Does Q345R ASME equivalent exist? Is SA516 Gr 70 steel the Q345R ASME equivalent? Many wonder about it and want to get professional reply.
In order to anser this question, it is unavoidable to discuss the chemical composition and mechanical properties of SA516 Gr 70 steel and Q345R steel.
Chemical composition of SA516 Gr 70 steel and Q345R steel:
| Grade | C | Si | Mn | P | S | Alt |
| Q345R | ≦0.20 | ≦0.55 | 1.20-1.60 | ≦0.025 | ≦0.015 | ≧0.020 |
| SA516 Gr 70 | ≦0.27 | 0.13-0.45 | 0.79-1.60 | ≦0.035 | ≦0.035 |
Mechanical properties of SA516 Gr 70 steel and Q345R steel:
| Grade | Yield Strength | Tensile Strength | Elongation |
| (Mpa) | (MPa) | (%) | |
| Q345R | ≧325 | 500-630 | ≧21 |
| SA516 Gr 70 | ≧260 | 485-620 | ≧17 |
Q345R steel can meet chemical composition and mechanical properties demands of SA516 Gr 70 steel at most times. But that does not mean SA516 Gr 70 steel is the Q345R ASME equivalent. The steel strength property varies with the plate thickness. So it needs technician opinion to help choose between SA516 Gr 70 steel and Q345R steel according to the specific use and requirements.
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