SS 304L SheetASTM A240 UNS S30403 · Manufacturer, stockist & exporter, India
Also sold as AISI 304L · UNS S30403 · W.Nr 1.4307 · Low-carbon 304
SS 304L sheet is SS 304L (UNS S30403) rolled below 3/16" (4.76 mm) thick for formed, pressed and lined parts under ASTM A240. It is a low-carbon austenitic chromium-nickel stainless steel, chosen for welded tanks, piping and vessels in general corrosive service. Kanak Steel & Engineering Co. supplies it with EN 10204 3.1 mill certificates from Mumbai to buyers across India, the Gulf, South-East Asia, South America, Europe, the UK and the USA.
- Stock & mill supply
- EN 10204 3.1 / 3.2
- PMI on request
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is SS 304L Sheet?
SS 304L sheet is a low-carbon austenitic chromium-nickel stainless steel supplied as sheet to ASTM A240 (UNS S30403). Buyers specify it for welded tanks, piping and vessels in general corrosive service. It is also sold as AISI 304L, UNS S30403, W.Nr 1.4307.
- What it is
- Low-carbon austenitic chromium-nickel stainless steel
- Standard
- ASTM A240
- Thickness
- Below 3/16" (4.76 mm)
- Density
- 8 g/cm³
- Supplied as
- Annealed · 2B, BA, No.4
- Best at
- Welded tanks, piping and vessels in general corrosive service
SS 304L Sheet Specification & Sizes
| Material standard | ASTM A240 · ASME SA-240 |
|---|---|
| General requirements | ASTM A480 — dimensions, tolerances and finishes |
| Grade | SS 304L · UNS S30403 · W.Nr 1.4307 |
| Thickness | Below 3/16" (4.76 mm) — thicker is plate |
| Width × length | 1000 / 1219 / 1250 / 1500 mm × 2000 / 2438 / 2500 / 3000 mm, or cut to size |
| Condition & finish | Annealed · 2B, BA or No.4 |
| Cutting | Cut to size and to width |
| Testing | PMI · UT (plate) · intergranular corrosion · hardness, on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection · packing list · certificate of origin |
Sheet or plate?
Both are ordered under ASTM A240, so buyers often mix them up. The line is thickness: below 3/16" is sheet, 3/16" and over is plate. If your drawing calls for 3/16" (4.76 mm) or more, you need SS 304L plate.
SS 304L Sheet Finishes — Which to Order
Sheet is bought for its surface as much as its chemistry. The finish is set at the mill and cannot be fixed later without polishing cost, so name it on the order. Finish designations for 304L sheet follow ASTM A480.
| Finish | How it is made | Choose it for |
|---|---|---|
| 2D | Cold rolled, annealed and pickled | Dull matt grey. Holds lubricant well, so it is the finish for deep drawing and parts that are painted or hidden. |
| 2B | As 2D, then a light skin pass on polished rolls | Smooth, moderately reflective. The standard general-purpose sheet finish and the one to order if the drawing says nothing. |
| BA (2R) | Bright annealed in a protective atmosphere | Bright, highly reflective and very smooth. Used for reflectors, hygienic and decorative surfaces; ask for protective film. |
| No.4 | Abrasive polished with a directional grain | Brushed look that hides handling marks. Food equipment, architecture and panels. |
SS 304L Sheet Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Nitrogen | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
| Iron | 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 S30403.
SS 304L 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 S30403 — Annealed plate & sheet.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 8 g/cm³ |
| Melting range | 1400 – 1450 °C |
| Magnetic | Non-magnetic annealed |
| PREN (approx.) | ≈ 18 |
SS 304L Equivalent Grades
SS 304L Sheet Weight Chart & Calculator
Use this to budget freight and price per piece. Weight (kg) = length (m) × width (m) × thickness (mm) × 8.
Example: 2500 × 1250 × 2 mm
2.5 × 1.25 × 2 × 8 = 50.0 kg
Total weight —
| Thickness | 2500 × 1250 sheet | Per m² |
|---|---|---|
| 0.5 mm | 12.5 kg | 4.0 kg |
| 0.8 mm | 20.0 kg | 6.4 kg |
| 1 mm | 25.0 kg | 8.0 kg |
| 1.2 mm | 30.0 kg | 9.6 kg |
| 1.5 mm | 37.5 kg | 12.0 kg |
| 2 mm | 50.0 kg | 16.0 kg |
| 3 mm | 75.0 kg | 24.0 kg |
| 4 mm | 100.0 kg | 32.0 kg |
SS 304L sheet gauge to mm
Gauge numbers are still common on drawings. Weights below use the density of SS 304L, 8 g/cm³.
Full chart: SWG sheet gauge chart.
| SWG | mm | inch | kg/m² (ρ 8) |
|---|---|---|---|
| 10 | 3.251 | 0.1280 | 26.01 |
| 11 | 2.946 | 0.1160 | 23.57 |
| 12 | 2.642 | 0.1040 | 21.14 |
| 14 | 2.032 | 0.0800 | 16.26 |
| 16 | 1.626 | 0.0640 | 13.01 |
| 18 | 1.219 | 0.0480 | 9.75 |
| 20 | 0.914 | 0.0360 | 7.31 |
| 22 | 0.711 | 0.0280 | 5.69 |
| 24 | 0.559 | 0.0220 | 4.47 |
Six-digit Harmonized System heading (iron and steel, chapter 72–73). Your country adds its own digits — confirm with your customs broker. All HS codes.
