Large Diameter Nickel Alloy Flange
Large Diameter Nickel Alloy Flanges are engineered for critical piping systems operating under aggressive chemical environments, elevated temperatures, and extreme internal pressures.
- Product Introduction
Large Diameter Nickel Alloy Flanges Manufacturer
Certified Forged Flanges for Critical Industrial Piping Systems
Large Diameter Nickel Alloy Flanges are engineered for critical piping systems operating under aggressive chemical environments, elevated temperatures, and extreme internal pressures. Compared to standard carbon steel or stainless steel, nickel alloy flanges provide superior resistance to corrosion, oxidation, stress corrosion cracking (SCC), and creep deformation, ensuring long-term structural integrity in the world's most demanding industries.
As an ISO 9001:2015 and PED 2014/68/EU certified direct manufacturer, we supply heavy-duty, forged large diameter nickel alloy flanges in strict compliance with international standards. Backed by rigorous dimensional inspection, 100% material verification (PMI), and complete heat number traceability, our products are trusted by global EPC contractors, pipe distributors, stockists, and industrial equipment manufacturers worldwide.
Why Leading EPCs Trust Our Large Diameter Flanges
100% Genuine Forged Materials & Heavy-Duty Strength
Large diameter flanges experience tremendous mechanical stress due to increased bolt loads and pipeline weight. We utilize advanced, large-tonnage forging techniques to ensure a homogenous grain structure, delivering:
- High tensile and yield strength under extreme operational loads.
- Excellent fracture toughness and fatigue resistance.
- Maximum structural stability to prevent flange joint leakage over decades of service.
Exceptional Corrosion Resistance in Harsh Media
Our nickel-based alloys contain optimized levels of chromium, molybdenum, copper, and iron. These elements form a self-healing, stable passive oxide layer that protects the sealing face and flange body from localized pitting, crevice corrosion, and erosion in high-chloride environments, seawater, sour gas (H 2 S), and aggressive acidic solutions.
Reliable Performance at Elevated Temperatures
Depending on the specific grade, our nickel alloys retain their excellent mechanical properties and creep resistance at continuous operating temperatures ranging from 600°C up to 1000°C. This makes them indispensable for high-temperature pipelines in refineries, chemical reactors, and power plants.
Maximum Immunity to Stress Corrosion Cracking (SCC)
Conventional stainless steels often fail prematurely due to chloride-induced stress corrosion cracking. Specialized grades such as Alloy 625, Alloy C276, and Alloy 825 provide near-total immunity to SCC, making them the gold standard for offshore topsides, subsea tie-backs, desalination systems, and marine engineering.
Technical Capabilities & Precision Machining
Manufacturing oversized flanges requires specialized heavy-duty equipment and precise machining to maintain flatness, concentricity, and perfect bolt hole alignment.
Our facility utilizes advanced CNC vertical lathes and multi-axis drilling machines. Every flange undergoes rigorous post-machining inspection to guarantee that sealing faces (such as RTJ or Raised Face) meet exact tolerances, eliminating costly on-site installation delays and alignment issues.
Seamless Forged Flanges: Available up to NPS 60" / DN1500 (depending on weight and pressure class).
Custom Segmented / Welded Flanges: Available up to NPS 200" / DN5000 for low-pressure or non-standard structural applications.
Available Nickel Alloy Grades & Specifications
We manufacture large diameter flanges in a comprehensive range of high-performance alloys, fully compliant with ASTM / ASME material specifications and NACE MR0175 / ISO 15156 sour service standards:
|
Alloy Family |
Commonly Supplied Grades |
UNS Designation |
W.Nr. / EN Standard |
ASTM Forging Spec |
|
Inconel™ |
Inconel 600 Inconel 601 Inconel 625 Inconel 718 |
UNS N06600 UNS N06601 UNS N06625 UNS N07718 |
2.4816 2.4851 2.4856 2.4668 |
ASTM B564 ASTM B564 ASTM B564 ASTM B637 |
|
Incoloy™ |
Incoloy 800 Incoloy 800H Incoloy 825 |
UNS N08800 UNS N08810 UNS N08825 |
1.4876 1.4958 2.4858 |
ASTM B564 ASTM B564 ASTM B564 |
|
Hastelloy™ |
Hastelloy C22 Hastelloy C276 |
UNS N06022 UNS N10276 |
2.4602 2.4819 |
ASTM B564 ASTM B564 |
|
Monel™ |
Monel 400 Monel K500 |
UNS N04400 UNS N05500 |
2.4360 2.4375 |
ASTM B564 ASTM B564 |
|
Pure Nickel |
Nickel 200 Nickel 201 |
UNS N02200 UNS N02201 |
2.4066 2.4068 |
Dimensional & Standard Specifications
Size & Pressure Ratings
Size Range: DN15 – DN5000 (NPS 1/2" – 200")
ASME/ANSI Class: 150, 300, 400, 600, 900, 1500, 2500
EN/DIN/BS Pressure: PN6 to PN400
Standard Compliance
ASME B16.5 (Up to 24")
ASME B16.47 Series A & Series B (26" and larger / MSS SP-44)
EN 1092-1, DIN, BS, JIS
API 6A / 17D (For high-pressure oilfield and subsea applications)
Flange Types & Facing Options
Types: Weld Neck (WNF), Slip-On (SO), Blind (BL), Lap Joint, Spectacle Blind, Orifice Flange, Custom Heavy-Wall Forgings.
Facing: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G), Male & Female (M&F).
Global Applications
Our large diameter nickel alloy flanges are successfully deployed in capital-intensive, high-risk projects globally:
Offshore Production Topsides, FPSO Units, Subsea Piping, Sour Gas Processing Plants.
Acid Production Lines, Fertilizer Plants, Petrochemical Refineries.
LNG Terminals, Hydrogen Infrastructure, Biomass Gasification Plants.
Desalination Facilities, Nuclear Power Piping, Geothermal Heat Exchangers.
FAQ
Q: What international manufacturing certifications does your facility hold?
A: Our manufacturing plant is fully certified under ISO 9001:2015 and PED 2014/68/EU (Pressure Equipment Directive). This ensures our products meet the stringent statutory and compliance criteria required for European and global critical pressure systems and pressure vessels.
Q: Do you provide EN 10204 3.1 Material Test Certificates, and do you support 3.2 certification?
A: Yes, every single shipment is accompanied by a fully traceable EN 10204 3.1 MTC detailing chemical analysis, mechanical properties, hardness, and NDT test results. Furthermore, we regularly welcome and fully cooperate with international third-party inspection agencies (such as TÜV, BV, DNV, SGS, ABS) to conduct witnessed testing and issue EN 10204 3.2 Certificates based on specific project tender requirements.
Q: What is the maximum size you can forge seamlessly for Nickel 625 or C276?
A: For seamless high-pressure forged flanges (like Class 300/600/900 Weld Necks), our optimal forge capacity reaches up to NPS 60" (DN1500). For larger dimensions up to NPS 200" (DN5000), we offer custom-engineered segmented or specialized forged solutions depending on your design pressure and fluid application.
Q: Can you manufacture flanges according to proprietary project drawings?
A: Yes. A significant portion of our business involves manufacturing non-standard flanges based on customer-submitted blueprints, including custom thicknesses, unique drilling patterns, and specialized target sealing faces for pressure vessels, reactors, and heat exchangers.
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