ERW Steel Pipe

　　Generally, in terms of the surface treatment for stainless steel pipes , manufacturers have three methods, blenching treatment, polishing treatment and coloring treatment. However, it’s unavoidable to have some problems during the surface treatment, mainly are the following problems. 　　1. Defects of welding crevice. When the defects are serious, usually can apply the mechanical polishing process to deal it, however, this method may cause grinding marks and result in the uneven surface and influence the appearance of pipes. 　　2. Uneven surface. If only give pickling passivation to welding crevice, it will also cause the uneven surface and affect the appearance of pipes. 　　3. Uneven polishing. For the lager object, carrying pickling passivation after manual polishing is also difficult to reach the even surface and the processing is time and cost consuming. 　　4. Limited capacity of acid washing. The pickling passivation is not a panacea for all kind of surface treatment. It’s al...

　　Mechanical properties of seamless steel should be taken into consideration when testing its hardness which related to the quality and performance after deformation, stamping, cutting and other processing. Thus, all seamless steel pipes need mechanical property test, the test has two types: tensile test and hardness test. 　　Tensile test is use a seamless steel pipe sample, and then pull the sample on the machine till it’s broken, therefore can test its tensile strength, yield strength, and elongation. The tensile test is the most common method to test the mechanical property of metal material. As long as the mechanical property is required, all metal material need to have tensile test. Particularly for those metal materials have complicated shapes that are not easy to be tested, the tensile test is the only way to test its mechanical property. 　　Hardness test is use a indenter and pressed it into the surface of sample pipes slowly, then measure the depth or dimension of the inden...

　　The bearing capacity of spiral welded steel pipe is related to two points. One point is the mechanical properties of steel, which is related to the commonly stated yield point, tensile strength, elongation and impact toughness. The other point is related to the geometrical characteristics of its section. Generally, a circular spiral welded steel pipe has the strongest resistance to local buckling, and thus it is the best member to withstand radial internal pressure and radial external pressure. 　　Under the same steel number, equal area and the same supporting conditions, the rectangular slanted steel pipe has strong eccentric compression bearing capacity, and the circular and square steel tubes have the strongest compressive bearing capacity, but the square and rectangular straight seam steel pipes are subject to the ability of the nip to resist local buckling is not as good as that of a circular steel tube. Compared with spiral welded steel pipe, the seamless steel pipe has compli...

　　 Seamless steel pipes are widely used in various fields, but how to distinguish their quality? Here we will introduce you some way to distinguish. 　　1. Fake seamless steel pipes are easily to have puckers. Puckers referring to all folding lines on the surface of pipes, and the defects are usually longitudinally throughout the entire product. The primary reason for puckers is that manufactures are blindly pursued for high efficiency via wrong technique that cause ear and produce folds in next procedure. The folded pipes are easily to crack and the strength is also greatly decreased. 　　2.The fake pipes generally have pitting surface. Grooves with serious abrasion were the major reason for irregular and uneven defects on pipes' surface. Some manufactures just focusing on profits and often make excessive the groove rolling. 　　3. The surface of fake pipes is easily tended to produce scars. There are two reasons for scars. Firstly, the fake pipes were made of uneven material wit...

　　1. Due to the arc deviation, local distortion of longitudinal seam welding, The radian and ovality deviation of steel pipe will be difficult to ensure the deviation, and it take the following measures to guarantee. 　　(1) To design and produce longitudinal seam local arc calibration machine, after welding longitudinal seam, to use machine calibration to ensure its partial arc deviation. 　　(2) Set up the reasonable steel pipe support to ensure deformation value and ovality of steel pipe. 　　2. In order to ensure the straightness of the deviation when steel pipe assembling, following measures can be taken. 　　(1) Improving groove design, adopting asymmetric X groove, leaving no space, cleaning with carbon arc air gouging after the inseam welding, making inside and outside of the weld actual area is almost close to equal, these measures are helpful to reduce the deformation and the residual stress. 　　(2) Improving welding technology taking small-area welding, especially the first...

