Flange
Industrial Flange Manufacturer for Critical Piping Systems
Manufactured in accordance with ASME, EN, DIN and JIS standards, our forged flanges are supplied to EPC contractors, oil & gas companies, power plants and industrial equipment manufacturers in more than 20 countries. Every flange is backed by full EN 10204 3.1 traceability, PMI inspection and third-party certification.
Why Choose Us
100% Traceability (EN 10204 3.1 MTR)
Each flange is marked with a furnace number, which is directly linked to its raw material chemical composition analysis and mechanical property test reports.
Global Compliance
We manufacture flanges in accordance with ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS, and customer-specific international specifications.
Advanced CNC Machining Precision
All sealing surfaces (RF, FF, RTJ) are guaranteed to have strict tolerances, thus avoiding on-site installation delays.
Fast Delivery Cycles and Scalable Capacity
Annual forging capacity exceeding 20,000 tons, with ample raw material inventory to meet tight project deadlines.
Types of Flanges We Manufacture
We offer a comprehensive selection of industrial flanges ranging from 1/2" to 60" (DN15 - DN1500) in size, available in pressure ratings from Class 150 to Class 2500 (PN6 to PN400).
|
Flange Type |
Typical Applications |
Pressure Ratings |
Facing Options |
|
Welding Neck (WNF) |
High-pressure, severe temperature pipelines; avoids stress concentration. |
Class 150 - 2500 |
RF, RTJ |
|
Slip-On (SOF) |
Low-pressure systems; easier alignment and lower fabrication costs. |
Class 150 - 600 |
RF, FF |
|
Blind Flange (BLIND) |
Sealing the end of piping systems or pressure vessel openings. |
Class 150 - 2500 |
RF, FF, RTJ |
|
Socket Weld (SWF) |
Small-diameter, high-pressure hydraulic and steam lines. |
Class 150 - 1500 |
RF |
|
Threaded Flange (TH) |
Highly specialized low-pressure lines where welding is prohibited. |
Class 150 - 2500 |
RF, FF |
|
Lap Joint (LJF) |
Systems requiring frequent dismantling for inspection or cleaning. |
Class 150 - 600 |
Flat Face |
Premium Materials & Metallurgical Integrity
Material selection has a direct impact on pressure resistance, corrosion performance, service life, and total lifecycle cost. Our engineering team helps customers select the most suitable material based on operating temperature, pressure, and process media.
Stainless Steel
ASTM A182 F304/304L, F316/316L, F321, F347 (Excellent corrosion resistance for chemical, pharmaceutical, and offshore processing).
Carbon Steel
ASTM A105, A350 LF2 (Engineered for ambient and higher-temperature service, or low-temperature impact testing).
Alloy Steel
ASTM A182 F5, F11, F22, F91 (High tensile strength and creep resistance for high-temperature power plant piping).
Duplex & Super Duplex Steel
F51 (UNS S31803), F53 (UNS S32750) (Optimized for marine environments and highly aggressive chloride applications).
Our Manufacturing Process
Our facility employs a closed-die and ring-rolling forging process that refines the grain structure of the steel, maximizing grain flow and fatigue resistance.
Raw Material Inspection
Every steel billet undergoes Positive Material Identification (PMI) and ultrasonic testing before cutting to ensure zero internal voids.
Precision Forging & Ring Rolling
Billets are heated to 1100–1250°C and forged under high-tonnage hydraulic presses to refine the grain structure, optimize grain flow, and improve mechanical strength and fatigue resistance.
Solution Annealing & Heat Treatment
Heat treatment processes are selected according to the material grade and project requirements. Depending on the specification, flanges may undergo normalizing, quenching and tempering, solution annealing, or stress relieving to restore mechanical properties, improve corrosion resistance, and ensure compliance with hardness and impact requirements.
CNC Machining & Facing (Micro-Inch Precision)
Advanced CNC machining ensuring precise fit-up and reducing installation time during field installation. RF, FF, and RTJ facings are machined to ASME B16.5 surface finish requirements, ensuring consistent sealing performance.
