Seamless Steel Pipe

    The main factors affect the quality of seamless steel pipe machining are machine tools, knives, fixtures, workpiece blanks, process methods and processing environment. To improve the quality of seamless steel pipe cutting, we must take appropriate measures in these areas, such as reducing machine work error, the correct selection of cutting tools to improve the quality of blanks, reasonable arrangements for the process to improve environmental conditions.     Reduce the seamless machine tool cutting error usually used methods are:     1. Use with sufficient precision and stiffness of the machine.     2. If necessary, you can take the compensation correction method, such as in the thread grinder or hobbing machine, according to the previously measured machine tool chain error error correction device to correct the machine drive system error.     3. Eliminate the vibration source inside the machine and take vibration isolation ...

    Seamless steel tube, from its spelling, we can see that it has no weld.So it can bear high pressure or high temperature working condition. Forming process for seamless steel pipe can be casting or cold drawing.     Precision steel pipe need more advanced technology, so it just been applied in recent years. Also from the spelling, we can see that there will be much less tolerance for precision steel pipe, this includes OD tolerance, WT tolerance, roundness tolerance, length tolerance, weight tolerance, etc.     Cold drawn precision steel pipe features:     1. Complicated cross section.     2. Accurate precision and good surface quality.     3. MOQ is much less than normal carbon steel pipes.     4. OD will be smaller.     Generally speaking, for small OD with strict tolerance range, it would be better if we choose to go by precision steel pipe, especially for industrial steel pipe or steel ...

    SMLS steel pipe is mainly used for petrochemical cracking pipe, boiler tube, pipe, automobile bearing, petroleum geology drill pipe, tractor, aviation and other precision structure pipe.     Small OD SMLS steel pipe is widely used for both side submerged arc welded manufacturing technology. Small OD SMLS steel pipe’s manufacturing process can be bending, internal welding, commissural, external welding, straightening, flat top multi-channel, etc, to achieve API standards.     Large OD with thick wall can be used in all kinds of construction site and make the body supporting portion. For example bridge support, offshore piling, and other building pile.Also, it can also used for liquid transportation.     http://www.xysteelpipe.com/info/Application-of-different-outer-diameter-SMLS-pipe-1038-1.htm

    Hot rolling is made of slab (mainly blank) and heated by roughing mill and finishing mill.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 af...

    1. Carbon seamless steel pipe quality inspection and acceptance by the supplier technical quality supervision department     2. The supplier must ensure that the delivery of steel pipe in accordance with the provisions of the corresponding product standards. The purchaser shall have the right to inspect and inspect the product according to the relevant product standards     3. Carbon seamless steel pipe inspection items, sampling number, sampling sites and test methods, according to the provisions of the corresponding product standards. The consent of the demand side, hot-rolled seamless steel tube can be sampled by rolling the root array.     4. Carbon seamless steel pipe should be submitted in bulk acceptance, the group approved the rules should be consistent with the provisions of the corresponding product standards.     5. Carbon seamless steel pipe test results, a non-compliance with product standards, should be unquali...

Carbon seamless steel pipe is generally in the automatic production of rolling pipe unit. The solid 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 in furnace, perforation in the punch.continue to rotate and move when perforation, 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. If you want to get smaller and better quality of seamless tubes, it must be cold-rolled, cold drawn or a combination of the two methods. Cold rolling is usually carried out on a two-roll mill, in which the steel pipe is rolled in an annular orifice fo...

    The higher the pressure of the conveying medium, the thicker the pipe is, and the higher the requirement of pipe material.     Medium pressure above 1.6MPa, the choice of seamless steel pipe or non-ferrous metal pipe. High pressure, such as ammonia, urea and methanol production, and some pipe media pressure up to 32MPa, the general choice of materials for the 20 steel or 15MnV high-pressure seamless steel pipe. In the vacuum equipment on the tube and the pressure is greater than 10MPa when the oxygen pipe, generally use brass and brass.     Medium pressure below 1.6MPa, may consider the use of welded steel pipe, cast iron pipe or non-metallic pipe. But the cast iron pipe to withstand the pressure of the medium shall not be greater than 1.0MPa. Non-metallic pipe can withstand the medium pressure, and non-metallic materials, such as hard PVC pipe, the use of pressure is less than or equal to 1.6MPa; reinforced polypropylene pipe, the use of pressure ...