　　Hot-rolled is based on the slab (mainly billet) as raw material, heated by a roughing mill and finishing mill group made of steel. From finishing the last one out of the hot strip mill by laminar cooling to the set temperature, the coiling machine rolled steel strip coils, steel roll cooled through different finishing line processing and become steel, flat volume and slitting steel products. Cold drawing means at room temperature, after cold-drawing, bending, drawing and other cold plate or strip into the processing of various types of steel. 　　Hot-rolled and cold-rolled difference: 　　1, Hot rolling and cold drawn steel or steel plate forming process is the same, they have a great impact on the microstructure and mechanical properties of steel, rolled steel, hot-rolled mainly based, cold-rolled steel used only for the production of small and sheet. 　　2, Cold- formed steel cross-section appears to allow local buckling, which can make full use of the rod bearing capacity after bu...

　　Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process in the transport and use of chemical or electrochemical corrosion reaction of steel pipe . 　　Anti-corrosion steel pipe in the country is mainly used for petroleum, chemical, gas, heat, sewage treatment, water, bridges, steel pipes and other engineering fields. Anti-corrosion steel pipe is divided into the following categories: IPN8710 corrosion, FBE epoxy powder corrosion, 2PE/3PE corrosion, Coal tar epoxy anticorrosive, High-density polyethylene jacket corrosion 　　 The processing standard: 　　1.The petroleum natural gas uses three polyethylene (3PE) Steel pipe anticorrosion 　　Standard: SY/T0413-2002\DIN30670-1999 　　2. fluming water, oil, gas Medium and so on use two, three polypropylene (PP) anticorrosion 　　Standard: DEP 31.40.30.31 　　3. The petroleum natural gas uses FBE(Single-layer nodulizing epoxy powder anticorrosion) 2FBE(Double-decked no...

　　 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. 　　Here are five factors to consider before choosing a carbon steel grade. 　　1. Machined Carbon Steel: Certain grades of lower carbon steel like C1010 and C1018 possess good machining ability. Carbon steel like C1141 and C1144 have a higher amount of carbon due to their additional sulfur content which can be machined very easily. Thus, it is very important to look into the carbon steel grade which is machined. 　　2. 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. ...

　　Generally speaking, we would like to say that seamless steel pipe can be applied among oil, gas transmit. This means that different medium transport with each kind of different seamless steel pipe. 　　We can divide seamless steel pipe into hot-rolled and cold-rolled steel pipe according to production process. With different purposes, we would make a list for different categories of seamless steel pipe: 　　Fluid transmission would adopt the seamless steel pipe mainly used for this medium. 　　Low and medium pressure boiler seamless steel pipe, used for structures, are mainly boiling water steel pipe, locomotive boilers, superheated steam pipe and so on. 　　High pressure steel pipe would be categorized as the high quality carbon steel, alloy steel and heat-resistant stainless steel seamless steel pipe. 　　Petroleum cracking seamless steel pipe is for oil smelter boilers, heat ex-changers and their transmission fluid pipe. 　　 http://www.xysteelpipe.com/info/Different-medium-transp...

　　Socket Weld (SW) fittings are defined in the ASME B16.11. As with socket weld, a pipe is inserted into a recessed area of the fitting. Both the pipe and the fitting are square cut, with no need for beveled end or preparation other than cleaning the outside, which allows easy welding and installation. Butt weld (BW) fittings are defined in the ASME B16.9. They are welded at their ends to pipe end, with the same thickness as pipes. The end of butt weld fittings shall be beveled. 　 　Application 　　Socket weld (the fillet weld) resists around 1/2 the strength of butt welding. So it is mainly used for small pipeline (Small Bore Piping) with diameters NPS 2 or smaller. 　　Butt weld keeps better strength, good for high pressure or high temperature pipelines. So it is used when a welded joint with strength not lower than that of the base metal itself is needed. 　 　Feature 　　Socket weld is easy to install. But it requires approx. 1/16″ of gap at the bottom of the pipe to socket into, ...

