Inconel X750 Plate

An Inconel X750 plate is a flat-rolled,high-performance nickel-chromium superalloy flat stock engineered to withstand extreme mechanical stress,intense heat,and highly corrosive environments. Unlike standard stainless steel,it is a precipitation-hardenable meterial.It gains its exceptional tensile strength and creep-rupture properties through targeted additions of aluminum and titanium.

Key Properties & Specifications

Thermal Endurance:
It retains excellent mechanical strength from cryogenic temperatures up to 1300°F (700°C).With specialized heat treatment,it provides usable structural strength up to 1800°F (982°C).

Relaxation Resistance:
An Inconel X750 plate features high resistance to stress relaxation.This makes it perfect for heavy-duty components that must hold their tension or shape under extreme temperatures.

Corrosion & Oxidation Resistance:
It offers exceptional resistance to chloride-ion stress-corrosion cracking.It also withstands a wide variety of industrial corrosives under both reducing and oxidizing environments.

Applications of Inconel X750 Plate

We offer Inconel X750 plates and sheets in thicknesses of 0.5, 1.2, 1.5, 2.0 and 3.0.We offer not only stainless steel plates and sheets but also plates made of Hastelloy,Incoloy,Inconel,Monel,and other alloys.Our products comply with ASTM A240,EN 10204,ISO 9001,PED 2014/68/EU ,CE,and other standards.With over a decade of experience in manufacturing and import/export,we are your best wholesaler in China.

Chemical Composition of Inconel X750 Plate

The chemical composition of Inconel X750 plate is strictly standardized to ensure its exceptional high-temperature strength,oxidation resistance,and spring-like properties.

Ni (+ Co)	Cr	Fe	Ti	Nb (+ Ta)	Al	Co	Mn	Si	Cu	C	S
≥ 70.0	14.0 – 17.0	5.0 – 9.0	2.25 – 2.75	0.70 – 1.20	0.40 – 1.0	≤ 1.0	≤ 1.0	≤ 0.50	≤ 0.50	≤ 0.08	≤ 0.01

Metallurgical Microstructure & Heat Treatment Impact

The chemical composition alone is not enough;its properties must be “unlocked” via heat treatment.For plate products,two primary heat treatment routes are utilized based on the application:

Solution Annealed + Aged

Heated to around 1900°F (1038°C) to dissolve phases into a uniform blend,followed by rapid cooling.
Aged at 1300°F (704°C) to precipitate fine Gamma Prime.This optimizes tensile strength up to 1200°F (649°C).

Triple Heat Treated

Solution annealed at 2100°F (1149°C) for grain growth.
Intermediate aged at 1550°F (843°C) to precipitate carbides at grain boundaries.
Final aged at 1300°F (704°C) for maximum Gamma Prime formation. This unlocks performance up to 1500°F–1800°F (815°C–982°C).

Inconel X750 Standards & Equivalent Designations

Inconel X750 Alloy
Standard / System	Equivalent Designation	Product Form	ASTM	ASME	SAE AMS
UNS Number	UNS N07750	Plates, Sheets & Strips	–	–	AMS 5542 / 5598
DIN / German Werkstoff	W.Nr. 2.4669	Bars, Rods, Wires & Shapes	ASTM B637	ASME SB637	AMS 5667 / 5698 / 5699
EN Chemical Name	NiCr15Fe7TiAl	Seamless Pipes & Tubes	ASTM B163	ASME SB163	–
JIS	NCF 750	Welded Pipes & Tubes	ASTM B705	ASME SB705	–
BS	HR 505	Forgings & Flanges / Fittings	ASTM B637	ASME SB637	AMS 5668 / 5670
AFNOR	NC15FeT
Generic Trade Name	Alloy X750, Inconel X-750

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Mechanical Properties of Inconel X750 Plate

The mechanical properties of Inconel X750 Plate are highly versatile because they depend heavily on the specific heat treatment condition. Inconel X750 is specifically engineered to maintain high yield strength,tensile strength,and excellent creep-rupture properties at temperatures where standard stainless steels would instantly deform or soften.

Room-Temperature Mechanical Properties

For flat-rolled plate products conforming to AMS 5542 or ASTM B637, the material is typically tested in its fully age-hardened condition to unlock its maximum strength.

Property	Typical Value (Metric)	Typical Value (Imperial)
Ultimate Tensile Strength	1100 – 1250 MPa	160,000 – 180,000 psi
Yield Strength	750 – 850 MPa	110,000 – 123,000 psi
Elongation	20% – 30%
Hardness	30 – 38 HRC

Mechanical Design Parameters

Modulus of Elasticity (Young’s Modulus):
30.0 – 31.0 × 10⁶ psi
210 – 214 GPa
Poisson’s Ratio:
11.7 – 12.0 × 10⁶ psi
81 – 85.2 GPa
Shear Modulus:
0.29 – 0.31

High-Temperature Mechanical Performance

Up to 1200°F (649°C):
The tensile and yield strengths remain nearly flat compared to room temperature values. This stability is driven by the Gamma Prime (γ^‘) precipitates which pin the crystalline matrix.
1200°F to 1500°F (649°C to 815°C):
The tensile strength gradually begins to decline,but the plate still provides exceptional creep-rupture resistance.It resists stretching or breaking over thousands of hours under steady stress.
Cryogenic Strength:
X750 does not become brittle at freezing temperatures.It retains excellent impact strength and ductility all the way down to -423°F (-253°C),making it valuable for liquid rocket propellant systems.

