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As a China factory and quality supplier, Longan stainless steel socket weld flange is engineered for demanding industrial applications requiring stable sealing and structural reliability. Featuring reduced heat affected zones, ultra-low helium leakage, and high surface precision, it performs well in petrochemical, aerospace, vacuum, and ultra-high purity gas systems.
Longan stainless steel socket weld flange is designed for industrial environments where sealing reliability, vibration resistance, thermal stability, and ultra-clean media transportation are essential. It is widely used in oil & gas transmission, petrochemical processing, power generation facilities, semiconductor gas systems, aerospace fueling infrastructure, hydrogen energy projects, and vacuum engineering applications.
The product is especially suitable for operations involving temperature fluctuation, corrosive media, vibration loads, or high-purity gas transport. Through advanced forging, precision machining, and digital production management, Longan ensures stable dimensional accuracy and dependable structural performance for demanding industrial conditions.
| Industry | Application Area | Performance Focus |
| Oil & Gas | High-pressure transmission pipelines | Leak prevention and corrosion resistance |
| Petrochemical | Chemical process systems | Thermal stability and sealing integrity |
| Power Generation | Steam and fluid transportation | Long-term structural reliability |
| Semiconductor | Ultra-clean gas delivery systems | Particle and contamination control |
| Aerospace | Cryogenic fuel pipelines | Low-temperature sealing performance |
| Fusion Energy | Vacuum and tritium systems | Ultra-low leakage capability |
Traditional welding processes often introduce excessive thermal energy into the connection area, increasing the possibility of structural deformation, corrosion sensitivity, and sealing instability over time.
Longan improves connection reliability through optimized socket structure and controlled thermal influence during assembly. Compared with traditional TIG welding heat input above 120J/mm, the optimized structure can reduce heat input to approximately 28J/mm, significantly lowering thermal stress on the material.
The heat affected zone can also be reduced from more than 500μm in conventional processes to around 80μm, helping maintain material stability and reducing the risk of intergranular corrosion.
| Performance Area | Traditional Process | Longan Improvement |
| Heat input | Higher thermal concentration | Reduced thermal influence |
| Heat affected zone | Over 500μm | Approximately 80μm |
| Thermal deformation risk | Higher | Lower |
| Corrosion resistance stability | Standard performance | Improved long-term consistency |
Industrial piping systems continuously experience vibration, pressure fluctuation, and thermal expansion. Conventional connection systems may develop stress concentration around sealing surfaces, increasing maintenance frequency and leakage risks.
Longan utilizes a multi-surface stress dispersion socket structure that helps lower strain energy density and improve assembly stability. Under thermal displacement conditions of ΔT=300℃, displacement control can be reduced from approximately 0.3mm to 0.008mm.
Pipeline assembly stress can also decrease from around 78MPa to 6MPa, while vibration attenuation capability is significantly enhanced. This allows the product to maintain more stable sealing performance in high-vibration industrial systems.
| Operational Parameter | Conventional Design | Longan Structure |
| Thermal displacement compensation | 0.3mm | 0.008mm |
| Pipeline assembly stress | 78MPa | 6MPa |
| Vibration attenuation | Limited control | Enhanced vibration reduction |
Surface precision directly affects leakage prevention, cleanliness, and operational stability. Longan applies precision machining and advanced surface finishing technology to improve sealing contact performance.
The sealing interface reaches a surface roughness level of approximately Ra 0.05μm through mirror polishing and refined surface shaping processes. Real sealing contact rate can exceed 99.6%, compared with conventional products often below 85%.
The stainless steel socket weld flange also demonstrates ultra-low helium leakage capability of ≤10⁻¹¹ mbar·L/s, supporting applications requiring high vacuum integrity and strict contamination control.
| Feature | Functional Benefit |
| Mirror-level surface finishing | Improved sealing consistency |
| High contact ratio | Lower leakage risk |
| Ultra-low helium leakage | Suitable for vacuum systems |
| Controlled adsorption energy | Reduced particle attachment |
| Precision-machined sealing surface | Stable long-term operation |
In semiconductor and precision electronics manufacturing, contamination control directly affects product yield and operational stability. Longan develops sealing solutions suitable for ultra-clean gas delivery systems.
In advanced wafer fabrication gas pipeline applications using 316L EP grade materials, particle release performance can be reduced from more than 5,000 pieces/m³·h to below 20 pieces/m³·h, supporting ISO Class 1 cleanliness requirements.
Helium inspection efficiency can also improve significantly, reducing inspection time from approximately 4 hours per joint to around 8 minutes per joint. Lower contamination risk contributes to more stable production environments.
Conventional flange systems may experience sealing instability under cryogenic temperatures, ultra-high purity gas environments, or extreme vacuum conditions. Longan focuses on maintaining performance consistency in these demanding applications.
| Extreme Environment | Conventional Limitation | Longan Advantage |
| Ultra-high purity silane systems | Higher metal ion precipitation | Extremely low contamination control |
| Rocket liquid hydrogen pipelines | Thermal shrinkage leakage | Stable cryogenic sealing |
| Fusion reactor systems | Higher tritium permeability | Enhanced vacuum integrity |
| High-vibration pipelines | Stress concentration | Improved structural stability |
For liquid hydrogen systems operating at temperatures near -253℃, the product maintains highly stable sealing capability under extreme thermal contraction conditions. In vacuum environments, extremely low leakage performance supports long-term operational reliability.
Longan utilizes an advanced ERP production management system covering the entire manufacturing process from raw material entry to finished product shipment.
The paperless digital workflow improves traceability, production consistency, and process accuracy throughout forging, machining, inspection, and testing stages. Every manufacturing step is monitored to ensure compliance with technical and quality requirements.
Integrated in-house production capability also enables tighter dimensional control and more stable delivery quality for large-scale industrial projects.
Longan specializes in manufacturing large industrial flanges up to 4 meters in diameter, supporting heavy-duty infrastructure and high-capacity pipeline projects.
The company primarily utilizes stainless steel materials while also supporting special material customization according to operating conditions and engineering requirements.
OEM manufacturing support is available for customized non-standard products, including project-specific dimensions, structures, and technical requirements.
To maintain stainless steel socket weld flange integrity during storage and transportation, packaging solutions are selected according to flange size, weight, and transportation distance.
Large and heavy products are protected using reinforced wooden crates, while smaller components are securely packed in durable cartons. Multiple transportation methods including truck and marine shipping are available according to project requirements.
Longan focuses on combining manufacturing precision, sealing technology, and stable engineering performance for demanding industrial applications.
- Large-diameter manufacturing capability up to 4 meters
- Full in-house forging, machining, and inspection control
- Reduced heat affected welding structure
- Ultra-low helium leakage performance
- High sealing surface contact ratio
- Stable performance under vibration and thermal cycling
- Suitable for ultra-high purity gas systems
- Digital ERP-based quality traceability
- OEM support for non-standard projects
- Reliable long-term operational stability
The stainless steel socket weld flange from Longan is engineered for industrial systems where sealing reliability, cleanliness control, and structural consistency are essential for continuous operation.
With advanced manufacturing capability, precision process control, and practical engineering focus, Longan continues to provide dependable flange solutions for critical industrial pipeline systems worldwide.
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NO. 620, MINGZHU ROAD, YONGXING STREET, LONGWAN DISTRICT, WENZHOU CITY, ZHEJIANG PROVINCE, CHINA.
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