Seamless steel pipe is a steel pipe made of whole round steel pierced without welded seams on the surface, called seamless steel pipe. According to the production method, seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, top pipe, etc. According to the shape of the section, seamless steel pipe is divided into two kinds of round and shaped, shaped pipe has a square, oval, triangular, hexagonal, melon, star, with a variety of complex shapes finned tube. Depending on the application, there are thick-walled seamless steel tubes and thin-walled seamless steel tubes. Seamless steel tubes are mainly used as petroleum geological drilling tubes, petrochemical cracking tubes, boiler tubes, bearing tubes, and high-precision structural steel tubes for automobiles, tractors, and aviation.

What is the difference between Q345A, Q345B, Q345C, Q345D, Q345E steel function, the difference between Q345A, Q345B, Q345C, Q345D, Q345E steel function, you can tell the difference?Q345 is a kind of raw material of steel. It is low alloy steel (C<0.2%), widely used in construction, bridges, vehicles, ships, pressure vessels, etc.
 
Q represents the yield strength of this raw material, the latter 345, means the yield value of this raw material, around 345 MPa. Q345 has good overall mechanical function and low temperature function.
 
Good plasticity and weldability, used as low and medium pressure containers, tanks, vehicles, cranes, mining machinery, power stations, bridges and other structures that bear dynamic loads, mechanical parts, construction structures, general metal structural parts, hot-rolled or normalized state use, can be used for -40 ℃ below the ice-cold region of various structures.
 
Q345A, Q345B, Q345C, Q345D, Q345E steel functional differences, you distinguish?Q345 can be divided into Q345A, Q345B, Q345C, Q345D, Q345E by grade.What they represent, mainly the impact of the temperature is different.