeline in an acidic environment according to the present invention will be described in detail with reference to exemplary embodiments.
[0023] The present invention provides a carbon steel pipeline welding method in an acidic environment. In an exemplary embodiment of the carbon steel pipeline welding method in an acidic environment according to the present invention, the welding method may include:
[0024] Step S01, controlling the chemical composition of the mother pipe, and performing bevel processing and assembly on the mother pipe.
[0025] In order to improve the ability of acid carbon steel to resist hydrogen sulfide corrosion, increase the service life of pipelines and reduce maintenance, it is necessary to control the chemical composition of the parent pipe. The chemical composition of the mother pipe can be: C≤0.14%, Si≤0.40%, Mn≤1.35%, P≤0.002%, S≤0.003%, Cu≤0.20%, Ni≤0.30%, Cr ≤0.30%, Mo≤0.15%, Al≤0.060%...
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Abstract
The invention provides a carbon steel pipeline welding method in acidic environment. The method includes: controlling the chemical composition of the mother pipe, performing groove processing and pairing on the mother pipe; preheating the welding joint of the mother pipe after grouping; performing root welding on the preheated welding joint by using Class I welding consumables and heat welding; use II type welding consumables for filling welding and cover welding of the welding joint; after non-destructive testing, perform post-weld heat treatment to complete the welding. According to the method of the present invention, the problem of high strength and high hardness of the weld seam after welding the acidic carbon steel pipeline can be solved, which causes the weld seam to be easily corroded and cracked due to SSC sensitivity; it can solve the problem of local stress concentration or residual stress concentration after the acidic carbon steel pipeline is welded And produce local tensile stress, induce the problem of sulfide stress corrosion cracking under the action of hydrogen sulfide-containing medium; it can solve the problem of high S, P, O content in the weld structure of acidic carbon steel pipeline after welding, resulting in oxides, sulfides, etc. Inclusions seriously affect the purity of the weld and lead to a decrease in the toughness of the weld.
Description
technical field [0001] The invention belongs to the field of welding technology, and more specifically relates to a welding method for improving the hydrogen sulfide corrosion resistance of carbon steel pipelines by controlling welding materials, welding processes and post-welding heat treatment. Background technique [0002] In the petroleum and chemical industries, carbon steel equipment is mostly used in the production equipment for processing medium containing hydrogen sulfide. However, carbon steel equipment is easily damaged by hydrogen sulfide corrosion, which will lead to the situation of being forced to stop production for maintenance. Very unfavorable. For a long time, there has been no unified technical requirement for welding methods for carbon steel pipelines in sour oil and natural gas environments, and there are no mature cases of welding sulfur-resistant carbon steel pipelines in China. [0003] Therefore, there is an urgent need to meet the requirements of ...
Claims
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IPC IPC(8): B23K9/16B23K9/235B23K35/30
CPCB23K9/16B23K9/235B23K35/3026
Inventor 张城李阳余尚林李翔杜和杨燕张圆肖景安黄勇
Owner SICHUAN GASOLINEEUM CONSTR ENG