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Nickel Alloy Grade Data Sheet

Hastelloy X

Hastelloy X is a solid-solution-strengthened nickel-chromium-iron-molybdenum alloy developed for high-temperature strength, oxidation resistance and fabrication stability. The alloy retains useful ductility after prolonged thermal exposure and provides good resistance to oxidizing, carburizing and neutral furnace atmospheres. Alloy X is widely specified for gas-turbine combustion chambers, transition ducts, afterburner components, industrial furnaces, petrochemical equipment and other high-temperature welded assemblies.

 

 

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Material Overview

Hastelloy X material profile

A concise grade introduction for buyers who need to confirm composition, properties, standards, available forms and suitable applications before sending an inquiry.

Engineering profile

Hastelloy X is a solid-solution-strengthened nickel-chromium-iron-molybdenum alloy developed for high-temperature strength, oxidation resistance and fabrication stability. The alloy retains useful ductility after prolonged thermal exposure and provides good resistance to oxidizing, carburizing and neutral furnace atmospheres. Alloy X is widely specified for gas-turbine combustion chambers, transition ducts, afterburner components, industrial furnaces, petrochemical equipment and other high-temperature welded assemblies.

 

 

Hastelloy X

Technical data on this page is for material selection reference. Final acceptance values should be confirmed by the purchase standard, heat treatment condition, product form, size and material test certificate.

Chemical Composition

Hastelloy X composition range

The following table shows common limiting composition values for Alloy 625 / UNS N06625. Actual product chemistry is reported by heat on the material test certificate.

Element Symbol Typical Requirement Role in Alloy X
Nickel Ni Balance Forms the alloy base and provides high-temperature stability and corrosion resistance.
Chromium Cr 20.5-23.0 Provides resistance to oxidation and hot-gas corrosion.
Iron Fe 17.0-20.0 Balances the nickel-chromium matrix and contributes to strength and fabrication characteristics.
Molybdenum Mo 8.0-10.0 Provides solid-solution strengthening and improves resistance to reducing environments.
Cobalt Co 0.50-2.50 Supports high-temperature strength and structural stability.
Tungsten W 0.20-1.00 Contributes to solid-solution strengthening and elevated-temperature performance.
Carbon C 0.05-0.15 Supports carbide strengthening and creep resistance at elevated temperatures.
Manganese Mn 1.00 max Controlled minor alloying and deoxidizing element.
Silicon Si 1.00 max Controlled minor element and deoxidizer.
Copper Cu 0.50 max Controlled residual element.
Boron B 0.008 max Controlled in small quantities to support grain-boundary strength.
Sulfur S 0.030 max Restricted impurity for improved hot workability and welding quality.

 

 

Physical Properties

Key physical and thermal data

These values help customers compare density, thermal behavior, magnetic response and conductivity during early material selection.

Property Metric Value Imperial / Notes Condition
Density 8.22 g/cm3 0.297 lb/in3 Room temperature
Melting Range 1260-1355 °C 2300-2470 °F Typical range
Specific Heat Approx. 486 J/kg·°C Approx. 0.116 Btu/lb·°F Approx. 20 °C
Thermal Conductivity Approx. 9.1 W/m·°C Approx. 63 Btu·in/ft2·h·°F Approx. 20 °C
Electrical Resistivity Approx. 118 µΩ·cm Approx. 710 ohm-cmil/ft Approx. 20 °C
Modulus of Elasticity Approx. 205 GPa Approx. 29.7 x 103 ksi Solution annealed, room temperature
Mean Thermal Expansion Approx. 13.7 µm/m·°C Approx. 7.6 µin/in·°F 20-100 °C
Magnetic Permeability Approx. 1.001 Essentially non-magnetic Solution annealed, room temperature

 

 

Mechanical Properties

Room-temperature mechanical properties

Mechanical properties vary with product form, size, processing route and heat treatment. The table below summarizes commonly referenced nominal values for material selection.

