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Published: November 12, 2025 | Updated: November 12, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence
In the precision domain of stainless steels compliant with ASTM A240/A240M and ASME SA240/SA240M standards, 316Ti stainless steel, also known as SS 316Ti under Swedish SS 2350 and equivalent to DIN 1.4571 (X6CrNiMoTi17-12-2), is a titanium-stabilized austenitic grade whose chemical composition is finely tuned for superior intergranular corrosion (IGC) resistance and high-temperature stability.
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 seeking the chemical composition of 316Ti stainless steel or SS 316Ti under ASME SA240/SA240M for a welded reactor or heat exchanger where alloy balance and performance are key, understanding its elements and roles is essential. This article provides a comprehensive overview of the chemical composition of 316Ti stainless steel and SS 316Ti, properties, and insights, based on ASTM A240/A240M and ASME SA240/SA240M standards and our mill data.
From our production lines, we've optimized the chemical composition of 316Ti stainless steel and SS 316Ti: In a 2024 Swedish chemical project, our 316Ti plates under ASTM A240/A240M with SS 2350 equivalence passed A262 Practice E with zero IGC at 650°C, ensuring full compliance for non-toxic safe use, as per client metallographic analysis. Compliant with ASME SA240/SA240M for pressure apps, 316Ti's density of 8.00 g/cm³ supports precise designs. Let's delve into the chemical composition, from elements to benefits, to guide your material selection.
The chemical composition of 316Ti stainless steel and SS 316Ti under ASTM A240/A240M and ASME SA240/SA240M features C 0.08% max, Cr 16-18%, Mo 2-3%, Ni 10-14%, Ti 0.70% max for stabilization, with density 8.00 g/cm³ and PREN 23-28 for pitting resistance. Equivalent to DIN 1.4571; superior to 316L in welded high-temp. Ideal for chemical reactors; Gangsteel stocks 1-200mm with certs for custom needs. Contact admin@gangsteel.com for quotes.
The chemical composition of 316Ti stainless steel and SS 316Ti, as per ASTM A240/A240M and ASME SA240/SA240M, is carefully balanced for stability, with titanium ensuring resistance to carbide precipitation. This composition defines its identity as a molybdenum-bearing austenitic grade with enhanced high-temp properties.
|
Element |
% Range or Max |
Typical Value |
Role in Chemical Composition |
|---|---|---|---|
|
Carbon (C) |
0.08 max |
0.05 |
Low to minimize carbides; Ti binds for IGC-free microstructure. |
|
Manganese (Mn) |
2.00 max |
1.00 |
Deoxidizer aiding toughness 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 chemical durability. |
|
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 and SS 316Ti suitable for chlorides and acids. Gangsteel's AOD refining achieves purer melts, with composition variations <5%, ensuring consistent performance.
For uns stainless steel plates, Gangsteel offers verified composition.
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 composition'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, support its chemical composition in applications.
|
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 in thermal cycling. |
|
Coefficient of Thermal Expansion (10^-6 /°C) |
16.5 (20-100°C) |
Low to minimize distortion. |
|
Modulus of Elasticity (GPa) |
193 |
High stiffness for vibration resistance. |
|
Electrical Resistivity (μΩ·cm) |
74 |
Moderate for non-electrical apps. |
These make 316Ti versatile from -196°C (cryogenic) to 815°C (elevated), with density key for buoyancy in marine designs.
Gangsteel's 316Ti is available in A240 GR 316Ti for custom cuts.
316Ti's corrosion resistance is defined by its composition, with Ti preventing carbide precipitation (sensitization) at 425-815°C, avoiding IGC that plagues standard 316 after welding or prolonged heat. Molybdenum (2-3%) gives a PREN of 23-28, excelling against pitting in chlorides (e.g., seawater, CPT ~25°C) and crevice corrosion better than 304 (PREN 18-20).
Uniform corrosion rate is <0.1 mm/year in dilute acids like H2SO4 or HNO3 at room temp; stable in boiling acetic acid. SCC resistance is good in chlorides up to 1000 ppm at 100°C; better than 304 in boiling MgCl2. Pitting/crevice CPT is 25-35°C in 6% FeCl3; suitable for marine but use 904L for severe.
High-temp stability is no sensitization after 1000 hours at 600°C; ideal for exhausts. Weldability is excellent: Use ER316L or E316LT filler, no preheat for thin sections. Ti eliminates need for post-weld annealing in most cases. Machinability is fair (60% of carbon steel), and formability is excellent with elongation >40%.
Gangsteel's 316Ti stock is ideal for uns stainless steel plates, with enhanced corrosion properties.
316Ti's composition makes it versatile for high-temp and corrosive settings:
In a 2023 Gangsteel supply to a U.S. pharmaceutical plant, 316Ti tubes handled sterilizing steam at 150°C without corrosion for 2 years, outperforming 316L. It's not for ultra-corrosive like 904L, but excels where heat is a factor.
316Ti's equivalents include UNS S31635, EN 1.4571, and JIS SUS316Ti, all with Ti stabilization. Gangsteel offers dual-cert stock for easy swaps.
Gangsteel stocks 316Ti plates (1-200mm thick) at $3,200-3,800/ton FOB, with ASME SA240 certs. MOQ 1 ton; lead 7-30 days. Custom equivalents available. Email: admin@gangsteel.com
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: How does chromium content affect 316Ti composition?
A: Chromium content (16-18%) in 316Ti provides the passive oxide layer for corrosion resistance, contributing to PREN 23-28 and enabling use in acids and chlorides.
Q: What role does molybdenum play in 316Ti chemical composition?
A: Molybdenum (2-3%) in 316Ti boosts pitting and crevice corrosion resistance, increasing CPT to 25-35°C and enhancing PREN for marine and chemical apps.
Q: Why is titanium important in 316Ti composition?
A: Titanium (min 5x(C+N), 0.70% max) in 316Ti binds carbon/nitrogen to form TiC/TiN, preventing chromium carbide and IGC at high temps, allowing welding without PWHT.
Q: How does nickel content influence 316Ti properties?
A: Nickel (10-14%) in 316Ti stabilizes the austenitic phase for ductility and strength, improving reducing acid resistance and preventing ferrite formation.
Q: What is the carbon limit in 316Ti composition?
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 316Ti chemical 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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