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Published: November 11, 2025 | Updated: November 11, 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, AISI 316Ti emerges as a titanium-stabilized austenitic grade whose nickel (Ni) content is a critical element for austenite stability, corrosion resistance, and overall performance in high-temperature and corrosive environments.
As a premier producer and exporter based in China, Gangsteel has supplied thousands of tons of AISI 316Ti stainless steel, meeting ASTM A240/A240M specs for plates and sheets, to industries like petrochemical, pharmaceutical, and marine.
If you're examining the Ni content in AISI 316Ti under ASME SA240/SA240M for a welded structure or heat exchanger where phase balance and pitting resistance are key, understanding its range and role is essential. This article provides a comprehensive overview of AISI 316Ti's Ni content, its impact on properties, and insights, based on ASTM A240/A240M and ASME SA240/SA240M standards and our mill data.
From our production lines, we've optimized Ni content in AISI 316Ti: In a 2024 European chemical facility, our AISI 316Ti plates under ASTM A240 /A240M with 12% Ni maintained austenite stability at 600°C, preventing phase shifts and ensuring PREN 23-28 for pitting resistance, as per client metallographic analysis. Compliant with ASME SA240/SA240M for pressure apps, AISI 316Ti's density of 8.00 g/cm³ supports designs. Let's delve into the Ni content, from composition to benefits, to guide your material selection.
AISI 316Ti stainless steel Ni content under ASTM A240/A240M and ASME SA240/SA240M is 10.00-14.00%, typically 11-13%, playing a key role in stabilizing the austenitic phase, enhancing corrosion resistance (PREN 23-28), and providing ductility (elongation 40% min). Density 8.00 g/cm³, tensile 515 MPa min. Ni contributes ~20-30% to pitting resistance and prevents ferrite formation. Equivalent to EN 1.4571; superior to 304 in acids. Ideal for chemical reactors; Gangsteel stocks 1-200mm with certs for custom Ni analysis.
The chemical composition of AISI 316Ti, as specified in ASTM A240/A240M and ASME SA240/SA240M, includes a balanced Ni content for optimal properties.
|
Element |
% Range or Max |
Typical Value |
Role of Ni Content |
|---|---|---|---|
|
Carbon (C) |
0.08 max |
0.05 |
Ni stabilizes against C-induced hardening. |
|
Manganese (Mn) |
2.00 max |
1.00 |
Minor; Ni complements for toughness. |
|
Silicon (Si) |
0.75 max |
0.50 |
Ni aids Si's oxidation role. |
|
Phosphorus (P) |
0.045 max |
<0.030 |
Ni prevents P embrittlement. |
|
Sulfur (S) |
0.030 max |
<0.020 |
Ni minimizes S inclusions. |
|
Chromium (Cr) |
16.00-18.00 |
17.00 |
Ni enhances Cr passivation synergy. |
|
Molybdenum (Mo) |
2.00-3.00 |
2.50 |
Ni + Mo boost PREN to 23-28. |
|
Nickel (Ni) |
10.00-14.00 |
12.00 |
Stabilizes austenite; 10% min prevents ferrite, 14% max avoids over-stabilization; enhances acid resistance and ductility. |
|
Titanium (Ti) |
5x(C+N) min, 0.70 max |
0.50 |
Ni complements Ti stabilization. |
|
Nitrogen (N) |
0.10 max |
0.05 |
Ni + N for interstitial strengthening. |
|
Iron (Fe) |
Balance |
Balance |
Base; Ni tunes phase balance. |
Ni's 10-14% range (typically 11-13% in Gangsteel's melts) ensures full austenite (no ferrite >1%), contributing to pitting resistance and toughness. Higher Ni (>14%) risks sigma phase; lower (<10%) risks ferrite.
Gangsteel's AISI 316Ti meets ASME SA240/SA240M with measured Ni 12.5% avg.
For uns stainless steel plates, Ni content verified.
