ASTM B165/B165M Standard Specification for Nickel-Copper Alloy (UNS N04400) Seamless Pipe and Tube

 1. Scope  

- Covers seamless pipe and tube made from nickel-copper alloy UNS N04400 (commonly known as Alloy 400).  

- Applicable to general corrosion-resistant and heat-resistant applications, including condensers, heat exchangers, and other high-performance systems.  

- Two unit systems:  

  - B165: Inch-pound units.  

  - B165M: SI units (metric).  

 2. 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).  

 3. 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.  

 4. 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%                  |  

 5. Inspection and 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.  

 6. Certification and 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.  

 7. 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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