Seamless Steel Pipe

　　The solution temperature is mainly determined by chemical composition. In general, the solution temperature should increase for those containing many kinds of alloy elements or with high alloy. Especially for those that contains high steel, like manganese, molybdenum, nickel, silicon. Only by increasing the solution temperature can we dissolve and soften them. 　　But for stabilized steels such as 321 stainless steel pipe, when the solution temperature is high, the carbide of the stabilizing elements are fully dissolved in the austenite and precipitate in the grain boundary with the form of Cr23C6 after cooling. That can cause intergranular corrosion. We often adopt the lowest solution temperature for carbide(Tic and NbC) of the stabilizing elements which can't be dissolved or treated by solid solution. 　　For seamless stainless steel pipe, the three elements of the solution treatment are temperature, holding time and cooling rate. What is the role of solution treatment of seaml...

　　 Seamless steel pipe is rolled metal blank, seamless steel pipe through the die drawing into section reduced length increased processing method, are mostly used for cold working, and the metal is put in the sealed container, pressure is applied to one end, whereby the metal extruder with a same shape and size of the finished die hole in a predetermined processing method, which is extruded. In this way, when the production of non-ferrous steel sheet multi. 　　In the case of smelting strict control, there may be delamination defects in seamless steel pipe, which controls the pipe to improve the plasticity and toughness, and improve the cleanliness of the steel, while reducing the harmful impurities. To reduce osteoporosis center segregation and center on the need to increase the proportion of equiaxed slab, only to take reasonable cooling system to be able to avoid cracks inside the slab, billet or rolling off the assembly line for coarse blanks to take the slow cooling process, redu...

　　It is important to know the quality of thing that you are going to purchase, here we are going to introduce some simple quality identification methods of SA 213 boiler tube. 　　First, low quality SA 213 boiler tube prone to fold. Folding is a variety of polylines formed by the surface of the SA 213 boiler tube, which often runs through the longitudinal direction of the entire product. The reason for the folding is due to the high efficiency of the poor manufacturers, the amount of pressure is too large, resulting in the ear, the next rolling to produce folding, folding products will crack after bending, SA 213 boiler tube strength decreased. 　　Second, poor quality SA 213 boiler tube surface prone to scarring. There are two reasons: 　　1. Poor SA 213 boiler tube material is not uniform, more impurities. 　　2. Poor quality manufacturers guide guide equipment simple, easy to sticky steel, these impurities are easy to produce scar after the bite roll. 　　Third, poor quality SA 213 ...

　　Production of cold drawn seamless tubes needs attention to control: 　 　1, Capillary tube 　　The wall thickness of the capillary tube should be uniform, and the surface defects on the inner and outer surfaces should be small; the outer surface polishing and inner hole defect cleaning equipment should be arranged. 　 　2, Reexamination 　　Compared with ordinary cold drawn steel pipe, cold drawn seamless tubes production increases the hot-rolled capillary pickling re-examination process, mainly to ensure that there are no defects such as folding and crack on the outer surface of the capillary tube, and the inner surface is excluded from folding and severely scribed. Tubes with defects such as pockmarks. 　 　3, Tools 　　Generally, the surface roughness of tools used in the production of cold drawn seamless tubes is above Ra0.4, the dimensional accuracy is above H3, and the hardness is required to be above HRC70. At the same time, it is required that the tip or mold sticking phenome...

　　High-frequency welding machine welding uses the unique skin effect and proximity effect of high-frequency current, so that the welding current is concentrated on the surface of the contact, the temperature of the surface joint surface rises rapidly, and the surface to be welded is heated to a plastic state of melting or near melting. A pressure welding method that is then quickly extruded into a joint. This welding method has a series of advantages: the weld heat affected zone is small, the heating speed is fast, so the welding speed and weld quality of the frequency welder can be greatly improved, and the strip steel which is not pickled, shot blasted and trimmed can be used as the blank. At the same time, it can weld alloy steel, high alloy steel and non-ferrous metal pipe, which greatly reduces the unit power consumption. A variety of metal welded pipes can be produced with a single welding equipment. For different metals, only the welding power and welding speed have to be change...

