The purpose of Q345B square tube

Q345B square tube is a hollow square cross-section light thin-walled steel tube, also known as steel refrigerated bent section. It is based on Q345B hot-rolled or cold-rolled steel strip or coil as the base material, which is formed by cold bending and then subjected to high frequency Welded steel with square cross-sectional shape and size. In addition to the thickening of the wall thickness of the hot-rolled extra-thick wall square pipe, its corner size and edge flatness have reached or even exceeded the level of resistance welded cold formed square pipe. Q345B square pipe use Q345B square pipe is generally used in construction and machinery Manufacturing, steel construction projects, shipbuilding, solar power support, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc. Q345B square tube seamless and welded seam Q345B seamless square tube is formed by extruding Q345B seamless round tube. Q345B square tube plasticity refers to the ability of metal materials to produce plastic deformation (permanent deformation) without being damaged under load. Q345B square tube hardness is a measure of the hardness of metal materials. At present, the commonly used method for measuring hardness in production is the indentation hardness method, which uses an indenter of a certain geometric shape to press into the surface of the metal material to be tested under a certain load, and the hardness value is determined according to the degree of indentation. Commonly used methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV). The strength, plasticity, and hardness discussed above for Q345B square tube fatigue are all indicators of the mechanical properties of metals under static load. In fact, many machine parts work under cyclic loads, and under this condition the parts will fatigue. The impact toughness of Q345B square tube is the load that acts on the machine parts at a very large speed is called impact load, and the ability of metal to resist damage under impact load is called impact toughness. Q345B square tube strength refers to the resistance of metal materials to damage (excessive plastic deformation or fracture) under static load. Since the load acts in the form of tension, compression, bending, shearing, etc., the strength is also divided into tensile strength, compressive strength, bending strength, and shear strength. There is often a certain relationship between various strengths, and tensile strength is generally used as the basic strength indicator in use.