ASTM A240 316Ti Stainless Steel Plate | UNS S31635 / EN 1.4571
ASTM A240 / A240M 316Ti stainless steel plate is a titanium-stabilized austenitic stainless steel plate used in chemical processing, petrochemical, heat-exchanger, pressure-equipment and elevated-temperature applications.
316Ti is identified as UNS S31635, EN 1.4571, and X6CrNiMoTi17-12-2.
The material combines chromium, nickel and molybdenum with titanium stabilization. Molybdenum improves resistance to localized corrosion, while titanium helps reduce chromium carbide precipitation during welding and prolonged elevated-temperature exposure.
ASTM A240 316Ti plate, sheet and strip can be supplied in hot-rolled and cold-rolled conditions with various thicknesses, dimensions and surface finishes.
ASTM A240 316Ti Material Overview
| Item | Designation |
|---|---|
| ASTM / ASME | ASTM A240 / ASME SA-240 |
| Grade | 316Ti |
| 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 |
| Product Forms | Plate, Sheet, Strip |
| Typical Service | Chemical, Petrochemical and Elevated-Temperature Applications |
What Is ASTM A240 316Ti?
ASTM A240 covers chromium and chromium-nickel stainless steel plate, sheet and strip for pressure vessels and general applications.
316Ti is a titanium-stabilized version of molybdenum-bearing 316 stainless steel.
Its key characteristics include:
- Good general corrosion resistance
- Good pitting and crevice-corrosion resistance
- Good weldability
- Good forming characteristics
- Good toughness
- Improved resistance to intergranular corrosion
- Good stability during prolonged elevated-temperature exposure
- Austenitic microstructure
The principal advantage of 316Ti is titanium stabilization, rather than universally higher corrosion resistance than 316L.
Why Is Titanium Added to 316Ti?
Titanium has a strong affinity for carbon and nitrogen.
By forming stable titanium compounds, it helps reduce the formation of chromium carbides at grain boundaries during welding or prolonged exposure to sensitization temperatures.
This helps preserve chromium near the grain boundaries and improves resistance to intergranular corrosion.
316Ti is therefore frequently considered for equipment exposed to:
- Welding
- Repeated thermal cycling
- Elevated-temperature operation
- Long-term thermal exposure
Chemical Composition
Typical ASTM A240 316Ti / 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 mechanical properties include:
| Property | Requirement |
|---|---|
| Tensile Strength | 515 MPa / 75 ksi min |
| Yield Strength | 205 MPa / 30 ksi min |
| Elongation | 40% min |
| Hardness | 95 HRB max |
| Density | Approx. 8.0 g/cm³ |
Mechanical properties depend on thickness and final product condition.
Corrosion Resistance
316Ti offers good resistance to many industrial and chemical environments.
General Corrosion
The chromium-nickel alloy base provides good resistance to many process fluids and atmospheric environments.
Pitting and Crevice Corrosion
The molybdenum addition improves localized corrosion resistance compared with 304-type stainless steels.
Intergranular Corrosion
Titanium stabilization helps improve resistance to intergranular corrosion after welding or thermal exposure.
Chloride Environments
316Ti can perform well in moderate chloride-containing environments, but it is not immune to pitting, crevice corrosion or chloride stress-corrosion cracking.
For severe seawater or high-temperature chloride service, duplex, super duplex or higher-alloy materials may provide a greater corrosion margin.
316Ti vs 316L
316Ti and 316L are both molybdenum-alloyed austenitic stainless steels, but they control sensitization differently.
| Item | 316Ti | 316L |
|---|---|---|
| UNS | S31635 | S31603 |
| EN No. | 1.4571 | 1.4404 |
| Stabilization | Titanium | Low Carbon |
| General Corrosion Resistance | Good | Good |
| Main Advantage | Thermal stabilization | Excellent welded fabrication performance |
| Typical Use | Elevated-temperature / stabilized service | General corrosion-resistant welded equipment |
316Ti should not automatically be considered more corrosion resistant than 316L.
Material selection should consider temperature, fabrication method and actual process environment.
International Material Designations
| Standard System | Designation |
|---|---|
| ASTM / AISI | 316Ti |
| UNS | S31635 |
| EN / W.Nr. | 1.4571 |
| EN Name | X6CrNiMoTi17-12-2 |
| JIS Comparable Grade | SUS 316Ti |
| BS Comparable Grade | 320S31 |
Grades from different national standards should be verified before substitution because chemistry and product requirements may differ.