    In addition to scratches on the surface of the high-frequency welded steel pipe caused by the guide rollers, there is also a scratch caused by the squeezing roller. This type of scratch occurs mainly at the bottom of the tube. There are roughly three reasons for this, as follows:     First, the hole type does not match     Caused by high-frequency welded steel pipe surface scratches and holes are not consistent with the factors:     1.Squeeze roller bearing damage;     2.Squeeze roll hole size is not the same;     3.squeeze roller axial turbulence;     4.The height of the two squeeze rollers is different;     54 extrusion roller shaft bending and assembly instability.     Second, the squeeze roller height does not match     The lower edge of the squeezing roll pattern should correspond to the height of the rolling line, and the height of the guide roll is determined ...

    OCTG pipe refers to Oil Country Tubular Goods, a collection of rolled metal products, more commonly known as drill pipe, casing and tubing which are manufactured according to API specification. It used both onshore and offshoreiIn petroleum industry.     Drill pipe is a seamless tube that rotates the drill bit and circulates drilling fluid. It is hollow to allow drilling fluid to be pumped down the hole through the bit and back up the annulus. The annulus of an oil well is the space between any piping tubing or casing and the piping, tubing or casing immediately surrounding it. The presence of an annulus gives the ability to circulate fluid in the well. Drill pipe is subjected to high torque by drilling, axial tension by its dead weight and internal pressure by purging of drilling fluid.     Tubing is the pipe that goes inside the casing pipe. This is the pipe that the oil itself will eventually make its way out of. The most simplistic of the OCTG f...

    In all steel pipe, ASTM A53 seamless steel tube occupies a large proportion, but the actual production of seamless steel pipe is often used in controlled rolling and cooling technology, easy to control the process of cooling due to uneven cooling plate defects, seriously affecting product quality and contract cash . Plate side wave is one of the more serious one.     Seamless steel tube side of the wave-shaped defects are due to uneven cooling caused by lateral. On-site tracking found that there are obvious on both sides of the side wave plate "band-shaped supercooled" area. The transverse cooling caused by uneven factors are:     1) There are transverse temperature differences between the center and the sides of the seamless tube.     2) seamless steel pipe in the controlled rolling process, the middle and edge there is a large temperature difference.     3) The finish rolling mill adopts "CVC" rolling process, which is cau...

    Fracture of high frequency straight seam welded pipe, hydraulic (pneumatic) parts used in the design of mechanical properties, brittle fracture and the use of components related to temperature.     It is found that when the temperature is lower than a certain temperature value, it is found that the data will change into brittle state, the impact absorption work decreased significantly, this phenomenon is called cold brittle, high-strength metal materials occurred in the low stress brittle fracture The organization of the data is far from uniform isotropic tissue will have cracks, there will be inclusions, pores and other defects, these defects can be seen as micro-cracks in the material. Therefore, the design should also be based on the operating temperature of the component to select the appropriate data of the cold and brittle transition temperature.     In general, it is assumed that the data is uniform and continuous isotropic. According to this...

    For the ω (Als ≤ 0.01% straight seam welded pipe , the use of two deoxidizer on the VD treatment of steel in the total oxygen impact is small, can be ω (T.O control in the 20 × 10-6 below; Si-Al-Ba deoxidation After the process can be a lower total oxygen content, the process of deoxidation effect is stronger than Si-Ca deoxidation effect.     When the Si-Ca and Si-Al-Ba two kinds of deoxidizer are used in the high-frequency straight seam welded pipe, the number and size of the inclusions in the smelting process are quite different. The number of inclusions in Si-Al-Ba Less than Si-Ca after deoxidation, and smaller size.     When Si-Ca and Si-Al-Ba are used in the high-frequency straight seam welded pipe, the secondary oxidation of the molten steel occurs during the casting process, but the secondary oxidation of Si-Al-Ba deoxidized molten steel is more serious.     The inclusions in the forging material differ greatly from those in the ...

    With the development of urbanization, there is no doubt that modern house has replaced the old fashioned one already. And there are new demands for sewage steel pipes in housing project whether you use seamless steel pipe or welded steel pipe.     Choosing project:     Which kind of steel pipe we would like to choose for sewage use? From the aspect of costing, the welded steel pipe like carbon steel pipe would be on the top of list. As we all know, seamless steel pipe is a little bit expensive than other steel pipes. And for function, seamless has limit OD since the production and welded steel pipe has large OD relatively which is better when used in transporting the sewage.     Demands for sewage steel pipe:     What kind of demand would be applied in sewage steel pipe? Here are some factors we can take a note. Good chemical resistance, good insulation and density, electro chemistry, and preventing stray current corrosion, ...