Square pipe is the name of square pipe, that is, steel pipe with equal side length. It is made of rolled strip steel after process treatment.Compared with other welding, square pipe welding has many advantages, mainly because of the exothermic reaction, the material only needs to be heated below the melting pointEl Salvador,The great difference between the square pipe and the thin-walled steel pipe produced by the square pipe factory lies in the thickness of the steel pipe wall. Generally speaking, the thin-walled steel pipe is cold drawn technology, while the square pipe generally uses hot rolling technology. If it is distinguished by the unit of measurement, and the thin-walled steel pipe is that the wall thickness diameter is less than ., Larger than is the square pipe. In terms of use, thin-walled steel pipes are mostly used in pipes. The square tube is mostly used in the blank of hollow parts. Used on pressure bearing and important pipelines.In this period, the technology of continuous rolling pipe was not mature.Makati,With the progress of the times and the faster and faster economic development, the places where large-diameter seamless square tubes are used are becoming more and more popularSquare tubes for low and medium pressure boilers (gb-) are high-quality carbon structural steel hot-rolled and cold drawn (rolled) square tubes for superheated steam tubes, boiling water tubes for low and medium pressure boilers of various structures and superheated steam tubes, large smoke tubes, small smoke tubes and arch brick tubes for locomotive boilers. Square tubes for high-pressure boilers (gb- is a high-quality carbon steel,El SalvadorGalvanized thin-walled rectangular tube, alloy steel and stainless heat-resistant steel square tube for the heating surface of water tube boilers with high pressure and above. High pressure square tube for chemical fertilizer equipment (GB - is a high-quality carbon structural steel and alloy steel square tube suitable for chemical equipment and pipelines with working temperature of - ~ ℃ and working pressure of ~ mA.B. tool steel: (a) carbon tool steel; (b) Alloy tool steel; (c) High speed tool steel.

Stage ( & mdash; )The purpose of heat is to prevent the generation of cold cracks. Cold crack is directly related to carbon equivalent. Therefore,El Salvador65 hot dip galvanized pipe, it is necessary to distinguish the carbon equivalent of the qb square tube and the carbon equivalent of the qb square tube is the same. If the carbon equivalent of Q is less than .%, it can be said that the weldability is OK. Generally speaking, the cold crack increases when the carbon equivalent is .%.Compared with other welding, square pipe welding has many advantages, mainly because of the exothermic reaction, the material only needs to be heated below the melting pointPrice, and the serious distortion of defect lattice will hinder the progress and slip of lattice so the yield point of steel increases and the plasticity and toughness decrease. Due to the internal stress in plastic deformation, the modulus of steel decreases. The cold drawn reinforcement is stored at room temperature for ~ d or heated to ~ ℃ and maintained for a fixed time. This process is called aging treatment.C. special performance steel: (a) stainless and acid resistant steel; (b) Heat resistant steel; (c) Electric heating alloy steel; (d) Electrical steel; (e) High manganese wear resistant steel.

Welding seamless welding seamless is to make welded elbows. After grinding and pickling, sand blasting, there is no sign of welding on the surface. Even using advanced flaw detection equipment, it can not be seen that they are welded elbows.Installation material list,Main uses of square tube: square tube is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry agricultural irrigation and urban construction. It is one of the key products developed.The inclusions in the square tube treated with calcium can be denatured well, and the morphology of sulfide in the rolled stock is also improved.The inspection items, sampling quantity, sampling position and test of square tube shall be in accordance with the provisions of corresponding product standards. With the consent of the demander,El SalvadorWelding technology of galvanized square pipe, hot-rolled square tubes can be sampled in batches according to the rolled root array.El Salvador,Ship carbon steel square pipe (gb-) is a carbon steel square pipe for ship class I pressure pipe system, class II pressure pipe system, boiler and superheater. It is a long-term business square pipe, square pipe, seamless square pipe, galvanized square pipe and galvanized pipe. Welcome to consult. The working temperature of carbon steel square pipe wall shall not exceed ℃, and the working temperature of alloy steel square pipe wall shall exceed ℃.Cleaning solvent and emulsion can clean the surface of square tube to remove oil, grease, agent and similar organic matter, but it can not remove rust, scale, welding, etc. on the surface of square tube, so it is only used as an auxiliary means in production.Stage ( & mdash; )