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Billet-Heating-Mannesmann piercer-Elongator-Plug mill-Reeler-Reheating-SizerWhen a seamless pipe is made by rolling, the rolling method involves piercing the material while it is being rolled, and is suitable for mass production. The figure shows the manufacturing process used in the Mannesmann plug mill, which is a typical rolling process. The Mannesmann-type piercer reduces the material by rolls that are inclined obliquely to each other. When the round billet is rotated while being compressed in the diametric direction, the central part of the billet becomes loose, which makes it easy to pierce a hole through the center. This is called the Mannesmann effect. The pierced portion is expanded by the elongator, and the wall thickness is then thinned and elongated by the pug mill. The internal and external surfaces are smoothed by the reeler, and the final dimensional adjustments are made by the sizer.

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The micro structure of the metal is what gives the steel its magnetic properties. If the stainless steel chosen was austenitic, e.g. type 316, and a portion of the micro structure were changed to any one of the other four classes then the material would have some magnetic permeability, i.e. magnetism, built into the steel.The micro structure of austenitic stainless steel also changes by a process called martensitic stress induced transformation (MSIT). This is a micro structural change from austenite to martensite and the transformation can occur due to cold working (the process by which many fasteners are made) as well as slow cooling from austenitizing temperatures.  Due to martensite being magnetic, the once nonmagnetic austenitic stainless steel will now have a degree of magnetism.

Longitudinally Submerged Arc Welding Pipe is subdivided into UOE, RBE, JCOE steel pipe according to its different forming methods. Longitudinal high-frequency welded steel pipe has the characteristics of relatively simple process and fast continuous production, and has wide use in civil construction, petrochemical, light industry and other sectors. Mostly used to transport low pressure fluids or made into various engineering components and light industrial products.LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

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But back to magnetism. In the case of steel, whether or not it is magnetic comes down to the microstructure of the steel. Basic stainless steels have what’s known as a “ferritic” structure, which enables them to be magnetic. Remember the chromium content? It’s the addition of chromium that leads to the ferritic structure. This, plus the addition of carbon, hardens the steel and qualifies it as a martensitic steel. Stainless steel knives are typically martensitic.Martensitic steel differs from the most common stainless steels, which are referred to as austenitic. In austenitic steel, there is a higher percentage off chromium, and nickel is also present. In terms of magnetism, it is the addition of nickel that renders the steel non-magnetic. 

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Steel pipes come in many forms and sizes. Seamless pipes are a non-welded option produced from hollowed-out steel billets. When it comes to welded steel pipes, there are three options: ERW, LSAW and SSAW.ERW pipes are made from electric resistance welded steel plates. LSAW pipes are made from longitudinally submerged arc welded steel plates. SSAW pipes are made from spiral submerged arc welded steel plates.Steel pipes are typically used in the oil and gas industry for exploration and extraction (upstream), the transmission of fluids like oil, gas and slurries (midstream) and oil refinement into derivative products (downstream). They are also used for agricultural irrigation, urban construction and more.Let’s take a closer look at each type of pipe, comparing their differences and how to make an order with the right description.

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