Q345B square tube is available from stock. Q345B square tube specifications are guaranteed with quality and favorable price.

Square tube description Square tube is a hollow square cross-section lightweight thin-walled steel tube, also known as steel cold-bent profile. It is a square-section steel with a square cross-section shape and size made from hot-rolled or cold-rolled strip or coil plate as the base material, which is formed by cold bending and then high-frequency welding. In addition to the thickening of the wall thickness, the corner dimensions and edge straightness of hot-rolled extra-thick-walled square tubes reach or even exceed those of resistance-welded cold-formed square tubes
Applications of square tubes
Square tubes are generally Used in construction, machinery manufacturing, steel construction projects, shipbuilding, solar power generation brackets, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc.
The difference between seamless and welded square tubes
Seamless square tubes are made by extruding seamless round tubes.
Plasticity of square tube
Plasticity refers to the ability of a metal material to produce plastic deformation (permanent deformation) without destruction under the action of load.
Square tube hardness
Hardness is a measure of the softness and hardness of metal materials. At present, the most 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 being tested under a certain load, and the hardness value is measured based on the degree of indentation. Commonly used methods include Brinell hardness, Rockwell hardness and Vickers hardness.
Square tube fatigue
The strength, plasticity and hardness discussed previously are indicators of the mechanical properties of metal under static load. In fact, many machine parts are operated under cyclic loading, and fatigue will occur in the parts under such conditions.
Impact toughness of square tube
The load acting on the machine part at a very high speed is called impact load, and the ability of the metal to resist damage under the impact load is called impact toughness.
Strength of square tube
Strength refers to the performance of metal materials against damage (excessive plastic deformation or fracture) under static load. Because the load acts in the form of tension, compression, bending, shear, etc., strength is also divided into tensile strength, compressive strength, bending strength, shear strength, etc. There is often a certain relationship between various strengths. In use, tensile strength is generally used as the most basic strength indicator.