Stockist & supplier ASTM A240 · ASME SA-240 · ASTM A480
SS 321 Plates — ASTM A240 UNS S32100
SS 321 plate is titanium-stabilised austenitic stainless steel plate for service in the carbide-precipitation temperature range. Teshi Group stocks and supplies ASTM A240 / ASME SA-240 321 (UNS S32100) plate and sheet, and 321H against order. Quotes are sent in 24–48 hours.
Also called: 321 plate, UNS S32100 plate, 1.4541 plate, titanium stabilised stainless plate, 321H plate
What is an SS 321 Plate?
Type 321 is an 18-8 austenitic stainless steel with titanium added at a minimum of five times the carbon plus nitrogen content. The titanium ties up carbon as titanium carbide, so chromium carbides do not form at grain boundaries when the steel is held in the sensitising range or welded. This keeps resistance to intergranular corrosion after high-temperature exposure. 321 is used for exhaust systems, expansion joints, heater and furnace components, and refinery and chemical equipment operating at elevated temperatures; 321H has higher carbon for better creep strength.
Key features
- Stockist and supplier — sourced from stainless mills; Teshi does not manufacture plate
- ASTM A240 / ASME SA-240 Type 321 (UNS S32100)
- Titanium stabilised against sensitisation
- 321H (UNS S32109) against order for high-temperature strength
- Plate and sheet; other sizes supplied against order
- Matching A182 F321 flanges manufactured by Teshi
Specification
| Supply | Stockist & supplier — Teshi Group, India |
|---|---|
| Standard | ASTM A240 / ASME SA-240; general requirements ASTM A480 |
| Grades | 321 (S32100); 321H (S32109) against order |
| Product forms | Plate (3/16 in / 4.76 mm and thicker per ASTM A480), sheet and coil; other sizes supplied against order |
| Condition | Solution annealed and descaled (pickled) |
| Finish | No.1 (hot rolled, annealed, pickled) for plate; 2B, BA or No. 4 for sheet |
| Other plate grades stocked | Carbon / boiler: IS 2062 E250–E450, ASTM A36, A516 Gr 60 / 70, A537; Cr-Mo: ASTM A387 Gr 11, 12, 22, 91; stainless: ASTM A240 304 / 304L / 304H, 309S, 310S, 316 / 316L / 316H / 316Ti, 317L, 321 / 321H, 347 / 347H, 410, 430, 904L, 254 SMO; duplex S31803 / S32205; super duplex S32750 / S32760; nickel: Monel 400 (B127), Inconel 600 (B168), Inconel 625 (B443), Incoloy 800 / 800H / 800HT (B409), Incoloy 825 (B424), Hastelloy C276 / C22 (B575), Hastelloy B2 / B3 (B333), Alloy 20 (B463), Nickel 200 / 201 (B162); titanium Gr 1, 2, 5, 7, 12 (B265); Cu-Ni 90/10, 70/30 (B171) |
| Testing | Chemical and tensile tests per A240; intergranular corrosion test (ASTM A262) when specified |
| Documents | Mill test certificate to EN 10204 3.1; EN 10204 3.2 / third-party inspection when the order specifies |
Applications
- Exhaust manifolds and expansion bellows
- Refinery heater and furnace parts
- Chemical process equipment at elevated temperature
- Aircraft and engine exhaust components
- Heat exchanger parts
Chemical composition — 321 (ASTM A240)
| UNS | C | Mn | P | S | Si | Cr | Ni | N | Ti |
|---|---|---|---|---|---|---|---|---|---|
| S32100 (321) | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 17.0–19.0 | 9.0–12.0 | 0.10 | 5×(C+N) min, 0.70 max |
Maximum unless a range is shown; % by weight. Per ASTM A240 Table 1.
Mechanical properties
| UNS | Tensile, min (MPa) | Yield 0.2%, min (MPa) | Elongation in 50 mm, min (%) | Hardness, max |
|---|---|---|---|---|
| S32100 | 515 | 205 | 40 | 217 HBW / 95 HRB |
Per ASTM A240 Table 2.
Technical data sheets
Dimensions & weights
Material grades
All gradesFAQ
SS 321 Plate: common questions
Why is titanium added to 321?
Titanium combines with carbon to form titanium carbides, preventing chromium carbide formation at grain boundaries. This protects against intergranular corrosion after welding or high-temperature service.
What is the difference between 321 and 347?
Both are stabilised 18-8 grades. 321 uses titanium; 347 uses niobium (columbium). 347 is often preferred for welding consumables and some high-temperature applications. Both have the same minimum strength under ASTM A240.
When is 321H used?
321H has a controlled higher carbon range for better creep strength above about 500 °C. It is specified for high-temperature pressure parts. It is ordered against the specific UNS number S32109.
Does Teshi manufacture stainless plate?
No. Teshi Group is a stockist and supplier of SS 321 Plate, sourced from established mills and supplied with the original mill test certificate. Teshi is an OEM manufacturer of flanges, fittings, fasteners, valves and custom fabrications, which can be ordered with it.
Need a size or grade not listed here?
We source against your specification from approved mills, with mill test certificates and inspection before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
Quick RFQ
Quote for SS 321 Plate in 24–48 hours
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