1.Comparison of material and elongation
Q460 steel plate is a low-alloy high-strength steel with elongation ≥17%.
Q690 steel plate belongs to high-strength welded structural steel with elongation ≥14%.
2. Comparison of yield strength
Q460 steel plate: Q represents the strength of steel, 460 represents 460 MPa, mega is 10 to the 6th power, and Pa is the pressure unit Pascal. Q460 means that plastic deformation occurs only when the force strength of the steel reaches 460 MPa, that is, when the external force is released, the steel can only maintain the shape of the force and cannot return to its original shape. This strength is greater than that of ordinary steel.
Q690 steel plate: Q stands for yield strength, 690 stands for yield strength value Q690 steel plate with different grades behind the impact temperature of Q690. The impact of grade D steel plate is -20°C. The impact of grade E steel plate is -40°C. The impact of grade C steel plate is 0°C
3. Comparison of chemical composition
Chemical composition of Q460 steel plate:
| Grade |
Chemical composition (mass fraction) (%) |
| C ≤ |
Mn≤ |
Si≤ |
P ≤ |
S ≤ |
V ≤ |
Nb ≤ |
Ti ≤ |
AI≥ |
Cr ≤ |
Ni ≤ |
| Q460 |
C |
0.20 |
1.80 |
0.60 |
0.030 |
0.030 |
0.20 |
0.11 |
0.20 |
0.015 |
0.30 |
0.80 |
| D |
0.030 |
0.025 |
| E |
0.025 |
0.020 |
The chemical compositon of Q690 steel plate
| The chemical compositon of Q690 steel plate |
| Steel Grade |
Quality Grade |
C |
Si |
Mn |
P |
S |
Nb |
V |
Ti |
Cr |
Ni |
Cu |
N |
Mo |
B |
Al |
| Q690 |
Q690C |
≤ 0.18 |
≤ 0.60 |
≤ 2.00 |
≤0.030 |
≤0.030 |
≤ 0.11 |
≤ 0.12 |
≤ 0.20 |
≤ 1.00 |
≤ 0.80 |
≤ 0.80 |
≤ 0.015 |
≤ 0.30 |
≤ 0.004 |
≥ 0.015 |
| Q690D |
≤0.030 |
≤0.025 |
| Q690E |
≤0.025 |
≤0.020 |
4. Comparison of mechanical properties
Mechanical properties of Q460 steel plate
Yield: ≤16mm: ≥460; 16-40mm: ≥440; 40-63mm: ≥420; 63-80mm: ≥400; 80—100mm: ≥400; 100—150mm: ≥380;
Tensile strength: 550-720.
Elongation: ≥17%.
Impact test: 0°C impact test: ≥34J.
Mechanical properties of Q690 steel plate
Yield: ≤16mm: ≥690; 16-40mm: ≥670; 40-63mm: ≥660; 63-80mm: ≥640.
Tensile strength: 730-940.
Elongation: ≥14.
Impact test: -20℃: ≥47.
5. Comparison of application
Q460 steel plate is mainly used in large ships, bridges, power station equipment, medium and high pressure boilers, high pressure vessels, rolling stock, hoisting machinery, mining machinery and other large welded structural parts.
Q690 steel plate has high yield strength and tensile strength, and is widely used in coal mining machinery and construction machinery, such as hydraulic supports, port cranes, flatbed trucks, etc.
