Q345qE chemical composition

Chemical Composition%
C Si Mn PS Als
Q345qE ≤ 0.17 ≥ 0.50 1.2 ~ 1.6 0.020 0.015 ≥ 0.015
Dissolved aluminum (Als) Determination of total aluminum content instead of the aluminum content shall not be less than 0.02%.
Of vanadium, niobium, nitrogen, and other trace elements can be added to improve the properties of steel products shall conform to the requirements in Table 2, and should be in the quality certificate

Forward to specify.

V Nb Ti N
≤ 0.08 ≤ 0.045 ≤ 0.02 ≤ 0.018
The residual elements chromium, nickel, copper content should be not more than 0.30% each.
The bridge steel of various grades of carbon equivalent shall conform to the requirements in Table 3.

Grades Q345q Q370q Q420q
Cеq 0.43 0.44 0.45
Carbon equivalent is calculated by following formula:
Cеq (%) = C + Μn / 6 + Si/24 + Ni/40 + Cr / 5 + Μo / 4 + V/14