Stainless Steel 904L Plate Specifications

The table below lists key specifications for SS 904L plates per ASTM A240 / ASME SA240.

Property Details
Standard ASTM A240 / ASME SA240, ASTM B625 / ASME SB-625
Thickness 4.8 mm (3/16″) to 50.8 mm (2″)
Width Up to 2500 mm (96″)
Length Up to 6000 mm (240″)
Standard Sizes 1000×2000, 1220×2440, 1500×3000, 2000×2000, 2000×4000 mm
Surface Finish No. 1, 2B, 2D, BA, No. 4 (brushed), 8K (mirror), hairline, satin
Forms Hot rolled, cold rolled, chequered, perforated, clad, coils/strips
Delivery Condition Solution annealed and pickled

Alloy 904L Plate Standard Size Chart

Refer to the following tables for the standard dimensional availability and thickness specifications for 904L Stainless Steel Plates.

Dimension Parameter Metric Range (mm) Imperial Range (inch/ft)
Thickness Range 4.8 mm – 50.8 mm 3/16" – 2.00"
Standard Widths 1000, 1219, 1500, 2000, 2500 mm 36", 48", 60", 80", 96"
Standard Lengths 2000, 2438, 3048, 6000 mm 6.5 ft, 8 ft, 10 ft, 20 ft
Common Plate Sizes 1219 x 2438 / 1500 x 6000 mm 4' x 8' / 5' x 20'
Tolerances ASTM A480 / ASME SA480 —

Plate Thickness & Weight Chart

Refer to the table below for precise plate thickness measurements and corresponding weight calculations per square metre.

Thickness (mm) Thickness (inch) Weight (kg/m²) Weight (lb/ft²)
5.0 mm 0.197" 40.0 kg 8.20 lb
6.0 mm 0.236" 48.0 kg 9.83 lb
8.0 mm 0.315" 64.0 kg 13.11 lb
10.0 mm 0.394" 80.0 kg 16.39 lb
12.0 mm 0.472" 96.0 kg 19.66 lb
20.0 mm 0.787" 160.0 kg 32.77 lb

SS 904L Plate Surface Finishes

Refer to the following list to identify the standard surface finishes available for alloy 904L plates.

  • No. 1 (Hot Rolled, Annealed, and Pickled)
  • 2B (Cold Rolled, Bright)
  • 2D (Cold Rolled, Dull)
  • BA (Bright Annealed)
  • No. 4 (Brushed / Satin)
  • 8K (Mirror Finish)

Stainless Steel 904L Plate Price

Global SS 904L pricing shifts with market nickel rates and specific standards like A240. Locally, Indian plates cost roughly ₹650–₹1,100 per kg. In the USA, Stainless Steel 904L plate prices generally range from $12.50 to $16.00 per kg ($5.60–$7.25 per lb). The thickness, finish, and size of your purchase all affect the ultimate bill. Premium finishes or thicker dimensions usually make the price go up. Call our specialised sales staff to get an exact and up-to-date price for your project.

Chemical Composition of Stainless Steel 904L Plates

SS 904L chemical composition per ASME SA240 (2023 edition) is listed below. High nickel and molybdenum content give the alloy its corrosion properties.

Carbon C
Max 0.020%
Manganese Mn
Max 2.00%
Phosphorus P
Max 0.045%
Sulfur S
Max 0.035%
Silicon Si
Max 1.00%
Chromium Cr
19.0 – 23.0%
Nickel Ni
23.0 – 28.0%
Molybdenum Mo
4.0 – 5.0%
Copper Cu
1.0 – 2.0%

Mechanical Properties of 904L Stainless Steel Plates

Grade 904L plates per ASME SA240 meet the following minimum mechanical property requirements. These values apply to the solution-annealed plates in thicknesses up to 50.8 mm.

490 (71)
MPa (ksi)
Tensile Strength
215 (31)
MPa (ksi)
Yield Strength
35%
(min)
Elongation
70–90
HRB
Hardness
Property Details Unit
Tensile Strength (min) 490 (71) MPa (ksi)
Yield Strength (min) 215 (31) MPa (ksi)
Elongation (min) 35 %
Hardness (typical) 70–90 HRB
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Equivalent Grades for 904L Stainless Steel

ASTM A240 Grade 904L is recognised under multiple international designations. Buyers referencing European, Japanese, or British standards can cross-check equivalence below.

