01
ASTM B637 / B637M
Nickel-chromium-molybdenum-columbium alloy rod and bar
Standard specification for precipitation-hardening nickel alloy rod and bar for high-temperature service.
Nickel Alloy — Industrial Product
Inconel 718 Bars & Rods
Inconel 718 nickel alloy bars and rods supplied to ASTM B637 / AMS 5662 / AMS 5663 for high-temperature fasteners, aerospace and gas turbine components.
Indicative priceUSD 40,000 - 65,000 / MT (volume, condition, AMS spec and size dependent)
Lead time30 - 60 working days
01
Overview
Inconel 718 Bars & Rods combine a nickel-chromium matrix with substantial niobium, molybdenum and titanium additions to deliver high strength through precipitation (age) hardening. In the solution-annealed-plus-aged condition, the alloy achieves tensile strength above 1275 MPa while retaining useful creep resistance up to approximately 700 °C. It is supplied in round, square and hex bar form per ASTM B637 / ASME SB637 and the corresponding aerospace specifications AMS 5662, AMS 5663 and AMS 5664. The combination of high strength, fatigue resistance and thermal stability makes the bar suited to high-temperature fasteners, gas turbine and aerospace components, rocket and missile parts, high-strength shafts, valve and wellhead components for oil & gas, and tooling where sustained mechanical loading at elevated temperature is required. Each delivery is supported by mill test certification per EN 10204 3.1 and full traceability of heat number, chemical analysis and heat-treatment lot.
Key Characteristics
- 01 High Strength Provides high mechanical strength for demanding structural and industrial applications.
- 02 High Temperature Capability Suitable for elevated-temperature service within the applicable material limits.
- 03 Creep Resistance Provides resistance to time-dependent deformation during prolonged high-temperature service.
- 04 Fatigue Resistance Provides good resistance to repeated cyclic loading.
- 05 Age-Hardenable Achieves high strength through precipitation-hardening heat treatment (solution anneal + aging).
- 06 Corrosion Resistance Provides improved resistance to corrosive industrial environments.
- 07 Good Machinability Supports efficient machining with appropriate tooling and cutting conditions.
- 08 Good Weldability Supports welding using suitable procedures and compatible filler materials.
- 09 Dimensional Stability Provides stable dimensions during processing and service under suitable conditions.
- 10 Standard Compliance Manufactured and supplied in accordance with the specified material and product standards.
- 11 Third-Party Inspection Third-party inspection can be arranged according to project and procurement requirements.
- 12 Traceable Documentation Supplied with documentation supporting material identification, chemical and mechanical traceability.
Typical Applications
- Aerospace Components Aircraft structural and non-structural components where strength-to-weight ratio and material traceability are important.
- Power Generation Piping, tubing and structural components for conventional and combined-cycle power stations.
- Machinery & Equipment Shafts, gears, housings, frames and other components for industrial machinery and OEM equipment.
- Oil & Gas Service Process piping, flow lines and utility systems across onshore and offshore upstream, midstream and downstream operations.
- Pressure Vessels Shell, head and nozzle components for pressure vessels designed to ASME, EN or equivalent codes.
- Stamping & Machining Metal forming and machining for stamping, deep drawing, CNC machining and forging operations.
- Welding & Fabrication Metal structures, assemblies and fabricated components for welded construction.
02
Specifications
Numbers in this section correspond to the applicable product standard, formatted for direct use in enquiry and approval documents.
Product specification
- Material
- Nickel-chromium-iron-niobium-molybdenum alloy (precipitation hardenable)
- Grade
- Inconel 718 / NiCr19Fe19Nb5Mo3 / 2.4668
- UNS_designation
- N07718
- Product_form
- Bar / rod
- Manufacturing_method
- Hot rolled, hot forged, cold drawn or centerless ground
- Condition
- Solution annealed; solution annealed + precipitation (age) hardened
- Surface
- Mill finish; turned, peeled, ground or polished on request
- Cross_section
- Solid round (standard); square, hex and flat on request
- End_condition
- Mill cut; chamfered or machined ends on request
Supply specifications
- Diameter
- 6 - 350 mm (round); custom sections on request
- Length
- 3 - 12 m; cut-to-length on request
- Tolerance
- Per ASTM B637 / AMS 5662 / AMS 5663 as applicable
- Surface_finish
- Mill finish; turned, peeled, ground or polished on request
- Straightness
- <= 1.5 mm/m (turned or ground)
- Ultrasonic_test
- Per ASTM A388 / AMS 5662 as applicable
- Marking
- Standard mill marking including grade, size, heat number and standard; customer marking on request
- Heat_treatment
- AMS 5662 (annealed) / AMS 5663 (annealed + aged, ~1275 MPa Rm)
Final supply is confirmed against the project drawing, purchase agreement and the mill test certificate.
