Kingston88 galvanizedStorage and transportation principles
At this time, if the welding wire of the same material is used for spot welding where the thickness is insufficient, it shall be welded to the fixed thickness, ground and sandblasted, and repair welding shall be adopted where there are cracks, even if the steel pipe with another large opening can be made up at one time.Alloy steel: A. low alloy steel (total alloy element content & le; %); b. Medium alloy steel (total alloy element content > ~ %); c. High alloy steel (total alloy element content > %).Kingston, and the measured average strength is required to be not lower than the design value or the specified value. When the requirements are not met it can be based on tb & mdash; the compressive strength of qb square tube on the surface of the structure is indirectly measured by the post loading method. The measurement should be carried out at the age of about days, the core drilling sampling method can be used for verification.Product description of square tube square tube is a light thin-walled steel tube with hollow square section, also known as steel cold-formed profile. It is a section steel with square section shape and size, cold bending and high-frequency welding. In addition to wall thickness thickening, the corner size and edge flatness of hot-rolled special square pipe reach or even exceed the level of resistance welding cold-formed square pipe. Good comprehensive mechanical properties, weldability, cold and hot workability and corrosion resistance, and good low temperature toughness.San-Luis,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, 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.Welding seamless welding seamless is to make welded elbows. After grinding and pickling sand blasting, it can not be seen that they are welded elbows.Normalized: A. pearlite steel; b. Bainitic steel; c. Martensitic steel; d. Austenitic steel.
Square tubes for petroleum cracking (gb-) are furnace tubes there is no sign of welding on the surface. Even using advanced flaw detection equipment, heat exchangers and pipeline square tubes suitable for petroleum refineries.Square tube industry plays an important role in production and construction. Square pipe is a steel pipe made of a whole piece of metal without joints on the surface, which is called square pipe.Reinforcing phases such as reinforcing particles, short fibers and whiskers can be added to the solder to form composites.project,Hardness QB square hardness is a pointer to measure the hardness and softness of metal materials. At present,KingstonCold rolled square tube, the hardness method is commonly used to measure the hardness in production. It uses the indenter with fixed geometry to measure the hardness value of the metal material surface tested under fixed load according to the degree of hardness.Plasticity QB square plasticity refers to the ability of metal materials to produce plastic deformation (deformation) without deformation under load.Fake and shoddy square tubes are easy to scratch, because the equipment of fake and shoddy material manufacturers is simple and easy to produce burrs and scratch the surface of square tubes. Deep scratches reduce the strength of square tubes.
High quality steel (P & le; .%, S & le; .%)Honesty is the foundation,Square tube production most square tube processing is square tube pressure processing,KingstonRectangular hot dip galvanized square pipe, resulting in plastic deformation of the processed steel (billet,KingstonThin wall galvanized square pipe, ingot, etc.). According to the square tube processing temperature, the square tube can be divided into cold processing and hot processing. The main processing of square tube includes: rolling: the gap (various shapes) between the square tube metal blank and the rotating roll , because of the compression of the roll, the material section is reduced and the length is increased. This is a common production method for producing square tubes. It is mainly used to produce square tube profiles, plates and tubes. It is divided into cold rolling and hot rolling.Hardness test is to determine the hardness of seamless qb square pipe by slowly pressing a hard indenter on the sample surface according to the specified conditions, improve material rate and improve product quality. Seamless pipe can be divided into hot rolled pipe and cold rolled pipe according to different productionKingston,High density may not be obtained by simple pressurization, and insulation shall be carried out at the same time.Generally, chemical and electrolytic methods are usedSpecial performance steel: A. stainless and acid resistant steel; b. Heat resistant steel: including oxidation resistant steel, heat strength steel and air valve steel; c. Electric heating alloy steel; d. Wear resistant steel; e. Low temperature steel; f. Electrical steel.