ASTM 904L Stainless Steel Pipe
We offer this product and related grades with 100% factory direct pricing and free quotes available within 24 hours.
APPLICATION SCENARIOS
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904L is a super-austenitic, low-carbon, high-molybdenum alloy designed to withstand sulfuric, phosphoric, and acetic acids where standard 316L fails. With 23% chromium, 4.5% molybdenum, and 1.6% copper, it delivers:
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Exceptional pitting/crevice corrosion resistance (PREN ≥36)
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Immunity to stress corrosion cracking (SCC)
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Superior performance in reducing acids
Our pipes comply with ASTM A312, A789, EN 10216-5 and carry NACE MR0175 certification.
Why Choose Luokaiwei’s 904L Pipes?
| Advantage | Technical Benefit | Cost Impact |
|---|---|---|
| Extreme Corrosion Resistance | PREN ≥36 vs. 316L’s PREN 24; handles chlorides ≤60°C | Reduces replacement costs by 70% |
| Acid Compatibility | Resists sulfuric (≤50%), phosphoric, acetic acids | Eliminates need for expensive nickel alloys |
| Non-Magnetic | Stable austenitic structure (no cold-work magnetism) | Critical for MRI/lab equipment |
| Weldability | Low carbon (0.02% max) prevents carbide precipitation | No post-weld annealing required |
| Bio-Pharma Compliance | Passes ASTM A967 passivation; electropolishing ready | Meets FDA/EMEA cleanability standards |
Technical Specifications
Table 1: Chemical Composition (Weight %)
| Element | 904L (N08904) | 316L (S31603) | Function |
|---|---|---|---|
| Chromium (Cr) | 19.0–23.0 | 16.0–18.0 | Passive layer formation |
| Molybdenum (Mo) | 4.0–5.0 | 2.0–3.0 | Chloride resistance |
| Nickel (Ni) | 23.0–28.0 | 10.0–14.0 | Austenite stability |
| Copper (Cu) | 1.0–2.0 | - | Reducing acid resistance |
| Carbon (C) | ≤0.02 | ≤0.03 | Prevents sensitization |
Table 2: Mechanical Properties
| Property | 904L | 316L | Alloy 825 |
|---|---|---|---|
| Yield Strength (MPa) | ≥220 | ≥170 | ≥310 |
| Tensile Strength (MPa) | ≥490 | ≥485 | ≥586 |
| PREN (Cr+3.3Mo+16N) | 36–39 | 24–26 | 32–35 |
| Max H₂SO₄ Conc. (°C) | 50% @ 40°C | 20% @ 30°C | 60% @ 90°C |
Key Applications
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Chemical Processing:
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Sulfuric acid reactors, phosphoric acid evaporators
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Acetic anhydride transfer lines
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Pharmaceutical:
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API synthesis vessels, CIP/SIP systems
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High-purity water distribution
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Offshore Oil & Gas:
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Seawater piping, chloride-containing crude systems
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Pollution Control:
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FGD scrubbers, waste acid recovery units
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Luokaiwei’s Manufacturing Process
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Material Sourcing: Virgin 904L billets from EU/Japan mills (Outokumpu, Nippon Steel)
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Pipe Formation:
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Seamless: Hot extruded (OD 1/8"–24", SCH 5S–160)
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Welded: TIG/Laser welded (OD 24"–60", wall 0.5–30mm)
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Solution Annealing: 1100–1170°C rapid quench
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Surface Treatment:
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Pickling + Electropolishing (Ra ≤0.5 μm for pharma)
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Bead blasting (#4 finish) for architectural use
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Testing:
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Hydrostatic/Eddy current testing
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IGC testing per ASTM A262 Practice E
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PMI verification with EN 10204 3.2 certification
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Fabrication Guidelines
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Welding:
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Filler: ER385 or ENiCrMo-3
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Gas: 98% Ar + 2% N₂ (back purging mandatory)
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Heat Input: ≤1.0 kJ/mm
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Cold Working:
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Bend radius ≥3× OD
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Anneal after >15% deformation
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Avoid:
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Contact with carbon steel (risk of iron contamination)
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Temperatures 550–850°C (sigma phase formation)
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5 Critical FAQs
Q1: Can 904L replace Hastelloy in sulfuric acid service?
A: Yes for ≤50% H₂SO₄ at ≤40°C. Beyond this, use Hastelloy B-3. We provide corrosion test data for specific media.
Q2: Is 904L suitable for seawater applications?
A: Excellent for temperatures ≤60°C. For hotter chlorides (e.g., heat exchangers), upgrade to 6Mo alloys like AL-6XN®.
Q3: Do you supply pharmaceutical-grade electropolished pipes?
A: Yes. Our 904L pipes achieve Ra ≤0.38 μm, certified to ASME BPE-2022 standards with full traceability.
Q4: What certifications accompany your pipes?
A: Standard delivery includes:
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EN 10204 3.2 Material Certificate
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NACE MR0175 (Sour Service)
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ASTM A312/A789 Compliance
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Third-party PMI reports
Q5: How does 904L compare to duplex 2205?
| Parameter | 904L | 2205 Duplex |
|---|---|---|
| Corrosion Resistance | Superior in reducing acids | Better in chlorides |
| Strength | 220 MPa yield | 640 MPa yield |
| Cost | Higher (Ni/Cu content) | 30% more economical |
Why Partner with Luokaiwei?
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Global Supply: 5,000+ tons annual production capacity
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Custom Solutions: U-bends, jacketed pipes, threaded ends
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Quality Assurance:
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Automated UT testing for 100% weld inspection
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On-site metallurgical lab (spectrometer, hardness tester)
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Sustainability: 70% recycled content in raw materials
Order Now for Industry-Leading Performance!
✅ 24/7 Technical Support
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Contact:
📧 sales@luokaiweipipe.com
📱 +86 18912200505
