SS 904L Sheet – Supplier & Exporter in India
ASTM A240 / ASME SA240 · UNS N08904
Also sold as Alloy 904L · UNS N08904 · W.Nr 1.4539
SS 904L sheet is Alloy 904L (UNS N08904) rolled below 3/16" (4.76 mm) thick for formed, pressed and lined parts under ASTM A240. It is a super-austenitic stainless steel with high nickel, molybdenum and copper, chosen for dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water. Kanak Steel & Engineering Co. manufactures, trades and exports SS 904L sheet; depending on the product and order, material is produced or sourced and processed to the PO. EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO. Markets we have supplied to include Oman, UAE, Saudi Arabia, Brazil, Argentina, Spain and Chile (India is the home market).
- Mill & traded supply
- EN 10204 3.1 / 3.2 as specified in the PO
- PMI on request
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is SS 904L Sheet?
SS 904L sheet is a super-austenitic stainless steel with high nickel, molybdenum and copper supplied as sheet to ASTM A240 (UNS N08904). Buyers specify it for dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water. It is also sold as Alloy 904L, UNS N08904, W.Nr 1.4539.
- What it is
- Super-austenitic stainless steel with high nickel, molybdenum and copper
- Standard
- ASTM A240
- Thickness
- Below 3/16" (4.76 mm)
- Density
- 7.95 g/cm³
- Supplied as
- Annealed · 2B, BA, No.4
- Best at
- Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water
SS 904L Sheet Sizes, Thickness & Specification
| Material standard | ASTM A240 · ASME SA-240 |
|---|---|
| General requirements | ASTM A480 — dimensions, tolerances and finishes |
| Grade | SS 904L · UNS N08904 · W.Nr 1.4539 |
| Thickness | 0.3 mm to below 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 or 3.2 on request / as specified in the PO · third-party inspection on request · 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 904L plate, which Kanak supplies hot-rolled from 4.76 to 100 mm and cold-rolled from 4.76 to 8 mm.
SS 904L Sheet vs Plate Thickness by Production Route
Kanak supplies SS 904L across the sheet and plate thickness bands below. Confirm the thickness, finish and quantity on your RFQ — prices are quoted on enquiry.
| Product | Route | Thickness supplied | Typical finishes | Page |
|---|---|---|---|---|
| Sheet | Cold-rolled | 0.3 mm to below 4.76 mm | 2B, BA, No.4 (polished) | SS 904L sheet |
| Plate | Cold-rolled | 4.76 – 8 mm (thicker cold-rolled on request) | 2B / smoother surface | SS 904L cold-rolled plate |
| Plate | Hot-rolled | 4.76 – 100 mm | No.1 (HRAP) | SS 904L hot-rolled plate |
Sheet/plate boundary per ASTM A480: 3/16" (4.76 mm). The SI edition ASTM A480M uses 5.00 mm. Width conditions also apply under A480 (sheet typically ≥24" / 600 mm wide; plate definitions include a width condition). Upper limits are supply ranges for quotation, not a standard maximum. Thicker cold-rolled plate can be quoted on request.
Common SS 904L sheet thicknesses
Most drawings call for one of the thicknesses below. Kanak can quote any thickness from 0.3 mm up to the 4.76 mm plate line, in 2B, BA or No.4, as full sheets or cut to size. Put the thickness, finish and sheet size on your RFQ.
| Range | Common thicknesses (mm) |
|---|---|
| Thin gauge | 0.3 · 0.4 · 0.5 · 0.6 · 0.7 · 0.8 · 0.9 |
| Mid gauge | 1.0 · 1.2 · 1.5 · 2.0 |
| Heavy gauge | 2.5 · 3.0 · 4.0 · 4.5 |
Common sheet sizes: 1000 × 2000, 1219 × 2438 (4 × 8 ft), 1250 × 2500 and 1500 × 3000 mm, or cut to size. From 4.76 mm the material is SS 904L plate.
Stainless Steel 904L Sheet Finishes: 2B, BA, No.4 and More
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 904L 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 904L Sheet Chemical Composition
| Element | Weight % (ASTM A240) |
|---|---|
| Nickel | 23.0–28.0 |
| Chromium | 19.0–23.0 |
| Molybdenum | 4.0–5.0 |
| Copper | 1.0–2.0 |
| Carbon | ≤0.020 |
| Manganese | ≤2.00 |
| Silicon | ≤1.00 |
| Nitrogen | ≤0.10 |
| Phosphorus | ≤0.045 |
| Sulphur | ≤0.035 |
| Iron | Balance |
Chemical composition per ASTM A240 for UNS N08904 (SS 904L). Confirm the edition named on your purchase order.
SS 904L 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 N08904 — Annealed plate & sheet.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.95 g/cm³ |
| Melting range | 1300 – 1390 °C |
| Magnetic | Non-magnetic (annealed) |
| PREN (approx.) | ≈ 35 |
SS 904L Equivalent Grades
SS 904L Sheet Weight Chart & Calculator
Use this to budget freight and price per piece. Weight (kg) = length (m) × width (m) × thickness (mm) × 7.95.
