If you need to know more, you can directly click on the model number, and the webpage will jump to the detailed introduction of the model.
| Grade | Quality Grade | Manufacturing execution standards |
| Q355 | B、C | GB/T 1591 |
| D、E | GB/T 1591 | |
| Q355 | B(AR) | GB/T 1591 |
| C(AR) | GB/T 1591 | |
| D(AR) | GB/T 1591 | |
| Q355N | B、C | GB/T 1591 |
| D、E、F | GB/T 1591 | |
| Q355M | B、C | GB/T 1591 |
| D、E、F | GB/T 1591 | |
| Q390 | B(AR) | GB/T 1591 |
| C(AR) | GB/T 1591 | |
| D(AR) | GB/T 1591 |