　　The influence of raw materials on the welding quality in the production process of erw steel pipe mainly includes three aspects: unstable mechanical properties of steel strip, surface defects of steel strip and large deviation of geometrical dimensions. Therefore, it is necessary to carry out key control from these three aspects. 　　1) Influence of mechanical properties of steel strip on the quality of steel pipe The steel grade commonly used for welded steel pipe is carbon structural steel. The main grades are Q195, Q215, Q235 SPCC SS400 SPHC and so on. The yield point and tensile strength of the steel strip are too high, which will cause the forming of the steel strip to be difficult. Especially when the wall of the tube is thick, the resilience of the material is large, and the steel tube has a large deformation stress during welding, and the weld seam is prone to cracks. When the tensile strength of the steel strip exceeds 635 MPa and the elongation is less than 10%, the weld is...

　　Even for ASTM steel pipe, it is only one main category. However, we can divided seamless steel pipe or other pipes into lots of detailed categories according to the different material’s component. Here is our explanation for it. 　　Alloy ASTM steel pipe: 　　ASTM A333 alloy steel seamless pipe: ASTM A333 Gr.1 Gr.3 Gr.6 alloy steel pipe is for low temperature services. 　　ASTM A335 alloy steel seamless pipe: ASTM A335 alloy steel seamless pipe for high-temperature services. 　　ASTM A209 alloy steel seamless pipe: ASTM A209 Seamless Carbon-Molybdenum Alloy Steel Boiler and Superheater Pipe. 　　ASTM A213 alloy steel seamless pipe: ASTM A213 Alloy Steel Boiler, Superheater, and Heat-Exchanger Pipe. 　　ASTM A199 alloy steel seamless pipe: ASTM A199 seamless cold-drawn intermediate alloy-steel heat-exchanger and condenser tube. 　　 Carbon ASTM steel pipe: 　　ASTM A178 ERW tube: ASTM A178 electric-resistance-welded carbon steel and carbon-manganese steel boiler and superheater tube. ...

　　JCOE lsaw steel pipe manufacturing process is a new type of welded steel pipe forming technology that was developed in the 1990s. The main forming process of this technology is to mill the edge (or planing edge) of the steel plate before the steel plate width direction. Pre-bending, and then step-by-step molding in the order of J letter type → C letter type → O letter type, and multiple times of pressure stamping in the forming process, the three-point bending mold is used as the basic principle. 　　Since the raw material steel plate of lsaw steel pipe is formed by multiple progressive die pressing, it is necessary to solve the following basic problems: 　　1. How to determine the shape of the die, the stroke of the upper die and the spacing of the lower die 　　2. How many punches are required to ensure the most suitable punching Bending radii and optimal open O-tube. These problems are different from the steel plate material, the specific mechanical properties of the steel plate p...

　　It may be similar when we discussed that we need to buy steel pipe. However, there would be difference for seamless or ERW steel pipe. Of course, there are still difference even for seamless steel pipe. Today, our main topic would be the attention notes for SMLS steel pipe. 　　First of all, materials’ trouble before purchasing. 　　No doubt that different components of material would lead to various steel pipe’s quality. Although it can be used to distinguish, it is clear that this is a misunderstanding. For example, different carbon in steel pipe would make low, medium and high or super high carbon steel pipe. So does for SMLS steel pipe. 　　Secondly, size question for SMLS steel pipe. 　　Different size would determine the usage of various steel pipe. Many customers are basically no technical support for testing. Under this situation, we should figure out the basic math for calculation of the size for steel pipe. Asking us if you don’t know how to deal with this trouble. 　　 htt...

　　ASTM A335 P11 is part of ASTM A335, and the pipe should be suitable for bending, flanging and similar forming operations, and suitable for welding. 　　The steel should meet the requirements of chemical composition, tensile properties and hardness. Water pressure test should be carried out in every pipe. In addition, each pipe should be inspected according to the required practice by NDT. 　　Mechanical test requirements for different pipelines, such as lateral or longitudinal tensile tests, flattening tests and hardness or bending tests, are presented. 　　The ends of each box will indicate order number, heat number, size, weight and binding or as required. 　　Outer Dimensions: 19.05mm – 114.3mm 　　Wall Thickness: 2.0mm – 14 mm 　　Length: max 16000mm 　　Steel grade: ASTM A335 P11 　 　Packing: 　　Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested. 　　 Inspection and Test: 　　Ch...

