ERW Steel Pipe

    Seamless elbow is manufactured by the seamless steel pipe, through hot push, press or extrusion processes, no seam on the elbow body.     Welded elbow is manufactured by welded steel pipe, same processes with seamless elbow.But there is a seam on the elbow body.     Prime steel pipe tells you the differences between seamless elbow and welded elbow on raw material, manufacturing processes, performances, appearances, sizes, applications, cost prices etc.     1. Appearance difference     The biggest difference between seamless elbows and welded elbows are whether there is a weld, but now many of the welded steel pipes will be polished off the welding seam before they leave the factory. The elbow that is made out of this steel pipe is invisible to the welding seam.There are a lot of exporter sell this kind of fake seamless elbow to customers. This kind of elbow is difficult to distinguish with the naked eye, and it needs to use ...

    Way to describe steel pipe dimensions and size correctly.     For example:     a. Expressed as “pipe outside diameter × wall thickness”, such as Φ 88.9mm x 5.49mm (3 1/2” x 0.216” ). 114.3mm x 6.02mm (4 1/2” x 0.237”), length 6m (20ft) or 12m (40ft), Single Random Length (SRL 18-25ft), or Double Random Length (DRL 38-40ft).     b. Expressed as “NPS x Schedule”, NPS 3 inch x Sch 40, NPS 4 inch x Sch 40. Same size as above specification.     c. Expressed as “NPS x WGT Class”, NPS 3 inch x SCH STD, NPS 4 inch x SCH STD. Same size above.     d. There is another way, in North America and South America, usually use “Pipe Outer Diameter x lb/ft” to describe pipe size. As OD 3 1/2”, 16.8 lb/ft. lb/ft is pound per feet.     http://www.xysteelpipe.com/info/How-to-Describe-Steel-Pipe-Dimensions-and-Size-Correctly-1028-1.htm

    Carbon steel is a metal alloy, with the carbon content of 0.05% to about 2.0%, and has trace amounts of other elements like manganese, silicon and copper in negligible quantity. With the industries adapting to perfectly balance metal combination to suit their needs, carbon steel finds prominence in many applications. In this post, we’ll discuss five things to ponder upon before choosing the right carbon steel grade.     Here are five factors to consider before choosing a carbon steel grade.     1. Welded Carbon Steel: Various types of carbon possess excellent welding ability. Certain carbon grades, like C1141 and C1144, cannot be welded, due to their additional sulfur content. The content causes weld solidification, which may result in cracking. Certain carbon grades, such as C1045 may require post weld heat treatment. Hence, before selecting a carbon steel grade it is important to look into the welding property of the carbon steel.     ...

    Classfication of seamless steel pipe by application     1. Line pipe.     Such as: water, gas pipes, steam pipes seamless pipe, oil pipeline, oil and gas line pipe. Agricultural irrigation faucet with pipes and sprinkler pipe.     2. Thermal equipment tube.     Such as general boiler boiling water pipe, superheated steam pipes, locomotive boiler superheater tubes, opium pipe, small pipe, brick arch pipe and high-temperature high-pressure boiler tubes.     3. Mechanical industrial pipe.     Such as aviation structural tube (tube, oval tube, flat oval tube), automobile axle tube, axle tubes, structural tubes automobile and tractor, tractor oil cooler tube, farm with a square tube and rectangular tube, transformer tube and bearing tubes.     4. Petroleum geological drilling pipe.     Such as: oil drilling pipe, drill pipe (Kelly and hexagonal drill), drill collar, oil tubing, casi...

    1. Shoddy thick-walled steel pipe prone to folding.     2. Bad thick-walled steel pipe surface prone to scarring.     3. Fake thick-walled steel pipe easy to scratch.     4. Pseudo-inferior material surface is easy to crack.     5. Shoddy thick-walled steel pipe without metallic luster, pale red or similar pig iron color.     6. Counterfeit thick-walled steel tube of fine and low cross-ribs, often appear dissatisfied with the phenomenon.     7. Fake thick-walled steel pipe cross-section was oval.     8. Fake thick-walled steel pipe material containing impurities, steel density is too small.     9. Forged thick-walled steel pipe diameter size fluctuations.     10. Quality control of the trademark and printing are more standardized.     11. Three large diameter pipe diameter 16 or more, the spacing between the two trademarks are above the IM.   ...

    Carbon seamless steel pipe connections are many ways, now commonly used in several ways:     Different connections, because of its production principle of the different areas in its application are also different, in general, there is a common point that is easy to install, solid and reliable. Here are some of the more common way to do a brief description of the connection:     1. Compression: the pipe inserted into the tube of the mouth, tightened by the nut, with a spiral force to the mouth of the casing through the sealing ring compression, the role of sealing, complete piping connections.     2. Welding: the end of the pipe processing groove, with manual or automatic welding of the pipe to do ring welding.     3 flange type: the flange and pipe for the ring welding, with fast clip or bolt fastening, so that the flange between the sealing gasket role in the completion of piping connections.     4. Clamping typ...

    According to different production methods, seamless steel pipe can be divided into hot rolling pipe, cold rolling pipe, drawing tube, extrusion tube.     1.Hot-rolled seamless pipe is generally in the automatic production of rolling mill unit. The solid tube blank is inspected and removed from the surface defects, cut into the required length, in the tube end of the perforation end of the centering, and then sent to the heating furnace heating, perforation in the punching machine. In the perforation at the same time continue to rotate and move, in the role of the roll and the head, the tube gradually formed within the cavity, called the capillary. And then sent to the automatic rolling machine to continue rolling. And finally by the whole machine are the whole wall thickness, by sizing machine diameter, to specifications. The use of continuous rolling mill production of hot-rolled seamless steel pipe is a more advanced method.     2.If you want to ...