Products Description
The GB/T1591 Q390 series consists of five steel grades: Q390A, Q390B, Q390C, Q390D, and Q390E. For structural steel Q390B, low-temperature impact testing should be performed at -20°C to ensure sufficient toughness.
For thicker low-alloy Q390B steel plates, it is recommended to carry out normalizing heat treatment to improve mechanical performance and uniformity throughout the material.
Chemical Composition
| Main chemical elements composition of Q390D | ||||||||||
| C | Si | Mn | P | S | V | Nb | Ti | Al (min.) | Cr | Ni |
| 0.20 | 0.55 | 1.00-1.60 | 0.030 | 0.030 | 0.02-0.20 | 0.015-0.060 | 0.02-0.20 | 0.015 | 0.30 | 0.70 |
Mechanical Property
| Thickness (mm) | ||||
| Q390D | ≤ 16 | > 16 ≤ 35 | > 35 ≤ 50 | >50 |
| Yield strength (≥Mpa) | 390 | 370 | 350 | 330 |
| Tensile strength (Mpa) | 490-650 | |||
Q390B Yield strength
|
Nominal thickness (mm) |
To 16 |
16-40 |
40-63 |
63-80 |
80- 100 |
100- 150 |
150- 200 |
200- 250 |
250- 400 |
|
ReH - Minimum yield strength (MPa) |
390 |
370 |
350 |
330 |
330 |
310 |
- |
- |
- |
Q390B Tensile Strength
|
Nominal thickness (mm) |
To 40 |
40-63 |
63-80 |
80-100 |
100-150 |
150-250 |
250-400 |
|
ReH - Minimum yield strength (MPa) |
490-650 |
490-650 |
490-650 |
490-650 |
470-620 |
- |
- |
Q390B Impact Test degree and energy
|
|
Min Energy Nominal thickness |
||
|
Temperature ℃ |
20 |
||
|
Thickness (mm) |
12-150 |
150-250 |
250-400 |
|
Notch impact test. Min. absorbed energy |
34 |
- |
- |
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