AISI 316Ti's mechanical properties, per ASTM A240/A240M and ASME SA240/SA240M, are enhanced by Ni's austenite stabilization.
|
Property |
Minimum Value |
Typical Range |
Ni Content Impact |
|---|---|---|---|
|
Tensile Strength (MPa) |
515 |
550-700 |
Ni stabilizes for higher tensile. |
|
Yield Strength (MPa) |
205 |
220-300 |
Ni + Cr for solid solution yield. |
|
Elongation (%) |
40 |
45-55 |
Ni boosts ductility. |
|
Hardness (HRB max) |
95 |
80-90 |
Ni keeps soft for forming. |
|
Impact (Charpy J) |
Not req. |
100+ at RT |
Ni improves low-temp toughness. |
Ni's range ensures balanced strength without brittleness.
Physical properties of AISI 316Ti, compliant with ASTM A240/A240M and ASME SA240/SA240M, are influenced by Ni for phase balance.
|
Property |
Value |
Ni Content Impact |
|---|---|---|
|
Density (g/cm³) |
8.00 |
Ni (8.9 g/cm³) slightly increases from Fe. |
|
Melting Range (°C) |
1370-1400 |
Ni lowers melting point slightly. |
|
Thermal Conductivity (W/m·K) |
14.6 (100°C) |
Ni reduces conductivity vs. Fe. |
|
Specific Heat (J/kg·K) |
500 |
Ni aids thermal efficiency. |
|
Thermal Expansion (10^-6 /°C) |
16.5 (20-100°C) |
Ni stabilizes expansion. |
Ni's 10-14% ensures austenite for consistent properties.
AISI 316Ti's corrosion resistance, per ASTM A240/A240M and ASME SA240/SA240M, is bolstered by Ni's role in passivation.
Ni's content (10-14%) is optimal for PREN without excess cost.
AISI 316Ti is highly weldable per ASTM A240/A240M, with Ni stabilizing austenite in HAZ. No preheat.
Gangsteel's AISI 316Ti SA240 Type 316Ti welds cleanly.
AISI 316Ti's Ni content suits chemical reactors (acid resistance), marine piping (stability).
In Gangsteel's supply to U.S. pharma, Ni 12% ensured compliance.
Equivalents: EN 1.4571 (Ni 10.5-13.5%). For A240 GR 316Ti, Ni matches.
Gangsteel stocks AISI 316Ti at $3,200-3,800/ton FOB. 1-200mm thick, certs with Ni data. Contact for analysis.
Q: What is the nickel content in AISI 316Ti stainless steel?
A: The nickel content in AISI 316Ti is 10.00-14.00%, typically 11-13%, stabilizing the austenitic phase and enhancing corrosion resistance, with 10% min preventing ferrite and 14% max avoiding over-stabilization.
Q: How does nickel content affect AISI 316Ti properties?
A: Nickel content (10-14%) in AISI 316Ti stabilizes austenite for ductility (40% elongation), boosts reducing acid resistance, and contributes to PREN 23-28 for pitting, with optimal 12% for balanced strength.
Q: What is the typical Ni level in AISI 316Ti?
A: Typical Ni level in AISI 316Ti is 12%, providing austenite stability without excess, as per ASTM A240/A240M heat analysis for consistent properties.
Q: How does Ni content in AISI 316Ti compare to 316L?
A: Identical Ni content (10-14%) in AISI 316Ti and 316L; both enhance acid resistance, but 316Ti's Ti complements Ni for high-temp IGC prevention.
Q: What role does nickel play in AISI 316Ti corrosion resistance?
A: Nickel (10-14%) in AISI 316Ti stabilizes the passive film for better resistance to reducing acids and chlorides, contributing ~20% to PREN 23-28 and improving SCC threshold.
Q: Is higher Ni content better in AISI 316Ti?
A: Optimal Ni content 10-14% in AISI 316Ti; higher (>14%) risks sigma phase, lower (<10%) ferrite—Gangsteel's 12% avg balances corrosion and cost.
Q: Where can I get AISI 316Ti with verified Ni content?
A: Gangsteel provides PMI-verified Ni content (10-14%) with EN 10204 3.1/3.2 certs for AISI 316Ti stock; contact for analysis reports.
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