steel tube

    There are four stages of tensile test for small diameter seamless steel tubes     (1) Elastic phase: the deformation of this stage of the sample is completely elastic, all write the load, the sample will restore its original length. The elastic modulus of the material can be determined in this stage.     (2) Yield stage: the elongation of the specimen increases abruptly, while the load reading on the universal testing machine fluctuates in a very small range (jagged lines in the figure). If the slight fluctuation of this load reading is omitted, this stage can be represented by a horizontal line segment on the drawing. If the sample is polished, the surface of the specimen will see a stripe about 45 ° in the direction of the axis, called the slip line.     (3) Strengthening stage: the sample after the yield phase, to make it continue to stretch, because the material in the plastic deformation process continues to strengthen, so the resis...

    Cracks of smls pipe are:     First, the tube (round steel) for many reasons, the internal contains more cracks, inclusions, air bags and so on. Organization of the uneven is the reasons for the tube, pay attention to the choice of the implementation of the tube blank standard, a certain size of the manufacturers of round bar on the line.     Second, the perforation of the temperature, process adjustment can not be ignored, if the perforation temperature is low, improper adjustment, will also cause the organization within the capillary tear.     Third, the finished annealing temperature is appropriate. Perforation heating temperature 1180 ~ 1230 ℃, low, which is the temperature of carbon steel, take 1230-1250 was appropriate. Furnace time is generally more than 60min.

    The main factors that affect the quality of seamless steel tube machining are machine tools, knives, fixtures, workpiece blanks, process methods and processing environment. To improve the quality of  seamless steel tube 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 Use of machine tool fixture to ensure the accuracy of processing, such...

    Use of dsaw pipe in following cases:     (1) For the high peak regulation of the pipeline, due to the user's gas consumption is very uneven, frequent fluctuations in pipeline pressure, steel pipe to withstand the large alternating stress, pipe defects have been extended under the alternating stress, if selection of welds, high probability of defects in the spiral welded steel pipe , pipe safety operations will not be guaranteed.     (2) Pipeline crossing the seismic fault zone or through the local high-intensity seismic area, due to the frequent geological activities of these lots, the pipeline will produce longitudinal or axial alternating stress. Spiral weld, the probability of defects is higher than that of dsaw pipe. Under long term stress, the probability of occurrence of spiral welded pipe is much higher than that of dsaw pipe.     (3) Inside and outside the coating requires a high pipeline, should be used dsaw pipe. spiral pipe mo...

    In the ultrasonic inspection of dsaw pipe, how to identify and determine the echo is a key issue. The influence of ultrasonic defect signal or non-defect signal and the radius of curvature of the steel pipe on the defect location is analyzed by analyzing the characteristics of the actual ultrasonic testing of the double-sided submerged arc welded pipe weld, including the segregation, inclusions, crack and base metal delamination of the ultrasonic echo signal. This paper summarizes the causes and identification methods of four kinds of pseudo-defective waves, such as the reflected wave of the coupling agent, the reflection wave of the weld surface, the reflected wave caused by the upper and lower dislocation of the weld, and the non-defect wave formed by the weld height or the undercut The accuracy of the defective wave discriminating provides a new idea and direction for the actual ultrasonic testing of the dsaw pipe.     In the ultrasonic inspection of steel p...

    There are many ways to connect carbon steel seamless tube, 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; h, welding and welding and the traditional combination of the derivative Series of connections.     Different connections, because of their different production principles, its application areas are also different, but in general have one thing in common is the easy installation, solid and reliable.     Here are some of the more common connection to do a brief introduction:     1. Compression: the pipe into the pipe fittings, fastened by the nut, with a spiral force to the mouth of the casing through the seal ring compression, sealing effect, to complete the connection pipe.     2. Welding type: the end of the pipe processing bevel, with manual or automatic welding on the pipe...

