High Grade Spiral Steel Pipe Widely Used In Water Pipelines

Spiral steel pipe commonly used standards are generally divided into (the standard, also known as ordinary fluid piping with spiral submerged arc welded steel pipe), (GB, also known as oil and gas industry to deliver steel pipe delivery technical conditions Part I: A grade steel pipe (demanding Of the A-class steel pipe)), API-5L (American Petroleum Institute, also known as pipeline steel pipe; which is divided into PSL1 and PSL2 two levels), (pile with spiral submerged arc welded pipe). The specific requirements and reference prices of the pipe and the reference price of the municipal drainage spiral pipe are as follows: Due to the technical requirements of the hot-rolled coil material and the high technological requirements of the production technology, After the production of domestic standards to cut into a single steel pipe, each batch of steel pipe must be strictly seized the first inspection system, chemical composition, melting conditions, steel pipe surface quality and after nondestructive testing to ensure that the pipe process qualified to formal Put into production. All through X-ray TV or film inspection. Each steel pipe through the hydrostatic test, the pressure using radial seal. The test pressure and time are strictly controlled by the steel pipe hydraulic microcomputer detection device. Test parameters are automatically printed. Tube end machining, so that the vertical face, bevel angle and blunt edge to be accurately controlled. Spiral steel pipe because of the relatively cheap, is currently widely used in water pipes or some of the smaller pressure on the oil and gas industry.

For the composition of steel pipe sales price, material prices are dominant and even decisive factors. Carefully examine the spiral welded pipe and straight seam welded pipe price difference, spiral welded pipe price slightly higher than the straight seam welded pipe is due to the price difference between the production of the main material. However, steel pipe production is only part of the project, if taking into account the overall quality of the project, the project cost and other factors, spiral welded pipe still has the overall advantage. Double-sided submerged arc welded straight seam steel pipe is a new welding method invented in 1940. It is the same place as the previous manual welding it is still using slag protection, but this slag is not the electrode of the electrode, is specially melted Of the flux. The flux system is transported by a pipe through a pipe to the front of the weld. The second difference is not using the electrode, the use of welding wire, because the wire can be continuously given to the electrode, we burn a welding electrode must have a welding head to throw, and operation to stop, change the electrode and then welding. Into the welding wire, with the welding device and the welding wire, continuous feeding to the welding wire, this welding method is continuous feeding of the wire, in the melting of the granular flux cover the arc, so that welding wire, And a part of the flux melting and evaporation constitute a cavity, the arc is stable combustion inside the cavity, so it is called submerged arc welding. The arc is buried inside the cavity. This method, the first advantage is fully realized automation; the second advantage, it is under the submerged arc welding, so its heat exchange and protection performance is relatively strong, welding quality is relatively high; the third advantage , Because the submerged arc welding in the arc buried under the welding, so it can use high current, welding efficiency is relatively high, recently our country is ongoing West-East Pipeline project, the pipeline is a high-strength steel, this pipe in the The factory inside the first pre-made a section, and then get the site, in the field of welding, this pipe in the factory production of welding technology is the use of submerged arc welding, submerged arc welding has now developed into a double wire submerged arc welding, There are multi-wire submerged arc welding, the efficiency is further improved.

Spiral pipe in the municipal drainage, transportation has played a significant role. With a number of major pipeline projects at home and abroad planning and construction, large deformation pipeline steel, high-strength grade hot simmer elbow and thick specifications of low temperature fittings and other high value-added products, showing a good market competitiveness and greater market demand , And domestic enterprises in the development of the series of products is relatively slow progress, should be developed as soon as possible for industrial applications of high value-added large deformation pipeline steel, hot simmer bent steel, pipe station with low temperature pipe steel, X100 straight seam Submerged arc welded pipe, spiral submerged arc welded pipe and hot simmer spiral welded pipe. Walking with Q235B spiral steel pipe with electric contact pressure gauge to control the pressure on both sides of the conveyor belt to ensure the smooth delivery of the strip. Using external control or internal control roll forming. The use of weld gap control device to ensure that the weld gap to meet the welding requirements, diameter, misalignment and weld gap are strictly controlled. Welding and external welding are used in the United States Lincoln welding machine for single or double wire submerged arc welding, in order to obtain a stable welding specifications. Welded welds have been on-line continuous ultrasonic automatic injury inspection to ensure that 100% of the spiral weld nondestructive testing coverage. If there is a defect, automatic alarm and spray marking, production workers at any time to adjust the process parameters, the timely elimination of defects. The government has repeatedly stressed the importance of production capacity, the local also a positive response to the late to the production capacity of the expected reduction in supply has also become the main driving force to promote steel prices. 2017 steel to production capacity, environmental issues such as the continuous deepening of steel production capacity in the reduction phase, and for the silicon-manganese alloy is also a serious survival test.