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Published: November 10, 2025 | Updated: November 10, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence
In the specialized domain of stainless steels compliant with ASTM A240/A240M and ASME SA240/SA240M standards, 316Ti emerges as a titanium-stabilized austenitic grade whose alloy composition is pivotal for its superior high-temperature corrosion resistance and structural integrity in demanding applications.
As a premier producer and exporter based in China, Gangsteel has supplied thousands of tons of 316Ti stainless steel, meeting ASTM A240/A240M specs for plates and sheets, to industries like petrochemical, pharmaceutical, and marine.
If you're analyzing the alloy composition data for 316Ti under ASME SA240/SA240M for a heat exchanger or welded reactor where chemical tolerances are critical, understanding its elements and their roles is essential. This article provides a comprehensive breakdown of 316Ti's alloy composition, properties, and insights, based on ASTM A240/A240M and ASME SA240/SA240M standards and our mill data.
From our production lines, we've documented 316Ti's composition excellence: In a 2024 European chemical facility, our 316Ti components under ASTM A240 /A240M demonstrated stability at 600°C thanks to titanium binding, yielding a PREN of 23-28 for pitting resistance, as per client lab analysis. Compliant with ASME SA240/SA240M for pressure apps, 316Ti's density of 8.00 g/cm³ supports efficient designs. Let's delve into the composition data, from elements to performance, to equip you for informed decisions.
316Ti stainless steel (UNS S31635 or AISI 316Ti), compliant with ASTM A240/A240M and ASME SA240/SA240M, features an alloy composition of C 0.08% max, Cr 16-18%, Mo 2-3%, Ni 10-14%, Ti 0.4-0.7%, Mn 2% max, Si 0.75% max, P 0.045% max, S 0.03% max, N 0.1% max, Fe balance, with Ti for IGC resistance at 425-815°C. This yields PREN 23-28, tensile 515 MPa min, yield 205 MPa min, elongation 40% min. Density 8.00 g/cm³, thermal conductivity 14.6 W/m·K. Superior to 316L in heat, equivalent to EN 1.4571. Ideal for chemical reactors; Gangsteel stocks 1-200mm with certs.
The alloy composition of 316Ti, as per ASTM A240/A240M and ASME SA240/SA240M, is carefully balanced for stability, with titanium ensuring resistance to carbide precipitation.
|
Element |
% Range or Max |
Typical Value |
Role in Alloy |
|---|---|---|---|
|
Carbon (C) |
0.08 max |
0.05 |
Low to minimize carbides; Ti binds for high-temp stability. |
|
Manganese (Mn) |
2.00 max |
1.00 |
Deoxidizer; aids formability without affecting corrosion. |
|
Silicon (Si) |
0.75 max |
0.50 |
Enhances oxidation resistance; supports thermal properties. |
|
Phosphorus (P) |
0.045 max |
<0.030 |
Controlled to maintain ductility and pitting resistance. |
|
Sulfur (S) |
0.030 max |
<0.020 |
Limited to prevent hot shortness; trace for machinability. |
|
Chromium (Cr) |
16.00-18.00 |
17.00 |
Provides passivation; core for PREN 23-28. |
|
Molybdenum (Mo) |
2.00-3.00 |
2.50 |
Boosts pitting/crevice resistance; key for alloy strength. |
|
Nickel (Ni) |
10.00-14.00 |
12.00 |
Stabilizes austenite; enhances overall toughness. |
|
Titanium (Ti) |
5x(C+N) min, 0.70 max |
0.50 |
Stabilizer; forms TiC to prevent IGC at 425-815°C. |
|
Nitrogen (N) |
0.10 max |
0.05 |
Strength booster; controlled for clean microstructure. |
|
Iron (Fe) |
Balance |
Balance |
Base matrix for the austenitic structure. |
This composition yields a PREN of 23-28, making 316Ti suitable for chlorides and acids. Typical values from Gangsteel's melts ensure compliance with ASTM A240/A240M.
For uns stainless steel plates, this composition data is verified.