　　After the double-sided submerged arc welded pipe(dsaw pipe) is rusted, the surface of the steel is mainly polished by using a wire brush or the like, and the cleaning and preheating of the spiral pipe can remove the loose or raised scale, rust, welding slag and the like. The descaling of manual tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the surface of the lsaw steel pipe is attached with strong iron oxide scale, the rust removal effect of the tool is not ideal, and the anchor depth required for anti-corrosion construction cannot be achieved. 　　On the basis of the traditional application, a new application has been added, which makes the use of the lsaw steel pipe more abundant, and at the same time reduces the use cost of the lsaw steel pipe. The radio frequency sensor provides 200 volts, 50 amps of smooth flow through the lsaw steel tube, and the experimental sample is heated by induction. The lsaw tube itself does not get hot, but the e...

　　Each kind of steel pipe has its special character for various engineering projects. And for seamless steel pipe, no seam maybe one of the benefits for seamless steel pipe once customers would like to choose them for project. 　　Here is the picture about the seamless steel pipe’s production process. From the entire procure, we can tell that there is no seam during the production. Under this situation, it would provide no weakest point for the pipe. So the tensile strength is uniform around the entire circumference of the steel pipe. What's more, this would lead to the nominal pressure ratings that are based on the tensile strength of the seamless steel pipe. You’d better think twice before wholesale if you have high demand for the tensile strength and balanced pressure taking for the steel pipe. 　　 http://www.xysteelpipe.com/info/No-seams-may-be-one-of-the-advantages-of-seamless-steel-tubes-1189-1.htm

　　The characteristics of thick walled seamless steel pipe production line is the production line length, transmission equipment, tension control strict requirements, strip steel is easy to deviation, required continuous production. Thick wall seamless steel tube rolling process, local advance into the austenitic seamless steel tube manufacturer non recrystallization region and two-phase zone limit. Non recrystallization zone rolling to get ferrite austenite grain size and uniform and rolling the total deformation volume and pressure rate, when the total amount of deformation and pressure ratio is greater, ferrite grain finer and more uniform. Local area is also known as the crack opening and the central, due to excessive cold, compared with the substrate side to advance into, therefore opening cracks of the ferrite grain size is smaller, base material grain changes little, two differences lead to rolling crack. 　　Thick wall seamless steel pipe continuous hot dip galvanizing producti...

　　ASTM A556 Standard Specification is for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes. 　　ASTM A556 is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. 　　Scope: 　　1. This specification 2 covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes including bending into the form of U-tubes, if specified, for use in tubular feedwater heaters. 　　2. The tubing sizes covered shall be 5/8-11/4 inch (15.9-31.8mm) outside diameter, inclusive, with minimum wall thicknesses equal to or greater than 0.045 inches. 　　 Chemistry Composition Grade C % Si % Mn % P % S % B2 0.27 max 0.10 min 0.29-0.93 0....

　　 Spiral Pipe is a strip coil as raw material, often warm extrusion molding, automatic double wire-sided submerged arc welding process welded spiral seam steel pipe. 　　(1) raw materials that strip, wire, flux. We must go through rigorous physical and chemical testing before it is put. 　　(2) strip head and tail docking, single or double wire submerged arc welding, in rolled steel by automatic submerged arc welding. 　　(3) before forming the strip after flattening, cutting, trimming, planing, surface cleaning conveyor and I crimping process. 　　(4) the use of electric contact pressure gauge to control both sides of the conveyor pressure cylinder pressure to ensure the smooth delivery of the strip. 　　(5) the use of internal or external control roll forming. 　　(6) adopted the weld gap control device to ensure the weld gap to meet the welding requirements, diameter, the wrong side and the weld gap have been strictly controlled. 　　(7) within the welding and soldering are used o...