Chemical composition of Q420NB steel plate:
Q420NB steel plate is a low alloy high strength steel plate, which complies with the GB/T1591-2018 standard. In this standard, Q420N grade steel is divided into four quality grades according to the impact temperature: Q420NB, Q420NC, Q420ND, Q420NE.
Q420NB steel plate delivery status:
The buyer can choose the heat treatment state according to its own needs, and can also add the flaw detection standard requirements, flaw detection level requirements, alloy element composition control requirements, Z-direction performance requirements, etc., but it needs to communicate with the manufacturer and sign a written agreement at the time of inquiry or rolling order.
Chemical composition of Q420NB steel plate:
| C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | Mo | N | Als* |
| ≤0.2 | ≤0.6 | 1.00-1.70 | ≤0.035 | ≤0.035 | 0.01-0.05 | 0.01-0.20 | 0.006-0.05 | ≤0.3 | ≤0.8 | ≤0.4 | ≤0.1 | ≤0.015 | ≥0.015 |
*: It can be replaced by all-aluminum Alt. At this time, the minimum content of all-aluminum is 0.020%. When niobium, vanadium, titanium and other refined grain elements are added to the steel and the content is not less than the lower limit of the content specified in the table, the lower limit of aluminum content is not limited.
Q420NB steel plate yield strength:
| Thickness | ≤ | >16 | >40 | >63 | >80 | >100 |
| (mm) | 16 | ≤40 | ≤63 | ≤80 | ≤100 | ≤150 |
| Q420B | 420 | 410 | 390 | 370 | 370 | 350 |
Tensile strength of Q420NB steel plate:
| Thickness (mm) | ≤100mm | 100-150mm | 150-250mm |
| Q420NB/C/D/E | 520-680 | 500-650 | 500-650 |
Production process of Q420NB steel plate:
Q420NB steel plate is smelted by electric furnace or converter. If necessary, it can be refined outside the furnace. Unless the demander has special requirements and is specified in the contract, the smelting method is generally selected by the supplier.
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