What documentation standards apply to b167 ni-cr-fe alloy tube for nuclear applications?

When a B167 Ni-Cr-Fe alloy tube is destined for nuclear service, the paperwork matters just as much as the metallurgy. Nuclear regulators and plant owners do not accept a tube simply because it was made to a recognised standard. They require proof, in the form of a defined set of documents, that every heat of material was melted, processed, tested, and certified to the correct code edition. This article explains which documentation standards apply to B167 Ni-Cr-Fe alloy tube for nuclear applications, what each document must show, and how to check that a package is complete before it reaches your project.

The product standard itself: ASTM B167 and ASME SB-167

The starting point is the product specification. ASTM B167 covers seamless pipe and tube in nickel-chromium-iron alloys, including UNS N06600 (Alloy 600), N06601 (Alloy 601), and N06690 (Alloy 690), in cold-worked, hot-worked, and hot-finished conditions. It defines the chemical composition limits, mechanical property requirements, dimensional tolerances, hydrostatic testing, and product marking for each grade.

For pressure-retaining components built to the ASME Boiler and Pressure Vessel Code, the identical specification is adopted as ASME SB-167 in Section II, Part B. This is the version that appears on the material certificate for code-stamped nuclear equipment. A tube supplied to ASTM B167 can carry the SB-167 designation, but the documentation must state which edition and year of the standard was used, because code editions change and the applicable edition is fixed by the project specification.

Nuclear construction codes that govern the documentation

The base standard alone is not enough. The documentation requirements for nuclear service come from the construction code that governs the component. Two codes dominate the market for Ni-Cr-Fe alloy tubing:

ASME BPVC Section III (Nuclear Facility Components) sets out the material, testing, and documentation rules for Class 1 (Subsection NB), Class 2 (Subsection NC), and core support (Subsection NG) components. It requires material certificates, traceability from melt to finished product, and quality assurance records that meet the criteria of 10 CFR 50 Appendix B.
RCC-M, the French nuclear code, plays the same role for PWR projects designed to French practice. Its Section II defines the rules for sourcing, testing, and certifying nuclear-grade metal materials, and it is the reference used for RCC-M Section II nuclear tube supplied to European and export reactor programmes.

Whichever code applies, the practical consequence is the same: the supplier must produce a documentation package that proves the material meets the code edition, the grade, and the project specification, with every document traceable to a specific heat number.

Quality assurance frameworks behind the documents

The documents themselves sit on top of a quality assurance system. For nuclear work, the relevant frameworks include 10 CFR 50 Appendix B (the U.S. NRC quality assurance criteria), ASME NQA-1 (quality assurance requirements for nuclear facility applications), and, for suppliers supporting the supply chain, ISO 9001. These frameworks define how records are created, reviewed, approved, and retained, and they are what give the certificate its legal weight. When you buy nuclear-grade tubing, you are effectively buying a documented quality system as much as a physical product.

The core documentation set for B167 nuclear tube

A complete package for B167 Ni-Cr-Fe alloy tube in nuclear service typically contains the following documents:

Mill test certificate (MTC) issued to EN 10204 Type 3.1 (manufacturer-certified) or Type 3.2 (certified by an independent third-party inspector). For nuclear applications, Type 3.2 is frequently specified because it adds an independent verification layer.
Chemical analysis report per heat, showing the full composition against the grade limits, including the trace elements that matter for nuclear service such as cobalt and boron.
Mechanical test report covering tensile strength, yield strength, and elongation, taken from the same heat and condition as the supplied tube.
Heat treatment records confirming the annealing temperature, time, and atmosphere used, since the final microstructure depends on it.
Non-destructive examination reports, including hydrostatic testing, ultrasonic testing (UT), eddy current testing (ET), and, where specified, liquid penetrant testing (PT), each with the acceptance criteria applied.
Positive material identification (PMI) report confirming that the finished tube matches the declared grade.
Dimensional inspection report recording outside diameter, wall thickness, and length against the tolerances of the standard.
Traceability and marking records, linking the heat number, lot number, and the marking stamped on each tube so that every piece can be traced back to its melt.
Certificate of conformance signed by the supplier, confirming that the material was manufactured, inspected, and tested in accordance with the specified code edition.

A practical checklist for buyers

Before accepting a B167 Ni-Cr-Fe alloy tube for nuclear use, walk through this checklist with your supplier:

Confirm the exact code edition (ASTM B167 or ASME SB-167) and year stated on the certificate matches your project specification.
Check the EN 10204 certificate type. If Type 3.2 is required, verify the third-party inspector is approved for nuclear work.
Verify that every document carries the same heat number and that the physical marking on the tube matches.
Confirm the NDE coverage matches the code requirement, not just the minimum in the base standard.
Ask for the heat treatment records and, for steam generator service, the surface finish and cleanliness records.
Confirm the supplier operates under a recognised quality system, such as ISO 9001, and can show how records are retained and retrieved.

How EZ Steel Industrial supports nuclear documentation

EZ Steel Industrial Co., Ltd. supplies B167 Ni-Cr-Fe alloy tube with mill test certificates and full ASTM B167 compliance, covering grades such as UNS N06600 and N06690 for high-temperature and corrosion service. The same grades are also widely specified as heat exchanger tube for steam generators and condensers. The company also supplies RCC-M Section II nuclear tube for safety-critical applications, and its manufacturing network applies more than twelve quality checkpoints, including hydrostatic testing, ultrasonic testing, positive material identification, and mill test certificates, under an ISO 9001 quality management system. Whether your project is built to ASME Section III or RCC-M, the documentation package can be prepared to match the code edition and certificate type your specification requires.

Documentation is not a formality in nuclear procurement; it is the evidence that a component is fit for service. By understanding which standards apply, which documents are required, and how to verify them, engineers and procurement teams can avoid the delays and safety questions that arise when a certificate package is incomplete.