steel pipe material

Q345 is a kind of steel pipe material. It is alow alloy steel (C<0.2%), widely used in bridges, vehicles, ships,buildings, pressure vessels, etc.. Q represents the yield of this kind ofmaterial, the 345 refers to the yield value of this material, in the 345 or so.And the yield value decreases with the increase of the thickness of thematerial. Q345A, Q345B, Q345C, Q345D and Q345E is a class distinction,represented by the temperature, mainly temperature shocks are different, eachclass interval of 20 degrees Celsius, and Q345A level is no impact temperaturerequest; Q345B  is 20 degrees ambienttemperature impact; Q345C is 0 degrees impact; Q345D grade is 20 degrees belowzero; Q345E, is - 40 degrees of impact. At different impact temperatures, theimpact values are also different. It is belong to a low alloy series in steelplate. In the low alloy material, this material is the most common. 16Mn isanother name for Q345 in the past.