Chemical composition of Q345B Vs Q345D steel

The Q345D steel grade low alloy steel plate is composed of three parts: Chinese spelling letter representing yield strength, yield strength value, and quality grade symbol. Among them: the first letter of Chinese pinyin of “yin” of Q—steel yield strength; 345—yield strength Value, unit MPa; D—quality grade is D grade (grade is divided into A, B, C, D, E)

Q345B steel plate impact test: test temperature: 20 ℃: greater than 34.
Q345D steel plate impact test:: -20 ℃: ≥34.

Chemical composition of Q345B steel plate

C: ≤0.20%, Si≤0.50%, Mn: ≤1.70%, P≤0.035%, S: ≤0.035%, Nb≤0.07%, V: ≤0.15%, Ti≤0.20%, Cr≤0.30%, Ni : ≤0.50%, Cu: ≤0.30%, N: ≤0.012%, Mo: ≤0.10%
Chemical composition of Q345D steel plate:
C: ≤0.18; Si: ≤0.50; Mn: ≤1.70; P: ≤0.030; S: ≤0.025; Nb: ≤0.07; V: ≤0.15; Ti: ≤0.20; Cr: ≤0.30; Ni: ≤0.50; Cu: ≤0.30; N: ≤0.012; Mo: ≤0.10; Als: ≥0.015.
If you are looking for Q345B plate or Q345D low alloy steel plate supplier, welcome to contact us. We can supply hot rolled Q345B steel plates and Q345D steel sheets with large stock. 

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