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Nickel Alloy Grade Data Sheet

Inconel 690

Inconel 690 is a high-chromium nickel alloy developed for excellent resistance to oxidation, hot corrosive media and stress corrosion cracking. Its approximately 30% chromium content provides strong resistance to oxidizing acids, sulfur-containing atmospheres and high-temperature water, while the high nickel content improves metallurgical stability and resistance to chloride-ion stress corrosion cracking. Alloy 690 is widely specified for nuclear steam-generator tubing, reactor components, chemical processing equipment, heat exchangers, furnace hardware and high-temperature fabricated assemblies.

 

 

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Material Overview

Inconel 690 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

Inconel 690 is a high-chromium nickel alloy developed for excellent resistance to oxidation, hot corrosive media and stress corrosion cracking. Its approximately 30% chromium content provides strong resistance to oxidizing acids, sulfur-containing atmospheres and high-temperature water, while the high nickel content improves metallurgical stability and resistance to chloride-ion stress corrosion cracking. Alloy 690 is widely specified for nuclear steam-generator tubing, reactor components, chemical processing equipment, heat exchangers, furnace hardware and high-temperature fabricated assemblies.

 

 

Inconel 690

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

Inconel 690 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 690
Nickel Ni 58.0 min Forms the alloy base and provides metallurgical stability and stress corrosion cracking resistance.
Chromium Cr 27.0-31.0 Provides excellent resistance to oxidation, oxidizing acids and high-temperature corrosion.
Iron Fe 7.0-11.0 Balances the nickel-chromium matrix and contributes to mechanical strength.
Carbon C 0.05 max Controlled to support weldability and resistance to intergranular corrosion.
Manganese Mn 0.50 max Controlled minor alloying and deoxidizing element.
Silicon Si 0.50 max Controlled minor element and deoxidizer.
Copper Cu 0.50 max Controlled residual element.
Sulfur S 0.015 max Restricted impurity for improved hot workability and material 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 8.19 g/cm3 0.296 lb/in3 Room temperature
Melting Range 1343-1377 °C 2450-2510 °F Typical range
Specific Heat Approx. 450 J/kg·°C Approx. 0.108 Btu/lb·°F Approx. 20 °C
Thermal Conductivity Approx. 12.1 W/m·°C Approx. 84 Btu·in/ft2·h·°F Approx. 20 °C
Electrical Resistivity Approx. 114 µΩ·cm Approx. 686 ohm-cmil/ft Approx. 20 °C
Modulus of Elasticity Approx. 211 GPa Approx. 30.6 x 103 ksi Annealed, room temperature
Mean Thermal Expansion Approx. 14.0 µm/m·°C Approx. 7.8 µin/in·°F 20-100 °C
Magnetic Permeability Approx. 1.002 Essentially non-magnetic Room temperature, condition dependent

 

 

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 – annealed 586 MPa min 207 MPa min 30% min By specification
Rod and bar – annealed 586 MPa min 207 MPa min 30% min By specification
Rod and bar – cold worked 760-1050 MPa 450-800 MPa 15-30% Condition dependent
Seamless pipe and tube – annealed 586 MPa min 207 MPa min 30% min By specification
Steam-generator tube – thermally treated 586-760 MPa 207-415 MPa 30% min Project specification
Forgings and rings – annealed 586 MPa min 207 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 Inconel 690 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 B168 / ASME SB168 Hot rolled plate, cold rolled sheet, strip and cut blanks EN10204 3.1, chemical analysis and mechanical testing
Rod, Bar and Wire ASTM B166 / ASME SB166 Round bar, rod, wire and machined bar MTC, PMI, tensile testing and dimensional inspection
Heat Exchanger Tube ASTM B163 / ASME SB163 Seamless condenser tube, heat-exchanger tube and steam-generator tube Eddy-current test, hydrostatic test, grain-size inspection and MTC
Seamless Pipe & Tube ASTM B167 / ASME SB167 Seamless pipe, process tube and pressure-system tube Hydrostatic test, eddy-current test, dimensional inspection and MTC
Welded Pipe ASTM B725 / ASME SB725 Longitudinally welded pipe and fabricated process piping Radiographic or ultrasonic inspection, hydrotest and MTC
Forgings and Flanges ASTM B564 / ASME SB564 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 ERNiCrFe-7, AWS A5.11 ENiCrFe-7 Matching welding wire, bare electrodes and covered electrodes Chemical analysis, mill certificate and dimensional inspection

 

 

