Q345 low alloy pipe is a series of low alloy ---- low alloy high strength structural steel (GB / T1591-1994).
Q345A, B, C, D, E is the representative of such steel grades, of which Q345A alloy tube, Q345B alloy tube steel is usually called 16Mn, this material is the most common;
Q345 low alloy pipe said: Q represents the yield of this material, the back 345, refers to the yield value of this material, at about 345. (Similar to the Q235 naming method) and will reduce the yield value as the thickness of the material increases. glenflange
Low-alloy high-strength structural steel in addition to containing a certain amount of silicon or manganese basic elements, but also contains other elements suitable for China's resources. Such as trace elements such as vanadium, niobium, titanium, aluminum, molybdenum, nitrogen and RE. According to the chemical composition and performance requirements, the grade is Q295A, B, Q345A, B, C, D, E, Q390A, B, C, D, E, Q420A, B, C, D, E, Q460C, D, E, etc. Steel said that its meaning with carbon structural steel.
Q345 low alloy tube with carbon structural steel ratio. With high strength, good overall performance, long service life, wide range of applications, more economical and so on. The steel rolling into plates, profiles, seamless steel tubes, etc., are widely used in bridges, ships, boilers, vehicles and important building structures.glenflange
Q345A, Q345B, Q345C, Q345D, Q345E. This is the level of distinction, represented by the main impact of the temperature is different.
Q345A level, do not make impact; Q345B level is 20 degrees at room temperature impact; Q345C level is 0 degree impact; Q345D level is -20 degree impact; Q345E level is -40 degree impact. In different impact temperature, the impact of the value is different.
Due to the implementation of the standard, this plate allows negative tolerance delivery.