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01
ASTM B165/B165M Standard Specification for Nickel-Copper Alloy (UNS N04400) Seamless Pipe and Tube
Ordering Information
Orders must specify:
- ASTM designation (B165 or B165M) and year of issue.
- Dimensions (outer diameter, wall thickness, length).
- Temper (e.g., annealed, cold-worked).
- Surface finish (e.g., pickled, polished).
- End finish (e.g., plain, beveled).
- Certification/Test Reports (if required).
- Additional testing (e.g., hydrostatic, nondestructive testing).
Material and Chemical Composition
- Alloy UNS N04400:
- Nickel (Ni): ≥63.0%.
- Copper (Cu): 28.0–34.0%.
- Iron (Fe): ≤2.5%.
- Manganese (Mn): ≤2.0%.
- Carbon (C): ≤0.3%.
- Silicon (Si): ≤0.5%.
- Sulfur (S): ≤0.024%.
- Trace elements limited to avoid detrimental effects.
Mechanical Properties
Requirements vary by temper (annealed vs. cold-worked):
| Property | Annealed (Typical) | Cold-Worked (Typical) |
| Tensile Strength | ≥70 ksi (485 MPa) | ≥90 ksi (620 MPa) |
| Yield Strength | ≥25 ksi (170 MPa) | ≥65 ksi (450 MPa) |
| Elongation | ≥35% | ≥15% |
Inspection & Testing Requirements
- Chemical Analysis: Performed to verify composition (ASTM E1473 or equivalent).
- Mechanical Testing: Tensile tests per ASTM E8/E8M.
- Hydrostatic Testing: Optional; pressure specified by purchaser.
- Nondestructive Testing (NDT): Eddy current or ultrasonic testing if required.
- Visual Inspection: Surface imperfections must not exceed specified limits.
Certification & Marking
- Certification: Manufacturer must provide a Certificate of Compliance with test results.
- Marking: Each tube/pipe must be marked with:
- ASTM standard (B165/B165M).
- Alloy (UNS N04400).
- Heat number.
- Size and temper.
- Manufacturer’s name or trademark.
Keywords
- Nickel-copper alloy, UNS N04400, Alloy 400, seamless pipe, seamless tube, corrosion-resistant, heat-resistant.
The primary material designation in this standard is:
UNS N04400
Common Names:
- Alloy 400 (generic industry name)
- Monel 400 (trade name, originally from Special Metals Corporation)
Werkstoff Number (European): 2.4360
Other Equivalent Standards:
- EN: NiCu30Fe (EN 2.4360)
- ISO: NiCu30Fe
- ASME SB165: Same as ASTM but for ASME Boiler and Pressure Vessel Code applications.
Key Characteristics of UNS N04400 (Alloy 400)
- Composition:
- Ni (Nickel): ≥63%
- Cu (Copper): 28–34%
- Fe (Iron): ≤2.5%
- Mn (Manganese): ≤2.0%
- C (Carbon): ≤0.3%
- Corrosion Resistance: Excellent in seawater, acids, and alkaline environments.
- Applications: Used in marine, chemical processing, heat exchangers, and oil & gas industries.
Summary of Material Codes
| Standard | Material Designation | Common Names |
| ASTM B165/B165M | UNS N04400 | Alloy 400, Monel 400 |
| EN (Europe) | 2.4360 | NiCu30Fe |
| ISO | NiCu30Fe | – |
| ASME SB165 | UNS N04400 | Same as ASTM |
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