steel pipe

　　As a seamless steel pipe supplier, Prime Steel Pipe has the most comprehensive methods to test seamless steel pipe defects. Next, Prime Steel Pipe will share that for you. 　　1. Generally we use magnetic particle testing or soak detection to test appearance defects such as crack, folding, heavy skin, hair grain, pinhole. For ferromagnetic material, magnetic powder assay should be adopted preferentially, because it has higher flexibility of detection, for non-ferromagnetic material, such as stainless seamless steel pipe, soak test is used. 　　2. For steel pipe end defects, when obligate excision allowance is fewer, for the structural reasons of detection installation, the two ends sometimes can not get useful testing, which is the most likely to crack or other defects existing sites. If there are latent crack points, the welding heat may also lead to crack propagation. Thus, after butt we should also pay attention to the detection of will surely area of seamless steel pipe, and dul...

　　Generally, seamless steel pipe defects are crack, fold, double skin, hairline, pinhole, etc.. 　　When both ends of the reserved resection margin less, due to the structural reasons of the detection device, both ends of the head and sometimes the lack of effective testing, the end is most likely there are cracks or other defects in the site. End there is a potential crack tendency, the installation of the weld heat affected may also be potential crack propagation. Therefore, it should be noted that the detection of a certain region of the welded seamless steel pipe, the timely detection of defective expansion of the pipe ends. 　　Magnetic particle testing, penetrant testing can be effectively found that the surface crack, fold, double skin, hairline, pinhole surface defects. Ferromagnetic material, should give priority to the use of magnetic particle testing method, because it has a high detection sensitivity; non-ferromagnetic material such as stainless steel seamless pipe penetra...

　　At present, spiral steel pipe is widely used in our life. What are the advantages and disadvantages of spiral steel pipe? 　　Spiral steel pipe is a kind of spiral steel pipe which is formed by spiral bending of strip or coil plate and welded by double-sided submerged arc automatic welding for inner and outer seams. It can be widely used in water, electricity and chemical industry for the following reasons: 　　1. Easy to adjust. As long as the forming angle is changed, steel pipes of various calibers can be produced with coils of the same width. 　　2. Because it is formed by continuous bending, the length of helical tube is not limited and can be determined at will. 　　3. The spiral shape of weld seam distributes evenly around the whole spiral pipe, so the spiral pipe has high dimensional accuracy and strong strength. 　　4. Easy to change size, suitable for small batch, multi-variety spiral tube production. 　　The weld seam of the spiral steel pipe is longer than the weld seam o...

　　Tube billet is the key raw material in manufacturing process, is the solid round bar of steel used to produce many pipe products. 　　 ERW steel pipe is manufactured by cold forming the steel coil into a round cylindrical pipe. Current passes between the two edges of the steel to heat the steel to a point at which the edges are able to connect together to form a bond using the actual welding process. ERW is normally used to transport liquid, such as petrol and gas, playing a significant role in the world line pipe transporting area. 　　Seamless steel pipe (also called SMLS) refers to a hollow steel pipe having no seam around. Due to its unique feature of strength and anti-bending, seamless pipe is widely used in construction, oil refining and chemical industries. 　　The ERW pipe tube billet is made of hot-rolled steel strip with cold rolling process while the seamless pipe tube billet is produced in hot rolling condition. The situation where seamless pipe tube billet is produced h...

　　For certain special purpose steel pipe, in order to ensure the requirements of the organization of the state and physical and mechanical properties for certain special purposes, there must be a certain way of cooling and the cooling system. For example, Carbon steel pipe cooling time is the main basis to determine the length of the cooling bed. Steel pipe cooling by radiation and convection heat, proved steel temperature above 500 degrees celsius, mainly by heat radiation. 500 degrees celsius below the convection heat conduction based. It can be considered in order to reduce the the steel cooling time to reduce the cooling bed length, and to improve the operating conditions of the workshop, the forced air cooling bed. A strong urgent need in a 500 degrees celsius.Ventilation cooling time can be reduced by 40-50%. 　　Cooling ways of carbon steel pipe: 　　The pipe cooling mode vary depending on the chemical composition of the steel pipe, size, and the desired mechanical properties, ...