Chemical composition
ElementRequirement
Ni 50.0 - 55.0 %
Cr 17.0 - 21.0 %
Nb + Ta 4.75 - 5.50 %
Mo 2.80 - 3.30 %
Ti 0.65 - 1.15 %
Al 0.20 - 0.80 %
Co <= 1.0 %
C <= 0.08 %
Mn <= 0.35 %
Si <= 0.35 %
P <= 0.015 %
S <= 0.015 %
B <= 0.006 %
Cu <= 0.30 %
Fe Balance
Reference: Per ASTM B637 / AMS 5662 / AMS 5663 for Inconel 718 (UNS N07718).
Mechanical properties
PropertyRequirement
Tensile strength (Rm, AMS 5662 annealed) >= 827 MPa
Yield strength (Rp0.2, AMS 5662 annealed) >= 414 MPa
Tensile strength (Rm, AMS 5663 aged) >= 1276 MPa
Yield strength (Rp0.2, AMS 5663 aged) >= 1054 MPa
Elongation (AMS 5663 aged) >= 12 %
Hardness_aged ~331 - 401 HB
Tensile strength (Rm, aged) at 650 °C ~1100 MPa (typical)
Yield strength (Rp0.2, aged) at 650 °C ~950 MPa (typical)
Stress rupture (aged, 650 °C / 690 MPa) >= 23 h (typical)
Reference: Room-temperature values per AMS 5662 (annealed) and AMS 5663 (annealed + aged). Elevated-temperature and stress-rupture values are typical and provided for design reference only.
Physical properties
PropertyTypical Value
Density 8.19 g/cm³
Melting range 1260 - 1336 °C
Elastic modulus 200 GPa at 20 °C
Shear modulus 77 GPa at 20 °C
Poisson's ratio 0.284
Thermal conductivity 11.4 W/m·K at 20 °C
Specific heat 435 J/kg·K at 20 °C
Electrical resistivity 1.25 µΩ·m at 20 °C
Thermal expansion (20 - 100 °C) 13.0 x 10⁻⁶ /°C
Curie temperature Non-magnetic (essentially)
Reference: Typical material values for Inconel 718 nickel alloy.
Reference framework
Standards & documentation
The applicable product, dimensional and inspection standards should be confirmed together in the purchase specification.
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ASME SB637 / SB637M
ASME pressure vessel equivalent
ASME counterpart of ASTM B637 for pressure vessel and high-temperature applications.
03
AMS 5662
Aerospace Material Specification - Inconel 718 bar (annealed)
Aerospace Material Specification for Inconel 718 corrosion and heat-resistant steel bar and forging stock in the annealed condition.
04
AMS 5663
Aerospace Material Specification - Inconel 718 bar (annealed + aged)
Aerospace Material Specification for Inconel 718 precipitation-hardened bar in the annealed + aged condition (Rm >= 1275 MPa).
05
AMS 5664
Aerospace Material Specification - Inconel 718 bar / forging (vacuum induction + consumable remelt)
Aerospace Material Specification for Inconel 718 bar and forging stock produced by vacuum induction melting plus consumable electrode remelting for premium-grade applications.
06
EN 10269
Steels and nickel alloys for fasteners for high and low temperature service
European reference for high-temperature steel and nickel alloy bar stock used for bolting and fastener manufacture.
07
API 6A 718 / NACE MR0175
Oil & gas reference - Inconel 718 for sour service
Industry reference for Inconel 718 bar used in wellhead and Christmas tree equipment, including sour-service environments per NACE MR0175.
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EN 10204
Inspection documents
Defines inspection document types such as 3.1 and 3.2 for metallic product delivery.
03
Capability
From custom dimensions and precision sizing to heat treatment, surface finishing and product-specific processing, Wayland coordinates supply solutions tailored to your requirements.
Cutting
Cut-to-length and custom cutting according to order requirements.
Custom Dimensions
Non-standard dimensions, tolerances and dimensional combinations subject to product and mill capability.
Precision Sizing
Precision sizing and dimensional control for tighter tolerance requirements.
Cold Working
Cold drawing, cold sizing and other cold-working processes where required.
Heat Treatment
Heat treatment according to material, specification and applicable standard.
Surface Finishing
Surface treatment and finishing according to product, specification and application requirements.
Surface Coating & Plating
Coating, plating and other surface protection treatments according to product and application requirements.
Forming
Bending, forming and other shape modification according to drawings or order requirements.
Forging
Hot and cold forging for heavy-section bars and custom profile geometries.
Machining
Turning, drilling, milling and other machining operations where required.
Centerless Grinding
Precision centerless grinding for tight diameter tolerance and improved surface finish on bar stock.
Testing & Inspection
Mechanical, chemical and NDT testing per the applicable standard and customer specification.
Customization
Custom dimensions, lengths, surface conditions, end preparations and inspection requirements can be supplied according to project specifications. Final capability is confirmed per enquiry based on grade, size range and applicable standard.
04
Quality
Inspection and documentation procedures are coordinated to meet the requirements of the applicable product standard and the project specification.
