Seamless Steel Pipe

　　A pipe end is the description of how the section of pipe ends. Understanding the end of pipe is important when designing a piping system since it would be inappropriate for the designer to specify a threaded connection for a large diameter pipe or to specify a welded end when connecting to a threaded component. 　　Typically used on pipe 3" and smaller, threaded connections are referred to as screwed pipe. With tapered grooves cut into the ends of a run of pipe, screwed pipe and screwed fittings can easily be assembled without welding or other permanent means of attachment. In the United States, the standard pipe thread is National Pipe Thread (NPT). The reason for this is that as NPT connections are assembled, they become increasingly more difficult for the process to leak. The standard taper for NPT pipe is 3/4" for every foot. 　　Threaded fittings have threads that are either male or female. Male threads are cut into the outside of a pipe or fitting, while female threa...

　　In long distance conveyance of crude oil, natural gas or refined oil, the pipeline usually need to be buried underground. When steel pipes or pipe fittings are in contact with soil and waters, we must consider its external anti-corrosion performance to ensure a durable lifespan of the pipeline. 　　The three layers Polyethylene(3PE/3LPE) external coating perfectly solves this problem. It consists of a high performance fusion bonded epoxy(FBE) layer, an adhesive layer and an outer layer of high density polyethylene. The three layers external coating has excellent resistance to abrasion, wear, acid, alkali and cathodic disbonding, etc. 　　3LPE coated pipes consist of 3layers for pipeline coating. 　　Layer 1(FBE>100um consists of fusion bonded epoxy. This layer protection against corrosion and is fusion with the blasted steel surface. 　　Layer 2 (170～250um) is copolymer adhesive which has excellent chemical bonding to the inner layer and the top layer of polythylene 　　Layer 3 (...

　　Comparing to other steel grades, casing pipes of grades J55, K55 are a popular choice for wells without stringent anti-corrosion or strength requirements. Here, we will introduce you the difference between K55 and J55. 　　Chemical composition and physical properties 　　API grade K55 has the same Chemical composition as grade J55, both of them has the same yield, but its minimum tensile strength is about 26% higher compared to J55. 　　 J55 　　Yield strength: 379-552 MPa (55-80 ksi), 　　Minimum tensile strength: 517 MPa (75 ksi) 　 　K55 　　Yield strength: 379-552 MPa (55-80 ksi), 　　Minimum tensile strength: 665 MPa (95 ksi) 　　Heat treatment (PSL2 and PSL1 are different) 　　API 5CT J55 PSL1 and API 5CT K55 PSL2 is the same (Rolling delivery); 　　PSL2 :J55 and K55 should be normalized or normalized and tempered. If thickened, normalizing or normalizing and tempering should be added after thickening. 　　 Impact test (PSL2 and PSL1 are different) 　　Tubing: PSL1, J55 and K5...

　　Seamless steel pipes are more expensive than ERW steel pipes with the same performance. Why? Due to the special craftsmanship, it gives special benefits for it too. Today, we can can the advantages first. 　　Increased pressure ratings: Because of no damage for the whole steel billet like the welded seam on welded steel pipe, this would increase seamless steel pipe’s ability to hold on the high pressure. 　　Uniformity of shape: Seamless steel pipe would be round for each kind of engineering project as it is never treated as welded steel pipe. Through heat, stress, and other extraneous variables to the forming process, welded steel pipe would have effect on round aspect. While, there is no trouble for seamless steel pipe. 　　Strength under loads: Due to the first two advantages for seamless steel pipe. There is no doubt that they would have powerful strength under load when they work for us. Empty pipe must always support its own weight, but when a pipe is filled with material–or un...

　　Most people think that any natural gas pipe can be used for gas. This certainly isn’t the case. The size of the pipe dictates the amount of gas that can pass along the pipe. It’s also worth noting that the longer the pipe, the lower the flow (be aware that the flow of gas is measured in BTUs (British Thermal Units) per hour. If you’re going to be working with natural gas it’s important to be familiar with the sizes of natural gas pipes and the amount of gas that can pass along them for different lengths. 　 　Nominal Size 　　The nominal size of the natural gas pipe is actually the exterior size. This is generally used as a reference for the pipe, although the interior size of the pipe is less. For instance, pipe with a nominal size of one inch will have an interior size of just under ? inch (actually .49 inches). 　　 Pipe Length 　　The length of the pipe will have a deep influence on the amount of gas that can flow through it. Where a pipe has a nominal size of one inch, the flow ...

