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 ...

    Small caliber seamless steel tube is one of the important characteristics of seamless steel tube, with various technical advantages and various applications.Small seamless steel tubes with small outside diameter can be called small-diameter seamless steel tubes. Next, it mainly explains how the small-caliber seamless steel pipe is used for inspection and inspection.     Ultrasonic probes can realize the mutual conversion between electrical energy and sound energy and the physical characteristics of ultrasonic wave propagation in elastic media are the basis of ultrasonic flaw detection principle of steel pipe. The directional transmitted ultrasonic beam encounters defects when it propagates in the tube, causing both wave reflection and wave attenuation. After the signal processing of the flaw detector, such as using the reflection method to detect flaws, the flaw echo signal can be obtained. If the penetration flaw detection method is used, the defect signal ca...

    Boiler steel pipes includes medium pressure boiler pipe and high pressure boiler pipe, it is often manufactured in seamless procedures, welded steel pipe is not applicable. It has been widely used at heat exchanger pipe and tubing services, tube exchanger bundle, high pressure boiler, economizer, super heater, petrochemical industry pipes, etc.     Boiler pipe materials and standards     Standards and material for steel pipe is available at carbon, alloy, and stainless steel material.     Alloy steel: ASTM/ASME A/SA 213 T1, T2, T5, T9, T11, T12, T22, T91, T92; ASTM A335 P1, P2, P5, P9, P11, P12, P22, P91, P92     Carbon steel: ASTM/ASME A/SA 106, ASTM A179, ASTM A192, ASTM/ASME A/SA 210, ASTM A333 Gr 1, 6,7 to Gr 9,     Stainless Steel: ASTM A268, ASTM A213, TP304/L, TP316/L, 310S,309S,317,317L,321,321H, and duplex stainless steel material etc.     Common Sizes: OD from 6mm to 1240mm, thickness from 1m...

    Generally, the hardness of seamless steel pipes has three standards: Rockwell Hardness , Brinell Hardness and Vickers Hardness.     1.Rockwell Hardness     Rockwell Hardness is also use indentation to represent the hardness, but Rockwell measures its depth rather than diameter. Rockwell Hardness is widely applied in testing hardness of seamless steel pipes, the standard HRC is the most popular testing method next to Brinell Hardness (HB). Rockwell Hardness can be used to test both extremely soft and hard material which supplements shortcomings of Brinell Hardness. The number of hardness can be read directly from the dial. However, due to slighter indentation, Rockwell Hardness is less accurate than Brinell Hardness.     2. Brinell Hardness     Brinell Hardness is the most common standard for seamless steel pipes, generally use diameter of indentation to represent the hardness of material, which is intuitive and simple. Howev...

    The error side of high frequency straight seam welded pipe is the most common pre-welding problem, and the extreme difference will directly lead to the degradation of steel or scrap steel.Therefore, pre-welding requires strict control of the wrong side.In general, the whole or half of the steel tube billet is in error:     1, Open seam adjustment is not in place (seam side);     2, The joint pressure roller adjustment is not in place (pressure roller circumferential angle is not right, or to the tube centerline as the axis, the left and right pressure roller asymmetry, or the relative pressure roller radial extension is inconsistent), no pressure round;     3, The pre-bend is not pre-bending in place, there is a straight edge edge of the phenomenon.     When the head or tail of the tube is wrong, it is generally due to:     1, The import and export roller position is not right;     2, Ring frame cente...

    As the long-distance natural gas pipeline through the long distance, complex geographical environment, therefore, a variety of factors affect the normal pipeline services, but the most important factor can be divided into the external environment and the quality of the pipeline itself. Steel pipe, quality is the most important factor affecting the quality of the tube and the main aspects of the quality of the steel pipe include the use of steel and steel pipe quality steel pipe manufacturing process.     The incomplete fusion of the filled metal base or the filling metal is not filled with metal between the fusions. The main reason for the absence of fusion is when the tank is not clean, the drawing speed is too fast, the welding current is too small, the improper electrode angle, and so on. Slag: refers to the residual residue in the weld metal or non-metallic inclusions. The main reason for the slag is the welding current is too small, the welding speed is to...

    Seamless steel pipes are mainly used in oil pipeline and gas pipeline, but seldom used in oil pipelines with long-distance. Most long distance pipeline applied ERW pipes, SSAW pipes and LSAW pipes. Here are comparisons of technological features and performance of these pipes.     1. Spiral Submerged-Arc Welding Pipes     Spiral submerged arc welded (SSAW) pipes has spiral welding joints and the pipes are welded and formed at the same time. The strip steel with the same specification can produce SSAW pipes with various diameters. The welding joints can avoid major stress and have better force resistance. Disadvantages are poor geometrical diameters; longer welding joints and joints are easily to have cracks, porosity and other welding defects. According to the design specification of oil and gas pipeline, SSAW pipes only can be used in the third and fourth class areas. Developed countries have improved the technology, apart forming and welding, and h...

    Tips for choosing good quality seamless steel pipes.     1. As for good quality seamless steel pipes, its cross section should be smooth and even. If you see there is burr or uneven cross section, do not pick up these defective seamless steel pipes.     2. You need to know the percent of impurities. Weight the pipes and measure its density. If it is low density, light seamless steel pipes will be poor quality.     3. Check the shape of seamless steel pipes. As for poor quality pipes, you will find oval shape on the side of it.     4. Check trademark. There will be standard trademark and words on seamless steel pipe from good quality seamless steel pipes manufacturers.     5. Check the surface of seamless steel pipes. Bad rolling technology produce rough surface seamless steel pipes. Do not choose poor surface seamless steel pipes.     http://www.xysteelpipe.com/info/Tips-to-Choose-Good-Quality-Seamless...

    A. Precision of seamless steel pipe outer diameter: it depends on the order (reduction) diameter method, the working condition of the equipment, technological system, etc.     Permissible deviation of outside diameter: δ=(D-Di)/Di ×100% D: maximum or minimum mm     Di: nominal outer diameter mm     B. The wall thickness precision of steel tube: it is related with pipe billet heating quality, process design and adjusting parameters of each deformation process and tool quality and the quality of lubrication and so on.     Allowable deviation of wall thickness: ρ=(S-Si)/Si×100% S: maximum or minimum wall thickness on the cross section     Si: nominal wall thickness mm     C. Ovality of steel pipe: it means the degree of out of round steel tube.     D. Length of steel tube: normal length, fixed (multiple) length, length of allowable deviation     E. Bending of steel tube: it indicat...