Example: 2500 × 1250 × 2 mm
2.5 × 1.25 × 2 × 7.95 = 49.7 kg
Total weight —
| Thickness | 2500 × 1250 sheet | Per m² |
|---|---|---|
| 0.5 mm | 12.4 kg | 4.0 kg |
| 0.8 mm | 19.9 kg | 6.4 kg |
| 1 mm | 24.8 kg | 8.0 kg |
| 1.2 mm | 29.8 kg | 9.5 kg |
| 1.5 mm | 37.3 kg | 11.9 kg |
| 2 mm | 49.7 kg | 15.9 kg |
| 3 mm | 74.5 kg | 23.9 kg |
| 4 mm | 99.4 kg | 31.8 kg |
SS 904L sheet gauge to mm
Gauge numbers are still common on drawings. Weights below use the density of SS 904L, 7.95 g/cm³.
Full chart: SWG sheet gauge chart.
| SWG | mm | inch | kg/m² (ρ 7.95) |
|---|---|---|---|
| 10 | 3.251 | 0.1280 | 25.85 |
| 11 | 2.946 | 0.1160 | 23.42 |
| 12 | 2.642 | 0.1040 | 21.00 |
| 14 | 2.032 | 0.0800 | 16.15 |
| 16 | 1.626 | 0.0640 | 12.93 |
| 18 | 1.219 | 0.0480 | 9.69 |
| 20 | 0.914 | 0.0360 | 7.27 |
| 22 | 0.711 | 0.0280 | 5.65 |
| 24 | 0.559 | 0.0220 | 4.44 |
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 904L 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 904L is most often mixed up with Inconel 825 — the table shows which elements tell them apart.
Handheld XRF does not measure carbon or nitrogen; those come from 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 904L | Inconel 825 |
|---|---|---|
| Nickel | As specified | As specified |
| Chromium | As specified | As specified |
| Molybdenum | As specified | As specified |
| Copper | As specified | As specified |
| Titanium | — | As specified |
| Iron | As specified | As specified |
| Manganese | As specified | As specified |
SS 904L Sheet Price — What Decides It
Two quotes for "904L sheet" can differ by 20% and both be fair. We quote 904L 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 904L Sheet Tolerances, Edge & Flatness
Thickness, width, length and flatness tolerances for 904L 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 marked as specified in the PO (piece or bundle) |
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 904L Sheet Applications
Sheet goes where 904L has to be formed, pressed or used as a thin lining. For heavy shells, tube sheets and machined parts, see SS 904L plate.
How your 904L 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 can be arranged depending on product and requirements, as specified in the PO.
- 03Processing — cutting to your sizes, with heat numbers transferred where the PO requires it.
- 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 904L Sheet
Thin sheet is formed, folded and welded with little margin for heat. These are the points fabricators ask us about — matching filler for 904L is ER385 (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 904L 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
Exporting SS 904L Sheet to Saudi Arabia
SS 904L sheet is exported from Mumbai / Nhava Sheva to Saudi discharge ports including King Abdulaziz Port (Dammam), Jubail Commercial Port and Jeddah Islamic Port — FOB Nhava Sheva or CIF the named port, as agreed on the order. Kanak Steel & Engineering Co. is a Mumbai manufacturer, trader and exporter; it does not claim an office, warehouse or stockholding in the Kingdom.
Buyers typically order ASTM A240 / ASME SA240 material (UNS N08904) with dimensions to ASTM A480: cold-rolled sheet below the A480 plate boundary, commonly in 2B, BA and No.4 finishes, cut to size where ordered. EN 10204 3.1 or 3.2 mill test certificates are available on request / as specified in the PO, with packing list and certificate of origin; third-party inspection can be arranged when named on the enquiry. Prices are quoted on enquiry (USD or INR) — nickel and molybdenum move the base, and thickness, cut size, finish and documents change the landed figure.
Where a project names SAMSS or other purchaser specifications, send the specification with the RFQ so documents and tests can be matched. This page does not claim Aramco vendor or source approval. Full country logistics: export to Saudi Arabia.
- Ports: Dammam · Jubail · Jeddah (FOB / CIF from Nhava Sheva)
- Standard: ASTM A240 / ASME SA240 · dimensions ASTM A480
- Documents: EN 10204 3.1 or 3.2 as specified in the PO
- Price: on enquiry — no fixed list price
SS 904L sheet — questions buyers ask
Is SS 904L the same as Alloy 904L?
Alloy 904L, UNS N08904, W.Nr 1.4539 are names used for SS 904L (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 904L 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?
EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO, with 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 904L 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 904L 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 7.95 g/cm³ weights for 904L.
Can I order SS 904L 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: single sheets and cut pieces can be quoted. Where a thickness or finish has to be ordered from the mill, the mill minimum applies.
Can SS 904L sheet be supplied in polished (No.4 / No.8) finish?
Yes, No.4 and mirror (No.8) finishes can be arranged depending on thickness and requirements, as specified in the PO. See SS 904L No.4 finish sheet and SS 904L mirror finish sheet.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026