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What does letter “D “ mean in the Q345D steel plate steel plate

Q345D steel plate belongs to low alloy high strength steel plate with good low temperature impact performance. Q345D steel grade is composed of three parts: Chinese phonetic alphabet, yield strength value, quality grade symbol representing yield strength. Among them:
Q indicates yield strength;
345 indicates yield strength value, unit MPa;
D indicates rank (-20 degree impact);

Q345D steel plate is a low Alloy steel plate under GB/T1591. Q345D steel plate is widely used in bridges, vehicles, ships, buildings, steel structures and so on. Q represents the yield of this material, and the latter 345 is the yield value of this material, around 345. D is different from the same kind of A, B, C grade, which is produced at low temperature impact of -20 C.

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