Q345B is a raw material in cold drawn seamless pipes. In the past, a name for seamless steel pipe. The current name is: Q345B cold drawn seamless pipe, and the nearby raw materials are Q345C, Q345D, Q345E, the quality grade symbol ABCDE indicates that the impact test is not required, and the impact test temperature is +20 degrees 0 degrees -20 degrees 40 degrees .
16. What is represented is that the carbon content in this steel is about 0.16%. Mn was proposed separately because of the high content of manganese among the five major elements (carbon C, silicon Si, manganese Mn, phosphorus P, and sulfur S). It is about 1.20-1.60%.
The main characteristics of Q345B cold drawn seamless pipe: good summary function, good low temperature function, good punching function, welding function and cutting function.
Q345B cold drawn seamless pipe anticorrosion and rust removal method
16Mn is also Q345 as carbon steel. 16Mn is basically not resistant to corrosion. If there is no good storage place but placed in an outdoor or humid environment, the carbon steel will rust. This requires him to be derusted.
1. Pickling
Generally, two methods of chemical and electrolysis are used for pickling treatment. Only chemical pickling is used for pipeline anti-corrosion, which can remove oxide scale, rust, and old coating. Sometimes it can be used as a reprocessing after sandblasting and rust removal. Although chemical cleaning can make the appearance reach a certain degree of cleanliness and roughness, its anchor lines are shallow and easily pollute the environment.
2. Cleaning
Use solvents and emulsions to clean the surface of steel to remove oil, grease, dust, lubricants and similar organic matter, but it cannot remove rust, oxide scale, solder, etc. on the surface of steel, so it is only used as an auxiliary method in anti-corrosion production.
3. Derusting things
Mainly use wire brushes and other things to polish the surface of steel, which can remove loose or warped oxide scale, rust, welding slag, etc. The manual tool rust removal of cold drawn seamless steel pipes can reach the Sa2 level, and the power tool rust removal can reach the Sa3 level.
Q345B cold drawn seamless pipe adopts rolling processing. Because the outer surface layer has residual compressive stress, it helps to close the small cracks on the surface and prevent the expansion of corrosion. So as to improve the appearance of corrosion resistance, and can delay the generation or expansion of fatigue cracks, thus improving the fatigue strength of Q345B cold drawn seamless pipe. After rolling forming, the rolling surface forms a cold-worked hardened layer, which reduces the elastic and plastic deformation of the grinding pair’s touch surface, thereby improving the wear resistance of the inner wall of the Q345B cold drawn seamless pipe and avoiding grinding Burns caused.
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