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What is a galvanized steel pipe?

What is a galvanized steel pipe? Galvanized pipe, also known as galvanized steel pipe, is divided into hot-dip galvanizing and electro-galvanizing. The hot-dip galvanizing layer is thick, with uniform plating, strong adhesion and long service life. The cost of electroplating is low, the surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipes. Hot dip galvanized pipe The molten metal is reacted with an iron matrix to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove […]

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What is a welded steel pipe?

What is a welded steel pipe? Welded steel pipe refers to welded steel strip or plate by means of bent round, square and other shapes and then welded into the surface of the steel pipe seam.  Welded steel blanks is used in steel sheet or strip, according to the different welding processes, it can be divided into the furnace pipe, ERW pipes and automatic arc welded pipe. Because of the different forms of welded pipe, which is divided into two and spiral welded pipe. Its shape is divided into round ends welded and shaped (square, flat, etc.) pipe.  Welded steel […]

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10 types of flanges

What are flanges? Flanges are a type of component that is extremely common in engineering design and involves a wide range of surfaces. It is an indispensable part of piping design and pipe fittings, and it is also an essential component in equipment and equipment parts (such as manholes, sight glass level gauges, etc.). In addition, other professional industries such as industrial furnaces, thermal engineering, water supply and drainage, heating and ventilation, automatic control, etc., often use flange joints. Material: Forged steel, WCB carbon steel, stainless steel, 316L, 316, 304L, 304, 321, chromium-molybdenum steel, chromium-molybdenum-vanadium steel, molybdenum-titanium, rubber-lined, lining fluorine […]

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What are black steel pipes?

What are black steel pipes? Black steel pipes are non-galvanized steel pipes. Black steel pipe, its name comes from the scaly, dark-colored iron oxide coating on its surface. It’s used in applications that don’t require galvanized steel. They connected by screwing onto the threaded pipe, after applying a small amount of pipe joint compound on the threads. Larger diameter pipe is welded on rather than threaded. Black steel pipe is cut either with a heavy-duty tube cutter, cut-off saw or by a hacksaw. You can also get Mild Steel ERW Black Pipes that are extensively used for gas distribution inside […]

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Pipe welding procedure

Under the welded steel pipe from the top of the arc, from top to bottom all-position welding technique, the method of welding speed, weld appearance, good welding quality, you can save welding materials, reduce labor intensity, which is a common SMAW can not be compared and now more widely used in large-caliber long-distance pipeline welding in all position of power in the construction of low-welded large diameter thin-walled tube has some promotional value.  Under the welding usually select the appropriate welding current, electrode angle and welding speed, straight through drag down or suppress arcing swing slightly to finish welding. Ordinary […]

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Introduction of ball valves, globe valve

Ball valves The appearance of a ball valve was after the Second World War. Although the invention of a ball valve dates back to the early 20th century, this structural patent failed to complete its commercialization steps due to limitations in the materials industry and the mechanical processing industry. DuPont in the United States invented a high polymer material polytetrafluoroethylene (PTFE) plastic until 1943. This kind of material has advantages of sufficient tensile and compressive strength, certain elastoplasticity, good self-lubricating properties and excellent corrosion resistance, which is very suitable as a sealing material and has very reliable sealing effect. In […]

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Introduction of flange gaskets

Flange gaskets are used for pipe flange connection, they are seals between two flanges. Medium, pressure and temperature directly influence the selection of flange gaskets. 1.Asbestos-packing gasket It is suitable for smooth flange sealing face, concave-convex flange sealing surface and tongue-and-groove sealing face. It’s of good corrosion resistance and thermal stability, good plasticity, and small sealing force to ensure sealing, but with low strength easy to stick on the flange sealing face. It is used in medium pressure valves with high temperature. 2.Metallic gasket There are three main types: Octagonal and elliptical gaskets—suitable for wafer butterfly valves with trapezoidal groove […]

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How to choose valves in the industrial pipeline? (II)

Selection of valves Valves are generally selected according to factors such as characteristics of media, operating conditions and valve requirements. The major Chinese valve manufacturer can manufacture various types of valves according to the above standards to meet the needs of refining and chemical production. Commonly used valves are as follows: Gate valves The wedge disc of the gate valve is driven by the valve stem and moves up and down along the sealing surface of the valve seat to connect or cut off the fluid. The gate valve has small flow resistance and is easy to be opened and […]

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Review and forecast of seamless pipe market in the first half of 2018

After the ups and downs of the price of 17 years, the seamless pipe market mentality in the first half of 18 years was more peaceful, and the overall price showed a rational correction in the shock. The profitability of the pipe factory has shrunk, and traders have been more difficult under the dual pressure of capital and demand. From the middle of the year to the middle of the year, the overall mood of the industry was slightly depressed. The market’s import and export data did not perform well. Many factors affected the market. We review the following aspects: […]

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What are ERW steel pipes

What are ERW steel pipes? ERW steel pipes means Electric Resistance Welded Pipes. ERW steel pipes and tubes are used. ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc. ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes. Manufacturing Process of ERW Pipe Electric resistance welded (ERW) pipe is manufactured by cold-forming a sheet of steel into a cylindrical shape. Current is then passed between the two edges of the steel to heat the steel to a point at which the edges are forced together […]

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