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904L Stainless Steel

Sheet, Pipe, Bar & Tube | ASTM A240 / A312 / A276

High-alloy austenitic stainless steel with exceptional resistance to strong acids and chloride environments. Stock in Europe, China, and Dubai.

Technical Details
Composition(%):
Chromium
19.0 – 23.0
Nickel
23.0 – 28.0
Molybdenum
4.0 – 5.0
Copper
1.0 – 2.0
Manganese
≤ 2.0
Silicon
≤ 1.0
Carbon
≤ 0.02
Iron
Balance
Mechanical Properties:
Yield Strength: ≥ 220 MPa
Tensile Strength: ≥ 490 MPa
Elongation: ≥ 35%
Hardness: ≤ 210 HB
Weldability: Excellent
Corrosion Resistance: Outstanding in acids
Price & Availability

Updated: July 2025

904L Plate / Sheet | Size: 1500 × 3000 mm | Thickness: 6 – 30 mm
REGION
ASTM
UNS
W.NR.
AVAILABILITY
PRICE(USD/KG)
Europe
A240
N08904
1.4539
1-2 weeks

8.9

China
A240
N08904
1.4539
In stock

5.9

Dubai
A240
N08904
1.4539
2-3 weeks

6.7

** All prices are EXW. MOQ applies. Ask for DDP quotes to your region.
REGION
ASTM
UNS
W.NR.
AVAILABILITY
PRICE(USD/KG)
Europe
A312
N08904
1.4539
Limited stock

10.4

China
A312
N08904
1.4539
1-2 weeks

6.8

Dubai
A312
N08904
1.4539
2-3 weeks

7.6

** All prices are EXW. MOQ applies. Ask for DDP quotes to your region.
REGION
ASTM
UNS
W.NR.
AVAILABILITY
PRICE(USD/KG)
Europe
A312
N08904
1.4539
Made-to-order

12.2

China
A312
N08904
1.4539
2-3 weeks

9.1

Dubai
A312
N08904
1.4539
2-3 weeks

10.2

** All prices are EXW. MOQ applies. Ask for DDP quotes to your region.
Minimum Order Guideline

Product Form Minimum Order

Plate / Sheet ≥ 500 KG
Welded Pipe ≥ 300 KG
Seamless Pipe ≥ 300 kg
Bar / Rod ≥ 200 kg
Mixed Orders ≥ USD 10,000

** Smaller trial lots available for approved buyers.

Beyond Certified: Introducing The Alloy360 VANTAGE™ Program

Includes Free Pre-Shipment Third-Party Inspection (PMI, Dimensional, Visual, Photos) by SGS / TÜV

We don’t just sell certified material. We re-certify it ourselves and then have an independent expert verify it. This is our definition of uncompromising integrity.

More about Alloy360 VANTAGE™
Quick Specs
Density: 8.00 g/cm³
Tensile Strength: >490 MPa
Max Temp: ~400°C
  • Certified 904L stainless available in plate, seamless pipe, welded tube, and bar.

Forms: Plate / Sheet / Welded Pipe / Seamless Pipe / Tube / Round Bar

Standards: ASTM A240, A312, A276

UNS: N08904

W.Nr.: 1.4539

Property

value

Grade
Stainless Steel 904L
UNS Number
N08904
Werkstoffnummer
1.4539
Common Forms
Plate, Seamless Pipe, Tube, Bar
Industry Standards
ASTM A240, A312, A276
Applications
Chemical Processing, Acid Plants, Heat Exchangers
Supply Locations
Europe, China, Dubai
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FAQs

Is 904L better than 316L for chemical applications?

Yes. 904L offers superior resistance to sulfuric acid, phosphoric acid, and other aggressive chemicals. It’s widely used where 316L fails due to localized corrosion.

Can 904L be welded easily?

Yes, it can be welded using common methods. Filler metals like ER385 (AWS A5.9) or 904L-specific grades are recommended to maintain corrosion resistance.

What is the difference between 904L and Duplex 2205?

