Inconel X-750 Nickel-Chromium Alloy Steel

Table of Contents

Overview

Inconel X-750 is a high-strength, Inconel X-750 Nickel-Chromium Alloy Steel known for its excellent performance in extreme temperatures and corrosive environments. Originally developed for the aerospace industry, this alloy’s unique properties make it invaluable in various applications, from gas turbines to nuclear reactors. In this comprehensive guide, we’ll dive deep into the chemical composition, mechanical properties, heat treatments, applications, advantages, and disadvantages of Inconel X-750. We’ll also look at pricing, suppliers, and answer some frequently asked questions. So, buckle up as we explore this remarkable material in detail!

Inconel X-750 Nickel-Chromium Alloy Steel

Chemical Composition of Inconel X-750 Nickel-Chromium Alloy Steel

Understanding the chemical composition of Inconel X-750 is crucial to appreciate its unique properties. This alloy is primarily composed of nickel and chromium, with other elements adding to its strength and durability.

ElementPercentage Composition
Nickel (Ni)70.0 min
Chromium (Cr)14.0-17.0
Iron (Fe)5.0-9.0
Titanium (Ti)2.25-2.75
Aluminum (Al)0.40-1.0
Niobium (Nb)0.70-1.20
Manganese (Mn)1.0 max
Silicon (Si)0.50 max
Copper (Cu)0.50 max
Carbon (C)0.08 max
Sulfur (S)0.01 max
Phosphorus (P)0.01 max

The dominant presence of nickel and chromium provides the alloy with its outstanding resistance to oxidation and corrosion, while elements like titanium and aluminum contribute to its high-temperature strength.

The Mechanical Properties of Inconel X-750 Nickel-Chromium Alloy Steel

Inconel X-750 stands out due to its impressive mechanical properties, which make it suitable for demanding applications.

PropertyValue
Tensile Strength1,400 MPa (minimum)
Yield Strength1,000 MPa (minimum)
Elongation15-20%
Hardness (Brinell)370-420 HB
Impact ToughnessExcellent
Creep ResistanceHigh (up to 704°C or 1300°F)
Fatigue StrengthHigh (good for cyclic stress)
Thermal Conductivity11.0 W/m·K
Electrical Resistivity1.3 µΩ·m
Modulus of Elasticity214 GPa
Poisson’s Ratio0.31

These properties underscore why Inconel X-750 is the go-to material for parts that must withstand high stress and temperatures, offering excellent durability and reliability.

Heat Treatment of Inconel X-750 Nickel-Chromium Alloy Steel

Heat treatment processes are vital in enhancing the performance of Inconel X-750. Here’s a detailed look at the typical heat treatments applied to this alloy.

Heat TreatmentTemperature RangeDurationCooling MethodPurpose
Solution Annealing982-1066°C (1800-1950°F)1-2 hoursAir or Water QuenchingTo dissolve carbides and gamma prime
Precipitation Hardening704-871°C (1300-1600°F)10-20 hoursAir CoolingTo increase strength and hardness
Stress Relieving621-648°C (1150-1200°F)1-4 hoursAir CoolingTo reduce residual stresses

Each heat treatment method serves a specific purpose, whether it’s enhancing mechanical properties or relieving internal stresses to improve material performance under operational conditions.

Applications of Inconel X-750 Nickel-Chromium Alloy Steel

Inconel X-750’s versatility means it is used across a variety of industries. Here are some key applications.

IndustryApplication
AerospaceGas turbine engines, rocket engines, thrust reversers
NuclearReactor core components, control rods
Oil and GasDownhole tools, wellhead components
Chemical ProcessingHeat exchangers, valve components, springs
AutomotiveTurbocharger rotors, exhaust systems
Power GenerationSteam turbine blades, bolts, and fasteners

The alloy’s high resistance to oxidation and corrosion, along with its mechanical strength, makes it invaluable in high-stress, high-temperature environments.

Suppliers and Pricing of Inconel X-750 Nickel-Chromium Alloy Steel

Finding reliable suppliers and understanding the cost can significantly impact your project’s budget and timeline. Here’s a snapshot of some suppliers and their pricing.

SupplierRegionPricing (per kg)Additional Services
Rolled AlloysNorth America$50-$80Custom cutting, fast delivery
Special MetalsGlobal$45-$75Heat treatment, machining
VDM MetalsEurope€40-€70Technical support, material testing
Haynes InternationalGlobal$50-$85Quality certification, consultation
ATI MetalsNorth America$55-$90Custom fabrication, technical advice

Prices can vary based on the supplier, region, and any additional services required. Always compare and consider long-term partnerships for better deals.

Advantages and Disadvantages of Inconel X-750 Nickel-Chromium Alloy Steel

When choosing a material for your project, it’s essential to weigh the pros and cons. Here’s how Inconel X-750 stacks up.

AdvantagesDisadvantages
High-temperature strengthExpensive compared to other alloys
Excellent oxidation and corrosion resistanceDifficult to machine
Good creep and stress rupture propertiesRequires specialized welding techniques
Versatile applicationsLimited availability in some regions
Long-term durabilityHeavier than some alternative materials

While Inconel X-750 offers exceptional benefits, it’s not without its challenges, particularly in terms of cost and machinability.

Comparing Inconel X-750 with Other Alloys

How does Inconel X-750 fare when compared to other high-performance alloys? Let’s see.

PropertyInconel X-750Inconel 718Hastelloy XStainless Steel 316
Tensile Strength1,400 MPa1,240 MPa760 MPa580 MPa
Corrosion ResistanceExcellentExcellentVery GoodGood
High-Temperature PerformanceUp to 704°CUp to 700°CUp to 1200°CUp to 870°C
CostHighHighModerateLow
MachinabilityDifficultModerateModerateEasy
ApplicationsAerospace, NuclearAerospace, Oil & GasChemical ProcessingGeneral Manufacturing

Compared to other alloys, Inconel X-750 stands out for its high tensile strength and superior high-temperature performance, though it comes at a higher cost and with machining challenges.

Inconel X-750 Nickel-Chromium Alloy Steel

FAQs

QuestionAnswer
What is Inconel X-750 used for?It is used in aerospace, nuclear reactors, oil and gas industries, and chemical processing due to its high strength and resistance to extreme environments.
How does Inconel X-750 differ from Inconel 718?Inconel X-750 offers slightly higher tensile strength and better high-temperature performance, whereas Inconel 718 is easier to machine and more widely available.
Can Inconel X-750 be welded?Yes, but it requires specialized techniques and careful heat treatment to avoid cracking and maintain its properties.
Why is Inconel X-750 so expensive?The high cost is due to the premium raw materials, complex manufacturing processes, and the alloy’s exceptional properties.
Is Inconel X-750 magnetic?No, Inconel X-750 is non-magnetic due to its high nickel content.

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