Available Product Forms

Inconel 690 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, thermally treated, pickled or bright annealed Nuclear steam generators, heat exchangers and chemical process piping View Pipe & Tube
Round Bar Diameter 3-500 mm, custom cut lengths available Hot rolled, forged, annealed, peeled or polished Reactor hardware, valve parts, fasteners and machined components View Round Bar
Sheet & Plate Thickness 0.5-150 mm, custom widths and lengths Hot rolled, cold rolled, solution annealed, pickled or polished Chemical vessels, furnace components, reactor parts and fabricated equipment View Sheet & Plate
Strip & Foil Thickness 0.02-5 mm, precision slit widths available Cold rolled, solution annealed, bright finished or coil supplied Seals, flexible components, shields and precision formed parts View Strip & Foil
Wire Diameter 0.1-20 mm, coil, spool or straight-length supply Cold drawn, solution annealed, bright or pickled Wire forms, mesh, reactor hardware and welding-product manufacture View Wire
Fasteners Standard and custom bolts, nuts, screws, studs and washers Solution annealed, machined, rolled thread or custom finished Nuclear systems, chemical plants, heat exchangers and furnace equipment View Fasteners
Fittings ASME, ANSI, EN and custom drawing dimensions Seamless, welded, formed or machined, solution annealed Nuclear piping, chemical processing lines and heat-exchanger systems View Fittings
Flanges ASME B16.5, ASME B16.47, EN and custom large-diameter designs Forged, solution annealed, machined and inspected Reactor systems, pressure vessels and corrosive process piping 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 Nuclear components, pressure parts, valve bodies and furnace hardware View Forgings
Welding Wire Diameter 0.8-4.0 mm, spool, coil or straight length Precision drawn, clean bright finish and controlled chemistry Joining Alloy 690, nuclear repair welding and corrosion-resistant overlay cladding View Welding Wire

 

 

Material Selection Guide

When to consider Inconel 690

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 690 Helps Common Product Form Buyer Note
Nuclear steam-generator service High chromium and nickel contents provide resistance to high-temperature water and stress corrosion cracking. Seamless tube, bar, plate and reactor components Specify the nuclear standard, thermal treatment, grain size and eddy-current requirements.
Oxidizing acid environments The high chromium content provides strong resistance to nitric acid and other oxidizing media. Pipe, tube, plate, fittings and fabricated vessels Confirm acid concentration, contaminants, temperature and aeration.
Chloride-ion stress corrosion cracking The high nickel content provides useful resistance to chloride-induced stress corrosion cracking. Pipe, tube, sheet, plate and fittings Review chloride concentration, temperature, residual stress and crevice conditions.
Caustic and alkaline media Alloy 690 performs well in selected hot caustic and alkaline environments. Pipe, tube, valve parts and heat-exchanger components Specify concentration, temperature, impurities and operating pressure.
High-temperature oxidation Approximately 30% chromium supports formation of a stable protective oxide layer. Sheet, plate, tube, bar and furnace hardware Confirm maximum temperature, atmosphere and thermal cycling.
Nuclear and chemical welding Compatible nickel-chromium filler metals provide corrosion-resistant joints and overlay deposits. Plate, pipe, tube, fittings and welding wire Use a qualified procedure with controlled heat input and required post-weld inspection.

 

 

Why Choose Us

Supply and quality support for Inconel 690

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

Inconel 690 questions from buyers

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

Inconel 690 is mainly used for nuclear steam-generator tubing, reactor components, heat exchangers, chemical processing equipment, furnace hardware and other parts exposed to oxidizing media or high-temperature water.

Yes. UNS N06690 is the standardized UNS designation for Inconel 690. The alloy may also be identified as Alloy 690, Nickel Alloy 690, W.Nr. 2.4642 or NiCr29Fe.

Its high nickel and chromium contents provide strong resistance to high-temperature water corrosion, intergranular attack and stress corrosion cracking. Tube performance also depends on the specified solution annealing or thermal treatment and nuclear-quality inspection.

YSN128 can quote plate, sheet, strip, round bar, rod, wire, seamless pipe, seamless tube, forgings, flanges, fittings, fasteners and welding wire. Thermal treatment, cutting, machining and drawing-based supply can also be discussed.

Common specifications include ASTM B168 for plate and sheet, ASTM B166 for rod and bar, ASTM B163 for heat-exchanger tube, ASTM B167 for seamless pipe and tube, ASTM B564 for forgings and ASTM B366 for fittings. Related ASME specifications are widely used for pressure and nuclear equipment.

Yes. Alloy 690 can be welded using suitable nickel-alloy processes and compatible filler metals such as ERNiCrFe-7. Joint cleanliness, heat input, filler-metal selection and inspection must follow the approved project procedure.

Yes. Seamless Alloy 690 tubing can be supplied solution annealed or thermally treated when required. The order should specify dimensions, heat treatment, grain-size requirements, eddy-current acceptance criteria, hydrostatic testing and certificate requirements.

Please send the product form, dimensions, quantity, applicable ASTM or ASME standard, delivery condition, thermal-treatment requirements, inspection requirements, destination and service medium. Nuclear tube enquiries should also include grain size and nondestructive-testing criteria.

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