　　 Galvanized pipe coating process 　　A continuous galvanized pipe coating production technology and equipment, and the process includes the following steps: passivation, cleaning; paint; curing, with drying preheating before coating, and the drying preheating temperature is about ±20 ℃ of the curing temperature. The device is based on the known device, before the dip-coating slot with drying preheating furnace. The process and equipment can not only in bulk for continuous galvanized pipe paint production, but also ensure the quality of paint, the surface no bubbles, no orange peel, efficiency can be improved twenty or thirty times. 　　Hot dip galvanizing production difficulty is steel leakage defect, zinc layer falls off and edge thick. 　　 1. Steel leakage defect 　　In order to reduce cost and increase the strength of steel, much more silicon are often be added to the steel base. The exceeded silicon can increase the surface tension, reduce the steel plate to the zinc liquid wet...

　　PE pipe fittings have the strongest development momentum in China's plastic pipes, its scope of application is wide for now. The main application markets are water supply pipes and gas pipes. The following is a brief introduction to the main features of PE pipe fittings. 　 　Main features: 　　1. Long service life. Under normal conditions, the minimum life span is 50 years. 　　2. Good hygiene. PE pipe is non-toxic, it does not contain heavy metal additives, scale, or breed bacteria, which solves the problem of secondary pollution of drinking water. It complies with the GB/T 17219 safety evaluation standard and the relevant health safety evaluation regulations of the Ministry of Health. 　　3. It can resist corrosion of various chemical media; no electrochemical corrosion. 　　4. The inner wall is smooth, the friction coefficient is extremely low, the passing ability of the medium is correspondingly improved and the wear resistance is excellent. 　　5. Good flexibility, high imp...

　　In some high-intensity work environment, large-diameter seamless steel pipe may deform. So how to straighten large diameter seamless steel pipes? The best way is to use steel pipe straightening machine. Steel pipe straightening machine is used for metal profiles, bars, tubes, wire, etc. Here we will introduce operations and attentions of steel pipe straightening machine to correct large diameter seamless steel pipes. 　　1. Before starting, check the hydraulic oil box, gear box is full or not. 　　2. Before starting the main motor, adjust the hydraulic system pressure. 　　3. Lubricate every smooth point and ensure the work of the mechanical transmission is sensitive. 　　4. After the oil pressure reaches stable. The straightening rollers should be lifted to the initial position. 　　5. Put the large diameter seamless steel pipe on the third straightening roller. 　　6. Start the main motor, large diameter seamless steel pipe will rotate with straightening. 　　7. Stop the motor and...

　　Tips for choosing good quality seamless steel pipes. 　　1. As for good quality seamless steel pipes, its cross section should be smooth and even. If you see there is burr or uneven cross section, do not pick up these defective seamless steel pipes. 　　2. You need to know the percent of impurities. Weight the pipes and measure its density. If it is low density, light seamless steel pipes will be poor quality. 　　3. Check trademark. There will be standard trademark and words on seamless steel pipe from good quality seamless steel pipes manufacturers. 　　4. Check the shape of seamless steel pipes. As for poor quality pipes, you will find oval shape on the side of it. 　　5. Check the surface of seamless steel pipes. Bad rolling technology produce rough surface seamless steel pipes. Do not choose poor surface seamless steel pipes.

　　1, In order to prevent corrosion of eye is generated due to a flange cover heating, welding current should keep should not be too big, than carbon steel electrode less than 20%, arc should not be too long, interlayer fast cooling, a narrow weld bead is appropriate. 　　2, The use of the electrode should be keep the drying, titanium calcium type should keep drying 150 DEG C for 1 hour and a low hydrogen type should be kept between 200 and 250 DEG C and dried for 1 hour, prevent electrode viscous oil and other dirt, so as not to cause the weld increase with carbon content, and the influence of welding quality. 　　3, Flat welding flange pipe welding by repeated heating and carbide precipitation and reduce the resistance and the mechanical properties of the corrosion properties of the product. 　　4, Crome flange pipe after welding of flange American Standard hardening is large, easy to crack. If the same type of chromium stainless steel welding rod (G202, G207) welding, must be more th...