　　ASTM A179 cold drawn seamless steel pipe is mainly used in the metal structure equipment of various industries. It is mainly to soak the rust of steel parts into the molten zinc solution of 440 to 460 degrees C, so that the zinc coating on the surface of the steel plate is attached to the surface of the steel, thus the purpose of anticorrosion is to be played. This is an effective way of metal corrosion. The main features are as follows: 　　(1) the ASTM A179 cold drawn seamless steel pipe manufacturer covers the compact and compact zinc layer on the surface of the cold drawn seamless steel tube. It can avoid the cold drawn seamless steel tube matrix and any contact with the corrosion solution to protect the steel matrix from corrosion. In the general atmosphere, the surface of the zinc layer forms a thin and dense Zinc Oxide surface, which is hard to dissolve in water, so the steel matrix plays a protective role. If Zinc Oxide and other components in the atmosphere produce insolubl...

　　Nowadays, there are many options for steel pipes, such as galvanized pipe, ERW Steel pipes , DOM tubing, and much more. What makes each one unique or stand out from the crowd? The galvanized pipe has many features that make it appealing to many industries. 　　The process of galvanizing is the submersion of a steel or iron pipe in a molten zinc bath. Before it is dipped in zinc, the steel tube needs to be properly cleaned. The thickness of the coat can be adjusted as needed. 　 　Galvanized Pipe Benefit – Cost 　　It is hard to find a good product with a low cost. That is why galvanized tubes are high on everyone’s list. Galvanizing a pipe usually cost much less than other protective methods. In addition, galvanizing is much less labor intensive, which in turn, makes the cost lower. Along with the cost, longevity is another added bonus of galvanizing. A properly galvanized tube can last decades. 　　Low Maintenance and Toughness 　　The coating of the pipes makes it much more tough a...

　　Cold rolled seamless pipes(GB3639-2000)are cold drawn or cold rolled precision seamless steel pipes with high accuracy of the dimension and good finish of the surface used for the machinery and hydraulic equipment. The cold rolled process refers to the method adopted to process the steel plates or strips into various types of steel products by cold working processes such as the cold bend and cold drawn processes. Cold rolled seamless pipes not only include general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking steel pipes, but also include carbon steel pipes with thin walls, alloy steel pipes with thin walls, stainless steel pipes with thin walls and special-shaped steel pipes. The hot rolled seamless pipes usually have outer diameter larger than 32mm and wall thickness between 2.5mm to 75mm; the cold rolled seamless pipes usually have the outer diameter less than 6mm and wall th...

　　 Coated pipes offer high resistance to corrosion on pipes and provide many benefits such as: 　　1. Increased Flow Capacity – A coating on pipes helps provide a smoother surface thus improving gas and liquid flow within pipes. 　　2. Reduced Cost – The pipeline coating increases the pipes durability so they can be deployed with minimum maintenance cost even in the harshest environments. 　　3. Lower energy usage – Various studies have shown that pipelines that are internally coated use less energy for pumping and compression of products through pipes. This helps in increased saving over time. 　　4. Clean delivery of products – The inhibitors used for the protection products can also be minimised by the use of coated pipes for delivery of products. 　　Thus, coating of pipelines can help you in reducing your maintenance cost and at the same time providing a corrosion free reliable protection.

　　3LPE/3 LPP coating is anti-corrosive coating of 3 layers of epoxy, adhesive and PE/PP respectively on pipes, as per following details 　　1st layer is of epoxy coating which acts as anti-corrosive layer. 　　2nd layer is of adhesive coating which acts as Tie layer between epoxy and PE/PP. 　　3rd layer is of polyethylene/polyethylene coating which provides mechanical strength to the coating. 　　Application & Specification: 　　3LPE Coating(DIN 30670)for service temperature upto +800 C 　　3LPP Coating (DIN 30678)for service temperature upto +1100 C 　　Single Layer FBE Coating (Canadian CAN/CSA Z245-06/NACE RP 0394)for service temperature upto 800 C 　　Dual Layer FBE Coating (Canadian CAN/CSA Z245-06/NACE RP 0394) for service temperature upto +800 C 　　Internal Flow Coating (API RP 5L/ISO 15741) for service temperature upto +800 C 　　Internal slovent free epoxy(AWWA C 210/NF-French Specification & BS British Speciation) for service temperature upto +800 C 　　 Check www.t...