　　China’s steel futures started the week on a positive note after experiencing losses ahead of the weekend, posting gains along with the contracts for steelmaking raw materials during morning trading on Monday November 20. 　　Futures closing prices – morning session 　　Shanghai Futures Exchange 　　May rebar: 3,685 ($556) per tonne, up 28 yuan per tonne 　　May hot-rolled coil: 3,786 yuan per tonne, up 22 yuan per tonne 　　Dalian Commodity Exchange 　　January iron ore: 470 yuan per tonne, up 7.50 yuan per tonne 　　January coking coal: 1,205 yuan per tonne, up 7 yuan per tonne 　　January coke: 1,891 yuan per tonne, up 45.50 yuan per tonne 　　Raw materials 　　Metal Bulletin’s 62% Fe Iron Ore Index rose $1.04 per tonne to $62.61 per tonne cfr China last Friday. 　　Its fob Australia premium hard coking coal index increased $2.19 per tonne to $188.56 per tonne. 　　The following were obtained from market sources: 　　Rio Tinto, tender, 170,000 tonnes of 61% Fe Pilbara Blend fines, laycan D...

    Industrial stainless steel pipe can be divided into 304L, 304, 310, 303, 302, 301, 202, 201, 410, 420, 430 standards industrial stainless steel pipe and etc. Stainless steel is a modern material with 60 years of history, it has the advantages of not easy to corrosion, pitting, corrosion or wear, and it is one of the highest strength materials in construction metal materials. The industrial stainless steel pipe is widely used for chemical industry, shipbuilding, electric power, construction, oil field, gas, sewage, mechanical equipment, aviation, submarine engineering, pharmaceutical, and etc     The most popular industrial stainless steel pipe is 302, 304L, 304, and 310 these four standards, the function of these industrial stainless steel pipe are listed as below.     302 industrial stainless steel pipe: 302 stainless steel rods are widely used in auto parts, aviation and aerospace hardware tools, chemical industry. Specific as follows: arts and cr...

    According to big date about import, the United States steel sheet related products import increased 4% from 834,000 short tons in September to 866,000 tons in October. Steel Sheets products imports for the first 3 quarters in 2017 were around 2% lower than in the first 3 quarter in 2016. However, comparing the first 3 quarters of 2017 to 2016 by product, the decline in hot rolled imports (-18%) and cut plate imports (-38%) was offset by an increase in cold rolled imports (+25%) and hot dip galvanized imports (+17%).     Imports increased between September and October mainly because of more hot rolled imports including increase from Canada. Cold rolled and cut sheet also increase between September and October but hot dipped galvanized imports decrease due to lower volumes mainly from Turkey, China and Brazil.     Although there are some anti-dumping duty about importing steel pipe products from China to USA, but there fro large diameter steel pipes, ...

    Carbon steel pipe is made with steel ingot or solid round steel and processed into a tubular billet by perforation, than finished with hot and cold rolled. So it can be divided into hot rolled steel pipe and cold rolled steel pipe two categories.     Hot rolled steel pipe can be divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking tube, geological steel pipe and others.     Cold rolled steel pipe not only included general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking tube, but also included carbon thin-walled steel pipe, alloy thin-walled steel pipe, stainless thin-walled steel pipe and profiled steel pipe.     According to the classification of use, we can divide the carbon steel pipe into below 5 types:     1.Pi...

    The mainly application of SSAW steel pipe (Spiral submerged Arc Welded Pipes) is buildings, bridges, roads and other civil engineering construction. Also widely used for natural gas, oil, chemical industry, electricity, drainage, steam heating, pressure pipe use for hydro-power station, thermal power, water and other longer distance fluid pipeline and construction domain such as piling, dredging, bridges, steel structures and etc.     There are two points of the difference between Spiral submerged Arc Welded Steel Pipe(SSAW) and Straight Seam Welded Steel Pipe(LASW)     1. In terms of weld technical, the welding method of SSAW steel pipe is same as the LASW steel pipe, but the LASW steel pipe cannot avoid T-shaped weld, so the probability of welding defects will also increase.     2. In terms of material and metallurgical properties, the LASW steel pipe is manufactured with steel plate, but the SSAW steel pipe is manufactured with hot ro...

