Forged Titanium Flanges Manufacturer: ASTM B381 / ASME B16.5
Engineered for extreme pressure and terminal corrosion resistance. We manufacture precision-machined titanium flanges from Class 150 to 2500, ensuring every bolted connection exceeds the safety requirements of mission-critical piping systems.
- 100% Forged (No Casting)
- ASME B16.5 / EN 1092 / DIN
- Gr2 / Gr5 / Gr7 / Gr12
- RF / FF / RTJ CNC Machined
- PMI / MTC / NDT Support
Forged Strength. Absolute Precision.
In a high-pressure line, the flange face is the ultimate battleground for leak prevention.
A flange is more than a connection point — it is the pressure boundary that determines whether your system remains sealed, aligned, and structurally safe over years of service.
At Hele Titanium, we combine ASTM B381 forging integrity with CNC-controlled metrology so that every bolt-hole aligns, every sealing face seats correctly, and every flange arrives ready for installation. Whether your project runs high-velocity seawater, aggressive chemical media, or cyclic pressure service, our forged titanium flanges are engineered to defend uptime where failure is most expensive.
Titanium Flange Series: The Backbone of Your Piping System
Selecting the right flange type is critical for pressure retention, gasket sealing, fatigue resistance, and maintenance efficiency. From reinforced weld neck geometry to cost-saving lap joint systems, our forged titanium flanges are engineered for standards-based performance and long-life reliability.
Critical & High-Pressure Series
Weld Neck Flange (WN)
ASME B16.5 | Class 150–2500 | RF & RTJ
Best for Class 600+ piping and critical high-temperature lines
Tapered hub distributes stress into the pipe wall for superior fatigue resistance and RTJ/RF sealing stability under extreme loads.
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Blind Flange (BL)
1/2"–60" | Solid Forged Disc | Class 150–2500
Best for vessel closures and pressure-boundary terminations
Solid forged structure withstands full system pressure and hydrostatic testing at vessel nozzles, manways, and future expansion points.
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Socket Weld Flange (SW)
1/2"–4" | Sch-Matched Bore | Internal Fillet
Best for small-bore, high-pressure systems with tight clearances
Direct pipe insertion improves alignment and simplifies installation in compact instrumentation, hydraulic service, and high-vibration lines.
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Threaded Flange (TH)
NPT / BSPT | Class 150–600 | Gr2 & Gr5
Best for hazardous no-weld zones and explosive environments
Threaded connection supports secure, fast installation in gas lines, utility systems, and low-pressure applications without onsite welding.
Request a QuoteGeneral Utility & Custom Solutions
Slip-On Flange (SO)
Double Fillet Weld | ASME B16.5 | Gr2 & Gr7
Best for Class 150/300 low-pressure utility and cooling-water lines
Slip-over installation simplifies bolt-hole alignment and reduces fabrication time for flat-face (FF) and raised-face (RF) utility flanges.
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Lap Joint Flange (LJ)
Stub End + Rotating Ring | Steel or Ti Backing
Best for large-diameter corrosive infrastructure and frequent dismantling
Keeps titanium only at the wetted surface while reducing total material cost for large piping systems requiring frequent inspection.
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Pressure Vessel Flange
ASME B16.47 / Custom | Large OD >24"
Best for large-OD vessel closures and heat-exchanger connections
Heavy-duty forged construction supports high-capacity vessel manways, tank flanges, and exchanger body closures built to ASME Section VIII.
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Custom / Spectacle Blinds
Orifice Flanges | Figure-8 Blinds | Long WN
Best for absolute line isolation, flow metering, and custom faces
Precision-machined to your drawings for maintenance isolation, orifice metering points, and specialized RTJ/FF flange assemblies.
Request a QuoteChoose Titanium Flanges by Function & Sealing Demand
Quickly identify the most suitable flange solution based on pressure class, piping method, sealing face, maintenance logic, and project geometry.
High Pressure
Weld Neck / RTJBest for Class 600+ service, cyclic loading, and severe process conditions requiring maximum joint reliability.
