Low alloy steel ASTM A572 Gr 50 is considered the "working horse" class and is widely used in in structural applications, heavy construction equipment, building structures, heavy anchoring systems, truck frames, and applications requiring high strength/weight ratios. Low alloy steel ASTM A572 Gr 50 is usually produced into steel plates, Channel steel and heavy steel beams.
Low alloy steel ASTM A572 Gr 50 equivalent material such as EN S355J2-steel_4448.html target=_blank class=infotextkey>S355JR, DIN ST52-3, JIS SM490B, GB Q345B has much in common with steel ASTM A572 Gr 50.
Chemical composition of Low alloy steel ASTM A572 Gr 50 equivalent material:
| Grade | C (t≤16mm) | Si | Mn | P | S | Cu | N | Mo |
| A572 Gr 50 | 0.23 max | 0.40 max | 1.35 max | 0.04 max | 0.05 max | - | - | - |
| S355JR | 0.27 max | 0.60 max | 1.70 max | 0.045 max | 0.045 max | 0.60 max | 0.014 max | - |
| ST52-3 | 0.22 max | - | - | 0.50 max | 0.50 max | - | - | - |
| SM490B | 0.20 max | 0.55 max | 1.60 max | 0.035 max | 0.035 max | - | - | - |
| Q345B | 0.20 max | 0.50 max | 1.70 max | 0.035 max | 0.035 max | 0.30 max | 0.012 max | 0.1 max |
Mechanical properties of Low alloy steel ASTM A572 Gr 50 equivalent material:
| Grade | Yield strength ReH/(N/mm2) (t≤16mm) min | Tensile strength Rm/(N/mm2) (3mm≤t≤16mm) | Elongation A/%(3mm≤t≤40mm) min | Charpy V test | |
| Temperature/℃ | Impact energy (Longitudinal)/J min | ||||
| A572 Gr 50 | 345 | 450 | 18 | - | - |
| S355JR | 355 | 470-630 | 22 | 20 | 27 |
| ST52-3 | 355 | 490-630 | 22 | 0 | 27 |
| SM490B | 295 | 490-610 | 18 | ||
| Q345B | 345 | 470-630 | 20 | 20 | 34 |
Among low alloy steel ASTM A572 Gr 50 equivalent material, EN S355JR is most widely used in the structural engineering and construction industries. JIS SM490B is also popular mainly in Asia. With the expanding of International business of China, the GB Q345B also spread into the globle construction site and known to many steel insiders. Origioned in Germany, DIN ST52-3 steel is also known to engineers. But its production is less popular now. In China, BBN steel is one of the steel mills that can supply full range of the low alloy steel ASTM A572 Gr 50 equivalent material.
Just like you, 70% customers choose long-term cooperation with BBN steel not only for our good product and service quality, good reputation in the international market, but also for our experienced one-stop raw material supply and further steel processing!
