Nimonic 80A Fasteners & Material Enquiries

What is Nimonic 80A and its applications?

Nimonic 80A (UNS N07080) is a wrought, age-hardenable nickel-chromium alloy. It is used for turbine components, bolts, engine exhaust valves and other hot-service parts.

Gas turbines: Blades, rings, discs and bolts.
Engine exhaust systems: Valve and related thermal components.
Industrial thermal equipment: Tube supports and tooling components.

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Engineering Application & Selection Guide

Titanium and aluminum enable precipitation strengthening during aging. The heat-treatment sequence depends on product requirements; a producer material-temperature description does not define a finished bolt allowable.

Nimonic 80A stud bolts — For turbine-casing joints, define final heat treatment and required mechanical acceptance.
Nimonic 80A hex bolts — For hot exhaust supports, evaluate thermal movement and long-term loss of clamp load.
Nimonic 80A socket head cap screws — For confined thermal joints, agree lubrication, head geometry and inspection requirements.

Compare 80A and 718 using condition-specific creep, relaxation and fatigue evidence. The melting route, processing condition and finished-part specification can be as important as nominal composition.

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Nimonic 80A Composition

Selected composition limits · wt.%

ElementWeight %

Ni: Balance
Cr: 18–21%
Ti: 1.8–2.7%
Al: 1.0–1.8%
C: ≤0.10%

ASTM / ASME specifications by product form

Finished-product requirements

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

Nimonic 80A 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
Rod, bar & forging stock	ASTM B637 · BS 3076 / HR 1
Plate, sheet & strip	BS HR 201 · AECMA PrEN 2191
Pipe & tube	BS HR 401

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 ↗

Nimonic 80A Mechanical Properties

Reference sample and condition

Data basis: Catalogue reference minimums
Gauge length: A5, as labelled in supplied table

Key properties	Value
Tensile strength	≥930 MPa
0.2% yield strength	≥620 MPa
Elongation	≥20%

Supplied technical reference · Scanned PDF page 5 · printed page 17

Procurement and application guide

Specify the material and final condition

Confirm the aging condition and required strength.

Material forms in the technical reference: Round bar · Flat bar · Wire · Sheet · Plate · Forging stock · Hexagon & sections · Pipe & tube.

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.

Start with the information you have

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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