316Ti Flanges | ASTM A182 F316Ti / UNS S31635 / EN 1.4571
316Ti flanges are titanium-stabilized austenitic stainless steel flanges used in chemical processing, petrochemical, refinery, heat-exchanger and elevated-temperature piping systems.
The material is commonly identified as 316Ti, UNS S31635, EN 1.4571, and X6CrNiMoTi17-12-2.
For ASTM / ASME piping systems, forged flanges are supplied as A182-A182M F316Ti to dimensional standards such as ASME B16.5 and ASME B16.47.
For European piping systems, EN 1.4571 flanges can be supplied to EN 1092-1 in PN-rated configurations such as Type 11 Weld Neck, Type 05 Blind and Type 01 Plate Flanges.
316Ti / F316Ti / 1.4571 Material Overview
| Item | Designation |
|---|---|
| Common Grade | 316Ti |
| ASTM Forging Grade | ASTM A182 F316Ti |
| ASME | SA-182 F316Ti |
| UNS | S31635 |
| EN Material No. | 1.4571 |
| EN Designation | X6CrNiMoTi17-12-2 |
| Material Type | Titanium-Stabilized Austenitic Stainless Steel |
| Main Alloying Elements | Cr, Ni, Mo, Ti |
| Typical Products | Flanges, Forged Fittings, Valves, Pipe and Plate |
What Is 316Ti Stainless Steel?
316Ti is a molybdenum-alloyed austenitic stainless steel stabilized with titanium.
The titanium addition helps reduce chromium carbide precipitation during welding and prolonged elevated-temperature exposure. This improves resistance to intergranular corrosion while maintaining the general corrosion resistance associated with the 316 stainless steel family.
Key characteristics include:
- Good general corrosion resistance
- Good resistance to pitting and crevice corrosion
- Good weldability
- Good toughness
- Titanium stabilization
- Good elevated-temperature stability
- Austenitic microstructure
316Ti should not be described as universally more corrosion resistant than 316L. Its main advantage is stabilization during thermal exposure.
ASTM A182 F316Ti Chemical Composition
Typical ASTM A182 F316Ti / UNS S31635 chemistry includes:
| Element | Requirement |
|---|---|
| Carbon, C | 0.08% max |
| Manganese, Mn | 2.00% max |
| Silicon, Si | 1.00% max |
| Phosphorus, P | 0.045% max |
| Sulfur, S | 0.030% max |
| Chromium, Cr | 16.0–18.0% |
| Nickel, Ni | 10.0–14.0% |
| Molybdenum, Mo | 2.0–3.0% |
| Nitrogen, N | 0.10% max |
| Titanium, Ti | 5 × (C + N) min., 0.70% max |
| Iron, Fe | Balance |
Actual heat chemistry is reported on the Material Test Certificate.
ASTM A182 F316Ti Mechanical Properties
Typical minimum room-temperature requirements include:
| Property | Requirement |
|---|---|
| Tensile Strength | 515 MPa / 75 ksi min |
| Yield Strength | 205 MPa / 30 ksi min |
| Elongation | 30% min |
| Reduction of Area | 40% min |
Mechanical properties depend on section size and final heat-treatment condition.
ASTM A182 F316Ti Flanges
ASTM A182 F316Ti applies to forged or rolled stainless steel pressure components such as flanges, forged fittings and valve parts.
Available flange types include:
- Weld Neck Flange
- Blind Flange
- Slip-On Flange
- Socket Weld Flange
- Threaded Flange
- Lap Joint Flange
- Long Weld Neck Flange
- Reducing Flange
- Custom Forged Flange
ASME B16.5 F316Ti Flanges
ASTM A182 F316Ti forged flanges can be supplied to ASME B16.5.
Typical supply range:
| Item | Supply Range |
|---|---|
| Size | NPS 1/2″ to NPS 24″ |
| Pressure Class | 150, 300, 400, 600, 900, 1500, 2500 |
| Facing | RF, RTJ, FF where applicable |
| Material | ASTM A182 F316Ti / UNS S31635 |
Common products include:
F316Ti Weld Neck Flange
Weld Neck flanges are commonly used for pressure and temperature-critical piping where a butt-weld connection and good stress distribution are required.
Typical description:
ASTM A182 F316Ti WN Flange, NPS 6″, Class 300, RF, ASME B16.5
F316Ti Blind Flange
Blind flanges are used to close pipe ends, valves, vessel nozzles and equipment connections.
Available facings include RF and RTJ where applicable.
F316Ti Slip-On Flange
Slip-On flanges provide an economical welded flange connection where permitted by the piping specification.
F316Ti Socket Weld and Threaded Flanges
Socket Weld and Threaded flanges are commonly used in smaller-bore piping systems according to the applicable pressure class and piping specification.
ASME B16.47 Large-Diameter 316Ti Flanges
For larger diameters, 316Ti flanges may be manufactured to ASME B16.47 where applicable.
Typical configurations include:
- Series A
- Series B
- Weld Neck
- Blind
- Raised Face
- RTJ where applicable
The required standard, series, class and facing should be clearly stated in the inquiry.