316Ti's mechanical properties, per ASTM A240/A240M and ASME SA240/SA240M, reflect its balanced composition for strength and ductility.
|
Property |
Minimum Value |
Typical Range |
Notes |
|---|---|---|---|
|
Tensile Strength (MPa) |
515 |
550-700 |
High for austenitic; stable at heat from Ti. |
|
Yield Strength (MPa) |
205 |
220-300 |
Good for deformation resistance. |
|
Elongation (%) |
40 |
45-55 |
Excellent ductility for forming. |
|
Reduction of Area (%) |
Not specified |
50-60 |
Indicates toughness. |
|
Hardness (HRB max) |
95 |
80-90 |
Soft for machining. |
|
Brinell Hardness (HB max) |
217 |
160-190 |
Converted; aids wear. |
|
Charpy Impact (J) |
Not required |
100+ at RT |
High for impact. |
The alloy's Ni/Mo/Cr contribute to these, with Ti preventing loss at heat.
Physical properties of 316Ti, compliant with ASTM A240/A240M and ASME SA240/SA240M, complement its alloy composition.
|
Property |
Value |
Notes |
|---|---|---|
|
Density (g/cm³) |
8.00 |
Standard for weight calcs. |
|
Melting Range (°C) |
1370-1400 |
High for thermal stability. |
|
Thermal Conductivity (W/m·K) |
14.6 (at 100°C) |
Good dissipation. |
|
Specific Heat (J/kg·K) |
500 |
Efficient thermal cycling. |
|
Coefficient of Thermal Expansion (10^-6 /°C) |
16.5 (20-100°C) |
Low distortion. |
|
Modulus of Elasticity (GPa) |
193 |
High stiffness. |
|
Electrical Resistivity (μΩ·cm) |
74 |
Moderate. |
These properties make 316Ti versatile for the alloy's applications.
316Ti's corrosion resistance, per ASTM A240/A240M and ASME SA240/SA240M, is enhanced by the alloy's Ti for IGC.
316Ti is highly weldable, Ti preserving properties per ASTM A240/A240M. Fillers ER316L.
Gangsteel's 316Ti SA240 Type 316Ti excels in fabrication.
316Ti's alloy composition suits chemical reactors (heat stability), marine piping (pitting resistance).
In Gangsteel's supply to U.S. pharma, the alloy endured without failure.
Equivalents: EN 1.4571 (identical composition). For A240 GR 316Ti, equivalents match.
Gangsteel stocks 316Ti at $3,200-3,800/ton FOB. 1-200mm thick, certs. Contact for alloy data.
Q: What is the chemical composition of 316Ti stainless steel?
A: The chemical composition of 316Ti (UNS S31635) includes C 0.08% max, Cr 16-18%, Mo 2-3%, Ni 10-14%, Ti 0.4-0.7%, Mn 2% max, Si 0.75% max, P 0.045% max, S 0.03% max, N 0.1% max, Fe balance, with Ti for IGC resistance at 425-815°C.
Q: What is the typical chromium content in 316Ti alloy?
A: Chromium content in 316Ti is 16.00-18.00%, providing the base for passivation and corrosion resistance, identical to 316 but enhanced by Ti/Mo for high-temp stability.
Q: How does molybdenum affect the composition of 316Ti?
A: Molybdenum in 316Ti is 2.00-3.00%, boosting pitting and crevice corrosion resistance in chlorides, contributing to its PREN of 23-28 for superior performance in marine or acidic environments.
Q: What is the role of titanium in the 316Ti alloy composition?
A: Titanium (5x(C+N) min, 0.70% max) in 316Ti binds carbon and nitrogen to form TiC/TiN, preventing chromium carbide formation at grain boundaries and ensuring IGC resistance at high temperatures.
Q: How does nickel content influence 316Ti's properties?
A: Nickel at 10.00-14.00% in 316Ti stabilizes the austenitic structure, enhancing ductility, strength, and general corrosion resistance, making it suitable for welded applications without phase changes.
Q: What is the carbon limit in the composition of 316Ti?
A: The carbon limit in 316Ti is 0.08% max, allowing for better weldability than standard 316 while relying on titanium for stabilization against sensitization during heat exposure.
Q: Are there any other elements in the 316Ti alloy composition?
A: Yes, manganese (2.00% max) for deoxidation, silicon (0.75% max) for oxidation resistance, phosphorus (0.045% max) and sulfur (0.030% max) as controlled impurities, nitrogen (0.10% max) for strength, and iron (balance) as the base matrix.
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