SSAW Pipe

　　High-precision seamless steel tubes generally improve the properties of the materials by adding alloys to the metal. After cold drawing, the seamless steel tubes need to be subjected to stress relief annealing to eliminate residual stress of the materials, improve the structure of the materials, and improve the material. Plasticity, so as to prevent the occurrence of fracture failure of seamless steel pipe. 　　At present, the material of the stainless steel seamless steel pipe is ordinary 45# or 20# steel 27SiMn steel, and the strength of the metal is improved by cold drawing deformation; however, it is at the expense of the plasticity and toughness of the sacrificial metal. High-precision cold-drawn seamless steel pipe is based on its high dimensional accuracy and high strength performance. It must ensure that the deformation amount is within a certain range to maximize the performance of the material and reduce the material negative effects. 　　The deformation of the seamless ste...

　　Here are a few ways to measure the diameter of steel pipe: 　　1. Direct Diameter measurement is the easiest. Measure at the end of the pipe. 　　2. Direct Diameter measurement with a caliper (useful if the end is not accessible) 　　3. Measure circumference using a flexible tape and divide the outside circumference by 3.1415. Here the circumference is about 1/32″ (0.03″) less than 6″ = 5.97″. So 5.97 ÷ 3.1415 = 1.900″ diameter – 1 1/2″ nominal pipe. 　　Many people like using pi tapes to measure the pipe size. Pi tapes, which wrap around the pipe the same way but have units in diameter, can be expensive. With calculators everywhere today, dividing by 3.14 is a snap, making these pi tapes not even necessary. In fact, even using an inexpensive sewing tape works fine! 　　Round hollow sections can be a true round tube where 2″ is really 2.00″ outside diameter. This is called “2 inch O.D. tubing”. And if you are really lucky enough, the tubing is already marked and you don’t need to eve...

　　The basic method of rust removal for boiler tube: 　 　1. Cleaning 　　Using the solvent and emulsion to clean the surface of high pressure boiler pipe, so as to achieve the purpose of removing oil, grease, dust, lubricant and similar organic matter. But it cannot remove the dust, oxide skin, welding medicine and so on. So it is only as a supplementary method in the anti-corrosion production. 　　2. Tool 　　Tool rust removal mainly use wire brush and other tools to grind the surface of high pressure boiler pipe. It can remove loose or warping of the oxide skin, rust, welding slag and so on. Manual tool can reach SA2 level, power tool can reach SA3 level. If the iron oxide scale attached to the surface, it cannot reach the anchorage depth required by the anti-corrosion construction. 　　 3. Acid cleaning 　　High pressure boiler pipe generally adopt chemical and electrolytic methods to do pickling treatment. 　 　4. Spray rust removal 　　Spray rust removal cannot only remove rust, o...

　　Precision pipe is the carbon, alloy or stainless steel pipe with high precision sizes. Usually it has been made through hot rolling or cold drawn (cold rolling) processes. So precision pipe is a kind of seamless pipe . 　　Precision steel pipe material standard 　　International standard for precision pipe is DIN 2391, which is applied with European standard. 　　As a matter of fact, more steel pipe standard could applied for the precision pipe. Includes DIN2445, EN10305, DIN1630, DIN1629, ASTM A106, ASTM A179, JIS G3445 　　Materials available with 10#, 20#, 35, 45, 40Cr, 25Mn. 37Mn5, St35(E235), St37.4, St45(E255), St52(E355) and etc. 　 　Size Tolerances 　　For hot rolling precision steel pipe, tolerance of OD is +/- 0.1%. 　　For cold drawn precision pipe, tolerance allowed in below conditions: 　　Diameters 6mm to 10mm, normal tolerance condition +/- 0.2%, premium tolerance condition +/- 0.15%. 　　10mm to 30mm, normal tolerance condition +/- 0.4%, premium tolerance condition +...

　　API mild steel pipe is widely used in lots of industries. However, a lot of customers still don't know kinds of API steel pipe and their usage. Here we are instroduce you the detail of API steel pipe. 　　 API line steel pipe 　　API line steel pipe is the line pipe that meets the American Petroleum standard. Line pipe is used for transportation of oil, gas and water to the oil and gas industry enterprises. Ends of pipe include plain end, threaded end and socket end; their connections concludes end welding, coupling, socket connections. With the development of technology, API line steel pipe's range of applications is expanding gradually, especially in the large-diameter disaster. Coupled with the factor of cost, welded pipe have a dominant position in the field of line pipe, limiting development of stainless steel seamless line pipe. During 2004, production of seamless line pipe is about 400,000 t, ranging from X42 to X70. API line steel pipe is divided into onshore line st...