Product Form / Condition Tensile Strength Yield Strength, 0.2% Elongation Hardness
Plate, sheet and strip – solution annealed 690 MPa min 275 MPa min 30% min By specification
Rod and bar – solution annealed 690 MPa min 275 MPa min 30% min By specification
Rod and bar – cold worked 825-1100 MPa 550-900 MPa 12-25% Condition dependent
Seamless pipe and tube – solution annealed 690 MPa min 275 MPa min 30% min By specification
Wire – annealed 690-900 MPa 275-500 MPa 25-40% By size and condition
Forgings and rings – solution annealed 690 MPa min 275 MPa min 25% min By specification

 

 

For pressure equipment, aerospace parts or project-specific acceptance, use the minimum requirements in the specified ASTM, ASME, AMS, EN or customer drawing rather than nominal values.

Standards & Specifications

Common Hastelloy X standards by product form

YSN128 can quote Alloy 625 products according to ASTM, ASME, AMS, EN, DIN, ISO or customer drawing requirements. Certificate scope can be matched to the purchase order.

Product Form Common Standards Typical Supply Item Certificate / Inspection
Plate, Sheet, Strip ASTM B435 / ASME SB435, AMS 5536 Hot rolled plate, cold rolled sheet, strip and cut blanks EN10204 3.1, chemical analysis and mechanical testing
Rod and Bar ASTM B572 / ASME SB572, AMS 5754 Round bar, rod, machined bar and cut lengths MTC, PMI, tensile testing and dimensional inspection
Seamless Pipe & Tube ASTM B622 / ASME SB622, AMS 5587 Seamless pipe, process tube and high-temperature tubing Hydrostatic test, eddy-current test and MTC
Welded Pipe ASTM B619 / ASME SB619 Longitudinally welded pipe and fabricated process piping Radiographic or ultrasonic inspection, hydrotest and MTC
Welded Tube ASTM B626 / ASME SB626 Welded process tube and heat-exchanger tube Eddy-current test, hydrostatic or pneumatic test and MTC
Forgings and Flanges ASTM B564 / ASME SB564, AMS 5754 Rings, discs, blocks, flanges and custom forgings Heat-treatment record, ultrasonic testing, PMI and MTC
Fittings ASTM B366 / ASME SB366 Elbows, tees, reducers, caps and drawing-based fittings PMI, dimensional inspection, penetrant testing and MTC
Welding Products AWS A5.14 ERNiCrMo-2, AWS A5.11 ENiCrMo-2 Matching welding wire, bare electrodes and covered electrodes Chemical analysis, mill certificate and dimensional inspection

 

 

Available Product Forms

Hastelloy X supply range

Review available product forms, size ranges, standards and delivery options for this alloy.

Form Common Size Range Delivery Condition Typical Applications Page Link
Pipe & Tube OD 6-762 mm, wall thickness or schedule to specification Seamless or welded, solution annealed, pickled or bright annealed Furnace systems, combustion equipment, petrochemical piping and hot-gas ducts View Pipe & Tube
Round Bar Diameter 3-500 mm, custom cut lengths available Hot rolled, forged, solution annealed, peeled or polished Turbine parts, furnace hardware, shafts and machined high-temperature components View Round Bar
Sheet & Plate Thickness 0.5-150 mm, custom widths and lengths Hot rolled, cold rolled, solution annealed, pickled or polished Combustion chambers, furnace liners, heat shields and transition ducts View Sheet & Plate
Strip & Foil Thickness 0.02-5 mm, precision slit widths available Cold rolled, solution annealed, bright finished or coil supplied High-temperature seals, flexible shields, diaphragms and formed components View Strip & Foil
Wire Diameter 0.1-20 mm, coil, spool or straight-length supply Cold drawn, solution annealed, bright or pickled Furnace wire forms, mesh, retaining components and welding-product manufacture View Wire
Fasteners Standard and custom bolts, nuts, screws, studs and washers Solution annealed, machined, rolled thread or custom finished Industrial furnaces, gas turbines, combustion systems and petrochemical equipment View Fasteners
Fittings ASME, ANSI, EN and custom drawing dimensions Seamless, welded, formed or machined, solution annealed High-temperature piping, furnace systems and petrochemical process lines View Fittings
Flanges ASME B16.5, ASME B16.47, EN and custom large-diameter designs Forged, solution annealed, machined and inspected Hot process piping, furnace equipment and combustion-system connections View Flanges
Forgings Rings, discs, blocks and shafts up to 2000 mm or drawing requirements Open-die or closed-die forged, solution annealed and machined Gas-turbine components, furnace parts, shafts and pressure equipment View Forgings
Welding Wire Diameter 0.8-4.0 mm, spool, coil or straight length Precision drawn, clean bright finish and controlled chemistry Joining Hastelloy X, high-temperature fabrication and repair welding View Welding Wire

 

 

Material Selection Guide

When to consider Hastelloy X

This guide helps buyers connect service conditions with the typical advantage of Alloy 625. Final selection should consider medium concentration, temperature, pressure, fabrication, availability and budget.