Line Closure
Blind FlangeBest for pressure-boundary terminations, manways, vessel closures, and future tie-in points.
Compact Install
Socket / ThreadedBest for small-bore, instrumentation, and no-weld-zone installations where space and speed matter.
Utility & Economy
Slip-On / Lap JointBest for lower-pressure systems and large-diameter corrosive lines where installation efficiency and budget matter.
Custom Geometry
PCD / Orifice / SpecialBest for legacy equipment, project-specific bolt circles, large rings, and precision flow-control requirements.
Need help selecting the right flange type, facing finish, bolt circle, or titanium grade?
CNC Precision: The Science of a Zero-Leak Seal
A flange is only as reliable as its sealing face.
Even microscopic deviations in face flatness, surface roughness, or bolt-circle alignment can lead to gasket failure, leakage, and costly shutdowns. We machine every titanium flange on precision CNC equipment to exact sealing and dimensional targets so your gasket seats correctly under real operating pressure.
Face Machining & Ra Control
- RF / FF / RTJ facing with phonographic grooving
- Strict Ra (Roughness Average) control for specific gaskets
- Optimized face flatness for high-pressure seating
Bolt Circle & Custom Drilling
- Precision PCD and bolt-hole alignment
- Custom orifice taps and instrument ports
- Legacy-equipment and special-project matching
Traceability & Surface Finishing
- Acid pickling and clean surface preparation
- Permanent laser engraving with heat number and size
- 100% PMI-linked identification support
Precision Geometry. Zero-Leak Performance. Ready for Install.
Quality Control: Forged Integrity, Verified Safety
In flange service, minor errors in forging soundness, face flatness, or bolt-hole position can become major sealing failures. Our QC system is built to stop those risks before shipment.
1. Forging & Grain Refinement
- Action: Billet heating, multi-directional forging, controlled forging ratio
- Goal: Eliminate voids and refine grain flow through the flange body
- Supports high fatigue resistance and pressure-duty integrity
2. Thermal Stress Relief
- Action: Solution annealing and hardness verification
- Goal: Restore ductility and remove internal forging stress
- Ensures stable machining behavior and long-term service reliability
3. CNC Metrology & Flatness
- Action: CMM verification, precision turning, flatness and thickness control
- Goal: Guarantee bolt-hole alignment and parallel sealing faces
- Prevents installation mismatch and gasket seating failure
4. Metallurgical Verification (PMI)
- Action: 100% PMI plus tensile / yield verification where required
- Goal: Prevent alloy mix-up between Gr2, Gr7, Gr12, and Gr5
- Supports full heat-lot traceability and MTC confidence
5. Surface Integrity & Pressure Check
- Action: Sealing-face inspection, serration verification, optional hydro / NDT
- Goal: Confirm the face geometry and structural soundness needed for service
- Reduces leakage risk in high-value industrial systems
Total Traceability. Zero Defects. The Hele Guarantee.
- ASTM B381 forging basis
- EN 10204 3.1 MTC support
- 100% PMI and heat-number traceability
- UT / PT / hydro support for critical applications
- Laser marking and documentation available with shipment
Connecting Critical Infrastructure: Proven Field Performance
Titanium flanges are the pressure-boundary links in the world’s harshest piping systems. From corrosive reactor nozzles to offshore seawater manifolds, our forged connections provide the structural density, sealing precision, and corrosion immunity required to keep fluids contained and plants operational.
Chemical & Petrochemical Processing
Flange Focus: Grade 7 Nozzle & Reactor Flanges
Challenge: Hot reducing acids attack conventional alloys at the flange face and crevice zones.
Solution: Forged Grade 7 flanges resist crevice attack and maintain sealing reliability in corrosive chemical service.
Service Condition: Acid injection lines, reactor nozzles, chemical transfer systems.
Offshore Oil & Gas Systems
Flange Focus: Grade 2 / Grade 12 WN & BL Flanges
Challenge: Seawater exposure, weight sensitivity, and long maintenance intervals stress offshore systems.