　　Common annealing processes are: 　　1, fully annealed. It is used to refine the coarse superheated structure of medium and low carbon steel which has poor mechanical properties after casting, forging and welding. The workpiece is heated to a temperature of 30 to 50°C above the temperature at which all of the ferrite is transformed into austenite, and is kept for a period of time, then slowly cooled with the furnace, the austenite is transformed again during the cooling process, so that the microstructure of the steel is thinned. 　　2, spheroidizing annealing. It is used to reduce the high hardness of tool steel and bearing steel after forging. The workpiece is heated to a temperature of 20 to 40°C above the temperature at which the steel begins to form austenite, and is slowly cooled after the heat preservation. During the cooling process, the lamellar cementite in the pearlite becomes spherical, thereby lowering the hardness. 　　3, isothermal annealing. It is used to reduce the hi...

　　 LSAW steel pipe is formed by the surface layer of very thin and strong stability of fine chromium-rich oxide film (protective film), to prevent the continued infiltration of oxygen atoms, to oxidation, and access to anti-corrosion ability. If there is some reason, this film was the constant destruction, air or liquid oxygen or metal atoms will continue to penetrate the iron atom out from the constant analysis of the formation of loose iron oxide, metal surface corrosion will be constantly . This surface film in the form of a lot of damage, more common in everyday life are summarized as follows: 　　1. LSAW steel pipe surface deposit product with other metals containing dust particles or heterogeneous metal fixtures in the humid air, and stainless steel fixtures between the condensate, the two together into a micro-battery, causing the electric chemical reactions, protective film is damaged, call it that electrochemical corrosion. 　　2. Straight pipe surface adhesion organic juice ...

　　What’s galvanized pipe fitting? Well, generally, it is an iron or steel sheet fittings with a zinc coating to prevent corrosion and rust. When comes to galvanized steel pipes , fittings and other structures, strong and desirable in different situations. We can find a lot of advantages in pipes and fittings. 　　Long life is the first advantage for galvanized steel pipe, fittings are known for their long life. 　　1. High quality, anti-corrosion & rust. 　　2. Easy inspection is another added advantage of taking the adoption of galvanized and fittings. You can see the production date and brand in ADTO product. The inspection process is extremely simple and straightforward. 　　3. Fast assembly is also another added advantage of such pipes and fittings. Good quality steel needs to be treated right. There are various benefits and advantages of Galvanized pipe fittings.

　　 Boiler tube hardness is one very important factor to determine the quality of high pressure boiler tubes. 　　First, it must be considered to detect the mechanical properties of hardness high pressure boiler tubes, because it is the relationship between the performance and quality of deformation, punching, cutting and other processing problems. So first of its hardness testing should detect its mechanical properties. Detection methods generally tensile test and hardness test. Tensile test, that is, to the high-pressure boiler tube sample preparation, but also in a tensile testing machine will stretch until the specimen breaks, so you can measure the tensile strength of the high-pressure boiler tubes, yield strength, elongation after fracture and reduction. Tensile tests in the metallic material is often carried out detecting means, is not easy for many hardness test, tensile test must be carried out. There are several hardness test method: like scarification, pressed into law, powe...

　　Quality inspection method for A335 P11 alloy steel pipe 　　1.A335 P11 alloy steel pipe chemical composition analysis: chemical analysis, instrumental analysis (infrared C-S instrument, direct reading spectrometer, zcP, etc.). 　　① infrared C-S instrument: analysis of ferroalloy, steelmaking raw materials, steel in the C, S elements. 　　② direct reading spectrometer: C, Si, Mn, P, S, Cr, Mo, Ni, Cn, A1, W, V, Ti, B, Nb, As, Sn, Sb, Pb, Bi 　　③ N-0 instrument: gas content analysis N, O 　　2.A335 P11 alloy steel pipe geometry and shape inspection: 　　①A335 P11 alloy steel pipe wall thickness check: micrometer, ultrasonic thickness gauge, both ends of not less than 8 points and recorded. 　　②A335 P11 alloy steel pipe diameter, ovalness check: card gauge, vernier caliper, ring gauge, measured the maximum point, the smallest point. 　　③A335 P11 alloy steel pipe length inspection: steel tape, artificial, automatic length measurement. 　　④A335 P11 alloy steel pipe bending check: rul...

