1. Impact toughness of large-diameter steel pipe: The load acting on the machine part at a high speed is called impact load, and the ability of the metal to resist damage under the action of impact load is called impact toughness.
2. Strength of large-diameter steel pipe: Strength refers to the performance of metal materials to resist 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, flexural strength, and shear strength. There is often a corresponding relationship between various strengths, and tensile strength is generally used as a more basic strength indicator in use.
3. Large-diameter steel pipes are divided into seamless and welded seams: large-diameter steel pipes are formed by extruding seamless round pipes.
4. Plasticity of large-diameter steel pipes: Plasticity refers to the ability of metal materials to produce plastic deformation (long-term deformation) without damage under load.
5. Fatigue of large-diameter steel pipes: The strength, plasticity, and hardness discussed above are all indicators of the mechanical properties of metals under static loads. Many machine parts work under cyclic loads, under which the parts will fatigue.
6. Hardness of large-diameter steel pipes: Hardness is a pointer to measure the softness and hardness of metal materials. At present, the commonly used method for measuring hardness in production is the indentation hardness method, which uses an indenter with a corresponding geometric shape to press into the surface of the metal material to be tested under a corresponding load, and determines its hardness value according to the degree of indentation.