UNS N08367 Welded Tube

B676: Standard Specification for UNS N08367 Welded Tube

In demanding engineering applications where superior corrosion resistance and mechanical integrity are paramount, adherence to robust material standards is essential. ASTM B676 provides the authoritative framework for specifying UNS N08367 welded tube, ensuring reliability and performance in critical environments. This standard is an indispensable resource for professionals involved in the design, manufacturing, and procurement of high-performance alloy tubing.

What is B676?

ASTM B676 is a comprehensive standard specification that defines the requirements for welded tubes made from UNS N08367, a high-nickel, high-chromium alloy. Developed by ASTM International, this standard ensures that manufacturers produce tubes with consistent chemical composition, mechanical properties, and fabrication quality suitable for general corrosion applications. Its primary purpose is to provide a clear set of criteria for the procurement and acceptance of this specialized alloy tubing.

Scope & Purpose

This standard governs the manufacture and supply of UNS N08367 welded tubes, specifically those produced using an automatic welding process without filler metal. It covers tubes specified by outside diameter and nominal wall thickness, with defined ranges for tube diameter (1/8 to 5 inches) and wall thickness (0.015 to 0.320 inches). The specification details requirements for material composition, mechanical properties, and non-destructive testing to ensure suitability for environments where resistance to various forms of corrosion is critical. It does not, however, address specific application safety concerns, which remain the responsibility of the end-user.

Who Must Comply?

• • Primary audience: Materials Engineers, Design Engineers, Quality Control Inspectors, Procurement Specialists, and Project Managers.
• • Industries affected: Materials Manufacturing, Chemical Processing, Petrochemical, Oil & Gas, Power Generation, Aerospace, and Industrial Equipment Manufacturing.
• • Compliance nature: Voluntary, but often a mandatory contractual requirement for projects demanding high-performance materials.
• • Enforcement: Compliance is typically verified through manufacturer certifications, independent laboratory testing, and customer inspections during material procurement and project execution.

Key Requirements Overview

The standard requires that UNS N08367 welded tubes be manufactured using an automated welding process without filler metal, followed by cold working and solution treatment. Professionals must ensure that the chemical composition strictly adheres to the specified limits for elements like chromium, nickel, and molybdenum, which are crucial for its corrosion resistance. Key provisions include meeting defined minimum tensile and yield strengths, along with elongation requirements, as detailed in the standard's mechanical property tables. Furthermore, the specification mandates rigorous non-destructive testing, such as hydrostatic, pneumatic, eddy current, or ultrasonic tests, to verify the integrity of the welded seam and the overall tube structure.

Related Standards & References

ASTM B676 works in conjunction with other ASTM standards to provide a complete material specification. ASTM B751, Specification for General Requirements for Nickel and Nickel Alloy Welded Tube, provides overarching requirements for general fabrication, testing, and inspection applicable to this alloy. Additionally, ASTM A1016/A1016M, Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes, may be referenced for specific mechanical testing procedures like the reverse-bend test or reverse-flattening test, depending on the tube dimensions