ASTM A240 316Ti Plate Supply Range
Typical commercial supply includes:
| Item | Supply Range |
|---|---|
| Material | ASTM A240 316Ti / UNS S31635 |
| Hot-Rolled Thickness | Approx. 3–180 mm |
| Cold-Rolled Thickness | Approx. 0.5–6 mm |
| Width | 1000 / 1219 / 1500 / 1800 / 2000 mm |
| Length | Standard or Cut-to-Length |
| Surface | No.1, 2B, 2D, No.4, BA, Brushed, Polished |
| Cutting | Plasma, Laser, Waterjet, Saw Cutting |
| Certification | EN 10204 3.1 / 3.2 where specified |
Actual availability depends on thickness, width, finish and quantity.
Intergranular Corrosion Testing
Where required by the project, 316Ti plate can be supplied with intergranular corrosion testing.
A commonly specified method is:
ASTM A262 Practice E
This test evaluates susceptibility to intergranular attack in austenitic stainless steels.
Testing should be specified separately on the purchase order when required.
NACE / Sour-Service Requirements
316Ti plate may be supplied for projects that specify additional sour-service or H₂S-related material requirements.
However, standard ASTM A240 316Ti plate should not automatically be described as NACE MR0175 compliant.
Suitability depends on:
- Service environment
- Material condition
- Hardness
- Cold work
- Welding
- H₂S partial pressure
- Temperature
- Project requirements
Any NACE / ISO requirement should therefore be clearly stated during procurement.
Typical Applications
ASTM A240 316Ti plate is commonly used in:
- Chemical-processing equipment
- Petrochemical plants
- Refineries
- Heat exchangers
- Pressure vessels
- Process tanks
- Pulp and paper equipment
- Food-processing equipment
- Power-generation equipment
- High-temperature process equipment
- Pumps and valves
- General industrial fabrication
Inspection and Certification
316Ti plate can be supplied with:
- EN 10204 Type 3.1 MTC
- EN 10204 Type 3.2 when specified
- Chemical Analysis
- Mechanical Testing
- PMI
- Dimensional Inspection
- Surface Inspection
- UT where specified
- ASTM A262 Intergranular Corrosion Testing
- Third-Party Inspection
- Full Heat-Number Traceability
How to Order ASTM A240 316Ti Plate
A complete inquiry should include:
- Material specification
- Grade
- Thickness
- Width
- Length
- Surface finish
- Quantity
- Testing requirements
- Certification requirements
Example
ASTM A240 316Ti Stainless Steel Plate, 6 mm × 1500 mm × 6000 mm, No.1 Finish, 10 PCS, EN 10204 3.1
Frequently Asked Questions
What is ASTM A240 316Ti?
ASTM A240 316Ti is a titanium-stabilized molybdenum-bearing austenitic stainless steel plate, sheet and strip grade identified as UNS S31635.
What is EN 1.4571?
EN 1.4571 is the European material number for X6CrNiMoTi17-12-2, corresponding to the 316Ti stainless steel material family.
Is 316Ti more corrosion resistant than 316L?
Not universally.
Both offer similar general corrosion resistance. 316Ti uses titanium stabilization, while 316L uses low carbon to control sensitization.
What is the main advantage of 316Ti?
Its main advantage is improved stability against intergranular corrosion after prolonged elevated-temperature exposure or welding.
Can 316Ti plate be tested to ASTM A262?
Yes. Intergranular corrosion testing such as ASTM A262 Practice E can be specified when required by the project.
Related 316Ti Stainless Steel Products
In addition to ASTM A240 316Ti stainless steel plate, we also supply 316Ti piping components in UNS S31635 / EN 1.4571 for chemical, petrochemical, refinery and elevated-temperature applications.
Available 316Ti products include:
- ASTM A312 TP316Ti Seamless Pipe
- ASTM A182 F316Ti Forged Flanges
- ASTM A403 WP316Ti Butt-Weld Fittings
- ASTM A403 WP316Ti Elbows
- EN 1.4571 Stainless Steel Pipe
- EN 1.4571 Flanges
These products can be supplied with material certification, PMI, dimensional inspection and project-specific testing when required.
ASTM A240 316Ti / EN 1.4571 Stainless Steel Plate Supplier
We supply ASTM A240 316Ti / UNS S31635 / EN 1.4571 stainless steel plate, sheet and strip for chemical, petrochemical, heat-exchanger and elevated-temperature industrial applications.
Available products include:
- ASTM A240 316Ti Hot-Rolled Plate
- ASTM A240 316Ti Cold-Rolled Sheet
- UNS S31635 Stainless Steel Plate
- EN 1.4571 Plate
- X6CrNiMoTi17-12-2 Plate
- Cut-to-Size 316Ti Plate
- Custom Stainless Steel Components
For quotation, please provide the thickness, width, length, surface finish, quantity and inspection requirements.