Property Details
USA UNS N08904
Europe (EN/DIN) 1.4539 / X1NiCrMoCu25-20-5
Japan (JIS) SUS 890L
UK (BS) BS 904S13
France (AFNOR) Z2 NCDU 25-20

Common trade names include 2RK65 and Uranus B6. All designations refer to the same super austenitic chemistry with identical corrosion properties.

Industrial Applications of Stainless Steel 904L Plates

Grade 904L plates find use across 5 primary sectors: chemical processing, oil and gas production, marine systems, pharmaceutical manufacturing, and air pollution control.

Chemical Processing Industry

Used in industrial storage tanks and heat exchangers that handle strong acids like acetic acid or sulfuric acid.

Oil and Gas Production

Subsea infrastructure and offshore facilities utilise 904L plates in process vessels specifically to resist chloride-laden produced water and corrosive sour gas streams.

Marine and Seawater Systems

Seawater condensers, desalination units, and cooling water systems rely on 904L's resistance to pitting and crevice corrosion in high-chloride marine environments.

Pharmaceutical Manufacturing

Used in mixing vats and sterile containers to ensure medicine stays pure and free from metallic contamination.

Air Pollution Control

Flue gas desulphurisation (FGD) scrubbers in coal-fired power plants use 904L plates to handle acidic condensate and chloride-laden flue gas.

Stainless Steel 904L vs. 316L Plate Comparison

Refer to the following comparison table to evaluate the chemical and performance advantages of Alloy 904L over SS 316L plates.

Feature SS 904L (Super Austenitic) SS 316L (Standard Marine)
Nickel (Ni) Content 23.0% – 28.0% 10.0% – 14.0%
Molybdenum (Mo) 4.0% – 5.0% 2.0% – 3.0%
Copper (Cu) Addition 1.0% – 2.0% (Added) None
Pitting Resistance (PREN) ~35 (High) ~24 (Moderate)
Acid Resistance Excellent (Sulfuric/Phosphoric) Moderate
SCC Resistance Very High Moderate
Relative Cost Significant Premium Standard / Economical

High-alloy austenitic stainless steel SS 904L has low carbon content and is suitable for harsh corrosion conditions such as dilute sulphuric acid. Copper strengthens its resistance to strong reducing acids. Ideal for chemical processing and refinery equipment, it has outstanding weldability and formability and is non-magnetic in all situations.

Shipping & Packaging of Stainless Steel 904L Plates

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect SS 904L plate from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Edge and corner protection with plastic padding
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Plate Bundle Yard Staging
Shipping packaging Plate Bundle Edge Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies stainless steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

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Frequently Asked Questions:

What sizes are available for Stainless Steel 904L Plates? +
SS 904L plates are available in thicknesses from 4.8 mm (3/16″) to 50.8 mm (2″), widths up to 2500 mm, and lengths up to 6000 mm. Standard sheet sizes include 1000×2000 mm and 1500×3000 mm. Custom cut-to-size plates can be produced as per client's specification.
What is the price of SS 904L Plates per kg? +
Indicative pricing in India is ₹650 to ₹1,100 per kg and $12.50 to $16.00 per kg in the USA. Final price depends on plate thickness, dimensions, finish, specification, and order quantity. Request a quote for current rates.
How do 904L Plates compare to 316L Plates? +
Sulphuric and phosphoric acids require the superior resistance of 904L, which contains 4.0–5.0% molybdenum and 23–28% nickel. Compared to 316L’s weaker specs, 904L handles chloride stress cracking far better. While more expensive, this higher alloy content is necessary for aggressive environments where 316L cannot survive. Choose it for reliability.
Can 904L Stainless Steel Plates be welded? +
Yes. 904L plates can be welded using GTAW (TIG), GMAW (MIG), and SMAW methods with matching filler metals such as AWS ERNiCrMo-3. Post-weld heat treatment isn't required. Keep heat input low to preserve the alloy's corrosion resistance in the heat-affected zone.
Is 904L Stainless Steel Plate magnetic? +
Annealed 904L maintains a completely austenitic microstructure. This non-magnetic characteristic makes the alloy ideal for specialised applications requiring high-permeability control and non-magnetic plating.
What are the disadvantages of 904L Stainless Steel Plates? +
The primary drawback is cost. 904L plates are more expensive than 316L and 304 plates because of their high nickel (23–28%) and molybdenum (4–5%) content. The alloy also can't be hardened by heat treatment. That said, in environments with concentrated sulphuric acid or aggressive chlorides, 904L's longer service life offsets the upfront premium.

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