GB713 Q370R steel Chemical composition:
|
Main chemical elements composition of Q370R |
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|
C |
Si |
Mn |
P |
S |
Nb |
|
0.18 |
0.55 |
1.20-1.60 |
0.025 |
0.015 |
0.015-0.050 |
GB713 Q370R steel Mechanical Property:
|
Thickness (mm) |
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|
Q370R |
> 3 ≤ 16 |
> 16 ≤ 36 |
> 36 ≤ 60 |
>60 ≤ 100 |
>100 ≤ 150 |
>150 |
|
Yield strength (≥Mpa) |
370 |
360 |
340 |
340 |
340 |
340 |
|
Tensile strength (Mpa) |
530-630 |
520-620 |
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FAQ
1. What are the key mechanical properties of Q370R plates?
Answer:
Q370R is a high-strength pressure vessel steel with:
Tensile strength: 530-680 MPa
Yield strength: ≥370 MPa
Elongation: ≥20% (for t≤16mm)
Impact toughness: ≥34J at 0°C (standard)
Thickness range: 5-150mm
2. How does Q370R compare to Q345R in composition and applications?
Answer:
Key differences:
| Parameter | Q370R | Q345R |
|---|---|---|
| Yield Strength | ≥370 MPa | ≥345 MPa |
| Alloy Content | Higher Nb/V microalloying | Basic C-Mn-Nb |
| CEV | ~0.44 | ~0.42 |
| Pressure Rating | 6.4-10MPa | 1.6-6.4MPa |
3. What heat treatment processes are required?
Answer:
Mandatory processing:
Normalizing (N): For all thicknesses
Optional TMCP: For improved toughness
Stress Relief: 580-620°C for thickness >50mm
4. What welding precautions are critical for Q370R?
Answer:
Essential welding practices:
Preheat: 120-180°C (for t>20mm)
Consumables: GB/T 5117 E5515-G or equivalent
Heat Input: 1.5-2.5 kJ/mm
Interpass Temp: ≤250°C
PWHT: Mandatory for thickness >32mm
5. Where is Q370R typically used?
Answer:
Primary applications:
High-pressure reactors (6.4-10MPa)
Power plant boiler drums
Thick-walled heat exchangers
Petrochemical vessels
Nuclear auxiliary equipment
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