Q345D seamless steel pipe

Q345D seamless steel pipe Q345D is a material of steel pipe. Q represents the yield of this material, and the 345 behind it refers to the yield value of this material, which is around 345. And the yield value decreases as the thickness of the material increases.

Q345A, Q345B, Q345C, Q345D, Q345E are the distinctions of quality grades, increasing from A to E, mainly due to the difference in impact temperature caused by the content of microelements such as phosphorus and sulfur, which means the impact temperature is different And tube chemical composition mechanical properties.

Q345D seamless steel pipe is divided into seamless steel pipe and welded steel pipe.
The production process of seamless steel pipe is to thread a solid billet or ingot into a hollow capillary tube, which is then rolled into a pipe of the required size. The different piercing and rolling methods used constitute different methods of producing seamless steel pipes.
The production process of welded steel pipe is to bend the tube blank (steel plate or strip) into a tubular shape, and then weld the gap to form a steel pipe. Due to the different forming and welding methods used, different methods of producing welded steel pipes are formed.

Seamless steel pipes are mainly produced by hot rolling. The extrusion method is mainly used to produce hard-to-pierce low-plastic high-alloy steel pipes or special-shaped steel pipes and composite metal pipes. Cold rolling and cold drawing methods can continue to process hot rolled pipes into small diameter and thin wall pipes.

The welding process of steel pipe is simple, the production efficiency is high, and the cost is low.

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