Seamless Steel Pipe

　　High frequency welded straight-seam pipe is used in high-frequency welding of the welding method，which is based on the principle of electromagnetic induction, and AC charge in the conductor, the skin effect, the proximity effect and eddy current heating effect, so that the weld edges of the steel locally heated to a molten statewheel squeeze butt welds to achieve the crystalline aggregate indirect, so as to achieve the purpose of the welds. 　　High frequency welding is an induction welding (contact or pressure welding), it does not require the weld filler, no spatter, weld heat affected zone is narrower, welding forming beautiful, good welding machinery, etc., in the production of steel pipes by a wide range of applications, also including widely used in civil construction, petrochemical, light industry and other sectors, and to this end also to achieve the maximum benefit of the national economy! 　　Electric Resistance Welded steel pipes, ERW steel pipes or high frequency welded ...

　　Eddy Current testing machine range of applications: 　　1,Specimen geometry: shape, size, thickness of the like. 　　2,Conductivity: chemical composition, hardness, stress, temperature, heat treatment and so on. 　　3,Discontinuous defect: cracks, inclusions, porosity, delamination, uneven material. 　　4,Permeability: ferromagnetic materials heat treatment, chemical composition, stress, temperature and the like. 　　Eddy Current testing machine advantages: 　　First, for the detection of metal pipes, rods, wire and plate, without touching, does not require a coupling medium, so that a high detection speed, easy to automate the detection, especially for online inspection P; followed by high sensitivity for the detection of defects, and within a certain range a good linear indication of the size of the different defects can be evaluated, so can be used as quality management and control, such as cracks, material, size, shape and electrical conductivity and permeability; the third, sinc...

　　Demolition work for scaffolding products from scaffolding plank to little part like scaffolding base jack is high demand job. It is not just for the high technical requirements for the whole process as well as the dangerous operation process. Thus, in order to keep our safety, we have to do it with the right procedure. For hunanworld, we can provide the plan details for the whole demolition. 　　First of all, investigating the around working environment before the demolition is necessary. Then, we shall detect the shelf itself from connecting rods, working conditions. Meanwhile, we should organize teams to make a communication and division of each shift. Removal of high-rise scaffolding should have a demolition plan, and the work should be carried out according to the program requirements. 　　Then, shelf and scaffolding systems’ demolition should be delimited the operation area. At the same time, the demolition area shall set up a ring like a warning sign or set a special person to...

　　L80 oil casing flat end, round thread without coupling or with coupling, partial trapezoidal thread with coupling or without coupling, direct connection thread, special end processing, seal ring structure. There are 10 types of L80 petroleum casing pipe steel grades H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110, and Q-125. Mainly used for oil well drilling. 　　Introduction to performance inspection of L80 petroleum casing: 　　1. Physical performance test 　　(1) According to SY / T6194-96. For flattening test (GB246-97) tensile test (GB228-87) and hydraulic pressure test. 　　(2) Hydrostatic test, flattening test, sulfide stress corrosion cracking test, hardness test (as specified in the new ASTME18 or E10 version), tensile test, and transverse impact test (according to the American Petroleum Institute APISPEC5CT first edition of 1988) ASTMA370, ASTME23 and related standards are required to be carried out), grain size measurement (ASTME112 new version or other methods). 　...

　　Scaffolding products from scaffolding plank, scaffolding base jack, scaffolding coupler , frame scaffolding and so one are now widely used among each kind of engineering projects. However, taking scaffolding plank for example, how could we guarantee the high quality when we produce them? 　　Today, hunanworld, the global large-scale steel production enterprise, which is committed to global customers with high quality steel products and services, shall share the requirements for the production of each component part of scaffolding products. 　　First of all, the surface of the scaffolding’s casting should be smooth without sand holes, shrinkage holes, cracks, residual defects and so on. This is the first step to keep the wonderful appearance of the item. 　　Then, the steel pipe used among scaffolding equipment shall be straight, with the allowable deviation of straightness being 1/500 of the length of the pipe, and the two end faces shall be smooth without inclined mouth or burr. 　...

