Stainless Steel 904L Sheets & Plates
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Stainless Steel 904L Sheets & Plates is the stainless steel of choice for applications that require corrosion resistance, hardness and strength in highly aggressive chemical service environments including sulphuric acid, phosphoric acid, seawater, and chloride-bearing process streams. Aashish Metal & Alloys, a leading Stainless Steel 904L Sheets and plates supplier in Mumbai, offers mill certification, and surface finish as per ASTM A240/ASME SA240 from wide range of thickness, width and surface finish in stock and ready to ship across India and abroad.
Our 904L stock range is used by engineers, procurement and fabricators in a wide variety of industries, including pharmaceutical, oil & gas, chemical processing and marine. Our technical team ensures dimensional conformance within the tolerances specified in ASTM A240 / EN 10088-2, with full documentation provided with every shipment
What Is Stainless Steel 904L?
Stainless Steel 904L (UNS N08904 / DIN 1.4539) is a low-carbon, high-alloy austenitic stainless steel specifically engineered for aggressive, highly corrosive environments. Unlike standard grades such as 316L, 904L incorporates elevated levels of nickel (23–28%), chromium (19–23%), molybdenum (4–5%), and copper (1–2%), making it exceptionally resistant to:
- Strong reducing acids such as sulphuric, phosphoric, and acetic acid
- Chloride-induced stress corrosion cracking (SCC)
- Pitting and crevice corrosion in seawater and saline environments
- Inter-granular corrosion at elevated temperatures
- Oxidizing and reducing media simultaneously
The addition of copper significantly reduces corrosion rates in dilute sulphuric acid, making this grade indispensable in chemical processing pipelines, scrubbers, heat exchangers, and pharmaceutical reactors.
Technical Data
SS 904L Sheet & Plate Specifications: Thickness, Width & Finish
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA240 |
| Grade | SS 904L / UNS N08904 / DIN 1.4539 / SUS 904L |
| Thickness | Sheets: 0.02 mm to 4.0 mm | Plates: 4.5 mm to 100 mm |
| Width | Sheets: 900 – 2400 mm | Plates: 900 – 2400 mm | Coils: 500 – 1200 mm |
| Length | Sheets: 3000 – 12000 mm | Plates: 3000 – 12000 mm |
| Hardness | Soft, Hard, Half Hard, Quarter Hard, Spring Hard |
| Surface finish | HR (Hot Rolled), CR (Cold Rolled), 2B, 2D, BA, NO(8), SATIN, Mirror, PVC Coated |
| Forms available | Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Foil, Blank (Circle), Ring (Flange), Coil |
| Cutting methods | Laser Cutting, Water Jet Cutting, Plasma Cutting, Mechanical Cutting, Oxy-Fuel Cutting |
SS 904L Chemical Composition (ASTM A240 / SA240)
| Grade | C (max) | Mn (max) | Si (max) | Cr | Mo | Ni | Cu |
|---|---|---|---|---|---|---|---|
| SS 904L | 0.020 | 2.00 | 1.00 | 19.00 – 23.00 | 4.00 – 5.00 | 23.00 – 28.00 | 1.00 – 2.00 |
SS 904L Mechanical Properties
| Density | Melting point | Tensile strength | Yield strength (0.2%) | Elongation |
|---|---|---|---|---|
| 7.95 g/cm³ | 1350 °C (2460 °F) | Psi 71,000 / MPa 490 | Psi 32,000 / MPa 220 | 35% |
ASTM A240 Type 904L Physical Properties
| Property | Value |
|---|---|
| Density (kg/m³) | 7900 |
| Elastic modulus (GPa) | 190 |
| Specific heat 0–100 °C (J/kg.K) | 500 |
| Electrical resistivity (nΩ.m) | 952 |
| Thermal conductivity at 20 °C (W/m.K) | 11.5 |
| Mean thermal expansion 0–100 °C (µm/m/°C) | 15 |
| Maximum service temperature | ~450 °C (842 °F) |
| Hardness (HRB) | 90 – 95 |
SS 904L International Equivalent Grades
| Standard | UNS | DIN / Werkstoff | JIS | EN | BS | AFNOR |
|---|---|---|---|---|---|---|
| SS 904L | N08904 | 1.4539 | SUS 904L | X1NiCrMoCu25-20-5 | 904S13 | Z2 NCDU 25-20 |
Stainless Steel 904L Sheets Price List
| Thickness (mm) | Indicative price (USD/kg) |
|---|---|
| 0.5 mm | US$ 2.21 |
| 1 mm | US$ 2.15 |
| 1.5 mm | US$ 3.01 |
| 2 mm | US$ 4.21 |
| 3 mm | US$ 3.09 |
| 4 mm | US$ 4.01 |
| 5 mm | US$ 4.00 |
| 6 mm | US$ 4.20 |
| 8 mm | US$ 5.89 |
Prices vary with market conditions, quantity, and specifications. Contact Aashish Metal & Alloys for the latest quote.
