LSAW Steel Pipe

　　Generally speaking, hydraulic (pneumatic) part in planning the use of mechanical performance, data are assumed to be uniform, successive, isotropic, according to the analysis of this approach is safe and that the plan will sometimes spiral steel pipe unexpected trouble cracking attack. 　　Study found that the use of brittle cracking and also member of the relevant temperature. After discussions we found that when the temperature drops below a certain temperature, brittle materials will change the situation, the impact absorbed energy decreased, this representation is called cold crisp, high-strength metal resources guessed low stress brittle episodes cracking process, the data arrangement is far from uniform, isotropic. Arrangements have cracks, there will be inclusions, porosity and other drawbacks can be funded look into guessed microcracks. Therefore, even when the program based on the operating temperature of the member to choose a suitable cold brittle temperature change infor...

　　Hot rolled seamless steel tube: hot rolling is related to the cold drawn, hot rolling is performed above the recrystallization temperature of the rolling. 　　 Hot-rolled seamless steel tube process: 　　Round tube perforation → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage 　　 Hot-rolled seamless steel tube advantages: 　　Ingot casting can destroy tissue, grain refinement of steel and eliminate defects microstructure, so that the steel dense tissue mechanical properties are improved. This improvement is mainly reflected in the direction along the rolling direction to a certain extent, the steel is no longer isotropic; pouring formed bubbles, cracks and loose, can be welded at a high temperature and pressure. 　　 Hot-rolled seamless stee tube disadvantages: 　　1. After hot rolling, the steel inside the non-metallic inclusions (mainly sulphide and oxide, and silicates)...

　　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 insoluble...

　　The ERW welding machine technology is used to realize the high frequency welding of the electromechanical system. The high-frequency welding equipment is composed of a high-frequency welding machine and a forming machine. A high frequency welding machine is usually made up of two parts of high frequency generator and feed device. The effect is to produce high frequency current and control it. By extrusion roll frame, the function of the molding machine is high frequency current. The extrusion and melting part eliminates the oxide and impurities on the surface of the steel and makes the steel plate completely integrated into one. 　　 ERW pipe 　　High frequency generator 　　In the past, the use of high-frequency welded pipe unit is the three loop: high-frequency generator; solid state inverter; electronic high-frequency oscillator, and then basically improved to a single loop. There are many ways to adjust the output power of high frequency oscillator, such as autotransformer, react...

　　Defects in the J55 oil casing fusion zone: 　　After the ERW oil casing, the weld pipe in the heat affected zone of the fusion line was found to be unqualified. The metallographic analysis, scanning electron microscopy, and process investigation were performed. The results showed that the J55 welded pipe was in the fusion line. There is a certain depth of crack defect in the edge of the original plate in the heat-affected zone. The user has a significant expansion of the crack defect due to the small pipe diameter and the insufficient amount of trimming in the pipe making process. The cracks in the edge of the hot-rolled original plate originate from cast slab corners and side subcutaneous bubbles.

　　Welded pipe is generally divided into straight seam welded pipe and spiral welded pipe two types. 　　 Hydrostatic burst strength 　　By the relevant comparison test to verify the spiral welded pipe and Longitudinal yield pressure and burst pressure measured and theoretical values ??match, the deviation closer. But whether it is the yield stress or burst pressure, were lower than the Longitudinal spiral welded. Burst test also shows that the rate of deformation ring spiral welded pipe bursting Longitudinal significantly greater than the mouth. Thus confirmed that the spiral welded plastic deformation capability than Longitudinal, blasting mouth generally confined to a pitch, which is the extension of the spiral weld to rip from a strong binding effect due. 　 　Strength characteristics 　　When the pressure in the pipe withstand, usually two main stress on the wall, that the radial and axial stress stress δ. Synthetic weld stress δ, where α is the helix angle of the spiral weld pipe....

　　The straightening method of DSAW tube: 　　One, the DSAW tube is bent in the same direction 　　Reason: Welding normalization is insufficient, the pipe has thermal stress on the welding side, and bent in one direction after cooling. 　　Solutions: 1, adjust the middle roller, properly increase the deflection curve; 2, two straightening; 3, the whole tempering pipe can not be straightened directly. 　　Two. The DSAW tube is unrule bending 　　Reasons: 1. the pressure between the three rollers is not consistent; 2. the straightening roller wears a lot. 　　Solution: check whether the adjustment of the straightening roller is loose, and use the sample rod to straighten the contact line length between the three. 　　Third, the length of the DSAW tube is short 　　The reason is that the angle of the three roller straightening roller is different, and the straightening pressure is larger. 　　Solution: adjust the rolling angle as much as possible and adjust the straightening pressure prope...

　　The effect of roller adjustment on the quality of ERW has a process called roller adjustment when producing ERW pipes. During the production process, the roller is damaged or worn seriously. It is necessary to replace the unit on the part of the roller, or to produce a certain number of rollers continuously to meet the needs of the replacement of the whole roller. At this point, the roller should be adjusted to achieve excellent steel quality. If the roll adjustment is not good, it is easy to form the change of steel pipe seam, lap welding, edge wave, indentation or scratch on the surface of drum and pipe body, elliptical steel pipe and so on. Therefore, the roll adjustment prompt should be mastered when the roll is replaced. 　　1, replacing the standard steel pipe is usually the whole volume that needs to be replaced. The way of roller conditioning is to draw a baseline from the inlet to the outlet by adjusting the wire, so that each hole is located on the baseline and the molding ...