　　 Steel pipes are used in many different ways both for commercial and personal use. There are many different methods for cleaning steel pipes. Choose the method that works best for you and your needs. If that method doesn't work as desired, move onto a different method. 　　Chemical cleaning: chemical cleaning of pipe refers to temporarily transformation of the pipeline using chemical agents, adopt chemical cyclic cleaning using temporary pipeline and circulating pump station from both ends of the pipeline. The technology has features such as strong flexibility, high speed, thorough cleaning and having no request of the shape of pipes, etc. Chemical cleaning is complete, but the residues must be cleaned up. Otherwise it will have effect on later running. 　　PIG operation: PIG industry technology produces the driving force relying on pump driving fluid to drive PIG in the tube to push forward, discharge the accumulated dirt in the pipe, so as to achieve the purpose of cleaning. T...

　　The method for quality inspection of LSAW pipe , in which the physical method is the most commonly used inspection method, physical examination is a physical phenomenon to determine or check the application of the method. 　　 Magnetic force 　　Magnetic flaw detection can only find the shortcomings of the appearance and appearance of the magnetic straight seam welded pipe. The disadvantages can only be quantitatively analyzed. The nature and depth of the flaw can only be estimated based on experience. Magnetic flaw detection is the use of magnetic field to discover the leakage of magnetic longitudinal weld seams. According to the method of measuring magnetic flux leakage, it can be divided into magnetic powder method, magnetic induction method and magnetic recording method, in which the magnetic powder method is the most widely used. 　　Soak inspection 　　Penetration testing is the use of some liquid physical properties such as permeability to detect and display defects, including...

　　1. The main features of seamless steel pipe are welding without seam and can bear great pressure. The products can be made from rough casts or cold drawn parts. 　　2.Precision steel pipes appear just in recent years, and there are strict tolerance and roughness between the inner hole and the outer wall size. 　　Cold drawn precision steel pipe features: 1). Have a smaller diameter. 2). Can be made in small quantities due to its high precision. 3). Finished cold drawn products have high precision and good surface quality. 4). The cross section of the steel pipe is more complicated. 5). The steel pipe has superior performance and its metal is relatively dense. 　　Hot-rolled precision steel pipes are made from continuous casting round billets or roughed slabs which are heated by walking beam furnace and then put into rough mill after high-pressure water descaling; rough materials are sent into finishing mill after cutting head and tail; we adopt the implementation of computer-control...

　　The performance of square steel tube 　　1. The analysis of plasticity of square tube 　　Plasticity refers to the plastic deformation(permanent deformation) of metal material under the action of the load, which can not be damaged. 　　2. The analysis of hardness of square tube 　　Hardness is a measure of softness and hardness of metal materials. The most commonly used hardness measurement in the production is the press method, which uses indenters with a certain geometric shape to press the surface of tested metal materials and obtains its hardness based on the pressing degree. The commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC), Vickers hardness (HV) and so on. 　　3. The analysis of fatigue of square tube 　　The strength, plasticity, and hardness which we discussed above are the mechanical properties of the metal under static load. In fact, many machine parts are working under cyclic loading, which will lead to fatigue. 　　4. The analysis of i...

　　 Welded steel pipe for low pressure fluid (GB/T3092-1993), also known as general welded pipe, commonly known as the clarined,which used for conveying water, gas, air, oil and steam heating and other general low pressure fluid. steel pipe can be divided into ordinary steel pipe and thicken steel pipe according to the wall thickness. Specifications of steel pipe with nominal diameter (mm) that the nominal diameter is the diameter of the approximation. Customarily used in inches. Welded steel pipe for low pressure fluid directly is used for conveying fluids, but also a lot for low-pressure fluid the original tube of galvanized steel pipes. 　　Galvanized welded steel pipe for low pressure fluid (GB/T3091-1993), also known as galvanized welded steel pipe, commonly known as white tube, which is used for conveying water, gas, air, oil and steam heating, warm water and other fluids, or other general purpose low-pressure hot-dip galvanized welding (soldering or welding furnace) steel pipe. ...