SS 904L vs SS 316L
| Property | SS 904L | SS 316L |
|---|---|---|
| Nickel content | 23 – 28% | 10 – 14% |
| Molybdenum content | 4 – 5% | 2 – 3% |
| Copper addition | 1 – 2% (key advantage) | None |
| Corrosion resistance | Superior — resists strong acids | Good — moderate environments |
| SCC resistance | Excellent | Moderate |
| Tensile strength | MPa 490 | MPa 485 |
| Elongation | 35% | 40% |
| Weldability | Good | Excellent |
| Typical applications | Pharma, chemical reactors, scrubbers | Food, marine, general industrial |
| Cost | Higher (premium alloy) | Lower |
SS 904L Surface Finish Guide
| Finish code | Max width (mm) | Description |
|---|---|---|
| 2B | 2032 | Cold rolled, heat treated, pickled, skin passed — standard industrial finish |
| 2D | 1524 | Cold rolled, heat treated, pickled — matte finish for forming applications |
| 2E | 2032 | Cold rolled, heat treated, mechanically descaled |
| BA | 1524 | Bright annealed — reflective finish used in decorative applications |
| 2H | 1524 | Work hardened — enhanced yield strength surface |
| Polished/Brushed | 1524 | Hairline (HL) or No.4 — hygienic surface for food and pharma |
Available Types & Forms of Stainless Steel 904L Sheets & Plate
SS 904L Shim Sheet
SS 904L Perforated Sheet
SS 904L Chequered Plate
SS 904L Hot Rolled Sheet
SS 904L Cold Rolled Plate
SS 904L Strips
SS 904L Foils
SS 904L Coils
Industries & Applications of SS 904L Plates & Sheets
SS 904L’s unique chemistry makes it the go-to grade for environments that would rapidly degrade standard stainless steels:
Chemical & Petrochemical Industry
- Scrubbers for coal-fired power plants and flue gas desulphurisation (FGD)
- Heat exchangers handling sulphuric acid
- Process vessels and reactors in aggressive chemical media
- Pipeline systems for corrosive liquids and slurries
Pharmaceutical & Biotech Industry
- Reactors, vessels, and piping in API manufacturing
- Cleaning-in-place (CIP) systems and storage tanks
- Sterile fluid transfer lines
Oil & Gas Industry
- Offshore production equipment in seawater environments
- Wellhead components and subsea hardware
- Sour gas service pipelines
Marine & Seawater Applications
- Desalination plant components
- Seawater cooling systems
- Marine heat exchangers and condensers
Pulp, Paper & Food Processing
- Digesters and bleaching tanks
- Process water treatment equipment
- Food-grade storage vessels requiring acid resistance
Power Generation
- Flue gas scrubber components
- Cooling water systems
- Nuclear and thermal power plant auxiliary systems
Quality Standards, Testing & Certifications
- Micro and macro structural analysis
- Chemical and mechanical property testing
- Hardness testing (Rockwell / Brinell / Vickers)
- Visual and dimensional inspection
- Third-party inspection (TPI) by approved agencies
- Hydrostatic testing for pressure-bearing applications
- Ultrasonic testing (UT) for internal defects
- Positive material identification (PMI) — 100%
- Radiography test report on request
- Mill Test Certificate (MTC) — EN 10204 3.1
- Commercial invoice and packing list
- Guarantee letter of the manufacturer
- Quality assurance plan documentation
- Fumigation certificate
- Third-party inspection statement
- NACE certified material documentation
| Standard | Equivalent / Corresponding Standard |
|---|---|
| ASME SA 240 | BS EN 10088-4 / EN 10088-1 |
| ASTM A240 | EN ISO 18286 |
| EN ISO 9445 | EN 10051 |
| ASME IID | BS EN 10028-7 |
| BS EN 10088-2 | ISO 15156 |
| ISO 15510 | NACE MR 0175 |
FAQs Stainless Steel 904L Sheets & Plates
SS 904L has a maximum continuous service temperature of approximately 450°C (842°F). Beyond this range, sensitisation may occur, reducing corrosion resistance. For higher temperature applications, grades such as 310S or Alloy 825 may be more appropriate.
No. SS 904L is highly resistant to both rusting and corrosion owing to its high nickel, chromium, molybdenum, and copper content. It offers significantly better corrosion resistance than standard grades like 304 or 316L, especially in acidic and chloride-rich environments.
SS 904L contains significantly higher nickel (23–28% vs 10–14%) and molybdenum (4–5% vs 2–3%) than 316L, plus an addition of copper (1–2%) absent in 316L. These differences give 904L far superior resistance to reducing acids, pitting, crevice corrosion, and stress corrosion cracking, though at a higher cost.
SS 904L can be welded using GTAW (TIG), GMAW (MIG), PLASMA, and SAW (Submerged Arc Welding). Its low carbon content minimises sensitisation during welding. Use of matching or over-alloyed filler metals such as ER385 (AWS A5.9) for matched composition or ER625 (Alloy 625) where additional overalloying is required for critical corrosion service is recommended for optimal corrosion resistance in welds.
The HSN code for SS 904L Sheet Metal is 72193390. This applies to flat-rolled products of alloy steel, of a width of 600 mm or more, cold-rolled, not clad, plated, or coated — specifically for stainless steel grades.
Yes. We provide a full cut-to-size service for SS 904L sheets and plates. Our facility handles laser cutting, water jet cutting, plasma cutting, and mechanical cutting to precise customer dimensions with lead times starting from 3–5 business days for standard requirements.
For More Information About Stainless Steel 904L Sheets & Plates please call +91-22-66362223 / 66394926 or send an email to export@aashishmetal.com
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