Solution: Forged titanium flanges provide corrosion-proof service life while reducing system weight versus duplex alternatives.
Service Condition: Fire water systems, subsea risers, topside manifolds.
Power Generation & Desalination
Flange Focus: Large-Diameter LJ & Vessel Flanges
Challenge: Large-bore corrosive systems require titanium wetted surfaces without uncontrolled project cost.
Solution: Lap-joint and vessel-flange strategies optimize titanium use while preserving long-life corrosion resistance.
Service Condition: Seawater intake lines, condenser systems, desalination infrastructure.
Aerospace & High-Pressure Testing
Flange Focus: Grade 5 High-Strength Flanges
Challenge: Extreme tensile loads, vibration, and cyclic pressure demand lightweight yet highly reliable joints.
Solution: Precision-forged Grade 5 flanges support high-stress sealing systems in aerospace and testing hardware.
Service Condition: Fuel systems, pressure test rigs, lightweight assemblies.
Reliability under pressure starts with forged integrity and precision sealing.
Why Partner with Hele Titanium for Your Flange Requirements?
Do not compromise your pressure boundary with uncertain raw material, incomplete traceability, or poorly machined sealing faces. As a direct manufacturer with integrated forging and CNC capability, we control the process from billet to final flange.
100% In-House Forging
Forged directly from solid titanium billets in our own facility, eliminating porosity risks and guaranteeing a dense, high-integrity grain structure for critical pressure boundaries.
CNC Face & PCD Machining
Precision CNC turning and milling ensures exact Pitch Circle Diameters (PCD) and flawless sealing face finishes (RF, FF, RTJ) held to strict ASME B16.5/B16.47 tolerances.
Full Heat-Lot Traceability
Every flange is permanently laser-marked with its heat number, backed by comprehensive EN 10204 3.1 certification linking the final geometry directly to the original titanium ingot.
Custom Orifice / Special Bolt Circle Support
Beyond catalog standards. We engineer and machine custom orifice taps, non-standard bolt-hole patterns, and specialized blind flanges tailored to your exact piping configurations.
MRO Fast-Track Availability
Rapid response for plant turnarounds. We maintain strategic stock of standard ASME titanium blanks ready for expedited final machining to support your time-sensitive maintenance.
UT / PT / PMI / Hydro Support
Certified Non-Destructive Testing (NDT) capabilities including Ultrasonic Testing (UT), Penetrant Testing (PT), Positive Material Identification (PMI), and custom pressure verification.
Secure your connections with certified forging integrity.
Frequently Asked Questions
Find quick answers about flange selection, sealing-face design, gasket compatibility, forging standards, and installation-critical precautions.
Selection & Design
Slip-On vs. Weld Neck: which should I choose?
What is a Lap Joint Flange used for?
When should I specify RTJ instead of RF?
How do I choose between Gr2, Gr7, Gr12, and Gr5 for flanges?
Installation & Compliance
Do I need special gaskets for titanium flanges?
How do I prevent thread galling during flange assembly?
Why is ASTM B381 the standard for flanges instead of ASTM B265?
What documents do you provide with shipment?
Inside Our Manufacturing & Quality System
See how we produce, inspect, and document titanium products as a direct manufacturing partner.
See how forged titanium flanges move from billet heating and forging through heat treatment, CNC facing, and final release.
Billet Heating & Forging
Forged Ring / Blank Preparation
CNC Facing & Bolt Drilling
Final Release & Packing
A look inside the production areas where titanium flanges are forged, machined, inspected, and prepared for shipment.
Forging Area
CNC Machining Station
Dimensional Inspection Zone
Packing & Dispatch Area
Our inspection system verifies forging density, flatness, bolt-circle accuracy, face finish, and material identity before shipment.
PMI Material Verification
CMM / Flatness Check
Face Finish Inspection
Final Dimensional Audit
Documentation and traceability are essential for EPC sourcing, pressure-duty compliance, and critical industrial maintenance.