EN 1.4571 Flanges
316Ti is also widely specified in European projects as:
EN 1.4571 / X6CrNiMoTi17-12-2
EN 1.4571 flanges can be supplied to EN 1092-1.
Typical configurations include:
EN 1092-1 Type 11
Weld Neck Flange
EN 1092-1 Type 05
Blind Flange
EN 1092-1 Type 01
Plate Flange
Common pressure designations include:
- PN6
- PN10
- PN16
- PN25
- PN40
- PN63
- PN100
A typical EN order description is:
EN 1.4571 Weld Neck Flange, EN 1092-1 Type 11, DN100, PN40
ASTM F316Ti vs EN 1.4571 Flanges
ASTM A182 F316Ti and EN 1.4571 belong to the same 316Ti material family, but the flange product standards and ordering systems are different.
| Item | ASTM / ASME System | EN System |
|---|---|---|
| Material | ASTM A182 F316Ti | EN 1.4571 |
| Material Name | UNS S31635 / 316Ti | X6CrNiMoTi17-12-2 |
| Flange Standard | ASME B16.5 / B16.47 | EN 1092-1 |
| Size | NPS | DN |
| Rating | Class 150–2500 | PN6–PN100+ |
| Typical Facing | RF, RTJ, FF | EN Facing Types |
| Typical Products | WN, Blind, SO, SW, Threaded | Type 11, 05, 01 |
Material correspondence does not mean the flange dimensional standards are interchangeable.
The purchase order should clearly identify the required material and flange standard.
316Ti vs 316L Flanges
| Item | 316Ti | 316L |
|---|---|---|
| UNS | S31635 | S31603 |
| EN No. | 1.4571 | 1.4404 |
| Stabilization | Titanium | Low Carbon |
| General Corrosion Resistance | Good | Good |
| Key Advantage | Thermal Stabilization | Welded Fabrication |
| Typical Application | Elevated-Temperature / Stabilized Service | General Corrosion-Resistant Piping |
316Ti is often selected where long-term elevated-temperature exposure makes stabilization important.
316L remains widely used for general welded corrosion-resistant piping systems.
Corrosion Resistance
The molybdenum content in 316Ti improves resistance to localized corrosion compared with 304-type stainless steel.
316Ti performs well in many chemical and industrial environments but is not immune to:
- Chloride pitting
- Crevice corrosion
- Chloride stress-corrosion cracking
For severe seawater or high-temperature chloride environments, duplex, super duplex or higher-alloy materials may provide a greater corrosion margin.
Typical Applications
316Ti / 1.4571 flanges are commonly used in:
- Chemical Processing
- Petrochemical Plants
- Refineries
- Heat Exchangers
- Process Piping
- Power Generation
- Pressure Equipment
- Pumps and Valves
- High-Temperature Piping Systems
Inspection and Certification
F316Ti and 1.4571 flanges can be supplied with:
- EN 10204 Type 3.1 MTC
- EN 10204 Type 3.2 when specified
- Chemical Analysis
- Mechanical Testing
- PMI
- Heat-Treatment Records
- Dimensional Inspection
- Visual Inspection
- PT
- UT where specified
- Third-Party Inspection
- Full Heat-Number Traceability
How to Order 316Ti / 1.4571 Flanges
Example#1
ASTM A182 F316Ti Weld Neck Flange, NPS 6″, Class 300, RF, ASME B16.5
Example#2
EN 1.4571 Weld Neck Flange, EN 1092-1 Type 11, DN100, PN40
Frequently Asked Questions
Is ASTM A182 F316Ti the same as EN 1.4571?
They belong to the same titanium-stabilized 316Ti stainless steel material family. However, ASTM A182 and EN material/product standards use different specification and flange-design systems.
What is UNS S31635?
UNS S31635 is the UNS designation for 316Ti stainless steel.
What is X6CrNiMoTi17-12-2?
X6CrNiMoTi17-12-2 is the EN designation associated with material number 1.4571.
What is the difference between F316Ti and 316Ti plate?
F316Ti under ASTM A182 is a forging grade for pressure components. 316Ti plate may be supplied to ASTM A240 / ASME SA-240.
Can 1.4571 flanges be supplied to EN 1092-1?
Yes. Common configurations include Type 11 Weld Neck, Type 05 Blind and Type 01 Plate Flanges.
Related 316Ti / 1.4571 Products
- ASTM A312 TP316Ti Seamless Pipe
- ASTM A403 WP316Ti Butt-Weld Fittings
- ASTM A403 WP316Ti Elbows
- ASTM A240 316Ti Stainless Steel Plate
- EN 1.4571 Stainless Steel Pipe
- EN 1.4571 Plate
- Custom 316Ti Forged Components
316Ti / EN 1.4571 Flange Manufacturer and Supplier
We manufacture and supply ASTM A182 F316Ti / UNS S31635 / EN 1.4571 stainless steel flanges for chemical, petrochemical, refinery and elevated-temperature process applications.
Available products include Weld Neck, Blind, Slip-On, Socket Weld, Threaded, Long Weld Neck and EN 1092-1 flange configurations.
For quotation, please provide the material grade, flange type, size, Class or PN rating, facing, quantity and inspection requirements.
