ASME B16.5 A182 UNS N08904 Flange
ASME B16.5 A182 UNS N08904 Flange is an ideal choice for moderately corrosive environments, offering excellent cost-performance in chloride-containing, dilute sulfuric acid, and organic acid applications.
High Quality ASME B16.5 A182 UNS N08904 Flange
- Pressure Rating: ASME B16.5 flanges are available in pressure classes 150, 300, 600, 900, 1500, and 2500.
- Size Range: Flanges are typically available from 1/2″ to 24″ in diameter.
- Standard: The flange follows ASME B16.5 specifications for bolt holes, dimensions, and tolerances.
- Temperature Range: Suitable for temperatures up to 870°C.
ASME B16.5 A182 UNS N08904 Flange
The ASME B16.5 standard covers various flange designs, including:
- Weld Neck Flange: Preferred for high-pressure systems, connected via welding.
- Slip-On Flange: Easy installation, suitable for low-pressure applications.
- Blind Flange: Used to seal pipe ends.
- Threaded Flange: Connected via threads, eliminating the need for welding.
- Lap Joint Flange: Paired with stub ends for easy disassembly.
Material Properties (ASME B16.5 A182 UNS N08904)
Composition:
- Chromium (Cr) 19–23%, Nickel (Ni) 23–28%, Molybdenum (Mo) 4–5%, Copper (Cu) 1–2%, Iron (Fe) balance.
Key Properties:
Corrosion Resistance:
- Resistant to sulfuric acid, phosphoric acid, and chloride-containing media (e.g., seawater, chloride solutions).
- Withstands dilute hydrochloric acid and organic acids (e.g., acetic acid).
Mechanical Performance:
- Tensile strength ≥490 MPa, yield strength ≥220 MPa, operating temperature range -50°C to 300°C.
Selection Guidelines
Pressure-Temperature Ratings:
- Refer to ASME B16.5 Appendix D, e.g.:
- Class 150 flange at 100°C allows ≈1.8 MPa.
- Class 300 flange at 200°C allows ≈5.2 MPa.
Sealing Solutions:
- RF Face: Use PTFE or flexible graphite gaskets (acid-resistant).
- RTJ Face: Choose soft iron or 304 stainless steel ring gaskets.
Welding Process:
- Filler metal: ER385 (AWS A5.9 standard).
- Interpass temperature must be controlled ≤150°C to avoid carbide precipitation.
Typical Applications
- Chemical: Sulfuric acid storage tanks, phosphoric acid reactors.
- Marine: Seawater cooling systems, ship pipelines.
- Environmental: Chloride-containing wastewater treatment equipment.
- Food/Pharmaceutical: High-purity media transport (requires surface polishing).
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More Information about ASME B16.5 A182 UNS N08904 Flange
ASME B16.5
Purpose: A universal specification for pipe flanges established by the American Society of Mechanical Engineers (ASME), defining dimensions, pressure ratings (Class 150–2500), sealing face types (e.g., RF/RTJ), and pressure-temperature ratings.
Scope: Applicable to flanges ranging from NPS ½” to 24″, serving industries such as chemical, petroleum, and pharmaceutical.
ASTM A182
Material Standard: Covers requirements for stainless steel and nickel alloy forgings for high-temperature service. UNS N08904 (904L) is a highly corrosion-resistant austenitic stainless steel under this standard.
Cost Optimization Suggestions
Alternatives:
- 316L Stainless Steel: 60% lower cost, suitable for mild corrosion environments (Cl⁻ <2,000 ppm).
- Duplex Steel (e.g., 2205): Better chloride resistance but similar cost; requires trade-offs in ductility.
Cost-Saving Pitfalls:
- Avoid “fake 904L” (e.g., substandard high-manganese steel)—verify molybdenum (Mo≥4%) and copper (Cu≥1%) content.
Pressure–Temperature Ratings for A182 Gr.UNS N08904
Comparison with Other Materials
| Property | 904L (N08904) | 316L | 6% Mo Steel (e.g., 254 SMO) |
| Sulfuric Acid Resistance (dilute) | Excellent (≤40% concentration) | Fair (≤15% concentration) | Excellent (≤60% concentration) |
| Chloride Corrosion Resistance | Resists pitting (Cl⁻ ≤5,000 ppm) | Resists pitting (Cl⁻ ≤2,000 ppm) | Resists pitting (Cl⁻ ≤10,000 ppm) |
| Hydrochloric Acid Resistance | Limited (only dilute) | Not suitable | Limited (dilute) |
| Cost | High (~3x 316L) | Low | Highest (~1.5x 904L) |
FAQ
- Its high nickel (25%) and copper (1.5%) content enhance resistance to dilute sulfuric acid and reducing media.
No! 904L’s corrosion rate spikes in >40% concentration or >50°C sulfuric acid—upgrade to Hastelloy C276.
- Three-step verification:
- Spectrometry: Confirm Cr≥20%, Ni≥23%, Mo≥4%.
- Corrosion Test: Immerse in 5% sulfuric acid + 1% NaCl solution for 48 hours; weight loss should be <0.1 mm/year.
- Certification Check: ASTM A182 + EN 10088-3 dual certification.
For further details or technical assistance, please provide your specific operational conditions, such as medium type, temperature, and pressure, as well as any required certifications.
📞 Technical Support: Available for material selection consultation and rapid quotations!
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