　　The straightening method of DSAW tube: 　　One, the DSAW tube is bent in the same direction 　　Reason: Welding normalization is insufficient, the pipe has thermal stress on the welding side, and bent in one direction after cooling. 　　Solutions: 1, adjust the middle roller, properly increase the deflection curve; 2, two straightening; 3, the whole tempering pipe can not be straightened directly. 　　Two. The DSAW tube is unrule bending 　　Reasons: 1. the pressure between the three rollers is not consistent; 2. the straightening roller wears a lot. 　　Solution: check whether the adjustment of the straightening roller is loose, and use the sample rod to straighten the contact line length between the three. 　　Third, the length of the DSAW tube is short 　　The reason is that the angle of the three roller straightening roller is different, and the straightening pressure is larger. 　　Solution: adjust the rolling angle as much as possible and adjust the straightening pressure prope...

　　There are many ways to connect carbon seamless steel pipe, and now several commonly used methods are listed: 　　a, compression type; b, live connection; c, compression; d, push; e, taper thread; f, socket welding; g, live flange connection; welding and welding and the traditional combination of the derivative Series of connections. 　　Different connections, because of their different production principles, their application areas are also different, but generally speaking, one thing in common is that it is convenient to install, reliable and reliable. 　　Here are some more common links to make a brief introduction: 　　1. compression: insert the tube into the pipe, fasten it with the nut, compress the mouth of the casing through the seal ring with the screw force, and seal the function, then the connecting pipe can be completed. 　　2.flanges: flanges and pipes are used for TIG welding, fastened with fasteners or bolts, sealing between flanges and sealing. 　　3. welding type: pip...

    If it is drinking water, IPN8710 anticorrosion spiral pipe is needed for water transportation. The IPN8710 anticorrosion spiral tube is composed of waterborne aliphatic polyurethane prepolymer and epoxy resin, high quality pigment, additive and solvent. It is specially used for food, drinking water and other equipment contact, pipeline water pipe, drinking water tank surface corrosion.     The main material of spiral pipe is carbon steel and pipeline steel series x42-x70. Storage of water supply spiral pipe products on site or warehouse should be selected in a clean and clean place away from harmful gas or dust in the production plant. Remove weeds and all debris on the ground and keep the steel clean.     There are many corrosive media for water transportation and supply. There are acids, bases, salts, oxidizers and steam. The coating must be chemically inert and acid and alkali resistant. The coating has compact structure, good water permeability...

    There is thermal stress and tissue stress in the heat treatment of seamless steel pipe. The internal stress can be superimposed or partially offset, it is complex and changeable, because it can change with heating temperature, heating speed, cooling speed, cooling speed, shape and size of parts, so the heat treatment deformation is inevitable. The mechanical collision of the seamless steel pipe in the heat treatment process can also cause the deformation of the parts, but the deformation can be improved with the operation, thus reducing and avoiding.     1, surface decarbonization     In the process of heat treatment, if the seamless steel tube is heated in the oxidation medium, the surface will be oxidized by some surface, thus reducing the quality of carbon and leading to the decarburization of the surface. The surface decarburization depth will exceed the final processing volume and scrap parts will be scrapped. Determination of surface decarburi...

    What Is The Classification And Grades Of Drill Pipes ?     Oil drill pipe is seamless tubing which was used to rotates the drill bit and circulates drilling fluid in the well. API spec. 5DP specifies the technical delivery conditions, size, weight, grade, material properties and other requirements for drill pipe. The standard gives us the guidelines for inspection & classification of your used drill pipe string. Dill pipe can be divided into following levels, classes and grades:     PSL-1: Specifies wall thickness, impact strength, and yield strength requirements specific to the material grade.     PSL-2: Additional mandatory requirements.     PSL-3: Additional mandatory requirements.     Drill pipe class defines the physical condition of the drill pipe in term of dimension ,surface damage and corrosion.     Class 1(New class) : Brand new (never used) and the strongest.     Premium(used...

    Spiral welded steel pipes are widely used in oil, natural gas, water and other flammable & nonflammable liquid conveyance and distribution pipelines, steel structures for construction and other general purposes by means of their wide size range.     a. Molding process, the steel deformed uniformly, spiral steel pipe, residual stress, the surface does not produce scratches.Spiral steel pipe processing diameter and wall thickness in the range of sizes for greater flexibility, especially in the production of high grade thick-walled pipe, spiral steel pipe, especially small and medium-diameter thick-walled tube has advantages over other processes,to meet user specifications in steel demand more.     b. The use of advanced double-sided submerged arc welding process, welding can be achieved in the best position, less prone to the wrong side, partial and incomplete penetration welding defects, easy to control weld quality.     c. 100% of th...