Q345B grade is a kind of steel material. It is carbon alloy steel. The character Q in Q345B represents the first letter of the Chinese pinyin of "yield" which is the yield strength of steel; 345 represents the value of the yield strength; character B represents the quality grade of steel as b-level.
Q345B grade composition(%)
|
C |
Si |
Mn |
P |
S |
Nb |
V |
|
≤0.2 |
≤0.5 |
≤1.7 |
≤0.035 |
≤0.035 |
≤0.07 |
≤0.15 |
|
Ti |
Cr |
Ni |
Cu |
N |
Mo |
|
|
≤0.2 |
≤0.3 |
≤0.5 |
0.3 |
≤0.012 |
≤0.1 |
|
The naming method of Q345B is similar to Q235. Q345A, Q345B, Q345C, Q345D, Q345E. This is the distinction of grades, and what it represents is that the temperature of the impact is different! Q345a level is no impact; Q345B level is 20 degrees normal temperature impact; Q345C level is 0 degrees impact; Q345D level is -20 degrees impact; Q345E level is -40 degrees impact. At different impact temperatures, the impact values are also different.
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