How to Verify SS 304L Sheet with PMI
Positive material identification with a handheld XRF gun confirms the alloy on the piece itself, in seconds, before it is cut or welded. SS 304L is most often mixed up with SS 316 / 316L — the table shows which elements tell them apart.
Handheld XRF does not measure carbon or nitrogen, so it cannot tell 304 from 304L: the low carbon is confirmed by the mill certificate or optical emission (OES) testing. PMI can be arranged on request — state it on your enquiry.
Under technical review for TDS.
| Element | SS 304L | SS 316 / 316L |
|---|---|---|
| Nickel | As specified | As specified |
| Chromium | As specified | As specified |
| Molybdenum | — | As specified |
| Iron | As specified | As specified |
| Manganese | As specified | As specified |
SS 304L Sheet Price — What Decides It
Two quotes for "304L sheet" can differ by 20% and both be fair. We quote 304L sheet per kg for full sizes and per piece for cut sizes. These six things move the price per kg, so you can compare offers like for like.
SS 304L Sheet Tolerances, Edge & Flatness
Thickness, width, length and flatness tolerances for 304L sheet come from ASTM A480, the general-requirements standard called up by the product specification. Most quality problems with sheet are about these four, not the chemistry.
| Thickness tolerance | Per ASTM A480 tables, by thickness and width; ask for a tighter range on the PO if your press tooling needs it |
|---|---|
| Edge | Mill edge, or slit / cut edge for an exact width |
| Flatness | Standard flatness per ASTM A480; specify levelled or tension-levelled sheet where flatness is critical |
| Surface protection | PVC / PE film on bright and polished finishes; use laser-grade film if the sheet will be laser cut |
| Marking | Grade, heat number and standard on each sheet, or on each bundle for small pieces |
Sheet, Strip, Plate or Coil?
Under ASTM A480, flat material below 3/16" (4.76 mm) and 24" or wider is sheet; cold-rolled material narrower than 24" is strip; 3/16" (4.76 mm) and over it is plate (the metric edition, A480M, rounds these to 5 mm and 600 mm). Coil is the same product wound up for continuous processing — order coil if you will slit, blank or roll-form it yourself.
SS 304L Sheet Applications
Sheet goes where 304L has to be formed, pressed or used as a thin lining. For heavy shells, tube sheets and machined parts, see SS 304L plate.
How your 304L sheet order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked against your order; PMI before processing is available on request.
- 03Processing — cutting to your sizes, with heat numbers transferred to every piece.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Forming & Welding SS 304L Sheet
Thin sheet is formed, folded and welded with little margin for heat. These are the points fabricators ask us about — matching filler for 304L is ER308L (AWS A5.9).
General guidance only; follow your approved WPS and forming procedure.
| Bending | Annealed austenitic sheet bends to tight radii but springs back more than carbon steel; over-bend slightly. |
|---|---|
| Work hardening | Heavy cold work raises hardness; your code may call for re-annealing after severe forming. |
| Thin-gauge welding | TIG (GTAW) with low heat input; argon back-purge the root to stop oxidation. |
| Distortion | Clamp to copper backing bars and stitch-tack before full welds. |
| Clean-up | Remove heat tint by pickling or passivation; keep carbon-steel tools and grinding dust away. |
How to Order SS 304L Sheet: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Standard and edition — e.g. ASTM A240-latest
- Thickness × width × length, and number of pieces
- Finish (2B, BA, No.4…) and protective film if needed
- Certificate type — 3.1 or 3.2, and the inspection agency
- Extra tests — UT, intergranular corrosion
- Delivery port, Incoterm and required date
SS 304L sheet for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 304L sheet — questions buyers ask
Is SS 304L the same as AISI 304L?
AISI 304L, UNS S30403, W.Nr 1.4307 are names used for SS 304L (W.Nr / EN numbers and older UNS variants are the closest designations; their limits can differ slightly, so specify the UNS number and ASTM grade on the order), and sheet is ordered to ASTM A240 whichever name is on the enquiry.
What is the price of SS 304L sheet per kg?
It moves with nickel on the LME, so a fixed list price is out of date within days. Thickness, cut size, quantity and documents also change it. Send your size and quantity and we quote the same working day.
What documents come with an export shipment?
An EN 10204 3.1 mill certificate (or 3.2 with a third-party inspector), commercial invoice, packing list with heat numbers, and certificate of origin. Test reports are added for any extra tests ordered.
Which finish should I order for SS 304L sheet?
2B, unless the drawing says otherwise. Order BA for a mirror-like surface, No.4 for a brushed look and 2D for deep drawing.
Is SS 304L sheet ordered by gauge or by millimetre?
ASTM A240 uses millimetres or inches. Gauge numbers still appear on older drawings; the gauge-to-mm table on this page converts them, with 8 g/cm³ weights for 304L.
Can I order SS 304L sheet cut to size?
Yes. Send finished sizes and quantities, or a drawing; we quote cut pieces as well as full sheets. Tell us if edges must be deburred or protected.
Sheet, strip or coil — which should I order?
Sheet if you need flat pieces below 3/16" (4.76 mm) and at least 24" wide; strip if narrower; coil if you will slit, blank or roll-form the material on your own line.
What is the minimum order for sheet?
There is no fixed minimum for stock sizes — single sheets and cut pieces are quoted. Mill orders for a non-stock thickness or finish carry the mill minimum.
SS 304L or Duplex 2205 — which should I choose?
SS 304L is chosen for welded tanks, piping and vessels in general corrosive service. Duplex 2205 is the step up when you need more pitting resistance or strength. See the comparison table on this page, or ask us with your process conditions.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026