Spiral tubes are mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, rural construction, sales network covering more than 20 provinces and cities, and one of the 20 key products developed by the country. For liquid transportation: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural use: for piling pipes, for bridges; for piers, roads, building structures, etc. Spiral steel pipe production process spiral steel pipe is a spiral seam steel pipe which is made of steel coiled coil as raw material, which is often heated and extruded, and is welded by automatic double wire double-sided submerged arc welding process.
The descaling speed of the steel pipe depends on the type of abrasive and the displacement of the abrasive, that is, the total kinetic energy E of the abrasive applied to the steel pipe per unit time and the kinetic energy E1 of the single-grain abrasive. In the production, the importance of surface treatment is emphasized, and the process parameters during rust removal are strictly controlled. In actual construction, the peel strength of the steel pipe anti-corrosion layer greatly exceeds the standard requirements, ensuring the quality of the anti-corrosion layer, based on the same equipment. , greatly improve the process level and reduce production costs.
Where: m--abrasive spray (throwing) amount; V--abrasive running speed; m1--single-grain abrasive quality. The size of m is related to the rate of abrasive breakage. The size of the fracture rate directly affects the cost of surface treatment operations and the cost of descaling equipment. When the equipment is fixed, m is a constant, y is a constant, so E is also a constant, but since the abrasive breaks, m1 changes. Therefore, generally, the abrasive with lower loss rate should be selected, which is beneficial to improve the cleaning speed and length. The life of the blade.
Spiral tube cleaning and preheating Before the spraying (polishing) treatment, the grease and scale on the surface of the steel tube are removed by washing, and the tube body is preheated to 40-60 ° C by a heating furnace to keep the surface of the steel tube dry. In the spraying (throwing) treatment, since the surface of the steel pipe does not contain dirt such as grease, the effect of rust removal can be enhanced, and the surface of the dried steel pipe is also advantageous for the separation of the steel shot, the steel sand, the rust and the scale, and the rust removal. The surface of the steel pipe is cleaner.
The spiral pipe is passed through the steel pipe blank sawing section, and then in the ring furnace heating - perforation - sizing - straightening - cooling - drama - packaged into a qualified finished product, generally in the production workshop sent to the user is not able to put it down More in stock, this requires dealers to put some stock, but dealers generally do not have large indoor libraries, and some are too costly and uneconomical. Most of them are outdoor warehouses, and the spiral tubes are placed outdoors to avoid the sun.
The so-called floating rust, as the name suggests, is a layer of rust floating above the spiral tube. It can be removed with a towel or other things. Simply speaking, the floating rust is also rust-free and belongs to the normal state. The rust of the spiral tube is a spiral tube that has been used for a long time at least for more than one year, and the rusted spiral tube has large and small puddles. This is also the only rust and rust of the spiral tube. The biggest difference.
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