    Seamless steel pipe is manufactured with general carbon structure steel, low-alloy structural steel or alloy structural steel. Is strictly manufactured according to the GB/T8162-87, cold rolled(cold drawn) pipe outer diameter of 5~200mm. The wall is 2.5~200mm thick. The outer diameter of hot rolled pipe is 32~630mm. Wall thickness 2.5~75mm. There are no cracks, ionosphere, rolling, folding, hairline and scar defects in the inner and outer surface of the steel pipe.     A number of pipes used for oil, gas, water and other solid material transportation. Compared with the solid steels such as steel pipe and round steel, the seamless steel pipe is lighter than the other same strength steels and it's an economical hollow cross-section steel pipe.     The seamless pipe not only can transport the fluid material, but also widely use for manufacturing the general structure and mechanical structure, such as oil drill pipe, auto sem-shaft casing, bicycle frame...

　　There are some damage in steel pipes that we cannot figure it out with our naked eyes. We have to count on various test equipment to help us at this situation, whether you choose seamless steel pipe or ERW steel pipe, it is necessary to clear about the inspection methods. 　　We can see that there are three main inspections ways according to "who" is the inspector. First of all, we can make self-inspection in factory. This would make suppliers guarantee their steel pipe's quality before they sell to customers. Of course, the third party inspection would give more trust to customers so that this is the second way to inspect the product. In addition, customer inspection by themself would give them more trust before they purchase the product too. 　　What's more, the detailed inspection methods would be list here: 　　Chemical composition 　　Mechanical property: yield strength, tensile strength, bend 　　Dimension testing 　　Visual inspection 　　Non-destructiv...

　　This International Standard specifies the technical delivery conditions for steel pipes (casing, tubing, plain-end casing liners and pup joints), coupling stock and accessories and establishes requirements for three Product Specification Levels (PSL-1, PSL-2, PSL-3). The requirements for PSL-1 are the basis of this. 　　International Standard. The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all Grades except H-40 and L-80 9Cr, are contained in Annex H. 　　For pipes covered by this International Standard, the sizes, masses and wall thicknesses as well as grades and applicable end-finishes are listed in Tables C.1 to C.3 and Tables E.1 to E.3. 　　By agreement between the purchaser and manufacturer, this International Standard can also be applied to other plain-end pipe sizes and wall thicknesses. 　　Abstract from?API 5CT’Scope. 　 　Source: www.xysteelpipe.com

　　Coated pipeline is mainly used in chemical, natural gas, oil, thermal, sewage treatment, bridge, water source, steel structure and other pipe engineering fields. 　　2PE/3PE, also know as 2LPE/3LPE, are short for 2 layer Polyethylene/3 layer Polyethylene, are widely used on various kind of steel pipes. 　　The overall quality of the anti-corrosive pipeline was improved significantly by using the electrostatic spraying epoxy powder on the surface of the steel tube and the side wound adhesives and the side winding polyethylene anti-corrosion layer. It has the properties of chemical resistance, cathodic stripping and mechanical failure. 　 　Source: www.xysteelpipe.com

　　Coated pipeline is mainly used in oil, chemical, natural gas, thermal, sewage treatment, water source, bridge, steel structure and other pipe engineering fields. 　　FBE, short for fusion bond epoxy, also known as fusion-bond epoxy powder coating, is an epoxy based powder coating that is widely used to protect steel pipe used in pipeline construction, valves etc. from corrosion. FEB apply electrostatic spraying process to apply epoxy powder on the surface of the steel tube and make a film once. 　　The coating has the advantages of simple coating operation, no pollution, anti-shock coating and anti-bending performance and high temperature resistance. 　　Source: www.xysteelpipe.com

　　Nowadays, many projects require high-altitude operation, and the role of scaffolding is particularly important. 　　Scaffolding is an essential part of the construction of temporary facilities, such as turn masonry wall plaster, concrete, metope, decorations and paint, the installation of structures, etc., all need beside the erection of scaffolding, to stand in for the construction operation above, pile construction materials and necessary level of short distance transportation. 　　Scaffolding is an safe and stable partner nearby when it comes to construction operations. But it seems that there are so many people haven’t hear about it until now. We should let more people know about it and put scaffolding worldwide. 　　 Source: www.xysteelpipe.com