The technology of floating mandrel and square tube is gradually mature.Generally, chemical and electrolytic methods are usedSanta Cruz de yoa,When cutting the sample, the surface of the sample shall not be damaged, the properties of the metal shall not be changed due to heating or cold processing, and the edges at the section shall be rounded.Normalized: A. pearlite steel; b. Bainitic steel; c. Martensitic steel; d. Austenitic steel.Fontem,If there is only a single plane weld the step-by-step back welding shall be adopted from the middle, that is, the arc of the section weld shall be terminated at the section arc.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.Hot dip galvanized square tube is a kind of square tube which is welded after using steel plate or steel strip to curl and form, and on the basis of this square tube, the square tube is placed in the hot dip galvanized pool and formed through a series of chemical reactions; The production process of hot-dip galvanized square pipe is relatively simple, but the production efficiency is very high and there are many specifications and varieties, but this kind of square pipe needs little equipment and capital, which is more suitable for the production of small galvanized square pipe manufacturers.

Square pipe for diamond core drilling (gb-) is a square pipe for drill pipe, core rod and casing for diamond core drilling.Brinell hardness, Rockwell hardness and Vickers hardness are commonly used.If the re inspection results are unqualified (including the items whose preliminary inspection results are unqualified and re inspection is not allowed),Santa Cruz de yoaGalvanized square pipe welding, and propose acceptance with a new batch.Quality department,Stage ( & mdash; )Square tube is made of different materials. It needs qualified inspection by relevant staff before leaving the factory. Square tube has a wide range of uses. Its main field is not only the construction industry, but also can be seen everywhere in our daily life. The service life of square tubes is mainly affected by surface treatment. I will explain the specific operations of surface treatment of square tubes.The surface of galvanized square pipe treated by sand blasting, shot blasting or pickling process is relatively clean, and the oxide scale and rust are removed, manual and mechanical derusting can be adopted but the derusting quality level must be reached.

Put the pig iron for steelmaking into the steelmaking furnace according to the specified process to obtain steel. The products of steel include ingots, continuous casting billets and various steel castings made of straight square tubes. Generally speaking, steel refers to the steel rolled into various square tubes. Square tube steel belongs to ferrous metal, but steel is not completely equal to ferrous metal.Quality Assurance,Because the green billet can be pressed into any shape, it is easy to weld the square tube into difficult products.It must be noted that in the overall process of square tube coating process, the cost of surface treatment is still relatively high,Santa Cruz de yoa50 galvanized square pipe size, so it is very important to select appropriate treatment. Only by selecting the right treatment can the coating quality of square pipe be well guaranteed.According to smelting classification and furnace type,Santa Cruz de yoa30 price of galvanized square pipe, A. open hearth steel: (a) acid open hearth steel; (b) Alkaline open hearth steel.Santa Cruz de yoa,According to metallographic classification, the annealed state of square tube: A. hypoeutectoid steel (ferrite + pearlite); b. Eutectoid steel (pearlite); c. Steel precipitation through a common square tube (pearlite + cementite); d. Ledeburite steel (pearlite + cementite).Principle of cold drawing strengthening: the lattice defects of steel increase during plastic deformation, 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