　　SSAW steel pipe itself has no life limit, and the service life is mainly related to the operating environment and production process. Spiral steel pipe operating environment is relatively poor In order to extend the service life, the outer wall and inner diameter of the steel pipe are preserved. 　　Anti-corrosion steel pipe refers to a steel pipe that has been treated by anti-corrosion technology and can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reaction during transportation and use. The anti-corrosion steel pipe can effectively prevent or slow down the corrosion and prolong the service life of the steel pipe and reduce the running cost of the steel pipe. 　　There are many steel pipeline anti-corrosion coatings in China, such as petroleum asphalt, PE jacket and PE foam jacket, epoxy coal tar pitch, coal tar enamel, epoxy powder and three-layer composite structure, and epoxy coal tar pitch cold-wrapped belt (PF type). , rubber-p...

　　The ultrasonic probe can be realized electricity harmonies which can the mutual conversion of the Q and ultrasonic wave propagation in elastic media, the physical characteristic is the basis of the seamless steel pipe principle of the ultrasonic flaw detection. 　　Directional transmission of the ultrasonic beam propagation in Seamless encounter defects, and produces both a reflection of the wave generated wave attenuation. After the flaw detector of the signal processing, such as obtained using a reflection method flaw defect echo signals, such as penetration method flaw virtue through the degree of attenuation of the wave guide to the defect signal. Both can be a quantitative defect indication is given by the instrument. The use of the piezoelectric effect or the electromagnetic induction principle different types of ultrasonic wave can be excited within the tube. Therefore, the piezoelectric ultrasonic and electromagnetic ultrasound can be used to pipe ultrasonic inspection. But ...

　　API 5L steel line pipe adopts different steel grades, generally are Gr.B, X42, X46, X52, X60, X70, X80. Some manufacturers are capable of manufacturing steel grade up to X100 and X120. As the steel line pipe grades higher, more strictly control on the carbon equivalent control, and higher mechanical strength performances. 　　More over, for the same grade API 5L pipe , seamless and welded chemical elements content is different, which welded pipe is required more strictly and lower on Carbon and Sulfur. 　　By different delivery condition, there are also As-rolled, normalizing rolled, thermomechanical rolled, normalizing formed, normalized, normalized and tempered, quenched and tempered. 　　For intermediate grades, API 5L pipe grade shall be in one of following description format: 　　1. The letter L followed by the specified minimum yield strength in Mpa. For example, L290 (X42) means the minimum yield strength is 290 Mpa. In case of PSL2 pipe, Suffix letter (R, N, Q or M) shall be ...

　　Heat treatment is a method of changing the physical properties of high pressure boiler pipe by heating and cooling. Heat treatment can improve the microstructure of high pressure boiler pipe, so as to meet the required physical requirements. Toughness, hardness and wear resistance are obtained by heat treatment. In order to obtain these characteristics, it is necessary to adopt quenching, annealing, tempering and surface hardening. 　 　a. Quenching 　　Hardening, also called quenching, is that high pressure boiler pipe is heated evenly to the appropriate temperature, then quickly immerse in water or oil for rapid cooling, and cooling in the air or in the freezing zone. So that the high pressure boiler pipe can obtain the required hardness. 　 　b. Tempering 　　High pressure boiler pipe will become brittle after hardening. And the stress caused by quenching can make the high pressure boiler pipe tapped and broken. The tempering method can be used to eliminate brittleness. Although ...

　　With the booming of steel pipe’s market, no matter seamless steel pipe , or welded tube, manufacturers are making advanced technology in production process. Today, we will share a kind of hot extruded steel tube with its special benefits by using it. 　　Hot extruded seamless steel pipe, made by hot extrusion method, would have good metal density. Thus, it is widely used among steel productions with high quality. It is good helper for industries of military, nuclear power, thermal power, aviation, mining, oil and other areas which need high pressure steel tubes. 　　Talking about production process for customers, suppliers would guarantee the high precision, a complete production line, a broad product line includes: pre-treatment tube offline, online pre-heating and heating tube, inner tube, the outer surface of the glass powder lubrication after heat perforation / reaming, after reheating and the inner and outer surfaces of the glass powder lubricant into the hot extrusion process. ...