Ordering Information
- 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)
Material Codes (UNS Alloys)
| UNS Code | Alloy Type | Key Feature |
|---|---|---|
| N06025 | Ni-Cr-Fe-Mo-Cu | High-performance alloy |
| N06045 | Ni-Cr-Fe-Si | Silicon-enhanced alloy |
| N06600 | Nickel-Chromium-Iron | General-purpose Most Common |
| N06601 | Ni-Cr-Fe | Improved high-temperature strength |
| N06603 | Ni-Cr-Fe | Oxidation-resistant |
| N06690 | Ni-Cr-Fe (low-carbon) | Corrosion-resistant Nuclear Grade |
| N06693 | Ni-Cr-Fe-Al | High-temperature resistant |
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.
Mechanical Properties
- Tensile strength, yield strength, elongation requirements vary by alloy and condition (annealed / cold-worked).
📌 Example — N06600 (Annealed)
≥80 ksi
Tensile Strength
(550 MPa)
(550 MPa)
≥35 ksi
Yield Strength
(240 MPa)
(240 MPa)
≥30%
Elongation
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
Surface Finish & Dimensions
- Surfaces must be free of scale, cracks, and imperfections.
- Dimensional tolerances for OD, wall thickness, and length are specified.
Certification & Marking
- Marking: ASTM standard, alloy, heat number, size, and manufacturer's identification.
- Certification: Supplier must provide compliance documentation.
Keywords
Nickel Alloys
Seamless Pipe
Corrosion-Resistant
High-Temperature
UNS N06600
UNS N06690
ASTM B167
ASTM B167M
⚠ 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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❓ Frequently Asked Questions
Q What is ASTM B167 / B167M and what does it cover?
ASTM B167 / B167M is the standard specification for seamless pipe and tube made from nickel-chromium-iron alloys. It covers a range of UNS alloys including N06600, N06601, N06603, N06690, N06693, N06025, and N06045, used in high-temperature and corrosive service environments.
Q Which alloy is most commonly specified under ASTM B167?
UNS N06600 (Nickel-Chromium-Iron) is the most widely used alloy under ASTM B167. It is a general-purpose alloy suitable for a broad range of high-temperature and corrosive applications across industries such as chemical processing, heat treating, and power generation.
Q What mechanical properties are required for N06600 in the annealed condition?
For UNS N06600 in the annealed condition, ASTM B167 requires a minimum tensile strength of 80 ksi (550 MPa), a minimum yield strength of 35 ksi (240 MPa), and a minimum elongation of 30%.
Q What testing and inspection methods are required under ASTM B167?
ASTM B167 requires chemical analysis per heat/lot, tensile testing per lot, hydrostatic or nondestructive testing (such as eddy current testing) for leak and defect detection, dimensional checks, and visual surface inspection. Mill Test Reports (MTRs) must also be provided by the supplier.
Q Why is UNS N06690 preferred for nuclear applications?
UNS N06690 is a low-carbon nickel-chromium-iron alloy with excellent resistance to stress corrosion cracking, which is critical in nuclear environments. Its low carbon content minimizes carbide precipitation, making it particularly suitable for steam generator tubing and other nuclear-grade applications.
Q What information must be provided when placing an order for ASTM B167 pipe or tube?
When ordering ASTM B167 seamless pipe or tube, buyers must specify the ASTM designation (B167 or B167M), the alloy UNS number, required dimensions (OD, wall thickness, and length), material condition (annealed or cold-worked), any additional test requirements, certification needs, and any special packaging instructions.