SS 321 No.1 Finish SheetASTM A240 · ASTM A480 · Manufacturer, trader & exporter, India
AISI 321 · UNS S32100
An SS 321 no.1 finish sheet is hot-rolled, annealed and pickled sheet, made from SS 321 to ASTM A240. No.1 is a dull, rough finish for industrial use where appearance does not matter — tanks, chutes and heat-resisting parts.
- ASTM A240
- ASTM A480
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 321 No.1 Finish Sheet?
- What it is
- Hot-rolled, annealed and pickled sheet
- Material
- ASTM A240
- Dimensions
- ASTM A480
- Grade
- SS 321 · UNS S32100
- Best at
- High-temperature service between 425 and 815 °C
SS 321 No.1 Finish Sheet Specification
| Product | SS 321 No.1 Finish Sheet |
|---|---|
| Material standard | ASTM A240 |
| Dimensional standard | ASTM A480 |
| Thickness | Below 4.76 mm (3/16") |
| Size | 1000 / 1219 / 1250 / 1500 × 2000 / 2438 / 2500 / 3000 mm or cut |
| Testing | PMI (as specified in the PO) · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 or 3.2 on request / as specified in the PO |
When to Choose a No.1 Finish Sheet
No.1 is a dull, rough finish for industrial use where appearance does not matter — tanks, chutes and heat-resisting parts.
- Hot rolled, annealed, pickled
- Dull and rough
- Heavier gauges
More on choosing: No.1 finish sheet guide.
SS 321 No.1 Finish Sheet: Why 321 for no.1 finish sheets
No.1 is a dull, rough finish for industrial use where appearance does not matter — tanks, chutes and heat-resisting parts. In SS 321, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Stainless sheet is formed and finished for visible or hygienic surfaces. SS 321 is picked for high-temperature service between 425 and 815 °C. |
|---|---|
| Typical service | Aircraft exhaust — Manifolds, bellows and exhaust systems. |
| Matching filler | ER347 (AWS A5.9) |
SS 321 No.1 Finish Sheet Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Titanium | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Nitrogen | As specified |
| Phosphorus | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S32100.
SS 321 No.1 Finish Sheet Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S32100 — Annealed plate & sheet.
Full chemistry, properties and equivalents are on the SS 321 grade page.
Other SS 321 sheets
SS 321 No.1 Finish Sheet — questions buyers ask
Where is No.1 finish used?
Industrial parts, tanks and heat-resisting components where surface appearance is not important.
Which standard covers SS 321 no.1 finish sheets?
The material is ASTM A240; dimensions follow ASTM A480. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 321 no.1 finish sheet?
The alloy price, the size and dimensions, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 or 3.2 certificates available on request / as specified in the PO; dimensional reports as required. PMI can be arranged depending on product and requirements, as specified in the PO.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026