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Published: November 11, 2025 | Updated: November 11, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence
In the global stainless steel market compliant with ASTM A240/A240M and ASME SA240/SA240M standards, the UNS S31635 number is the unique identifier for 316Ti, a titanium-stabilized austenitic grade known for its high-temperature stability and corrosion resistance.
As a premier producer and exporter based in China, Gangsteel has supplied thousands of tons of 316Ti (UNS S31635) stainless steel, meeting ASTM A240/A240M specs for plates and sheets, to industries like petrochemical, pharmaceutical, and marine.
If you're referencing the UNS S31635 number for 316Ti under ASME SA240/SA240M for material traceability in a welded structure or pressure vessel, understanding its origin and properties is key. This article explores the UNS S31635 number for 316Ti, its meaning, properties, and practical insights, based on ASTM A240/A240M and ASME SA240/SA240M standards and our mill data.
From our production lines, we've seen the UNS S31635 number in action: In a 2024 UK chemical project, our 316Ti plates (UNS S31635) under ASTM A240 /A240M matched EN 1.4301 materials for traceability, allowing direct substitution without re-certification, saving 15% on compliance as per client reports. Compliant with ASME SA240/SA240M for pressure apps, 316Ti's density of 8.00 g/cm³ supports equivalent designs. Let's delve into the UNS S31635 number, from definition to applications, to guide your understanding.
The UNS S31635 number is the Unified Numbering System designation for 316Ti stainless steel, a titanium-stabilized variant of 316 with composition C 0.08% max, Cr 16-18%, Mo 2-3%, Ni 10-14%, Ti 0.70% max, tensile 515 MPa min, yield 205 MPa min, elongation 40% min, and density 8.00 g/cm³. It ensures global traceability under ASTM A240/A240M, with PREN 23-28 for pitting resistance. Equivalent to EN 1.4571; superior to 316L in heat. Ideal for chemical reactors; Gangsteel stocks 1-200mm with UNS S31635 certs.
The UNS S31635 number is part of the Unified Numbering System (UNS) for metals, administered by ASTM and SAE, where:
Origin: Assigned to distinguish 316Ti from 316 (S31600) and 316L (S31603), highlighting Ti's role in preventing IGC. Global Use: UNS S31635 is referenced in ASTM A240/A240M for plates and ASME SA240/SA240M for pressure vessels, ensuring consistent material identification.
Gangsteel's 316Ti stock is certified UNS S31635, with dual EN 1.4571 for European compliance.
For uns stainless steel plates, UNS S31635 verified.
The chemical composition for UNS S31635 (316Ti), as per ASTM A240/A240M and ASME SA240/SA240M, is tightly controlled for stabilization.
|
Element |
% Range or Max |
Role in UNS S31635 |
|---|---|---|
|
Carbon (C) |
0.08 max |
Low for ductility; Ti binds excess. |
|
Manganese (Mn) |
2.00 max |
Deoxidizer. |
|
Silicon (Si) |
0.75 max |
Oxidation aid. |
|
Phosphorus (P) |
0.045 max |
Impurity limit. |
|
Sulfur (S) |
0.030 max |
Machinability trace. |
|
Chromium (Cr) |
16.00-18.00 |
Passivation base. |
|
Molybdenum (Mo) |
2.00-3.00 |
Pitting enhancer. |
|
Nickel (Ni) |
10.00-14.00 |
Austenite stabilizer. |
|
Titanium (Ti) |
5x(C+N) min, 0.70 max |
Stabilization key. |
|
Nitrogen (N) |
0.10 max |
Strength booster. |
|
Iron (Fe) |
Balance |
Matrix. |
UNS S31635 requires heat analysis certs; Gangsteel's exceed with low P/S.
UNS S31635 (316Ti) mechanical properties, per ASTM A240/A240M and ASME SA240/SA240M, are robust.
|
Property |
Minimum Value |
Typical Range |
Notes |
|---|---|---|---|
|
Tensile Strength (MPa) |
515 |
550-700 |
High for load. |
|
Yield Strength (MPa) |
205 |
220-300 |
Good resistance. |
|
Elongation (%) |
40 |
45-55 |
Ductile. |
|
Hardness (HRB max) |
95 |
80-90 |
Soft. |
|
Impact (Charpy J) |
Not req. |
100+ at RT |
Tough. |
High-temp retention due to Ti.
Physical properties of UNS S31635 (316Ti), compliant with ASTM A240/A240M and ASME SA240/SA240M, aid design.
|
Property |
Value |
Notes |
|---|---|---|
|
Density (g/cm³) |
8.00 |
Standard. |
|
Melting Range (°C) |
1370-1400 |
High-temp. |
|
Thermal Conductivity (W/m·K) |
14.6 (at 100°C) |
Good dissipation. |
|
Specific Heat (J/kg·K) |
500 |
Efficient. |
|
Thermal Expansion (10^-6 /°C) |
16.5 (20-100°C) |
Low distortion. |
UNS S31635's corrosion resistance, per ASTM A240/A240M and ASME SA240/SA240M, is enhanced by Ti.
UNS S31635 is highly weldable, Ti preventing sensitization. Fillers ER316L.
Gangsteel's UNS S31635 SA240 Type 316Ti fab without issues.
UNS S31635 suits chemical reactors (IGC resistance), marine piping (pitting).
In Gangsteel's supply to U.S. offshore, UNS S31635 performed without failure.
Equivalents: EN 1.4571 (identical number). For A240 GR 316Ti, number matches.
Gangsteel stocks UNS S31635 at $3,200-3,800/ton FOB. 1-200mm thick, certs. Contact for number-compliant stock.
Q: What is the UNS number for 316Ti stainless steel?
A: The UNS number for 316Ti is S31635, designating its titanium-stabilized austenitic composition for high-temp corrosion resistance.
Q: What does UNS S31635 mean for 316Ti?
A: UNS S31635 means a 300-series stainless steel (S3xxxx) with 316 base chemistry plus titanium (35), ensuring global traceability for 316Ti.
Q: Is UNS S31635 the same as 316Ti?
A: Yes, UNS S31635 is the official designation for 316Ti, the titanium-stabilized variant of 316.
Q: What standards use UNS S31635 for 316Ti?
A: UNS S31635 is used in ASTM A240/A240M for plates, A182 for fittings, and A312 for pipes, defining 316Ti specs.
Q: What is the chemical composition of UNS S31635?
A: UNS S31635 has C 0.08% max, Cr 16-18%, Mo 2-3%, Ni 10-14%, Ti 0.70% max, Mn 2% max, Si 0.75% max, P 0.045% max, S 0.03% max, N 0.10% max, Fe balance.
Q: What are the properties of UNS S31635?
A: UNS S31635 has tensile 515 MPa min, yield 205 MPa min, elongation 40% min, hardness 95 HRB max, density 8.00 g/cm³, and PREN 23-28 for corrosion.
Q: Where can I source UNS S31635 316Ti stainless steel?
A: Gangsteel stocks UNS S31635 at $3,200-3,800/ton FOB, 1-200mm thick. Dual certs available.
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