Material Q345B is produced in hot rolled state. For example, Q345B hot rolled steel plate, Q345B hot rolled steel coil/sheet. Material Q345B has comprehensive mechanical and welding property. As it shows good performance in structural purposes, material Q345B is widely used as welding structural part in manufacturing of ship, railway and vehicles, bridges, boiler,etc.
What is material Q345B equivalent ASTM steel? To some extent, the material Q345B possesses the same property and composition of ASTM A572 Gr 50 steel, namely the material Q345B equivalent ASTM steel is A572 Gr 50.
Material Q345B equivalent ASTM steel A572 Gr 50 chemical composition:
| Grade |
C (t≤16mm) |
Si |
Mn |
P |
S |
Nb |
V |
Ti |
Cr |
Ni |
Cu |
N |
Mo |
| Q345B |
0.20 max |
0.50 max |
1.70 max |
0.035 max |
0.035 max |
0.07 max |
0.15 max |
0.20 max |
0.30 max |
0.50 max |
0.30 max |
0.012 max |
0.1 max |
| A572 Gr 50 |
0.23 max |
0.40 max |
1.35 max |
0.04 max |
0.05 max |
- |
- |
- |
- |
- |
- |
- |
- |
Material Q345B equivalent ASTM steel A572 Gr 50 mechanical properties:
| Grade |
Yield strength ReH/(Mpa) (t≤16mm) min |
Tensile strength Rm/(Mpa) (3mm≤t≤16mm) |
Elongation A/%(3mm≤t≤40mm) min |
Charpy V test |
| Temperature/℃ |
Impact energy (Longitudinal)/J min |
| Q345B |
345 |
470-630 |
20 |
20 |
34 |
| A572 Gr 50 |
345 |
450 |
18 |
- |
- |
The major benefit of material Q345B is its mild temper. Material Q345B is easy to form and easy to weld. Material Q345B is the combination of comparatively low price and ease of use, and that makes material Q345B a widely used material in construction.