Mill Test Certificate Example
Dimensional Inspection Report
PMI / NDT Record
Export & Traceability Documentation
Need production photos, inspection records, or documentation support? Contact our team for direct factory assistance.
The Definitive Guide to Titanium Flanges (Manufacturer’s Expert Edition)
A titanium flange is not just a ring with holes. It is the pressure boundary and sealing interface that determines whether your piping system remains safe under thermal cycling, chemical attack, and bolted load. This guide helps engineers and procurement teams specify forged titanium flanges that are structurally sound, standards-compliant, and optimized for long-life service.
Before You RFQ Titanium Flanges, Confirm These 3 Things
- Which flange type best matches your pressure duty and installation logic: WN, SO, BL, SW, LJ, or custom?
- Which face design and finish are required: RF, FF, RTJ, stock finish, or smoother special finish?
- Does your service environment require Grade 2, Grade 7, Grade 12, or Grade 5 based on corrosion, heat, and strength?
1. Quality Metrics: What Defines a High-Quality Flange?
Quality in a titanium flange extends far beyond basic dimensional compliance. It is determined by the forging ratio, which ensures a dense, directional grain flow that resists fatigue. Furthermore, precise face flatness, accurate bolt-hole metrology, and traceable metallurgy (verified by PMI and MTCs) are non-negotiable metrics for pressure-duty confidence.
2. Forging vs. Casting: The Hidden Risk
Unlike steel, cast titanium is highly susceptible to internal shrinkage voids and coarse grain structures. Forged titanium (ASTM B381) undergoes severe plastic deformation, refining the microstructure and aligning the grain flow with the flange's contour. This is why forged flanges are mandatory for critical pressure boundaries.
| Feature | Forged Titanium Flange (ASTM B381) | Cast Titanium Flange |
|---|---|---|
| Grain Structure | Refined, directional, dense | Coarse, random |
| Fatigue Strength | Excellent under cyclic loads | Lower, prone to cracking |
| Internal Integrity | Free of voids/porosity | High risk of internal shrinkage voids |
| Pressure Confidence | High (Code compliant) | Low (Requires heavy NDT) |
3. Titanium vs. Super Duplex & Nickel Alloys
| Metric | Titanium Grade 2 | Super Duplex 2507 | Hastelloy C276 |
|---|---|---|---|
| Corrosion Resistance | Immune to chlorides/seawater | High, but susceptible to pitting | Excellent in severe acids |
| Weight Ratio | Light (~4.5 g/cm³) | Heavy (~7.8 g/cm³) | Very Heavy (~8.9 g/cm³) |
| Relative TCO | Lowest (Zero maintenance) | Medium (Replacement risk) | Highest (Material cost) |
4. Flange Types & Engineering Logic
Selecting the correct flange type is an engineering decision based on pressure, space, and budget.
WN Weld Neck
Best for severe conditions. The long tapered hub provides gradual stress transfer from flange to pipe. Mandatory for high pressure, sub-zero, or elevated temperatures.
SO Slip-On
Slips over the pipe, requiring two fillet welds. Lower initial cost but lower fatigue strength (approx 1/3 of WN). Ideal for low-pressure, non-critical services.
LJ Lap Joint
Used with a titanium stub end. The flange itself is loose, allowing easy bolt alignment. Extremely cost-effective for large lines, as the backing flange can be carbon steel.
BL Blind
Solid disk used to blank off pipelines or vessels. Subjected to high bending stresses, making titanium's high strength-to-weight ratio highly advantageous.
5. Facing Types: RF, FF, RTJ
The face is the sealing battlefield. Choosing the wrong face can lead to gasket failure or damage to mating equipment.
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RFRaised Face
The industrial standard. Concentrates the bolt load onto a smaller gasket area, increasing sealing pressure. Standard finish is typically 125-250 µin Ra to grip the gasket securely.
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FFFlat Face
The mating face has no raised area. Essential when bolting to cast iron, fiberglass (FRP), or plastic flanges to prevent bending and cracking the brittle mating flange during torquing.