904L is a high-nickel austenitic grade with excellent acid resistance. Duplex 2205 has higher strength and better stress corrosion resistance in chloride environments. Choose based on application (acid vs stress corrosion).

Is 904L approved for use in sulfuric acid plants?

Yes, 904L is one of the most commonly specified stainless steels for sulfuric acid handling due to its high molybdenum and copper content.

What are the typical delivery times for Duplex 2205 to GCC countries?

From Dubai stock: 5–10 working days (usually fastest option for standard sizes)
From China stock: 4–6 weeks (includes customs and shipping time)
For seamless pipe or custom dimensions: 6–8 weeks (usually made-to-order with longer lead times)

Testing & Certifications

Non-Destructive Testing (NDT):

UT
PMI / XRF
Hydrostatic Pressure (Pipes)

Destructive Testing (DT):

Tensile
Flattening / Bending
Hardness

Documentation:

• EN 10204 3.1 MTC – 3.2 on request
• Third-party inspection: SGS, BV, TUV
• NACE MR0175 / ISO 15156 certification available

Full traceability to batch and heat number for EPC compliance.

Smart Message

904L – Built for Acids
Designed for extreme environments containing sulfuric acid, phosphoric acid, and chlorides.
Better than 316L. Trusted where corrosion means failure.

904L ASTM Standards (UNS N08904)
904L is a superaustenitic stainless steel with excellent resistance to sulfuric acid, phosphoric acid, and chlorides — outperforming 316L & 317L in harsh environments.
ASTM A240 – Sheet, Plate, Strip

• For vessels, tanks, linings
• Annealed & pickled; HRAP / 2B / polished finish

ASTM A312 – Welded & Seamless Pipe

• For corrosive & pressure systems
• Hydrotested + NDT & mechanical tests

ASTM A276 – Bar, Rod

• For shafts, fasteners, machined parts
• Hot/Cold finished; polished or turned

Comparison: 904L vs Alternatives in Acid & Chloride Environments

Property

316L

317L

904L

Alloy 20

Type
Austenitic
Austenitic
Super-Austenitic
Super-Austenitic
Mo Content (%)
~2.0
~3.0–3.5
~4.5
~2.5–3.5
Cu Content (%)
~0
~0
1.0–2.0
3.0–4.0
PREN (Pitting Index)
~25
~30
~35
~38
Resistance to H₂SO₄
Low
Moderate
High
Very High
Chloride Resistance
Moderate
Good
High
High
Cost
Low
Moderate
High
High
Common Applications
General
Marine, Pharma
Acid Plants
Fertilizer, ChemProc

Comparison: 904L vs Alternatives in Acid & Chloride Environments

Property

316L

Type
Austenitic
Mo Content (%)
~2.0
Cu Content (%)
~0
PREN (Pitting Index)
~25
Resistance to H₂SO₄
Low
Chloride Resistance
Moderate
Cost
Low
Common Applications
General

Property

317L

Type
Austenitic
Mo Content (%)
~3.0–3.5
Cu Content (%)
~0
PREN (Pitting Index)
~30
Resistance to H₂SO₄
Moderate
Chloride Resistance
Good
Cost
Moderate
Common Applications
Marine, Pharma

Property

904L

Type
Super-Austenitic
Mo Content (%)
~4.5
Cu Content (%)
1.0–2.0
PREN (Pitting Index)
~35
Resistance to H₂SO₄
High
Chloride Resistance
High
Cost
High
Common Applications
Acid Plants

Property

Alloy 20

Type
Super-Austenitic
Mo Content (%)
~2.5–3.5
Cu Content (%)
3.0–4.0
PREN (Pitting Index)
~38
Resistance to H₂SO₄
Very High
Chloride Resistance
High
Cost
High
Common Applications
Fertilizer, ChemProc

Related Grades

Explore similar and complementary alloys:

316L Stainless Steel – Standard corrosion-resistant austenitic

Duplex 2205 – Stronger, with better SCC resistance

Super Duplex 2507 – For extreme chloride and pressure conditions

347 / 347H – Stabilized high-temp stainless for pressure vessels

 

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