　　Galvanized seamless steel pipes have very little galvanizing, only 10-50g/m2, and their corrosion resistance is much worse than that of hot-dip galvanized pipes. Regular galvanized pipe manufacturers use quenched galvanized pipes as water and gas pipes. The galvanized layer of the cold-galvanized steel pipe is an electroplated layer, and the zinc layer and the steel pipe base are separately layered. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe base and is easy to fall off. Therefore, its corrosion resistance is poor. In newly built houses, the use of cold-galvanized steel pipes as feedwater pipes is prohibited. 　　Anyone who has been in contact with galvanized seamless steel pipes for a long time will analyze the appearance of galvanized seamless steel tubes from the appearance of galvanized seamless steel tubes. 　　Made a detailed summary: 　　The galvanized seamless steel tube galvanized layer is passivated by chromate to improve corrosion resis...

　　L245 spiral steel pipe is made of strip steel with material L245. The standard is API SPEC. L245 spiral steel pipe is mainly used for gas, water and oil transportation in natural gas industry. What are the characteristics of this material? 　　L245 is a low-pressure fluid coiled tube with the same performance as the #20 seamless tube. 　　Mechanical properties and chemical composition of L245 　　Mechanical properties: 　　Yield strength: 245 MPa 　　Tensile strength: 415 MPa 　　Chemical composition: C: 0.26 Mn: 1.15 S : not more than 0.030 P: not more than 0.030 　　If the mark is N in the L245NB, the steel that is L245 is deformed and normalized. B means grade B steel pipe.

　　The calculation formula for the pressure that the welded pipe can withstand: 　　P=(2*σ/S*δ)/D 　　Among them: the pressure is P, the tensile strength is σ, S is the safety factor, the wall thickness is δ, and the outer diameter is D. 　　for example: 　　DN=10MM, wall thickness is 3mm, what is the maximum pressure of seamless steel welded pipe? 　　The tensile strength of the material is σ, the pressure is P, and the outer diameter is D; 　　Welded pipe wall thickness δ=(P*D)/(2*σ/S) 　　S is the safety factor; 　　Because P is less than 7 MPa, S selects S=8; P is less than 17.5 MPa, S selects S=6; P is greater than 17.5 MPa, and S selects S=4; 　　We choose the safety factor of S=6; the tensile strength of 20 steel is 410MPa. 　　Therefore, the pressure that the welded pipe can withstand 　　P=(2*σ/S*δ)/D 　　=(2*410/6*3)/(10+6) 　　=26.25MPa>Set 17.5MPa 　　Therefore, the safety factor is taken as S=4 　　Therefore, the pressure that the welded pipe can withstand P=(2*σ/S*δ)/D...

　　With the development of oil well gas drilling operations to more severe working conditions such as deeper, higher pressure and higher temperature, and the continuous improvement of oil drilling technology, conventional oil casing pipe threads are difficult to meet the development needs of oil fields. 　　At present, there are more and more high-pressure oil and gas wells. The ordinary API threaded tubing can not meet the requirements of high-pressure sealing. For oil and gas wells with pressure higher than 28MPa, most of them choose gas-tight special buckle type tubing. As more and more H2S/CO2/Cl- containing oil and gas wells will be put into development, ordinary low-carbon low-alloy steel tubing cannot adapt to harsh corrosive environments, and the service life of tubing cannot meet the design requirements of oil and gas wells, so 9Cr, 13Cr. The application of corrosion-resistant material tubing such as 22Cr and 25Cr is also becoming more and more extensive.

　　Electric fusion welding is the joining of metals by heating the metal between one or several consumable electrodes and the workpiece.Electric resistance welding is a welding that uses a strong current to pass through the contact points of the electrode and the workpiece, and heat is generated by the contact resistance. 　　The arc of the electric fusion weld melts the metal and the filler material without the need for pressurization, and the filler metal portion is entirely from the electrode. 　　Electric resistance welding is a type of welding method that uses resistance heat as an energy source, including electroslag welding with slag resistance heat as energy source and electric resistance welding with solid resistance heat as energy source. 　　Electric resistance welding often uses a large current. In order to prevent arcing on the contact surface and to forge the weld metal, pressure is always applied during the welding process. 　　Extended information: 　　Welding is achieve...