Products Description
Q390D is a low-alloy, high-strength steel designed for low-temperature-resistant, high-strength components. It is widely used in construction machinery, mining machinery, and heavy-duty structural parts.
This makes Q390D steel plate ideal for critical structural applications where both strength and low-temperature performance are required.
Products features
Low-alloy structural steel is also called ordinary low-alloy, HSLA steel. The specific analysis is as follows: Performance requirements of alloy structural steel:
(1) High strength: Generally, its yield strength is above 300MPa.
(2) High toughness: The elongation is required to be 15%-20%, and the room temperature impact toughness is greater than 600kJ/m～800kJ/m. For large welded components, higher fracture toughness is also required.
(3) Good welding performance and cold forming performance.
(4) Low cold brittle transition temperature.
(5) Good corrosion resistance.
Q390D Chemical compositionMax % of the Product analysis of grade
|
C |
Si |
Mn |
P |
S |
Nb |
V |
Ti |
|
0.20 |
0.50 |
1.70 |
0.030 |
0.025 |
0.07 |
0.20 |
0.20 |
|
Cr |
Ni |
Cu |
N |
Mo |
B |
Als min |
|
|
0.30 |
0.50 |
0.30 |
0.015 |
0.10 |
- |
0.015 |
|
Q390D 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 |
- |
- |
- |
Q390D 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 |
- |
- |
Q390D 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 |
- |
- |
Products Application
Q390D low-alloy high-strength steel is primarily used for the manufacture of low-temperature-resistant, high-strength key components, as well as construction and mining machinery structures.
Mechanical Properties:
Yield Strength: ≥390 MPa
Tensile Strength: 470–610 MPa
Elongation: ≥20%
Low-Temperature Performance:
Impact testing typically performed at -20°C, ensuring reliable toughness under cold conditions.
Typical Thickness Range: 10–50 mm, allowing application in both medium and heavy structural components.
Application Examples:
Construction machinery: cranes, excavators, and loaders
Mining equipment: rock crushers, mining frames, and conveyors
Key structural components: heavy-duty brackets, beams, and supports in low-temperature environments
Using Q390D steel improves strength-to-weight ratio, enhances impact resistance, and ensures long-term durability under demanding mechanical and environmental conditions.
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