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Seamless Steel Pipe

Seamless Steel Pipe Manufacturing Process

by permanent6 days ago

The raw material for rolling the seamless steel pipe is a round tube blank, and the round tube blank is cut into a blank having a length of about 1 m by a cutting machine, and sent to a furnace for heating via a conveyor belt. The billet is fed into a furnace and heated to a temperature of approximately 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a key issue. After the round billet is released, it is subjected to a through-hole punching machine.

The more common perforating machine is a conical roller punching machine. This perforating machine has high production efficiency, good product quality, large diameter of perforation and can wear a variety of steel types. After perforation, the round billet is successively rolled, rolled or extruded by three rolls. After extrusion, the tube should be sizing.

The sizing machine is rotated at a high speed by a conical drill bit into a steel core to form a steel pipe. The inner diameter of the steel pi

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The Difference Between Welded Pipe And Seamless Steel Pipe

Welded steel pipe: A steel pipe produced by welding a steel plate or a strip of steel into a cylindrical shape. According to the welding method, it can be divided into arc welded pipe, high frequency or low frequency electric resistance welded pipe, gas welded pipe, furnace welded pipe, etc.; according to the weld form, it can be divided into straight welded pipe and spiral welded pipe.

Seamless steel pipe: Seamless steel pipe is a round, square and rectangular steel with a hollow section and no joints around it. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. The seamless steel pipe has a hollow section and is used as a pipe for conveying fluid. Compared with a solid steel such as round steel, the steel pipe has a lighter weight when it has the same bending and torsional strength, and is an economical section steel which is widely used for manufacturing structures. Parts and mechanical parts, such a

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Notice of oxyfuel and plasma cutting for making steel pipe

Oxyfuel and plasma cutting play an important role during the production process of making welded steel pipe like ERW steel pipe. And forgetting to grind the joint after oxyfuel or plasma cutting would be an common mistake for a new welder.


Today, we can make it alone to make an essay to tell all of us who need to choose steel pipes or producing tubes. Adding a layer of oxide to the cut edge during the oxyfuel and plasma cutting processes would be the necessary step for steel pipe. And here are the notices:

First of all, the oxide layer has to be removed prior to welding due to the higher melting point of oxide than base metal.

What’s more, the oxides can also remain in the weld and cause porosity, inclusions, lack of fusion and other defects.

In addition, welders have to keep in mind to grind the joint down to the parent material prior to welding, as well as grind the inside and outside diameters of the pipe to remove these oxides and other potential contaminants.

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Q345B Seamless Steel Pipe Mechanical Expansion Process

by permanent14 days ago

The tensile specimen type of seamless steel tube has a certain influence on the tensile test results. The yield strength of the round bar specimen is higher than that of the plate specimen, and the tensile strength is not much different. According to the analysis, it is recommended to use a round bar sample instead of a plate sample when the steel pipe size is allowed.

The new field construction non-welded reinforced concrete beam-seamless steel tube concrete column joints, through the experimental study of the tensile properties of different tensile specimens of Q345B seamless steel pipe - plate specimen and round bar specimen. The test shows that the tensile test results obtained by the plate sample and the round bar sample are different. The seismic performance test was carried out and the hysteretic behavior of the joint under the low-cycle reciprocating load at the top of the column was obtained.

The test results show that the new type of node has good ductility and energy consu

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Seamless Steel Tube Processing

by permanent22 days ago

Hot rolled seamless steel pipes are generally produced on automatic pipe rolling units. The solid tube blank is inspected and the surface defects are removed, cut into the required length, centered on the end face of the perforated end of the tube blank, then sent to a heating furnace for heating and perforated on the punching machine.

At the same time, the perforation is continuously rotated and advanced. Under the action of the roll and the head, a cavity is gradually formed inside the tube blank, which is called a capillary tube. It is sent to the automatic pipe mill for further rolling. Finally, the whole machine is uniform in wall thickness, and the sizing machine is sizing to meet the specification.

