We are Riddhi Siddhi Impex, a Mumbai-based supplier and stockist of Stainless Steel 904L Sheets & Plates, established in 2002. Our warehouses hold this super austenitic flat product to ASTM A240 / ASME SA-240 in thicknesses of 3.8 mm and above and widths up to 2000 mm. As an ISO 9001, 14001, and 45001-certified company, we keep a monthly supply capacity of 400-500 tonnes and export worldwide.
Stainless Steel 904L sheets and plates are flat-rolled stock of a super austenitic grade alloyed with 23 to 28% nickel, 19 to 23% chromium, 4 to 5% molybdenum, and 1 to 2% copper. The copper addition keeps the passive film stable in dilute sulphuric acid, an environment that attacks standard austenitic grades such as 316L, and a pitting resistance number near 35 covers chloride-bearing streams. Designers specify UNS N08904 plate for vessel shells, tank walls, and tube sheets in acid duty.
We buy this grade from reputed primary mills and hold it in ready stock. Sheets handle cold rolled to 6 mm and plates hot rolled to 10 mm. Every consignment ships solution annealed, with EN 10204 Type 3.1 / 3.2 mill test certificates on request.
We provide ASTM A240 Grade 904L sheets and plates ex-stock, annealed, with a choice of five finishes. Custom widths come off our precision slitting lines at ±0.1 mm.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Thickness (Sheets, CR) | 3.8 mm to 6 mm |
| Thickness (Plates, HR) | 6 mm and above |
| Width | Up to 2000 mm |
| Width Tolerance | ±0.1 mm on slit widths; mill tolerance on mill-edge material |
| Condition | Annealed (standard mill) |
| Surface Finish | No. 1 (hot rolled plate); 2B, BA, brushed (No. 4), matte (cold rolled sheet |
| Supply Forms | Hot rolled and Cold rolled |
| Edge | Mill edge as standard; slit edge on custom widths |
| Form | Sheets, Plates |
Copper at 1.0 to 2.0% separates the SS 904L sheet from every standard austenitic grade. With 4.0 to 5.0% molybdenum on a high nickel base, the analysis stays passive in reducing acids.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.020 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.035 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 19.0 - 23.0 |
| Nickel (Ni) | 23.0 - 28.0 |
| Molybdenum (Mo) | 4.0 - 5.0 |
| Copper (Cu) | 1.0 - 2.0 |
| Nitrogen (N) | 0.10 max |
Annealed 904L SS plate pairs 490 MPa minimum tensile strength with a 220 MPa yield point and 35% elongation. The grade accepts no hardening heat treatment; we supply it solution annealed only.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
490 MPa (71 ksi) |
|
Yield Strength (0.2% offset), minimum
|
220 MPa (31 ksi) |
|
Elongation in 50 mm, minimum
|
35% |
|
Hardness, maximum
|
90 HRB |
Buyers working with European, Japanese, or Swedish codes can match our AISI 904L sheets and plates through the designations below.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N08904 |
| Europe (EN) | X1NiCrMoCu25-20-5 |
| Germany (W.Nr) | 1.4539 |
| Japan (JIS) | SUS890L |
| Sweden (SS) | 2562 |
These 4 industries use most of the 904L stainless steel plate we supply. Each runs acid or chloride service severe enough to step past 316L without paying full nickel alloy prices.
Sulphuric and phosphoric acid plants build reactors, storage tanks, and column shells from ASTM A240 Grade 904L plate. Fabricators weld thick sections without post-weld annealing due to the 0.020% carbon cap, and the copper-bearing analysis stays passive through acid concentrations that corrode standard austenitic vessels.
Equipment builders form 904L stainless steel sheet into vessel linings, mixing tanks, and heat exchanger plates for pharma and food lines. The material survives daily clean-in-place cycles with hot caustic and chloride sanitisers, and its corrosion resistance keeps iron pickup out of the product stream.
Bleach plant washers, towers, and filtrate tanks face chlorine dioxide and hot, acidic liquor daily. Mills line this equipment with Alloy 904L sheet because it holds up in bleaching service where 316L corrodes, without the cost of a 6Mo alloy.
Refineries use UNS N08904 plates in amine circuit exchangers, produced-water separators, and sour service internals. Power stations use the same material in flue-gas desulphurisation scrubbers, where condensing sulphuric acid attacks carbon steel and standard stainless steel alike. Chloride stress corrosion cracking resistance secures long exchanger life.
Orders are shipped flat-packed, cased in wood or palletised, documented for sea.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW |
| Dispatch Points | Mumbai and Taloja warehouses |
| Port | Mumbai |
| Standard Lead Time | 4-5 days |
| Urgent Dispatch | 2-3 days |
| Payment Terms | Advance, credit, LC |
| Certification | EN 10204 Type 3.1 / 3.2 mill test certificates on request |
Stainless Steel 904L Sheets & Plates price in India ranges from ₹600-₹950 per kg. Export orders price at $7.5-10.5 per kg. Nickel, molybdenum, and copper markets move the base rate; thickness, finish, and volume settle the final figure. Ranges are indicative, so call or WhatsApp our team for today's rate.
We stock Stainless Steel 904L Sheets & Plates from 3.8 mm to 10 mm in widths up to 2000 mm. Cold rolled sheets cover gauges to 6 mm; hot rolled plates take over above that.
The difference between 904L and 316L sheets and plates is alloy loading. 904L carries roughly double the nickel, 4 to 5% molybdenum, and a copper addition that 316L lacks, so it withstands dilute sulphuric acid and chlorides that pit 316L.
Yes, Stainless Steel 904L Sheets & Plates conform to ASTM A240 / ASME SA-240 under UNS N08904, with EN 1.4539 as the European equivalent. We certify every dispatch to the ordered specification.
904L SS plates need no post-weld heat treatment. Carbon capped at 0.020% prevents carbide precipitation in the heat-affected zone. Fabricators normally use an over-alloyed filler so that weld metal matches the corrosion resistance of the parent plate.
You can source Stainless Steel 904L Sheets & Plates in India from us at Riddhi Siddhi Impex, a supplier, stockist, and exporter since 2002. Stock moves from our Mumbai and Taloja warehouses in 4-5 days, or 2-3 days for urgent. Call or WhatsApp us; a quote will reach you within 24 hours.
