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Name: Xiamen Stainless Steel Flange Material: Stainless Steel Standard: ANSI B16.5 Size: 1/2 to 24 Inch Pressure: 150LB to 2500LB Process Method: Forged Type: SO/ WN/ BL Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.QS Flange: Xiamen Stainless Steel Flange
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Name: Pipe Floor Flange Material: Carbon Steel Standard: ASME B16.5 Pressure: 150LB to 2500LB Size: 1/2 to 24 Inch Process Method: Forged Face: RF Usage: Commonly Used in Water Systems, Oil and Gas pipelinesQS Flange: Pipe Floor Flange
Name: ASME B16.5 Blank Flange Type: BL Face: RF Standard: ASME B16.5 Process Method: Forged Material: Carbon Steel Pressure: 150LB Size: 1/2 to 24 Inch Usage: Commonly Used in Water Systems, Oil and Gas pipelinesQS Flange: ASME B16.5 Blank Flange
Steel Pipe Flange
QS Flange: Steel Pipe Flange
Name: Steel Pipe Flange
Material: Stainless Steel
Standard: ASME B16.5
Pressure: 150LB to 2500LB
Size: 1/2 to 24 Inch
Process Method: Forged
Type: WN
Face: RF
Usage: Used in Boiler and Pressure vessel, Petroleum, Chemical, Shipbuilding, Pharmaceutical, Metallurgy, Machinery and FOOD and other industries
Material: Stainless Steel
Standard: ASME B16.5
Pressure: 150LB to 2500LB
Size: 1/2 to 24 Inch
Process Method: Forged
Type: WN
Face: RF
Usage: Used in Boiler and Pressure vessel, Petroleum, Chemical, Shipbuilding, Pharmaceutical, Metallurgy, Machinery and FOOD and other industries
Quantity
The Steel Pipe Flange is precision-forged from high-quality stainless steel, strictly compliant with ASME B16.5 standards, and available in pressure ratings from 150LB to 2500LB to meet high-pressure, high-temperature, and extreme working condition requirements. With sizes ranging from 1/2"to 24", the Steel Pipe Flange features a Raised Face (RF) design, ensuring superior sealing performance and structural integrity. Widely used in boilers, pressure vessels, petroleum, chemical processing, shipbuilding, pharmaceuticals, metallurgy, machinery, and food industries, the Steel Pipe Flange offers exceptional corrosion resistance, oxidation resistance, and long service life, making it a critical connecting component in industrial piping systems.
Among Steel Pipe Flange variants, the Weld Neck (WN) flange stands out as the preferred solution for high-pressure, high-temperature, and cyclic loading applications due to its optimized structural design. Below is a detailed technical analysis of its three key structural features:
1. Extended Neck Design
The Steel Pipe Flange incorporates an extended neck with a gradual thickness transition (typically at a 15°–30° taper angle), ensuring smooth stress transfer from the flange ring to the pipe and avoiding stress concentrations at abrupt cross-sections.
The Steel Pipe Flange incorporates an extended neck with a gradual thickness transition (typically at a 15°–30° taper angle), ensuring smooth stress transfer from the flange ring to the pipe and avoiding stress concentrations at abrupt cross-sections.
Mechanical Performance Comparison:
| Load Type | Stress Concentration Factor (Kt) | Compared to Slip-On (SO) Flange |
| Static Pressure | 1.2–1.5 | SO Flange Kt=2.0–3.0 |
| Cyclic Loading (10⁶ cycles) | Fatigue life increased by 3–5x | SO prone to fillet weld cracking |
Key Advantage:
The neck design of the Steel Pipe Flange enables WN flanges to achieve fatigue life comparable to seamless pipes, making them ideal for long-term high-stress environments.
The neck design of the Steel Pipe Flange enables WN flanges to achieve fatigue life comparable to seamless pipes, making them ideal for long-term high-stress environments.
