ASTM B167/B167M Standard Specification for Nickel-Chromium-Iron Alloys (UNS N06600, N06601, N06603, N06690, N06693, N06025, and N06045) Seamless Pipe and Tube

 1. Scope  

This standard covers seamless pipe and tube made of nickel-chromium-iron alloys (e.g., UNS N06600, N06601, N06690) for high-temperature and corrosive service. It includes mechanical properties, dimensions, and testing requirements.

 2. Ordering Information  

Buyers must specify:  

- ASTM designation (B167 or B167M for metric)  

- Alloy UNS number (e.g., N06600)  

- Dimensions (OD, wall thickness, length)  

- Condition (annealed, cold-worked, etc.)  

- Test requirements (if additional to standard)  

- Certification (if needed)  

- Special packaging (if required)  

 3. Material Codes (UNS Alloys)  

Common alloys covered:  

- N06600 (Ni-Cr-Fe, general-purpose)  

- N06601 (Higher temperature resistance)  

- N06690 (Improved corrosion resistance)  

- Others: N06603, N06693, N06025, N06045.  

 4. Chemical Composition  

- Limits for Ni, Cr, Fe, C, Mn, Si, Cu, S, and other trace elements are specified for each alloy.  

- Material analysis must conform to ASTM E1473 or equivalent.  

 5. Mechanical Properties  

- Tensile strength, yield strength, elongation requirements vary by alloy and condition (annealed/cold-worked).  

  - Example (N06600, annealed):  

    - Tensile: ≥80 ksi (550 MPa)  

    - Yield: ≥35 ksi (240 MPa)  

    - Elongation: ≥30%  

 6. Inspection & Testing Requirements  

- Chemical analysis (per heat/lot).  

- Tensile testing (per lot).  

- Hydrostatic or nondestructive testing (e.g., eddy current) for leaks/defects.  

- Dimensions and visual inspection (surface defects, straightness).  

- Certification: Mill test reports (MTRs) must comply with the standard.  

 7. Surface Finish & Dimensions  

- Surfaces must be free of scale, cracks, and imperfections.  

- Dimensional tolerances for OD, wall thickness, and length are specified.  

 8. Certification & Marking  

- Marking: ASTM standard, alloy, heat number, size, and manufacturer’s identification.  

- Certification: Supplier must provide compliance documentation.  

 9. Keywords  

Nickel alloys, seamless pipe, corrosion-resistant, high-temperature, UNS N06600, N06690.  

 Material Codes (UNS Alloys) in ASTM B167/B167M  

1. N06025 (Ni-Cr-Fe-Mo-Cu alloy)  

2. N06045 (Ni-Cr-Fe-Si alloy)  

3. N06600 (Nickel-Chromium-Iron, general-purpose alloy)  

4. N06601 (Nickel-Chromium-Iron, improved high-temperature strength)  

5. N06603 (Nickel-Chromium-Iron, oxidation-resistant)  

6. N06690 (Nickel-Chromium-Iron, low-carbon, corrosion-resistant)  

7. N06693 (Nickel-Chromium-Iron-Aluminum, high-temperature resistant)  

 Key Notes:  

- N06600 is the most common alloy in this standard, widely used in high-temperature and corrosive environments.  

- N06690 is often used in nuclear applications due to its low carbon content.  

- N06601 & N06693 offer enhanced oxidation resistance at elevated temperatures.  

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