Grade 316Ti
Austenitic stainless · AISI 316Ti / SAE 30316Ti, UNS S31635, EN 1.4571
Type 316Ti Titanium-Stabilized Stainless Steel, austenitic stainless steel.
Data sheet
| Designations | AISI 316Ti / SAE 30316Ti · UNS S31635 · EN 1.4571 (X6CrNiMoTi17-12-2) |
|---|---|
| Standards | ASTM A240, EN 10088-2, DIN 17440 |
Metallurgy
Reference data for Type 316Ti Titanium-Stabilized Stainless Steel, against ASTM A240, EN 10088-2, DIN 17440.
Elemental composition
X6CrNiMoTi17-12-2 to 1.4571
- Chromium 17,00%16,00–18,00%
- Nickel 12,00%10,00–14,00%
- Molybdenum 2,50%2,00–3,00%
- Nitrogen 0,050%max 0,10%
- Carbon 0,040%max 0,080%
- Other additions 1,99%Ti, Mn, Si, P, S
- Iron 66,42%Balance
Proportions use the normalised midpoint of each specified range. The midpoint is a derived figure, not something the standard states: read the table for what is actually specified.
Performance profile
Comparative scores out of ten, for weighing one grade against another
These are relative ratings, not measured properties, and they carry no units. Use them to narrow a shortlist, then work from the specified values.
Composition as specified
| Element | Specified | Nominal |
|---|---|---|
| Iron Fe | Balance | 66,42% |
| Carbon C | max 0,080%cap | 0,040% |
| Chromium Cr | 16,00–18,00% | 17,00% |
| Nickel Ni | 10,00–14,00% | 12,00% |
| Molybdenum Mo | 2,00–3,00% | 2,50% |
| Titanium Ti | 0,20–0,70% | 0,45% |
| Manganese Mn | max 2,00%cap | 1,00% |
| Silicon Si | max 0,75%cap | 0,50% |
| Nitrogen N | max 0,10%cap | 0,050% |
| Phosphorus P | max 0,045%cap | 0,025% |
| Sulphur S | max 0,030%cap | 0,015% |
A cap is a ceiling, not a quantity: a heat may contain far less. The nominal column is the midpoint of each range, used for the chart's proportions only.
Mechanical and physical properties
| Property | Value |
|---|---|
| Tensile strength, ultimate | 520 MPa75,4 ksi |
| Yield strength, 0,2% offset | 215 MPa31,2 ksi |
| Elongation at break | 35% |
| Hardness | 180 HBW / 89 HRB |
| Modulus of elasticity | 195 GPa28,3 Mpsi |
| Density | 8 g/cm³0,29 lb/in³ |
| Thermal conductivity | 16,3 W/(m·K)113,1 BTU·in/(hr·ft²·°F) |
| Thermal expansion | 16,5 µm/(m·K)9,2 µin/(in·°F) |
Test condition not yet confirmed. These figures are typical values for the grade; the condition a bar was supplied in changes them materially, so ask us for the mill certificate before designing to a number.
Pitting resistance
PREN 26,05
Cr + 3,3 Mo + 16 N, across the full specified composition
- Freshwater0–20
- Brackish20–32
- Seawater32–40
- Extreme offshoreover 40
A standard states its elements as ranges, so a grade has a window rather than a single score. The bar is that window; the tick is the midpoint.
Corrosion and fabrication
Chloride and marine service
Equivalent to 316 in marine chloride pitting resistance.
Acidic and chemical media
Resistant to dilute sulfuric acid and organic acid vapors at elevated temperatures.
Sensitisation and thermal behaviour
Stabilized with Titanium: preferentially forms TiC precipitates, preventing chromium depletion at grain boundaries up to 800°C.
Welding
Good; requires Ti-stabilized or low-carbon filler wire (ER316L / ER318) to avoid weld bloom.
Machining and cold forming
Machinability index 38% relative to AISI 1212. Moderate to Good; titanium carbonitride inclusions slightly reduce polishability and fine formability.
Where it is used
- Flue gas desulfurization (FGD) scrubber liners
- High-temperature chemical processing reactors
- Exhaust system components for heavy marine diesels
- Nuclear engineering reprocessing piping
Petrochemical · Energy · Nuclear · Marine
Performance scores in full
The same six scores the profile plots, as numbers.
| Property | 316Ti |
|---|---|
| Corrosion resistance | 9 / 10 |
| Weldability | 8.7 / 10 |
| High-temperature resistance | 8.5 / 10 |
| Tensile strength | 6.5 / 10 |
| Cold formability | 8 / 10 |
| Machinability | 4 / 10 |
This page is guidance for selecting a grade, not a specification. Design to the governing standard and the mill certificate for the heat you are supplied.
The specifications and data on this site are provided for general information only. Verify any real-world project with a qualified metallurgist before relying on these figures. We take no responsibility for the use and application of this information.