- Dimensional inspection Geometry, dimensions and tolerances against the applicable standard
- Visual and surface inspection Surface condition, marking and overall appearance
Documents
- Inspection Report
- Chemical analysis Per heat, against the applicable standard
- Mechanical testing Tensile, yield, elongation and hardness
- Non-destructive testing UT, eddy-current, hydrostatic or other NDT as applicable
- Positive material identification PMI for alloy verification when required
Documents
- Mill Test Certificate (MTC)
- Heat number traceability Heat number carried through MTC and product marking
- Third-party inspection coordination SGS / BV / TÜV on request
Documents
- Third-Party Inspection Report
- EN 10204 documentation 3.1 MTC standard; 3.2 on request
Documents
- EN 10204 3.1 Mill Test Certificate
- EN 10204 3.2 Inspection Certificate
- Certificate of Origin
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Selection
A well-prepared specification is the most efficient defence against clarification cycles.
- 01 Select material & grade
Choose the material grade according to service conditions, performance requirements and applicable standards.
- 02 Define size & supply condition
Specify the required dimensions, surface condition, heat-treatment condition and delivery requirements.
- 03 Confirm standard & requirements
State the applicable product standard, dimensional standard and governing project specification.
- 04 Define inspection & documentation
Confirm inspection, testing, certification and documentation requirements before order placement.
Example procurement specification
A complete specification suitable for enquiry, covering product, technical requirements, certification and delivery terms.
- Product
- Inconel 718 Bars & Rods
- Grade
- Inconel 718
- Standard
- ASTM B637
- Dimensions
- Ø 25 mm x Length 6000 mm; Round; AMS 5663 (solution annealed + aged); or per drawing
- Condition
- Solution Annealed + Precipitation Hardened (AMS 5663); Turned & Polished; Mill Cut Ends
- Certification
- EN 10204 3.1 Mill Test Certificate
- Quantity
- 20 Metric Tons
- Packaging
- Seaworthy Export Packing
- Incoterm
- CIF Hamburg
06
Logistics
From mill dispatch to destination port, each stage is coordinated with the nominated forwarder and documented against the purchase specification.
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Packaging
Export-suitable packaging with surface and edge protection.
Bundled, wrapped or crated according to product form and transport mode. Outer surface protected with weather-resistant material; ends and edges shielded against transit damage.
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Loading
FCL container for standard sizes; break bulk for oversized cargo.
Container loading via nominated forwarder. LCL and dimensions outside container allowance coordinated against the mill dispatch schedule.
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Documentation
Commercial invoice, packing list and certificate of origin.
Mill documentation travels with the shipment. EN 10204 3.1 / 3.2 certificates and third-party inspection reports provided as per purchase specification.
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Shipment
Sea freight as standard; alternative routes on request.
FCL / LCL container shipment or break bulk for oversized dimensions. Logistics coordinated through the nominated forwarder.
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Delivery
FOB · CFR · CIF · FCA · EXW arrangements available.
Incoterm 2020. Port of loading: Shanghai / Ningbo / Shenzhen. Final destination and terms confirmed per enquiry.
07
FAQ
Most enquiries reduce to a small set of recurring technical questions.
01 What is Inconel 718?
Inconel 718 (UNS N07718 / NiCr19Fe19Nb5Mo3 / 2.4668) is a precipitation-hardening nickel-chromium alloy containing substantial niobium, molybdenum and titanium. In the aged condition it achieves tensile strength above 1275 MPa and retains useful creep resistance up to approximately 700 °C.
02 What is the difference between Inconel 625 and Inconel 718?
Both are nickel-chromium alloys. Inconel 625 is solid-solution strengthened (not age-hardenable) and is selected primarily for corrosion resistance in chemical, marine and offshore service. Inconel 718 is precipitation hardened and is selected for high strength at elevated temperature in aerospace, gas turbine and high-temperature fastener applications.
03 What standards cover Inconel 718 bar?
Industrial reference is ASTM B637 / ASME SB637. Aerospace references include AMS 5662 (annealed), AMS 5663 (annealed + aged) and AMS 5664 (premium grade). EN 10269 is the European reference for high-temperature fastener stock. API 6A covers Inconel 718 for oil & gas wellhead equipment.
04 What heat treatment is used for Inconel 718 bar?
Standard delivery is solution annealed (AMS 5662) for components that will be machined before final aging, or solution annealed plus precipitation aged (AMS 5663) for finished parts requiring full high-temperature strength. Aging is typically 720 °C / 8 h + furnace cool to 620 °C / 8 h, per AMS 2774.
05 What diameters are available for Inconel 718 bar?
Round bar is supplied from approximately 6 mm up to 350 mm. Smaller sizes are typically cold drawn or centerless ground, larger sizes are hot rolled or forged. Square, hex and flat sections are available on request.
06 What is the maximum service temperature for Inconel 718?
Inconel 718 is suitable for continuous service up to approximately 700 °C. Above this temperature, microstructural coarsening reduces long-term strength. For sustained service above approximately 700 °C, Waspaloy, Rene 41 or Inconel 740H are typical alternatives.