The production of hot-rolled seamless steel tubes by continuous rolling mills is a more advanced method. For smaller tubes of better size and better quality, cold rolling, cold drawing, or a combination of the two must be used. Cold rolling is usually carried out on a two-roll mill

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Seamless Steel Pipe And Pipe Fitting Installation Method

1. Cutting requirements for seamless steel pipe is different from lsaw steel pipe: After measuring the length, use the hacksaw, manual cutting saw, small circular saw blade and other cutting tools to cut the required pipe. After cutting, the vertical flatness of both ends must be kept, and then the burrs are removed. If the file is removed, it is necessary to carry out the corners, but it must be kept moderate and not too large.

2. Seamless steel pipe and pipe fitting method: pipe fittings before the test assembly, determine the location of the installation and mark, use sandpaper or abrasive cloth to lightly wipe the pipe, pipe fittings and then scrub with cotton yarn with acetone, After the acetone is volatilized, evenly apply a layer of adhesive to the pipe fittings and bond them with a brush. Be sure to apply evenly.

The flat is inserted and transferred to the desired combination angle for installation. It can be tapped with a mallet to insert the tube completely, and it will be

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Wide Application Of Seamless Pipes In Construction Engineering

by permanent27 days ago

With the development of social economy, the direct drinking water of the pipeline has developed rapidly in the application of urban life, and the medium-sized cities with developed economy are also actively planning to catch up. Seamless steel pipe is widely used in construction engineering.

1. Application in decoration engineering. In addition to walls, cylinders, automatic retractable doors, roller blind doors, ladder fence handrails, balcony handrails, rainwater downpipes, flagpoles, streetlight poles, arcade frames, kitchen bathroom countertops, sinks, brackets, etc. in residential buildings, The application is increasing, and the steel grade for decorative engineering applications is mostly 304, and 316 is also used.

2. The application of the roof. Early buildings using stainless steel roofing included the Savoy Grand Hotel in London, the Eurostar train station, the Chrysler Building in New York, and the Empire State Building.

3. Application in reinforced concrete. The use of s

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Reasons For The Defects Of Seamless Steel Pipe During Cold Drawing

by permanent28 days ago

1. The quality of the pipe and intermediate pipe of the seamless steel pipe is unqualified, and the geometrical dimensions are not satisfactory. The longitudinal and transverse wall thicknesses are severely uneven, the bending and ellipticity are too large, the chemical composition is incompatible, and the mechanical properties are not. with.

2. Failure to comply with the operating procedures for each preparatory process before drawing seamless steel tubes. The main ones are incorrect hammer process, improper chemical treatment and heat treatment, burrs at the pipe end, low quality of grinding, and defects during transportation.

3. Failure to follow the procedures for the extubation process. The performance is inconsistent in the center line of the seamless steel pipe, the installation of the extruding die is not correct, the opening speed is too fast, the tool is improperly matched, the diameter of the mandrel rod is too large or too small, the deformation is too large, and the mand

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How Are Thin-walled Spiral Tubes Classified?

The spiral tube is divided into two types: hot rolling and cold rolling (dial) spiral tubes. Hot-rolled spiral pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

Cold-rolled (dial) spiral pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, and also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, Rust thin-walled steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the diameter of cold-rolled spiral pipe can be 6mm, the wall thickness can be 0.25mm, the outer diameter of thin-walled pipe can be 5mm, the wall thickness is less than 0.25mm, col

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Seamless Steel Tube Flattening Test Method And Procedure

by permanent1 month ago

Seamless steel tubes are more cumbersome and more rigorous in the production process. After the seamless steel pipe is produced, it is necessary to carry out certain tests. Do you know the flat steel pipe flattening test method and steps?First, the flattened sample: 1. The sample is cut from any part of the seamless steel tube that has passed the visual inspection. The sample should be the full-loaded pipe section of the pipe product.

2. The length of the sample should be no less than 10mm, but not more than 100mm. The edges of the specimen are allowed to be rounded or chamfered by sputum or other means. Note: If the test results meet the test requirements, the edges of the specimen may not be rounded or chamfered. 3. If you want to carry out the tube end of a full length tubeDuring the test, the cut should be perpendicular to the longitudinal axis of the tube at the end of the tube from the end of the tube, and the cutting depth should be at least 80% of the outer diameter.

3. Test

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