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Flat Flange
QS Flange: Flat Flange
Name: Flat Flange
Standard: ANSI B16.5
Size: 1/2 to 24 Inch
Pressure: 150LB to 600LB
Material: Carbon Steel
Process Method: Forged
Face: FF
Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.
Standard: ANSI B16.5
Size: 1/2 to 24 Inch
Pressure: 150LB to 600LB
Material: Carbon Steel
Process Method: Forged
Face: FF
Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.
Quantity
Flat Flange – Available in sizes from 1/2 inch to 24 inches with pressure ratings from 150LB to 600LB. Manufactured through carbon steel forging (A105), it delivers exceptional performance. Its flat face (FF) sealing design ensures easier installation and more reliable sealing, making it the ideal choice for construction, chemical, petroleum, and natural gas applications.
Flat Flange Production Process Comparison
| Performance Metric | Forged Flat Flange (A105) | Cast Flange (WCB) | Performance Gain |
| Tensile Strength (MPa) | 485-655 | 415-585 | +17% |
| Yield Strength (MPa) | ≥250 | ≥205 | +22% |
| Elongation (%) | 18-22 | 12-18 | +35% |
| Impact Energy (J, 20°C) | ≥27 | ≥20 | +35% |
Core Advantages of Flat Flange
- Grain size: ASTM 5-8 (20-50μm)
- Porosity: <0.1%
- Streamlined fiber structure
- Grain size: ASTM 5-8 (20-50μm)
- Porosity: <0.1%
- Streamlined fiber structure
Engineering Performance
1. Fatigue Life: >10⁶ cycles at 300MPa stress (2× longer than cast flanges)
2. Low-Temperature Performance: Impact energy ≥27J at -46°C
3. Quality Assurance: 100% ultrasonic + magnetic particle inspection
1. Fatigue Life: >10⁶ cycles at 300MPa stress (2× longer than cast flanges)
2. Low-Temperature Performance: Impact energy ≥27J at -46°C
3. Quality Assurance: 100% ultrasonic + magnetic particle inspection
Selection Guide
- Prefer Flat Flange when:
- Pressure ≥300LB
- Temperature <-29°C or >425°C
- Vibration/cyclic loading present
- Prefer Flat Flange when:
- Pressure ≥300LB
- Temperature <-29°C or >425°C
- Vibration/cyclic loading present
- Cast flanges suitable for:
- Low-pressure static pipelines (≤150LB)
- Non-critical auxiliary systems
- Low-pressure static pipelines (≤150LB)
- Non-critical auxiliary systems
Although Flat Flange costs 20-30% more than cast flanges, its extended service life and superior reliability make it the preferred solution for critical applications in oil, chemical, and other demanding industries.
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