Inconel X-750 (N07750)

What is Inconel X-750 and its applications?

Inconel X-750 (UNS N07750) is a precipitation-hardenable nickel-chromium alloy used in gas-turbine parts, springs, fasteners and heat-treatment tooling. Different heat treatments serve different mechanical requirements.

Gas turbines: Blades, wheels, bolts and structural members.
Springs and fasteners: Components requiring a specified age-hardened condition.
Heat-treatment tooling: Fixtures, forming tools and test-machine grips.

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Engineering Application & Selection Guide

Aging develops gamma-prime strengthening precipitates. Solution, stabilization and aging treatments can change tensile properties, creep behavior and notch ductility; treatment names must be tied to the relevant product specification.

Inconel X-750 stud bolts — For turbine joints, state the governing specification and complete heat-treatment condition.
Inconel X-750 socket head cap screws — For confined thermal tooling, define fatigue requirements and head and thread-root geometry.
Inconel X-750 hex bolts — For sustained hot loads, require the relevant creep or relaxation evidence rather than relying only on tensile strength.

Compare X-750 and 718 using the required condition and design duty. A room-temperature hardness check does not validate creep resistance, and producer alloy-temperature ranges are not universal fastener limits.

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Inconel X-750 Composition

Selected composition limits · wt.%

ElementWeight %

Ni + Co: ≥70%
Cr: 14–17%
Fe: 5–9%
Ti: 2.25–2.75%
Al: 0.40–1.00%
Nb + Ta: 0.70–1.20%

ASTM / ASME specifications by product form

Finished-product requirements

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

Inconel X-750 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 & forgings	ASTM B637 / ASME SB637 · AMS 5667–5671 / 5747 · EN 10269
Plate, sheet & strip	AMS 5542 / 5598 · ISO 6208
Wire	AMS 5698 / 5699 · BS HR 505

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 ↗

Inconel X-750 Mechanical Properties

Reference sample and condition

Data basis: Typical reference sample
Test sample form: Hot-finished bar
Sample size: Ø12.7 mm (1/2 in)
Condition: Solution treated + aged (treatment B)
Test temperature: Room temperature
Heat treatment: 1800°F / 1 h, air cool; 1350°F / 8 h, furnace cool to 1150°F; total aging 18 h.

Key properties	Value
Tensile strength	1351 MPa
0.2% yield strength	1027 MPa
Elongation	24%

Special Metals · X-750 · Table 9 · Ø1/2 in hot-finished bar, treatment B ↗

Procurement and application guide

Specify the material and final condition

Specify the heat treatment; X-750 has several distinct property conditions.

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

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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