Service Requirement Why Alloy X Helps Common Product Form Buyer Note
Gas-turbine combustion systems Alloy X combines oxidation resistance, thermal stability and useful strength at elevated temperatures. Sheet, plate, bar, tube and fabricated assemblies Specify operating temperature, fatigue cycles, pressure and inspection requirements.
Industrial furnace equipment Chromium provides oxidation resistance while nickel and molybdenum support strength and structural stability. Sheet, plate, tube, bar and furnace hardware Confirm atmosphere, temperature, load and expected thermal cycling.
Carburizing environments The nickel-chromium matrix provides useful resistance to carbon absorption and carburization. Furnace tubes, trays, baskets, fixtures and sheet Specify carbon activity, maximum temperature and exposure duration.
Aerospace hot-section components The alloy retains useful ductility and fabrication stability after extended thermal exposure. Sheet, plate, forgings, fasteners and welded components Provide the AMS standard, grain requirements and nondestructive-testing class.
Petrochemical high-temperature service Alloy X resists oxidation and selected process atmospheres while maintaining mechanical strength. Pipe, tube, fittings, plate and fabricated assemblies Review process chemistry, sulfur content, pressure and operating temperature.
Complex welded fabrication Good forming and welding characteristics support combustion chambers, ducts and other fabricated structures. Sheet, plate, pipe, tube and welding wire Control cleanliness, heat input, interpass temperature and final inspection.

 

 

Why Choose Us

Supply and quality support for Hastelloy X

For ranking traffic, buyers need more than a data sheet. This section gives clear trust signals for procurement, engineering and quality teams.

STASTM / ASME / AMS / EN

Quotation can be matched to project standards and product form specifications.

MTEN10204 3.1 MTC

Heat number, chemistry, mechanical properties and inspection records can be supplied.

QCPMI & Inspection

PMI, UT, dimensional inspection, visual inspection and packing check are available.

CSCustom Size

Cutting, machining allowance, rough machining and drawing-based supply can be arranged.

EPExport Packing

Wooden case, bundle, waterproof protection and international shipping documents.

RFFast Technical Reply

Send grade, size, standard, quantity and destination for a practical quotation route.

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Compare nearby grades and product forms

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FAQ

Hastelloy X questions from buyers

Find practical answers about procurement, standards, fabrication and industrial applications.

Hastelloy X is mainly used for gas-turbine combustion chambers, transition ducts, afterburners, industrial furnaces, heat-treatment equipment, petrochemical systems and other high-temperature fabricated components.

Yes. UNS N06002 is the standardized UNS designation for Hastelloy X. The alloy may also be identified as Alloy X, Nickel Alloy X, W.Nr. 2.4665 or NiCr22Fe18Mo.

No. Hastelloy X is primarily strengthened by solid-solution effects from molybdenum and other alloying elements. It is normally supplied in the solution-annealed condition rather than precipitation hardened.

YSN128 can quote plate, sheet, strip, round bar, rod, wire, seamless pipe, welded pipe, tube, forgings, flanges, fittings, fasteners and welding wire. Cutting, forming, machining and drawing-based production can also be discussed.

Common specifications include ASTM B435 for plate and sheet, ASTM B572 for rod and bar, ASTM B622 for seamless pipe and tube, ASTM B619 for welded pipe, ASTM B626 for welded tube, AMS 5536, AMS 5754 and AMS 5587.

Yes. Hastelloy X has good weldability using suitable gas-tungsten arc, gas-metal arc and other nickel-alloy welding processes. Matching filler metals such as ERNiCrMo-2 may be used according to the approved welding procedure.

Hastelloy X provides useful resistance to oxidation and carburization in many furnace environments. Selection should consider carbon activity, temperature, thermal cycling, mechanical load and the presence of sulfur or other contaminants.

Please send the product form, dimensions, quantity, applicable ASTM, ASME or AMS standard, solution-annealing requirements, inspection requirements, destination and service temperature. Drawings should be included for forgings and fabricated components.

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