Inconel & Incoloy Alloys
Nickel-chromium and nickel-iron-chromium alloys for heat resistance, oxidation resistance, creep strength and high-temperature corrosion service.
Quick Answer: J&A Alloy supplies nickel-base high-temperature alloys including Inconel, Incoloy, Nimonic, Udimet, Haynes and GH series alloys in bar, plate, sheet, pipe, tube, wire, forging and custom processed forms. These alloys are selected for high-temperature strength, oxidation resistance, creep resistance, thermal stability and hot corrosion service.
Use this page to compare high-temperature nickel alloy families, match common grades to working temperature and service conditions, and prepare RFQs with the right product form, standard, heat treatment condition and inspection requirements.
Main Nickel-Base High-Temp Alloy Families
Nimonic, Udimet & Haynes Alloys
Superalloys for turbine, spring, fastener, combustion, hot gas and furnace-related components where hot strength and oxidation resistance matter.
GH Series High-Temp Alloys
Chinese high-temperature alloy grades used for hot working, turbine, combustion chamber, aerospace and high-temperature industrial components.
Popular Nickel-Base High-Temp Alloy Products
| Alloy | UNS / Grade | Best For | Common Product Forms |
|---|---|---|---|
| Inconel 718 | UNS N07718 | High strength at elevated temperature, aerospace parts, fasteners and forgings | Bar, forging, sheet, wire |
| Inconel X-750 | UNS N07750 | Springs, hot fasteners, turbine-related components and heat-treated parts | Wire, bar, sheet |
| Incoloy A286 | UNS S66286 | Heat-resistant fasteners, turbine components and precipitation-hardened parts | Bar, wire, sheet, forging |
| Nimonic 80A | UNS N07080 | Valve, spring, bolt, turbine and hot mechanical components | Bar, wire, forging |
| Haynes 230 | UNS N06230 | Excellent high-temperature strength and oxidation resistance in furnace and combustion service | Plate, sheet, bar, welding wire |
| Hastelloy X | UNS N06002 | Combustion chambers, hot gas ducts, furnace parts and oxidation service | Plate, sheet, bar, pipe |
| Udimet 188 | UNS R30188 | High-temperature oxidation and sulfidation resistance, gas turbine and combustor parts | Sheet, plate, bar |
| Incoloy 925 | UNS N09925 | High-strength nickel alloy for sour service, oil and gas and elevated-temperature environments | Bar, tube, forging |
Choose by High-Temperature Application
| Application | Recommended Starting Grades | Selection Notes |
|---|---|---|
| Aerospace and gas turbine parts | Inconel 718, Inconel X-750, Nimonic 80A, GH4738 | Confirm strength, fatigue, creep, heat treatment condition and specification. |
| Hot fasteners and springs | Inconel X-750, Incoloy A286, Nimonic 80A, Nimonic 901 | Age-hardening condition, tensile strength and relaxation resistance are key. |
| Furnace and heat-treatment equipment | Haynes 230, Hastelloy X, GH3030, GH3128 | Review oxidation resistance, thermal cycling and working atmosphere. |
| Combustion chambers and hot gas ducts | Hastelloy X, Haynes 230, Udimet 188, GH3044 | Consider oxidation, hot corrosion, weldability and sheet/plate availability. |
| Oil, gas and sour high-strength service | Incoloy 925, Inconel 718 | Confirm sour service requirements, mechanical properties and applicable standards. |
| High-temperature chemical processing | Inconel 783, Hastelloy X, Haynes 230, GH series | Match alloy to temperature, gas chemistry, corrosion medium and fabrication method. |
Available Product Forms
| Product Form | Typical Alloys | RFQ Information to Confirm |
|---|---|---|
| Bar / Rod | Inconel 718, X-750, A286, Nimonic 80A, GH4738 | Diameter, length, heat treatment condition, tolerance and mechanical properties. |
| Plate / Sheet / Strip | Haynes 230, Hastelloy X, Udimet 188, GH3030, GH3128 | Thickness, width, length, surface, flatness, cutting and inspection requirements. |
