Alloy 926 Fastener Specifications and Certifications: ASTM A479, EN 10204 3.2, NACE & More

When procuring Alloy 926 fasteners for critical service in seawater, chemical processing, or FGD systems, specifying the correct standard and obtaining the proper certification is just as vital as the material itself. RAYCHIN LIMITED, a specialist global manufacturer and supplier of high‑performance alloy fasteners, routinely supplies Alloy 926 bolts and studs certified to ASTM A479 UNS N08926, accompanied by the full suite of supporting documentation. This guide clarifies how Alloy 926 maps to key industry standards—including why the common search for "Alloy 926 fasteners ASTM A193" requires a particular explanation—and how RAYCHIN ensures total compliance with every shipment.

1. Why There Is No Formal ASTM A193 Grade for Alloy 926 — and What We Do Instead

One of the most frequent questions we receive is whether Alloy 926 fasteners ASTM A193 can be supplied. The straightforward answer is that ASTM A193 does not currently contain a specific grade designation for UNS N08926 (Alloy 926). The standard lists grades for materials like B8 (304), B8M (316), B8T (321), and B8R (AL6XN / UNS N08367), but not for Alloy 926. However, this does not mean your Alloy 926 fasteners cannot be properly certified for high‑temperature/high‑pressure service. RAYCHIN bridges this gap by certifying the material to ASTM A479, which covers the bar stock chemistry and mechanical properties, and by testing the finished fasteners to the same stringent requirements specified in ASTM A962—the general standard for high‑temperature bolting. This dual‑certification approach provides the same level of assurance as an ASTM A193 grade, with full traceability to UNS N08926.

2. ASTM A479 UNS N08926 Bolts: The Primary Specification

ASTM A479 is the specification for stainless steel bars and shapes for use in boilers and other pressure vessels. Alloy 926 ASTM A479 UNS N08926 bolts are machined from bar stock that meets the chemical and mechanical requirements of this standard. Key requirements include solution annealing, tensile testing (minimum 94 ksi ultimate, 43 ksi yield), elongation (minimum 35%), and hardness control (≤ 100 HRB). RAYCHIN's Alloy 926 fasteners are manufactured exclusively from A479‑compliant bar, and we verify the properties on the finished fastener through lot‑specific tensile and hardness testing.

3. ASTM B649: The Underlying Bar Standard

For projects that prefer to certify the raw material rather than the finished fastener, Alloy 926 ASTM B649 is the standard that covers nickel‑iron‑chromium‑molybdenum‑copper alloy (UNS N08926) bar and wire. RAYCHIN can supply Alloy 926 fasteners with certification to ASTM B649 for the raw material, combined with EN 10204 3.1 or 3.2 for the finished product. This provides a complete, auditable trail from the mill to the installed fastener.

4. EN 10204 3.1 and 3.2 Certificates, PMI, and Mill Test Reports

For the demanding environments where Alloy 926 is specified, a robust documentation package is non‑negotiable. RAYCHIN provides the complete suite:

• EN 10204 Type 3.1 certificate: Issued by our quality department based on in‑house testing—chemical analysis, tensile, hardness. This is standard with every Alloy 926 EN 10204 3.1 certificate shipment.
• EN 10204 Type 3.2 certificate: Adds an independent third‑party witness (Lloyds, DNV, Bureau Veritas) who validates the test results. RAYCHIN provides Alloy 926 3.2 certificate fasteners for critical pressure‑boundary, subsea, and offshore applications.
• Alloy 926 PMI test report: Positive Material Identification using optical emission spectroscopy is performed on finished fasteners to confirm UNS N08926 chemistry. A hard copy report is included with every shipment.
• Alloy 926 mill test certificate: The original raw material certification from the steel mill, linked to our internal processing records for full heat‑lot traceability.
• 1.4529 fasteners certification: For European projects, we provide certification referencing EN 10088‑3 (1.4529) as the equivalent designation to UNS N08926.

5. NACE MR0175 and NORSOK M‑650: Suitability for Sour and Offshore Service

Alloy 926 fasteners NACE MR0175 is a common inquiry. While Alloy 926 is not explicitly listed in NACE MR0175 / ISO 15156 for all sour service conditions, its high PREN (43–47) and excellent chloride SCC resistance make it a candidate for mildly sour environments. In the solution‑annealed condition, its hardness is well below the NACE threshold for most susceptible materials. RAYCHIN can supply Alloy 926 fasteners with a NACE conformance statement and supporting hardness data for your project's technical review.

Alloy 926 NORSOK M‑650 qualification is available through our documented manufacturing process and third‑party witness testing. We can provide the necessary manufacturer qualification records, process control documentation, and witness testing to satisfy NORSOK requirements for Norwegian continental shelf projects.

6. Alloy 926 Fasteners Specification Sheet — The RAYCHIN Documentation Package

A complete Alloy 926 fasteners specification sheet from RAYCHIN includes the following as standard:

7. Why RAYCHIN is Your Trusted Source for Certified Alloy 926 Fasteners

RAYCHIN LIMITED's expertise in 6Mo super austenitic stainless steels means we understand the documentation rigor that critical projects demand. We control every step—from certified ASTM A479 bar through in‑house CNC machining, solution annealing, thread rolling, and final inspection. This integrated approach guarantees that the paperwork perfectly matches the product. Whether you need a custom‑length Alloy 926 stud with a 3.2 certificate or a bulk order of hex bolts with PMI reports, we deliver on time, every time.