GB T1591 Q345B steel is Chinese low alloy high strength steel. The low alloy high strength steel has wide application in the world. In ASTM standard, there is also low alloy high strength steel, and the most widely used among them is ASTM A572 Gr 50 steel, which is GB T1591 Q345B steel equivalent ASTM material.
The equivalent of GB T1591 Q345B steel and ASTM A572 Gr 50 steel are mainly expressed in similarity of chemical composition and mechanical properties.
Chemical composition of GB T1591 Q345B steel and ASTM A572 Gr 50 steel:
| 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 | 0.1max |
| A572 Gr 50 | 0.26 max | 0.40 max | 1.65 max | 0.040 max | 0.050 max | - | - | - | - | - | - | - | - |
Mechanical properties of ASTM A572 Gr 50 equivalent material:
| Grade | Yield strength ReH/(N/mm2) | Tensile strength Rm/(N/mm2) | Elongation A/% | Charpy V test | |
| (t≤16mm) min | (3mm≤t≤16mm) | (3mm≤t≤40mm) min | Temperature/℃ | Impact energy (Longitudinal)/J min | |
| Q345B | 345 | 470-630 | 20 | 20 | 34 |
| A572 Gr 50 | 345 | 450 | 18 | - | - |
BBN steel supplies GB T1591 Q345B steel equivalent ASTM A572 Gr 50 steel and other foreign standard low alloy high strength steel (such as ST52-3, SM490A, FE510B, E36-2) as well. Other than standard size GB T1591 Q345B steel and ASTM A572 Gr 50 steel plates etc. products, BBN steel also provide non-standard size steel materials though cutting, bending, welding and so on deep processing.
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!
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