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Home > Our Products > Stainless Steel Plates > Grade / Standard > SS 904L – High Corrosion Resistance Stainless Steel Plates
Looking for a stainless steel plate that resists even the harshest chemical environments? SS 904L Plates are your solution. Hindustan Steel Corporation supplies premium-grade 904L stainless steel plates—UNS N08904 / WNR 1.4539—engineered for aggressive corrosion conditions such as sulfuric acid, phosphoric acid, seawater, and chloride-rich media. Whether you’re fabricating chemical tanks, scrubbers, or marine components, SS 904L gives you the power of longevity, strength, and global compliance in one plate.
SS 904L is a non-stabilized austenitic stainless steel alloy with low carbon and a high content of chromium (19–23%), nickel (23–28%), molybdenum (4–5%), and copper (1–2%). This unique composition gives it superior resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in acidic and chloride-bearing conditions.
Also known by its equivalents:
SS 904L plates meet international standards like ASTM A240 / ASME SA240, and are often chosen over 316L or Duplex grades for environments with high sulfuric acid content or marine exposure.
SS 904L stainless steel plates are widely trusted across industries where extreme corrosion resistance and high purity are non-negotiable:
Its performance is especially unmatched in acid processing units, chloride-laden atmospheres, and sea-facing fabrication work.
| Property | Value Range |
|---|---|
| Yield Strength (min) | 220 MPa (approx) |
| Tensile Strength | 490 – 710 MPa |
| Elongation (in 50mm) | ≥ 35% |
| Hardness (Brinell) | ≤ 220 HBW |
| Density | 8.0 g/cm³ |
| Modulus of Elasticity | ~190 GPa |
| Maximum Service Temp (Wet) | ~400°C |
| Magnetic Behavior | Non-magnetic in annealed condition |
SS 904L remains non-magnetic, tough, and structurally stable even under pressure, making it suitable for both cryogenic and elevated temperature service.
SS 904L plates conform to globally recognized standards, making them suitable for international procurement and project compatibility.
Standards Covered:
Equivalent Designations:
| Standard | Grade Name / Number |
|---|---|
| UNS | N08904 |
| DIN / EN | 1.4539 |
| AFNOR (France) | Z2NCDU25-20 |
| JIS (Japan) | SUS 890L |
| ISO | X1NiCrMoCu25-20-5 |
SS 904L is also considered austenitic superalloy with higher corrosion resistance than SS 316L or 317L, especially in acidic and chloride environments.
At Hindustan Steel Corporation, we stock SS 904L plates in custom and standard sizes to meet the demands of various industrial sectors.
Thickness & Dimensions
Standard Plate Dimensions
Tolerances: As per ASTM A480/A480M or buyer specification
Plates can also be cut to size for pressure vessels, reactor linings, tank bottom cladding, or machined components.
SS 904L plates are solution annealed at 1090–1175°C and then rapidly cooled (usually water quenched) to retain corrosion resistance and toughness.
Key Properties Post Heat Treatment:
Post-weld heat treatment is not required, but pickling and passivation are recommended to restore corrosion resistance after heavy fabrication.
While SS 904L is fully austenitic and weldable, it requires careful machining and fabrication practices due to its high alloy content:
Machining Tips:
Welding Advice:
Forming & Bending:
🔹 Trusted Exporter – Serving UAE, Vietnam, Europe, and Africa with custom orders
🔹 Mill-Tested Plates – Heat number traceability, lab-tested chemistry
🔹 Cut-to-Size Service – With minimal waste, faster jobsite deployment
🔹 Expertise in Acid-Resistant Applications – Sourcing and consultation for H₂SO₄, HCl, and seawater-grade uses
🔹 Ready Stock + Urgent Delivery – Bulk inventory for immediate dispatch
Whether you’re building a chemical reactor, chloride scrubber, or marine condenser, our 904L plates deliver reliability and long-term ROI.
SS 904L is often chosen over traditional grades due to its low carbon, high nickel/moly/copper content, and performance under harsh acids.
Popular Alternatives or Related Grades:
Suggested Use Case: Choose 904L over 316L or Duplex when acidic corrosion, weld integrity, and chloride pitting are major concerns.
At Hindustan Steel Corporation, we are trusted exporters of SS 904L plates to over 18+ countries, especially where acidic environments, marine atmospheres, or chloride-rich industries are prominent.
Key Export Markets:
Export Packaging Options:
We offer both FOB India port and CIF delivery to your dock, ensuring safe, certified, and ready-to-use stainless steel plate deliveries.
When to Choose SS 904L Over Other Grades?
| If You Need… | Choose 904L Because… |
|---|---|
| Resistance to Sulfuric / Phosphoric Acid | High copper and molybdenum provide acid shielding |
| Excellent weld integrity in tanks | Low carbon avoids carbide precipitation |
| Long life in chloride-rich environments | Resists pitting and crevice corrosion far better than 316L |
| Superior intergranular corrosion resistance | Remains stable even after welding |
| Marine exposure and bio-corrosive resistance | Withstands seawater, brine, and bacteria-rich zones |
Pro Tip: For critical industries like chemical process, fertilizer plants, and chloride scrubbing, SS 904L is a long-term investment with minimal replacement or maintenance
Every SS 904L stainless steel plate supplied by us comes with:
Mill Test Certificate (MTC) – EN 10204 3.1 / 3.2
Third-Party Inspection – BV, SGS, TUV, Lloyds on request
Compliance Certifications:
QC Documents:
Your documentation is pre-verified and shipment-ready for project bidding and EPC audits.
Yes, 904L has higher corrosion resistance, especially against strong acids and chlorides. It also performs better after welding due to its low carbon content.
As of July 2025, prices range between ₹260 to ₹390 per kg depending on size, thickness, finish, and quantity.
Approximate composition: 20% Cr, 25% Ni, 4.5% Mo, 1.5% Cu, <0.02% C, balance Fe. It is alloyed for high corrosion resistance.
Yes, it’s one of the most seawater-compatible stainless grades and resists pitting and bio-corrosion effectively.
No, 904L is a non-magnetic austenitic stainless steel even after cold working or welding.
Typically around 140–190 HB (Brinell), depending on the condition and finish.
Yes. It supports TIG, MIG, and SMAW welding without carbide precipitation or intergranular corrosion.
Technically yes, but due to its high cost, it is rarely used in food-grade applications. SS 304 and 316 are more common for food contact.
No. 904L is a fully austenitic stainless steel, unlike duplex steels which have a dual-phase structure.
Available in 2B, No.4, BA, and mirror polish depending on application – industrial or decorative.
Commonly between 3 mm and 100 mm. Thicker custom-cut plates available on request.
EN 1.4539 and ISO X1NiCrMoCu25-20-5 are the closest equivalents.
Yes, it offers good formability, though higher forces are required due to strength.
Yes. It is specifically designed to resist IGC, even after welding or high-temperature exposure.
Call to Action – Request Price + Datasheet
Looking to buy SS 904L stainless steel plates at competitive rates?
Request a Quick Quote – Send your size, quantity, and delivery location
Download the SS 904L Datasheet (PDF) – Including mechanical, chemical, and heat treatment properties
Need Fast Dispatch? – We have ready stock in standard sizes and cut-to-length formats
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+91-22-66159018
+91-9820944724
sales@hindustansteel.com hindustansteel1@gmail.com
390/392, Ground Floor, Shankar Mansion, S.V.P. Road, Mumbai – 400004, India
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+91-22-66159018
+91-9820944724
sales@hindustansteel.com hindustansteel1@gmail.com