seamless tube

Q345A seamless tube grade, is not to do the impact. Q345B level, is the impact of 20 degrees at room temperature. Q345C level, is the impact of 0 degrees. Q345D level, is -20 degrees shock. Q345E level, is -40 degrees shock. At different impact temperatures, the values of the impact are also different. Q The yield strength is not less than 345Mp The quality grade indicates the amount of impurity elements