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The damaged form of SSAW steel pipe surface
SSAW (Spiral Submerged Arc Welding) steel pipes are protected by a very thin, stable layer of fine chromium-rich oxide film. This protective film prevents oxygen atoms from penetrating the steel, thereby providing oxidation resistance and anti-corrosion properties. However, if this film is damaged, air or liquid oxygen can penetrate, causing the iron atoms to oxidize and leading to surface corrosion. There are several common ways this protective film can be damaged.
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The casing and tubing pipe grades
The API 5CT standard encompasses both seamless and welded casing and tubing pipes used for oil and gas transportation. This article will briefly introduce the casing and tubing pipe grades.
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Carbon seamless steel pipe surface roughness standard
Carbon steel seamless steel pipe (CS SMLS pipe) is manufactured through cold drawing (extrusion) and hot rolling processes. These pipes do not require welding, offering good surface flatness and high dimensional accuracy in both inner and outer diameters. They can withstand high pressure and are widely used in petroleum, chemical, aviation, and light industry sectors.
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Eddy current nondestructive testing method for spiral welded steel pipe
Pipeline transportation is an increasingly crucial method for the efficient transport of oil and gas. In China, large-diameter transportation pipelines predominantly use spiral welded steel pipes due to their mature manufacturing processes and low costs. However, to ensure the reliable operation of these pipelines, it is essential to strictly guarantee the quality of the spiral steel pipes used.
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Cause analysis of LSAW steel pipe surface crack
Surface microcracks in LSAW steel pipes significantly impact product quality, ranging from minor defects to severe issues that can lead to product rejection. These defects are particularly prominent in pipes containing elements like niobium, vanadium, and titanium, which seriously affect product quality and yield rates. The presence of surface microcracks not only results in substantial economic losses for enterprises but also limits the development of plate production lines. Longitudinal surface microcracks, such as edge cracks, longitudinal cracks, and star cracks, arise from several factors, including improper rolling process parameters, abnormal continuous casting processes, inherited slab cracks, and the enrichment of residual elements.
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Large diameter LSAW steel pipe production process
Large Diameter LSAW Steel Pipe refers to a type of pipe used for transporting fluids and gases. "LSAW" stands for Longitudinal Submerged Arc Welding, which is a method of welding used to produce these pipes. Here are the key features and details about large diameter LSAW steel pipe production process.
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Advantages of LSAW steel pipe JCOE forming
Straight seam steel pipes can be categorized into high-frequency straight seam resistance welded pipes (ERW pipes) and submerged arc welded straight seam steel pipes (LSAW steel pipes) based on the production process. Submerged arc welded straight seam steel pipes are further classified into UOE, RBE, JCOE, etc., according to their forming methods. This article will briefly introduce advantages of LSAW steel pipe JCOE forming.
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How to extend the service life of LSAW pipe?
Extending the service life of LSAW (Longitudinal Submerged Arc Welded) pipes involves several strategies focused on protection, maintenance, and proper handling. Here are some effective measures.
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Hot rolled seamless steel pipe production principle
Hot rolled seamless steel pipes are produced through a series of carefully controlled processes that transform a solid round billet into a hollow, seamless tube. The main steps involved in this production process are as follows.
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How to identify whether a steel pipe is welded or seamless?
Seamless steel pipe (SMLS) is a uniform hollow steel pipe without seams, created by heating and perforating a round billet. This process involves stretching and rotating the billet to form a seamless round pipe. In contrast, welded steel pipes are produced by curling steel plates or steel strips and welding the edges together, resulting in weld seams. This article will briefly introduce how to identify whether a steel pipe is welded or seamless.
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