Alloy 926 (N08926)

What is Alloy 926 and its applications?

Alloy 926 (UNS N08926) is a high-alloy austenitic stainless steel containing molybdenum and nitrogen. It is used in chloride-bearing process equipment, seawater-related systems and chemical plant.

Seawater-related systems: Components selected for the actual chloride exposure.
Chemical processing: Equipment handling compatible oxidizing and reducing media.
Environmental plant: Gas-cleaning and other corrosive process systems.

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Engineering Application & Selection Guide

Chromium, molybdenum and nitrogen support localized-corrosion resistance; nickel stabilizes the austenitic structure. Its resistance must be evaluated for the actual environment rather than converted into a guaranteed service life from PREN.

Alloy 926 stud bolts — For desalination connections, specify water temperature, chlorination, crevice geometry and the final condition.
Alloy 926 hex bolts — For chemical vessels, assess the full acid-chloride mixture and galvanic contact in the assembly.
Alloy 926 socket head cap screws — For marine instruments, define material traceability, mechanical acceptance and access for inspection of recessed heads.

Compare 926 and 254 SMO against process-specific data and the required product condition. Neither a 6Mo family label nor PREN alone establishes reliable long-term service in warm, stagnant or chlorinated seawater.

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Alloy 926 Composition

Selected composition limits · wt.%

ElementWeight %

Cr: 20–21%
Ni: 24–26%
Mo: 6–7%
N: 0.15–0.25%
Cu: 0.5–1.5%
C: ≤0.02%

ASTM / ASME specifications by product form

Finished-product requirements

Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.

Alloy 926 hex bolt requirements ↗

Fasteners · dimensional references

Product	Reference
Hex bolts	ISO 4014 / ISO 4017 · ASME B18.2.1
Threaded studs	DIN 976-1 · ASME B18.31.2
Hex nuts	ISO 4032 · ASME B18.2.2
Socket head screws	ISO 4762 · ASME B18.3
Flat washers	ISO 7089 / ISO 7090 · ASME B18.21.1
Custom fasteners	Customer drawing

Raw-material specifications

Product form / scope	Reference
Bar & wire · Specify grade, condition and order requirements.	ASTM B649
Plate, sheet & strip	ASTM B625 / ASME SB625
Flat products	EN 10028 / EN 10088-2

Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.

How to specify round bar, plate, wire and strip ↗

Alloy 926 Mechanical Properties

Reference sample and condition

Data basis: Published specified limits
Test sample form: Bar
Sample size: ≤300 mm
Condition: Solution annealed
Test temperature: Room temperature
Test direction: Longitudinal and transverse

Key properties	Value
Tensile strength	600–800 MPa
0.2% yield strength	≥300 MPa
Elongation	≥40%

VDM Metals · Alloy 926 · April 2024 · Tables 2 & 5 ↗

Procurement and application guide

Specify the material and final condition

Specify solution-annealed condition and the relevant product dimensions.

Material forms in the technical reference: Rod & bar · Wire · Sheet · Strip · Plate · Discs & rings · Pipe & tube · Forgings.

Define the finished-part acceptance

Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.

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Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.

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