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RTJRing-Type Joint
Features a precision-machined groove for a metal ring gasket. Reserved for extreme high-pressure (Class 600+) and high-temperature services where a standard sheet gasket would blow out.
6. Engineering Tools: Dimensions & Weight
Standard flanges follow ASME B16.5 up to 24 inches. For large diameter applications (>24"), ASME B16.47 Series A or B dictates dimensions. Titanium's low density (nearly half of steel) significantly alters weight calculations, reducing pipe support requirements and easing installation handling for EPC contractors.
7. Grade Selection Strategy by Service Medium
| Titanium Grade | Service Medium & Application |
|---|---|
| Grade 2 (Unalloyed) | The industrial workhorse. Excellent for seawater, brackish water, wet chlorine, and mild oxidizing acids up to 300°C. |
| Grade 7 (Ti-0.15Pd) | Contains Palladium. The ultimate choice for hot reducing acids (HCl, H2SO4) and environments highly prone to crevice corrosion. |
| Grade 12 (Ti-0.3Mo-0.8Ni) | Offers a sweet spot of higher temperature resistance and strength. Often used in heat exchangers and chemical processing. |
| Grade 5 (Ti-6Al-4V) | High strength alloy used where mechanical load, rather than extreme corrosion, is the primary challenge (aerospace, subsea equipment). |
8. Manufacturer’s Pre-Order Checklist
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Confirm pipe schedule for bore match. Crucial for WN and SW flanges. A mismatch creates an internal step, leading to flow turbulence, erosion-corrosion, and stress concentration at the weld joint.
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Confirm facing type & surface roughness (Ra). Ensure the finish matches your gasket requirements (e.g., 125-250 µin for standard spiral wound gaskets).
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Verify ASTM B381 Forging. Confirm material is forged, not cut from plate (ASTM B265), to guarantee directional strength and prevent delamination.
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Demand 3.1 MTC & PMI. Ensure full traceability of chemistry and mechanical properties before installation.
9. Field Guide: Torque, Gaskets & Bolting
Titanium flanges must be paired with the right gasket. For RF flanges, spiral wound gaskets (with graphite or PTFE filler) are standard. Avoid gaskets containing leachable chlorides or those that might induce galvanic corrosion.
Critical Warning: Anti-Galling & Bolting
Titanium’s passive oxide layer makes its threads highly susceptible to galling (cold welding) under load. Never assemble titanium bolting dry. Always apply a high-quality, metal-free anti-seize compound (like molybdenum disulfide) or use PTFE tape. Alternatively, consider using dissimilar metal bolting (e.g., Stainless Steel or Monel) coupled with insulating sleeve and washer kits to prevent galvanic corrosion in wet environments.
10. Red Flags: 3 Common Specifying Mistakes to Avoid
- Plate-Cut vs. Forged: Accepting flanges cut from ASTM B265 plate instead of forged B381. Plate lacks the required directional strength and is prone to lamellar tearing.
- Wrong Face Finish: Specifying a generic finish that doesn't match the gasket type (e.g., a smooth finish for a spiral wound gasket that needs a serrated grip).
- Grade Confusion: Specifying Grade 2 for hot reducing acids where crevice corrosion will rapidly occur, instead of upgrading to Grade 7 or 12.
Ready to Secure Your Piping Infrastructure?
From standard ASME stock to custom-forged large-diameter rings, Hele Titanium delivers the metallurgical certainty, face precision, and traceable documentation your system demands.
Room 1206, Building 1, Huaxia Yue World
Get Your Titanium Flange Solution
Tell us your flange type, pressure class, facing type, titanium grade, standard, size, bolt-circle requirement, and application environment. Our engineering team will recommend the most suitable forged titanium flange solution for your system.
- 100% Forged Flange Manufacturing
- CNC-Faced Sealing Precision
- Traceability, PMI & MTC Support
Direct Contact:
sales@heletitanium.com
Room 1206, Building 1, Huaxia Yue World