Crucial Technical Factors Influencing X750 Mechanicals

When working with or designing parts using X750 plates,engineers focus heavily on the following secondary properties and material behaviors:

Fatigue Strength & Endurance Limits

Inconel X750 plate features superb resistance to high-cycle thermal and mechanical fatigue.Because plate material is frequently fabricated into flat springs,diaphragms,or high-pressure bellows,its ability to cycle repeatedly between hot and cold cycles without crack propagation is one of its primary engineering advantages.

Stress Relaxation Resistance

Unlike typical steels that relax and lose their clamping force when held under high tension at elevated temperatures,X750 plate keeps its tension.This makes it the premier choice for cutting out high-temperature sealing rings,heavy structural washers,and spring-loaded joints used in gas turbines.

The Two Principal Heat Treatments

An engineer can manipulate the plate’s mechanical performance depending on how it is baked:

The Standard Cycle (AMS 5542 / Service below 1200°F)

Solution treated at 1950°F (1066°C) and aged at 1300°F (704°C).This process maximizes room-temperature tensile strength and fatigue life.

The High-Temperature Cycle (Service above 1200°F)

Solution treated at 2100°F (1149°C),intermediate aged at 1550°F (843°C),and final aged at 1300°F (704°C).This triple heat treatment slightly reduces room-temperature tensile strength but massively upgrades long-term creep-rupture life and ductility at high temperatures.

Fabricating and Machining Considerations

The same mechanical properties that make X750 tough in service also make it a challenge to process in a workshop:

Work Hardening:
Because the alloy is incredibly tough,it work-hardens very quickly during cutting operations. Machining or drilling should always be performed while the plate is in the solution annealed condition,utilizing heavy,rigid machinery,sharp carbide tools,and constant positive feeds to avoid glazing the surface.
Post-Weld Heat Treatment:
If you weld sections of X750 plate together,the localized intense heat disrupts the grain structures.To restore uniform mechanical properties across the weld joint,the entire fabricated assembly should be re-solution annealed and aged.

Our Advantages in Manufacturing Inconel X750 Plate

Advanced Heat Treatment

Complete mastery over complex,multi-stage precipitation-hardening heat treatments,such as AMS 5542 standard aging and high-temperature triple-aging protocols.
Ensures precise and uniform formation of gamma prime (γ’) precipitates across the entire plate.This eliminates localized brittleness and prevents material distortion under extreme thermal stress.

Precision Rolling Mills

High-performance rolling mills capable of processing high-strength nickel-base superalloys to strict dimensional tolerances with exceptional surface finishes.
Delivers plates with superior flatness and minimal gauge variance.This drastically reduces material waste and tool wear during your customers’ secondary machining or grinding operations.

Strict Melt Control

Utilization of premium melting techniques-such as vacuum induction melting (VIM) and vacuum arc remelting (VAR)-to ensure ultra-clean chemical homogeneity.
Strictly locks critical elements into tight target ranges while eliminating trace impurities.This guarantees consistent lot-to-lot weldability and long-term creep resistance.

Aerospace Quality Assurance

A multi-layered,fully traceable inspection framework certified to global standards including AS9100, ISO 9001, and NADCAP.
Backed by rigorous NDT-such as ultrasonic voids scanning and dye penetrant testing-ensuring 100% compliance for mission-critical nuclear and aerospace applications.

FAQs About Inconel X750 Plate

What is the difference between Inconel 718 and X750 plate?

Inconel 718 is stronger below 1200°F (649°C),but X750 provides superior relaxation and creep resistance at higher temperatures up to 1500°F (815°C).

Why is X750 plate difficult to machine, and how do you fix it?

It work-hardens instantly under cutting pressure,so you must machine it in the soft solution annealed condition using sharp carbide tools and a constant,positive feed rate.

Can Inconel X750 plate be welded?

Yes,weld it in the Solution Annealed condition using Inconel 718 or 625 filler wire,then perform a full Post-Weld Heat Treatment to prevent strain-age cracking.

What are the main procurement standards for X750 plate?

Aerospace applications require AMS 5542 or AMS 5598,industrial/pressure uses require ASTM B637 or ASME SB637,and the material system code is UNS N07750.

How does heat treatment change the plate's properties?

Standard aging optimizes tensile strength and fatigue life for service below 1200°F,while triple aging maximizes long-term creep-rupture performance and ductility for service above 1200°F.

Inconel X750 Plate