ASTM A182 F316Ti Flanges | UNS S31635 / EN 1.4571
A182-A182M F316Ti flanges are forged austenitic stainless steel flanges manufactured from titanium-stabilized 316Ti stainless steel, identified as UNS S31635 and EN 1.4571 / X6CrNiMoTi17-12-2.
316Ti contains chromium, nickel and molybdenum together with titanium stabilization. The titanium addition helps reduce chromium carbide precipitation during welding and elevated-temperature exposure, improving resistance to intergranular corrosion.
F316Ti forged flanges are widely used in chemical processing, petrochemical plants, refineries, heat exchangers and elevated-temperature process piping.
ASTM A182 F316Ti Material Overview
| Item | Designation |
|---|---|
| ASTM / ASME | 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 |
| Structure | Austenitic |
| Typical Products | Forged Flanges, Fittings, Valve Components |
What Is ASTM A182 F316Ti?
ASTM A182 F316Ti is a forged stainless steel grade used for flanges and other pressure-containing forged components.
Key characteristics include:
- Good general corrosion resistance
- Good pitting and crevice-corrosion resistance
- Improved resistance to intergranular corrosion
- Good weldability
- Good toughness
- Good elevated-temperature stability
- Good fabrication performance
The main advantage of 316Ti is titanium stabilization rather than universally higher corrosion resistance than 316L.
Chemical Composition
Typical UNS S31635 chemistry includes:
| Element | Requirement |
|---|---|
| Carbon, C | 0.08% max |
| Manganese, Mn | 2.00% max |
| Silicon, Si | 0.75% 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.
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 | 35% min |
| Density | Approx. 8.0 g/cm³ |
Mechanical properties depend on product size and heat-treatment condition.
Corrosion Resistance
316Ti provides good resistance in many industrial and chemical environments.
Molybdenum improves resistance to pitting and crevice corrosion, while titanium stabilization helps improve resistance to intergranular corrosion after welding or prolonged thermal exposure.
316Ti can be used in moderate chloride-containing environments, but it is not immune to chloride pitting or stress-corrosion cracking.
For severe seawater or high-temperature chloride service, duplex, super duplex or higher-alloy materials may be more suitable.
ASME B16.5 F316Ti Flanges
ASTM A182 F316Ti flanges can be manufactured to ASME B16.5 dimensional requirements.
Typical 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 |
For larger diameters, ASME B16.47 flanges can be supplied where applicable.
EN 1092-1 1.4571 Flanges
EN 1.4571 flanges can also be supplied to EN 1092-1.
Typical configurations include:
- Type 11 – Weld Neck Flange
- Type 05 – Blind Flange
- Type 01 – Plate Flange
Typical pressure ratings include:
- PN6
- PN10
- PN16
- PN25
- PN40
- PN63
- PN100
The flange type, facing and PN rating should be clearly stated on the purchase order.
Forged Flange vs Plate Flange
ASTM A182 F316Ti applies to forged or rolled pressure components such as forged flanges.
Plate flanges are manufactured from plate material and may use ASTM A240 / ASME SA-240 UNS S31635 material.
Therefore, ASTM A182 F316Ti forged flanges and ASTM A240 316Ti plate flanges should be treated as different manufacturing routes.
316Ti vs 316L
316Ti and 316L are both molybdenum-alloyed austenitic stainless steels.
| Item | 316Ti | 316L |
|---|---|---|
| UNS | S31635 | S31603 |
| EN No. | 1.4571 | 1.4404 |
| Stabilization | Titanium | Low Carbon |
| Main Advantage | Thermal stabilization | Excellent welded corrosion performance |
| General Corrosion Resistance | Good | Good |
| Typical Use | Elevated-temperature / stabilized service | General welded process service |
316Ti is not automatically more corrosion resistant than 316L.
Material selection should consider temperature, fabrication method and actual service environment.
Typical Applications
ASTM A182 F316Ti flanges are commonly used in:
- Chemical-processing plants
- Petrochemical plants
- Refineries
- Heat exchangers
- Process piping
- Power-generation systems
- Pressure vessels
- Pumps and valves
- Elevated-temperature industrial equipment
Inspection and Certification
F316Ti 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 ASTM A182 F316Ti Flanges
Example 1
ASTM A182 F316Ti Weld Neck Flange, NPS 6″, Class 300, RF, ASME B16.5
Example 2
ASTM A182 F316Ti Blind Flange, NPS 8″, Class 600, RTJ, ASME B16.5
Example 3
EN 1.4571 Weld Neck Flange, EN 1092-1 Type 11, DN100, PN40
Frequently Asked Questions
What is ASTM A182 F316Ti?
ASTM A182 F316Ti is a titanium-stabilized austenitic stainless steel forging grade used for flanges and related pressure components.
What is UNS S31635?
UNS S31635 is the UNS designation for 316Ti stainless steel.
What is EN 1.4571?
EN 1.4571 is the European material number for X6CrNiMoTi17-12-2.
Is 316Ti better than 316L?
Not universally. 316Ti offers titanium stabilization for certain welded and elevated-temperature applications, while 316L uses low carbon to reduce sensitization.
ASTM A182 F316Ti Flange WNRF
ASTM A182 F316Ti / 1.4571 Flanges Manuafacturer and Supplier
We manufacture and supply ASTM A182 F316Ti / UNS S31635 / EN 1.4571 stainless steel flanges for chemical, petrochemical, refinery and process applications.
Available products include:
- F316Ti Weld Neck Flange
- F316Ti Blind Flange
- F316Ti Slip-On Flange
- F316Ti Socket Weld Flange
- F316Ti Threaded Flange
- F316Ti Long Weld Neck Flange
- EN 1.4571 Type 11 Weld Neck Flange
- EN 1.4571 Type 05 Blind Flange
- EN 1.4571 Type 01 Plate Flange
For quotation, please provide the flange type, size, pressure rating, facing, quantity and inspection requirements.
