Seamless Steel Pipe

　　There are many uses of steel in our daily lives, such as household products (pots, scissors, cans), agricultural equipment and construction. This material is widely used in industry in general, especially in the form of steel sheets and tubes. In the energy sector, steel is widely used in hydroelectric and thermoelectric plants, forming pipes to conduct energy. There are several types of tube, each with its own specifics. Meet the following categories: 　　 Square Tubes 　　 Square tubes can be applied in a variety of industrial sectors, such as the foundation industry, general machine industry and other applications that require greater mechanical strength. Square tubes adapt well to these uses because they have a high concentration of carbon in their composition. They may be black or galvanized, whether or not sewn. 　 　Rectangular Tubes 　　They are widely used in the production of machines and equipment of high strength and durability. Its geometric shape allows its use in mezz...

　　There are generally five categories of square tube performance: 　　 Plasticity 　　Plasticity refers to the ability of a metal material to undergo plastic deformation (permanent deformation) without damage under load. 　　 Hardness 　　Hardness is a measure of the hardness of a metal material. At present, the most commonly used method for measuring hardness in production is the indentation hardness method, which presses the surface of the metal material to be tested under a certain load with a certain geometry of the indenter, and determines the hardness value according to the degree of being pressed. Commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV). 　 　Impact toughness 　　The load acting on the machine at a large speed is called the impact load, and the ability of the metal to resist damage under the impact load is called impact toughness. 　　 Fatigue 　　The strength, plasticity, and hardness discussed above are all i...

　　Forming method of circular tube is called bending, and the forming method of the rectangular tube is called buckling. There are two basic ways to bend forming: solid bending and empty bending. 　　1, Real bend 　　Real bend, as the name suggests is the compaction of the bend, the actual time when the inner and outer roller and tube billet two-way compaction. 　　1) The advantage of solid bending is small rebound, forming accurate, and as long as the roller type is accurate, the angle of the inner corner of the R is more accurate. 　　2) The disadvantage of real bending is the stretching / ironing effect. First, the actual bend will make the bend at the tensile, stretch effect so that the longitudinal length of the bend line shortened; Second, the real bend bending metal thinning due to stretching. 　　2, Empty bend 　　Blank bending through the outer roller and the outer wall of the tube to form a one-way contact bending moment to strip material bending, empty bend will make the bend...