WELD NECK FLANGE
Neck welding flange is a type of flange that is butt-welded to the pipe through a conical neck structure. Its welding requires a double-sided welding process, which has higher connection strength and stress resistance. It is especially suitable for working conditions with high temperature and high pressure, low temperature, and severe temperature and pressure fluctuations. Its structural design effectively reduces stress concentration and improves sealing performance by optimizing the transition section between the conical neck and the round pipe.
STRUCTURAL EXCELLENCE
Long Tapered Hub Design:
Gradually transitions from flange thickness to pipe wall, minimizing stress concentration
Reinforced Neck:
Provides exceptional strength and fatigue resistance for demanding applications
Full Penetration Welding:
Ensures complete joint integrity and leak-proof connections
| TECHNICAL PARAMETERS |
| Products |
Steel Flange |
| Flange Size |
1/2"-24"; DN15-DN600 |
| Flange Class |
150#; 300#; 400#; 600#; 900#; 1500#; 2500# |
| Flange Material |
Carbon Steel; Stainless Steel; Duplex Steel; Copper Nickel Etc. |
| Flange Material Grade |
ASTM A105,ASTM A350 LF1. LF2, LF6,16MN, ASTM A182,F1,F5,F9,F11,F22, ASTM A182 F304/304L, F316/316L, F316Ti, F321, F904, UNS N08020, UNS N06625, HAS C276 etc. |
| Flange Standard |
ANSI /ASME B16.5/16.47;DIN;BS;EN 1092-1;GOST;JIS;AWWA C207 etc. |
| Flange Type |
Weld Neck; Slip On; Lap Joint; Blind Flange; Socket Flange; Spectacle Blind Flange; Orifice Flange; Long Weld Flange Etc. |
| Flange Surface Treatment |
Anti-Rust Oil; Electricle Galvanized; Hot Dipped Galvanized; Painting Etc. |
| Flange Connection |
Welding; Lap Joint; Threaded |
| Flange Heat Treatment |
Normalizing; Annealing; Quenching+Tempering |
| Application Industry |
Oil&Gas; Water Treatment; Electric Power; Chemical |
SUPERIOR STRENGTH & DURABILITY
Reinforced neck design with long tapered hub provides maximum mechanical strength and extends service life by 40% compared to standard flanges - ideal for high-stress applications
ZERO-LEAK PERFORMANCE
Full penetration butt weld connection ensures 100% leak-proof joints with complete structural integrity - critical for hazardous media and high-pressure systems up to 2500# class
EXCEPTIONAL STRESS DISTRIBUTION
Smooth stress transition from flange to pipe eliminates stress concentration points, reducing fatigue failure by 60% in cyclic loading and vibration-prone environments
VERSATILE APPLICATION RANGE
-200°C to 815°C temperature range, suitable for oil & gas, petrochemical, power generation, and offshore applications with multiple material options
INDUSTRY-STANDARD COMPLIANCE
Meets all major international standards (ASME B16.5, B16.47, DIN, JIS, EN) with full traceability, RTJ/RF/FF face options, and third-party certification available for critical service
Q1: Do you produce directly?
A: Yes! We are a manufacturer-based company with complete equipment.
Q2: What is your minimum order quantity?
A: The minimum order quantity is 1 piece, and the price is affected by quantity, size, and material.
Q3: Are there free samples?
A: Yes, but customers need to pay for shipping.
Q4: Do you need to check before shipment?
A: Yes, all shipments must be checked for size, PMI, and quantity; any third-party inspection, please inform us before placing an order.
Audited Supplier 
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