2. Complete Joint Penetration (CJP) Weld
The Steel Pipe Flange utilizes full-penetration (CJP) welds to ensure weld strength matching the base material, complying with international standards:
The Steel Pipe Flange utilizes full-penetration (CJP) welds to ensure weld strength matching the base material, complying with international standards:
Welding Standards & Processes:
- ASME BPVC Sec. IX: Specifies groove angle, gap, and penetration rate (100% penetration).
- ISO 15614-1: Requires weld metal strength ≥ base material’s minimum tensile (UTS) and yield strength (YS).
- ASME BPVC Sec. IX: Specifies groove angle, gap, and penetration rate (100% penetration).
- ISO 15614-1: Requires weld metal strength ≥ base material’s minimum tensile (UTS) and yield strength (YS).
Typical Groove Designs:
- V-Groove (60°, 1–2mm root face, suitable for SMAW/GTAW).
- U-Groove (R=5mm, 1.5mm root face, suitable for thick-wall SAW welding).
- V-Groove (60°, 1–2mm root face, suitable for SMAW/GTAW).
- U-Groove (R=5mm, 1.5mm root face, suitable for thick-wall SAW welding).
Weld Mechanical Properties:
| Material Combination | Weld Strength (MPa) | Impact Toughness (-46°C, J) | Inspection Method |
| A106B + E7018 | ≥485 (UTS) | ≥27 (Charpy V-Notch) | RT/UT + Hardness Test |
| 316L + ER316L | ≥485 (UTS) | ≥40 (Cryogenic Test) | PT + Ferrite Content Check |
Key Point:
Post-Weld Heat Treatment (PWHT) of the Steel Pipe Flange eliminates residual stresses, enhancing long-term stability.
- Non-destructive testing (RT/UT) ensures 100% weld quality compliance.
Post-Weld Heat Treatment (PWHT) of the Steel Pipe Flange eliminates residual stresses, enhancing long-term stability.
- Non-destructive testing (RT/UT) ensures 100% weld quality compliance.
3. Tapered Transition Zone
The Steel Pipe Flange features a tapered transition zone (7°–15° inclination) to optimize fluid dynamics, reducing turbulence and pressure drop:
The Steel Pipe Flange features a tapered transition zone (7°–15° inclination) to optimize fluid dynamics, reducing turbulence and pressure drop:
Fluid Dynamics Analysis:
| Flange Type | Local Resistance Coefficient (K) | Pressure Drop (Pa) |
| WN Flange | 0.05–0.10 | 80–120 |
| SO Flange | 0.15–0.30 | 200–350 |
Structural Contribution:
- The Steel Pipe Flange provides 30%–50% higher bending resistance than SO flanges, making it suitable for high-vibration applications.
- The tapered structure absorbs thermal expansion displacement, complying with ASME B31.3 flexibility requirements.
- The Steel Pipe Flange provides 30%–50% higher bending resistance than SO flanges, making it suitable for high-vibration applications.
- The tapered structure absorbs thermal expansion displacement, complying with ASME B31.3 flexibility requirements.
Conclusion
The Steel Pipe Flange integrates an extended neck, CJP welds, and a tapered transition zone into a unified design, establishing it as the preferred choice for High-Integrity Pressure Piping Systems (HIPPS). In practical engineering applications, the Steel Pipe Flange must be validated through Finite Element Analysis (FEA) and Welding Procedure Qualification (PQR) to ensure performance compliance, meeting the stringent demands of global industrial piping systems.
The Steel Pipe Flange integrates an extended neck, CJP welds, and a tapered transition zone into a unified design, establishing it as the preferred choice for High-Integrity Pressure Piping Systems (HIPPS). In practical engineering applications, the Steel Pipe Flange must be validated through Finite Element Analysis (FEA) and Welding Procedure Qualification (PQR) to ensure performance compliance, meeting the stringent demands of global industrial piping systems.
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