TITANIUM-STABILIZED STAINLESS · EXACT-GRADE TECHNICAL SOURCING
Stabilized Austenitic Stainless Steels — 321, 321H & 316Ti
Technical sourcing of 321, 321H and 316Ti products by exact UNS or EN grade, form, condition, temperature regime and inspection requirements.
MNK-G.S.A coordinates stabilized austenitic stainless inquiries for flat products, bars, wire, tube, pipe, forgings, components and parts to drawing while keeping each grade and product standard separate.
Grade Identity and Verification
- 321 / UNS S32100 / EN 1.4541 is a titanium-stabilized chromium-nickel austenitic grade used where resistance to intergranular corrosion after fabrication and extended-temperature service are relevant.
- 321H / UNS S32109 and the EN 1.4878 high-temperature route are intended for temperature regimes where creep-related requirements can become important; the H designation must be stated explicitly.
- 316Ti / UNS S31635 / EN 1.4571 adds molybdenum to the stabilized austenitic family and has a different corrosion and service profile from 321 or 321H.
- 321, 321H and 316Ti are not universal equivalents. Their chemistry, carbon control, product standards, mechanical properties and acceptance routes differ.
- The project specification, design temperature, process medium, fabrication history and certificate determine which grade can be offered.
Product Forms, Standards and Supply Formats
| 321 / S32100 / 1.4541 | Cold- or hot-rolled coil, sheet, strip, plate, bar, tube, pipe, forgings and components only where the selected product standard includes the exact grade |
| 321H / S32109 / 1.4878 route | High-temperature plate, bar, tube, pipe, forgings and components with explicit carbon-controlled designation and creep or code requirements |
| 316Ti / S31635 / 1.4571 | Molybdenum-alloyed stabilized flat, long, tubular and forged products for corrosion and elevated-temperature requirements defined by the project |
| Flat-product route | ASTM A240/A480 or EN 10088-2; manufacturer programmes list cold-rolled coil and sheet, hot-rolled coil and sheet or plate, quarto plate and selected precision strip |
| Long, tube and forging routes | ASTM A276/A479, A213/A269/A312, A182/A965 or EN 10088-3, EN 10216-5, EN 10217-7 and EN 10222-5 as applicable to the grade and product |
| Supply format | Mill sheet or plate, coil, cut blank, bar in mill or cut length, tube or pipe in straight or cut lengths, forging, flange, fitting, valve part or component to drawing |
Application Context
Potential applications include welded pressure vessels, flanges and valves, exhaust and flue-gas components, stack liners, furnace and case-hardening equipment, refinery and boiler parts and selected chemical or process equipment. The exact choice depends on the corrosive medium, temperature, creep and fatigue loading, weld exposure, section thickness and design code. Stabilization alone does not prove suitability.
RFQ and Quality Controls
- Exact 321, 321H or 316Ti designation in UNS, ASTM, EN or customer notation
- Product standard and form: flat, long, tube, pipe, forging or manufactured component
- Dimensions, tolerances, finish, condition and required cut or fabrication scope
- Continuous and peak temperature, process medium, thermal cycling and design life
- Mechanical, creep, corrosion, NDT, pressure-code and welding requirements
- EN 10204 certificate route, heat traceability, quantity, packing and destination
Related Technical Pages
Technical Sources
- ASTM A240/A240M-26
- ASTM A276/A276M-25
- ASTM A479/A479M-25
- ASTM A269/A269M-25
- ASTM A312/A312M-25
- ASTM A182/A182M-26a
- ASTM A965/A965M-26
- BS EN 10088-2:2024
- BS EN 10088-3:2023
- BS EN 10216-5:2021
- BS EN 10217-7:2021
- ISO 15510:2014
- Outokumpu Core 321/4541
- Outokumpu Therma range — 321H
- Outokumpu Supra range — 316Ti
The page groups titanium-stabilized austenitic grades for procurement convenience while preserving their separate identities. MNK verifies the exact grade and product standard; 321, 321H and 316Ti are never presented as automatic substitutes.
Related ASTM Reference Pages
Select the governing specification by product form and service route. The standard designation does not by itself confirm that a particular grade, condition or project requirement is included.
- ASTM A240/A240M-26 — plate, sheet and strip
- ASTM A276/A276M-25 — bars and shapes
- ASTM A479/A479M-25 — bars for pressure service
- ASTM A269/A269M-25 — general-service tubing
- ASTM A312/A312M-25 — austenitic stainless pipe
- ASTM A182/A182M-26a — forged piping components
- ASTM A965/A965M-26 — austenitic stainless forgings
Relevant EN Product-Form References
These references support order preparation by product form. The current authorised standard, material grade, edition, design code and project documents must be verified before quotation.
Relevant ISO References
Use the current authorised edition together with the governing product specification, project requirements and inspection documents. A standards reference does not establish automatic grade equivalence or product approval.
Intergranular-Corrosion Test References
Stabilization does not remove the need to define grade, heat treatment, fabrication condition, sample preparation and the exact governing acceptance route.
Send Your Technical Inquiry
Send the exact grade and product standard, form, dimensions, service temperature and medium, fabrication and code requirements, inspection documents, quantity and delivery destination.