What is the difference between 20# steel pipe and Q345B steel pipe?
The main difference between 20# steel pipe and Q345B steel pipe is their chemical composition, mechanical properties and application scenarios:
Chemical composition and strength:
20# steel pipe: belongs to high-quality carbon structural steel, the carbon content is about 0.20%. It has lower strength and hardness, but better plasticity and toughness, and excellent welding performance.
Q345B steel pipe: belongs to low alloy high-strength structural steel, the yield strength is 345MPa. it has good comprehensive mechanical properties, especially in the low-temperature environment can still maintain good performance. q345B is usually used in structural engineering that requires higher strength and good weldability.
Mechanical properties:
20# steel pipe: suitable for application scenarios that require good ductility and weldability, such as fabricated parts and carburised and nitrided components.
Q345B steel pipe: due to its high strength and good plastic toughness, it is commonly used to make structures subject to dynamic loads such as bridges, main beams of houses, cranes, etc. It can also be used for a variety of structures in cold regions below -40°C.
Application Scenario:
20# steel pipe: commonly used to make pressure processing parts, welded parts, etc., suitable for general mechanical parts and building structures.
Q345B steel pipe: mainly used in engineering structure, such as factory roof beams, bridges, bridges and tower body of tower cranes.