Quality Assurance
Our Zero-Defect Inspection Protocol includes:
Dimensional Inspection
100% check of outer diameters, thickness, bolt circle diameters, and alignment.
Non-Destructive Testing (NDT)
Ultrasonic Testing (UT), Magnetic Particle Inspection (MPI), and Liquid Penetrant Testing (LPI) to guarantee sub-surface integrity.
Destructive Testing
Tensile strength tests, Charpy V-Notch impact tests, and hardness testing on a per-heat-number basis.
Third-Party Friendly
We fully welcome and regularly host inspectors from SGS, TÜV, Bureau Veritas (BV), and DNV.
Applications
Oil & Gas
The Challenge: High-pressure hydrocarbons, sour gas (H2S), and subsea corrosion.
Our Solution: Heavy-wall WNF & RTJ flanges fully compliant with NACE MR0175/ISO 15156 to prevent Hydrogen-Induced Cracking (HIC) in refineries and offshore rigs.
Power Generation & Steam Systems
The Challenge: Ultra-supercritical temperatures (＞500℃) and constant thermal expansion.
Our Solution: ASTM A182 F22/F91 alloy flanges offering high creep rupture strength and structural stability for high-stress steam loops and nuclear cooling lines.
Chemical & Petrochemical Processing
The Challenge: Dynamic fluid stress and aggressive media (Sulfuric, Nitric, Hydrochloric acids).
Our Solution: Dual-certified Stainless Steel and Duplex F51/F53 flanges, solution-annealed to resist pitting, crevice corrosion, and intergranular attacks.
Water Treatment & Desalination
The Challenge: Severe chloride pitting and galvanic corrosion from high-velocity seawater.
Our Solution: Super Duplex F53 and corrosion-resistant coated flanges tailored for high-pressure Reverse Osmosis (RO) systems, ensuring a 25+ year lifespan.
OEM & Custom Engineered Solutions
Tailored Configurations
Custom hub lengths, specialized reduction flanges, and custom target faces built to your exact CAD/Blueprints.
Cladding & Weld Overlay
Special corrosion-resistant alloy overlays (e.g., Inconel 625, Monel 400) welded onto carbon steel bodies to save costs while maintaining high corrosion resistance.
Co-Engineering Support
Our engineers review your technical data sheets to optimize designs for weight savings and cost efficiency without sacrificing structural margins.
Engineering & Technical Support
Zero-Error Drawing Reviews (24-Hour Turnaround)
Submit your CAD, STEP, or PDF blueprints. We cross-verify dimensional tolerances and bolt-hole alignments to eliminate costly on-site modification delays.
Metallurgical Risk Mitigation
Facing hydrogen embrittlement, stress cracking, or high temperatures? Our engineers match the exact flange material (from Carbon to Super Duplex) to your specific pressure, temperature, and chemical media parameters.
Design Optimization for Cost Savings
Through Design-for-Manufacturability (DFM) reviews, we help refine custom flange profiles and wall thicknesses—reducing raw material weight and lowering your purchasing costs without compromising structural safety.
Factory Strength
|
Capability |
Specification |
|
Manufacturing Facility |
35,000 m² |
|
Annual Flange Capacity |
20,000 Tons |
|
Steel Processing Capacity |
30,000 Tons |
|
Export Markets |
20+ Countries |
|
Product Size |
1/2"–60" |
|
Standards |
ASME, EN, DIN, JIS |
|
Inspection |
PMI, UT, MPI, PT |
Packaging
We ensure 100% surface integrity from our factory floor to your project site. Our heavy-duty ocean freight packaging eliminates rust and logistical delays.
Multi-Layer Anti-Rust Protection: Every flange is treated with a light anti-rust oil, black paint, or yellow varnish coating. All critical sealing faces (RF, FF, RTJ) are securely capped with heavy-duty plastic protectors to prevent scratches during transit.
Zero-Fumigation Ocean Cases: We pack exclusively in ISPM-15 compliant, heavy-duty plywood cases or pallets. This eliminates the need for fumigation certificates, ensuring 100% hassle-free customs clearance at US and European ports.
Frequently Asked Questions