ASTM B637 Alloy 718 Round Bar | UNS N07718 | Inconel 718

ASTM B637 Alloy 718 Round Bar | UNS N07718 | Inconel 718

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies Nickel Alloy 718, also known as Inconel 718, identified as UNS N07718 and Werkstoff 2.4668, in round bar and rod form according to ASTM B637 / ASME SB-637 and aerospace standard AMS 5662.

Nickel Alloy 718 is a precipitation-hardenable nickel-chromium alloy containing significant amounts of iron, niobium, and molybdenum, along with aluminum and titanium. The alloy is designed for high-temperature service and achieves its characteristic high strength through a precipitation aging heat treatment that forms strengthening phases within the austenitic matrix. The sluggish precipitation hardening response allows the alloy to be readily welded without hardening or cracking. Alloy 718 maintains high strength and good ductility up to 704°C (1,300°F) with oxidation resistance to 982°C (1,800°F), and also exhibits excellent tensile and impact strength at cryogenic temperatures.

Composition per ASTM B637 / AMS 5662 requirements.

Actual properties depend on product form, dimensions, heat-treatment cycle, and the specified standard.

Solution Annealed (AMS 5662 / ASTM B637)

Material is normally supplied in the solution annealed condition. Solution treatment temperature: 1,725°F – 1,850°F (940–1,010°C) followed by air cooling. Recommended when the material requires forming, welding or rough machining. Typical tensile strength: 120 – 140 ksi (830 – 965 MPa).

Solution Annealed and Aged (AMS 5663)

Used when the finished component requires the characteristic high strength of Alloy 718. A commonly used aging cycle includes holding at 1,325±25°F (718±14°C) for 8 hours, furnace cooling at approximately 100°F/hr to 1,150±25°F (621±14°C), holding for a total aging time of 18 hours, and final air cooling.

Typical aged properties per ASTM B637: tensile strength 185 ksi (1,275 MPa) minimum, yield strength 150 ksi (1,034 MPa) minimum, elongation 12% minimum.

Alternative Solution Treatment (AMS 5664)

For tensile-limited applications requiring improved transverse ductility in heavy sections. Solution treatment: 1,900°F – 1,950°F (1,038–1,066°C) followed by aging at 1,400°F (760°C) for 10 hours, furnace cool to 1,200°F (650°C), hold for total aging time of 20 hours, air cool.

Alloy 718 provides excellent resistance to chloride stress corrosion cracking and general corrosion in many oil and gas and chemical environments. The additions of niobium and molybdenum, along with aluminum and titanium, result in excellent corrosion resistance in oil and gas applications and high strength properties.

Key Corrosion Characteristics:

• Resistant to chloride stress-corrosion cracking
• Good oxidation resistance up to 982°C (1,800°F)
• Good resistance to many aqueous and chemical environments
• Excellent fatigue and creep-rupture resistance at elevated temperatures
• Good weldability without post-weld cracking

Selection Considerations:

• Provides useful resistance in many chloride-containing environments
• Not immune to pitting or crevice corrosion in all conditions
• For aggressive acid service, Alloy 625, C-276 or Alloy 22 may be preferable
• Final selection must consider medium, concentration, temperature, pressure and oxidizing or reducing conditions
• NACE MR0175 / ISO 15156 compliance is not automatic – depends on controlled chemistry, heat treatment, hardness and environmental verification

• Aerospace: Gas turbine disks, engine parts, high-strength fasteners, structural components
• Oil and Gas: Downhole tools, wellhead components, subsea equipment, valves, pump shafts
• Power Generation: Land-based turbine engines, nuclear reactor components
• Industrial: High-strength shafts, springs, rotating components, fasteners
• Cryogenic Applications: Components operating at -200°C

Available quality-control services include:

• Heat-number traceability
• Chemical composition verification
• Tensile, yield and elongation testing
• Hardness inspection
• Dimensional and surface inspection
• Positive Material Identification (PMI)
• Ultrasonic testing
• Dye penetrant inspection
• Heat-treatment records
• EN 10204 3.1 material certificate

PMI can identify major alloying elements but cannot independently verify carbon content, heat-treatment condition, mechanical properties or NACE compliance.

For an accurate quotation, please provide:

Alloy Grade · Standard · Product Form · Diameter · Length · Quantity · Heat Treatment · Inspection Requirement · Application · Working Temperature · Destination Port

For corrosive or sour-service projects, also provide:

Chemical Medium · Concentration · Pressure · Chloride Content · H₂S Conditions · Oxidizing or Reducing Environment

• Request ASTM B637 Alloy 718 Bar Quote
• Upload Drawing or MTO
• Check Available Stock
• Ask for Alloy Selection Support

ASTM B637 Alloy 718 round bar (UNS N07718) is a precipitation-hardenable nickel-chromium alloy bar designed for high-temperature service with high tensile strength, creep resistance, and oxidation resistance up to 982°C.

The UNS designation is N07718; the European Werkstoff number is 2.4668; the EN material symbol is NiCr19Fe19Nb5Mo3.

ASTM B637 / ASME SB-637 and AMS 5662 apply to Alloy 718 round bar, rod and forgings. For plate and sheet, ASTM B670 applies.

Stock diameters range from approximately 12.50 mm (0.492") to 254 mm (10.0"), with custom sizes available on request.

Yes. Full strength is developed through precipitation aging. ASTM B637 specifies the material is supplied in the annealed condition but must be capable of meeting mechanical properties after precipitation hardening.

A typical aging cycle is 1,325°F (718°C) for 8 hours, furnace cool to 1,150°F (621°C), hold for total 18 hours, air cool.

In the aged condition, tensile strength is 185 ksi (1,275 MPa) minimum, yield strength is 150 ksi (1,034 MPa) minimum, and elongation is 12% minimum.

Alloy 718 maintains high strength to 704°C (1,300°F) and offers oxidation resistance up to 982°C (1,800°F).

Yes. Alloy 718 exhibits good weldability and resistance to post-weld cracking. Welding should be performed in the solution-annealed condition using qualified welding procedures.

Please provide the standard (ASTM B637), product form (round bar), diameter, length, quantity, heat-treatment condition, inspection requirements, application, working temperature and destination port.