　　Steel is created when carbon is added to iron, which is relatively weak on its own. In modern industry, carbon is the most prominent additive to a ferrous material, but alloying elements of all sorts are common. 　　In fact, alloying elements are common even in piping products still considered to be carbon steel. 　　According to the American Iron and Steel Institute (AISI), ferrous material is designated as carbon steel when its core makeup is specified to include no more than 1.65 percent manganese, 0.60 percent silicon and 0.60 percent copper and when no minimum content is specified for other alloying elements. 　　 Carbon steel pipe enjoys wide use across many industries due to its strength and ease of workability. Because it contains relatively few alloying elements and in low concentrations, carbon steel pipe is relatively inexpensive. 　　However, it isn’t suited for extreme temperature or high-pressure service because the lack of alloying elements makes it less resistant to ...

　　From manufacturing processes we can know that SAW (LSAW, SSAW) and ERW pipes are entirely different right from formation, welding etc. and hence, the performance of both the pipes differ in the following aspects: 　　1. The surface quality of ERW pipes are better when compared to SAW (LSAW, SSAW) pipes, as they are smooth and have a better finish. In most of the SAW pipes, it is mainly about the weld reinforcement internally and externally. 　　2. The defects found in ERW pipes are lesser than SAW pipes. As there is a solvent deposit in SAW pipes, it results in more defects apart from the defects in the volume. The defects found in ERW pipes are only confined to wire-line and straight welds and it can be inspected easily. The defects can be noticed easily and the ultrasonic reflection on the surface makes it easier to detect. 　　3. The residual stress ratio in ERW is lower than SAW pipes. As ERW pipe deformation happens more in ERW followed by a sizing of flat oval, it results in e...

　　 Welded steel pipe , also known as welded pipe, it is made of steel sheet or strip that experience crimp forming welding. The production technology of welded steel pipe is simple, with high production efficiency, various specifications, less equipment investment, but the general strength is lower than the seamless steel pipe. Since the 1930s, with the rapid development of high quality strip steel rolling production and the progress of welding and inspection technology, the weld quality constantly improves. Welded steel pipe specifications increase day by day, and replace seamless steel pipe in more and more field. In terms of the form of welded steel pipe, it can be divided into the weld seam welded pipe and spiral welded pipe. 　　The billet that welded steel pipe adopted is steel plate or strip steel. Because of the different welding process, welded steel pipe is divided into furnace welded pipe, welded (erw) pipe and automatic arc welding pipe. Due to its different welding form, i...

　　Manufacturing types and processes of stainless steel pipe 　 　1. Seamless Hot Rolling Processes 　　Round Pipe Billet → Heating → Perforation → Three Roll Skew Rolling, Continuous Rolling or Extrusion → Off Pipe → Sizing (Or Reducing Diameter)→ Cooling → Billet → Straightening → Water Pressure Test ( Or Flaw Detection) → Marking → Storage 　 　2. Seamless Cold Rolling (Cold drawn) Processes 　　Round Pipe Billet → Heating → Perforation → Head → Annealing → Pickling → Oil (Copper) → Multi Pass Drawing (Cold Rolling) → Billet → Heat Treatment → Straightening → Water Pressure Test → Marking → Storage 　　 3. Longitudinal welding (Straight seam welding) processes 　　Including ERW, EFW.

　　Production characteristics of high pressure boiler tube： 　　1. Tube. High surface quality requirements, the need for stripping, an amount of 5 mm strips, some plants take black grinding. 　　2. Tube cutting. Hard steel, the use of flame cutting or sawing. 　　3. Heating. Poor thermal conductivity, and therefore to control the furnace end temperature. The heating temperature is generally 1120 ~ 1180 ℃. 　　4. Rolling. Such steel is generally better performance perforation, deformation parameters can be selected carbon steel. 　　5. Rolling after heat treatment. Such pipe after rolling to normalizing and tempering. Air cooling after hot rolling and then take some factories in 730 ~ 740 ℃ tempering. 　　Higher steel tube geometry requirements in order to ensure a good counterpart welding, pipe length should be as long as possible, helps to reduce the number of welds. 　　 http://www.xysteelpipe.com/info/Production-characteristics-of-high-pressure-boiler-tube-1251-1.htm