| Wire | Inconel X-750, A286, Nimonic 80A, Inconel 718 | Diameter, coil/spool, temper, tensile strength and surface finish. |
| Pipe / Tube | Hastelloy X, Haynes 230, Inconel 718, GH alloys | Seamless/welded type, OD, wall thickness, length and standard. |
| Forging / Ring / Custom Parts | Inconel 718, Incoloy 925, A286, GH4698, GH4738 | Drawing, forging ratio, heat treatment, UT, hardness and final machining allowance. |
High-Temp Alloy Selection Guide
| If your project needs... | Start with... | Why |
|---|---|---|
| Very high strength after heat treatment | Inconel 718, A286, GH4738 | Precipitation-hardening alloys provide high tensile and yield strength after aging. |
| Spring performance at elevated temperature | Inconel X-750, Nimonic 80A | These grades are widely used where relaxation resistance and hot strength are required. |
| Oxidation resistance in furnace service | Haynes 230, Hastelloy X, GH3030 | Nickel-chromium chemistry supports oxidation resistance and thermal stability. |
| Combustion and hot gas corrosion resistance | Udimet 188, Haynes 230, Hastelloy X | These alloys are common starting points for hot gas, combustor and thermal cycling service. |
| Chinese equivalent or domestic high-temp alloy | GH3030, GH3128, GH3044, GH4698, GH4738, GH2696 | GH grades are often selected for China-standard high-temperature engineering requirements. |
Common Standards and Procurement Notes
| Requirement | What to Specify | Why It Matters |
|---|---|---|
| Standard / specification | ASTM, AMS, ASME, EN, GB or customer drawing | High-temperature alloys are often purchased to strict aerospace or pressure equipment requirements. |
| Heat treatment condition | Solution annealed, aged, precipitation hardened or as-forged | Mechanical properties depend heavily on condition and aging treatment. |
| Inspection | EN 10204 3.1 MTC, PMI, UT, hardness, tensile test, third-party inspection | Critical projects usually require traceability and verified mechanical properties. |
| Processing | Cutting, machining allowance, forging drawing, straightness, surface finish | Clear processing requirements reduce quotation ambiguity and delivery risk. |
Temperature Range Selection Guide
Working temperature is usually the first filter for nickel-base high-temperature alloy selection. The table below gives a practical starting point before final engineering review.
| Approximate Service Temperature | Recommended Starting Alloys | Typical Use Cases | Key Checks |
|---|---|---|---|
| Up to about 600°C | Incoloy A286, Inconel 718, Incoloy 925 | Fasteners, shafts, sour-service components, high-strength industrial parts | Strength, heat treatment condition, corrosion medium and specification |
| 600-700°C | Inconel 718, Inconel X-750, Nimonic 80A, Nimonic 901 | Aerospace fasteners, springs, bolts, turbine-adjacent hardware | Age-hardened condition, fatigue, relaxation resistance and creep strength |
| 700-850°C | Inconel X-750, Nimonic 80A, Hastelloy X, GH3044 | Hot springs, furnace supports, combustion hardware and heat-treatment fixtures | Oxidation resistance, thermal cycling, weldability and load level |
| 850-1000°C | Haynes 230, Hastelloy X, Udimet 188, GH3128 | Furnace parts, combustor liners, hot gas ducts and radiant tubes | Oxidation, carburization, sulfidation, creep and fabrication route |
| Above 1000°C or severe thermal cycling | Haynes 230, Udimet 188, selected GH series alloys | Critical hot-zone and combustion-related parts | Atmosphere chemistry, design stress, expected life and inspection requirements |
Inconel 718 vs Inconel X-750 vs Incoloy A286
These three precipitation-strengthened alloys are common choices when buyers need high-temperature strength, fastener performance or spring performance. The best choice depends on temperature, load, heat treatment condition and applicable specification.
