GB/T1591-2008 Q345D low alloy steel

GB/T1591-2008 Q345D low alloy steel plate and sheet
Grade: Q345D
Relative material: Q345A, Q345B, Q345C, Q345E
Standard: GB/T1591-2008
The grade of Q345D steel is composed of three parts: Chinese spelling letters representing yield strength, yield strength value, and quality grade symbol, for example: Q345D. among them:
Q—The first letter of the Chinese pinyin of the character "Qufu" of steel yield strength;
345—Yield strength value in MPa;
D—The quality grade is D grade (the grade is divided into A, B, C, D, E).
When the demand side needs the Q345D plates to have the thickness direction performance, add the symbol representing the thickness direction (Z direction) performance level after the above specified grade, for example: Q345DZ15.
Q345D steel chemical composition(%)
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.
Q345D material is a commonly used low alloy steel plate. Q345D steel plate is delivered in the state of hot rolling, controlled tie, normalizing, normalizing + tempering, and thermomechanical rolling (TMCP).