| Grade | Strengthening Type | Best Starting Use | Typical Forms | Procurement Notes |
|---|---|---|---|---|
| Inconel 718 | Niobium-strengthened precipitation hardening | High-strength aerospace parts, forgings, fasteners and structural components | Bar, forging, sheet, wire, ring | Confirm AMS/ASTM standard, solution and age condition, tensile properties and UT if forging is required. |
| Inconel X-750 | Aluminum/titanium precipitation hardening | High-temperature springs, bolts, clips, turbine and hot mechanical parts | Wire, bar, sheet, strip | Confirm spring temper or age-hardened condition, diameter, coil/spool, relaxation requirement and surface finish. |
| Incoloy A286 | Iron-nickel-chromium precipitation hardening | Heat-resistant fasteners, bolts, turbine hardware and lower-cost high-strength parts | Bar, wire, sheet, forging | Confirm AMS/ASTM standard, aged condition, mechanical properties and whether stainless-equivalent corrosion resistance is sufficient. |
Choose by Industry and Component Type
| Industry / Component | Common Starting Alloys | Why These Grades Are Considered |
|---|---|---|
| Aerospace fasteners and structural hardware | Inconel 718, A286, Nimonic 80A | High strength after aging, fatigue resistance and specification-controlled supply. |
| Gas turbine and combustion parts | Hastelloy X, Haynes 230, Udimet 188, GH3044 | Oxidation resistance, hot gas stability and good performance under thermal cycling. |
| Furnace fixtures and heat-treatment baskets | Haynes 230, GH3030, GH3128, Hastelloy X | Resistance to oxidation, creep deformation and repeated heating/cooling cycles. |
| High-temperature springs and clips | Inconel X-750, Nimonic 80A, A286 | Spring relaxation resistance and strength retention at elevated temperature. |
| Oil and gas high-strength service | Inconel 718, Incoloy 925 | High strength combined with nickel alloy corrosion resistance in demanding service. |
| Hot chemical processing equipment | Hastelloy X, Haynes 230, Inconel 783, GH series | Selection depends on gas chemistry, oxidation, hot corrosion and fabrication method. |
High-Temperature Alloy Procurement Checklist
For faster quotation and fewer engineering revisions, include the following details when sending a nickel-base high-temperature alloy RFQ.
Material and Standard
- Alloy grade, UNS number or equivalent grade
- ASTM, AMS, ASME, EN, GB or customer specification
- Required material condition and heat treatment
Size and Product Form
- Bar, plate, sheet, pipe, tube, wire, forging or ring
- Diameter, thickness, width, length or drawing
- Tolerance, surface finish and machining allowance
Inspection and Service
- MTC, PMI, UT, tensile, hardness or third-party inspection
- Working temperature, load and service atmosphere
- Destination country, quantity and required lead time
Related Material Selection Links
Use these links to compare alloy families and individual grades before sending a high-temperature alloy RFQ.
Nickel-Base High-Temp Alloy FAQ
What is a nickel-base high-temperature alloy?
It is a nickel-rich alloy designed to retain strength, oxidation resistance and structural stability at elevated temperatures where ordinary stainless steels may lose strength or oxidize quickly.
Which alloy is best for high-temperature strength?
Inconel 718, Inconel X-750, Incoloy A286 and Nimonic 80A are common starting points, depending on temperature, load, heat treatment condition and specification.
Which alloys are used for furnace parts?
Haynes 230, Hastelloy X, GH3030, GH3128 and GH3044 are often considered for furnace, heat-treatment and hot gas service because of oxidation resistance and thermal stability.
What information is needed for a quote?
Please send alloy grade, standard, product form, size, quantity, heat treatment condition, inspection requirement, working temperature and destination country.
Can J&A Alloy supply custom high-temp alloy parts?
Yes. J&A Alloy can quote custom cut plate, bar, wire, tube, forging, ring and machined blank requirements depending on alloy, size and quantity.
How should I choose between Inconel 718 and X-750?
Inconel 718 is often selected for high-strength aerospace and forged components, while X-750 is widely used for springs, fasteners and hot mechanical parts. Final selection depends on design requirements.
Request a Nickel-Base High-Temp Alloy Quote
Send us the alloy grade, UNS or equivalent grade, product form, size, quantity, standard, heat treatment condition, inspection requirement, working temperature and destination country. If you are comparing grades, include service temperature, load, medium and fabrication requirements.
- Material: alloy grade, UNS number, AMS/ASTM/GB/EN standard or equivalent specification
- Form and size: bar, plate, sheet, pipe, tube, wire, forging, ring or custom part
- Condition: solution annealed, aged, precipitation hardened, as-forged or machined blank
- Inspection: EN 10204 3.1 MTC, PMI, UT, tensile, hardness, third-party inspection