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In the production of aircraft engine turbine discs, gas turbine shafts, and high-strength fasteners for sour-gas wells, the quality of the starting stock—Inconel 718 Bar (UNS N07718 / W.Nr. 2.4668 / GH4169)—directly dictates forgeability, ultrasonic inspectability, and final component fatigue life. Shanghai COCESS Special Alloys Co., Ltd supplies precipitation-hardenable Inconel 718 in hot-rolled round bar, peeled/burnished bar, and open-die forged bar stock, fully compliant with ASTM B637, AMS 5662 (solution treated), and AMS 5663 (aged), with full traceability and optional third-party inspection (SGS / TÜV / DNV).
Inconel 718 is strengthened by coherent γ" precipitates (Ni₃Nb) formed during aging, supported by γ' (Ni₃(Al,Ti)) and Mo solid-solution hardening. Proper bar stock must have controlled macro-cleanliness (VIM+ESR preferred) and restricted S/P levels to ensure hot workability and LCF performance.
Typical Chemistry (wt%, per AMS 5662 / ASTM B637):
Nickel (Ni): 50.00 – 55.00 % (Balance)
Chromium (Cr): 17.00 – 21.00 %
Iron (Fe): 16.00 – 20.00 % (Balance / Austenite stabilizer)
Niobium + Tantalum (Nb+Ta): 4.75 – 5.50 % (Primary γ" (Ni₃Nb) former → main age-hardener)
Molybdenum (Mo): 2.80 – 3.30 %
Titanium (Ti): 0.65 – 1.15 %
Aluminum (Al): 0.20 – 0.80 %
Cobalt (Co): ≤ 1.00 %
Carbon (C): ≤ 0.08 %
Sulfur (S): ≤ 0.015 % (Tightly controlled to avoid hot cracking)
Boron (B): ≤ 0.006 %
Manganese (Mn): ≤ 0.35 %
Silicon (Si): ≤ 0.35 %
Bars are typically supplied in the solution-annealed (soft) condition for optimal machinability and forgeability, then aged by the end-user or per customer PO in our facility.
Tensile Strength (Rm): ≥ 1275 MPa (185 ksi); typical 1300–1380 MPa
Yield Strength (Rp0.2): ≥ 1035 MPa (150 ksi); typical 1100–1170 MPa
Elongation (A5): ≥ 12–15 %
Reduction of Area: ≥ 15–20 %
Hardness: 331–401 HB (34–44 HRC)
Density: 8.24 g/cm³ (0.297 lb/in³)
Service Temp Range: –253 °C to 650 °C (continuous); short excursions to 700 °C permissible depending on stress.
|
Product Form |
Standard |
Typical Size Range |
Surface / Condition |
|---|---|---|---|
|
Hot-Rolled Round Bar |
ASTM B637, AMS 5662 |
Dia. 6 – 200 mm |
Black or locally ground; Solution Ann. |
|
Peeled / Centerless Ground Bar |
ASTM B637, AMS 5663 (on request) |
Dia. 10 – 150 mm |
Peeled & polished (h11/h9 avail.); Sol. Ann. or Aged |
|
Forged Bar / Bloom / Mandrel Stock |
ASTM B637, AMS 5662 |
Dia./Section 80 – 350+ mm (sq/rd) |
Rough turned or black; Sol. Ann. |
|
Cut-to-Length Bars |
Per PO |
Any diameter, ±3 mm or per drawing |
Saw cut, deburred |
Custom lengths, rough turning, and drilled center holes available upon request.
Shanghai COCESS Special Alloys Co., Ltd provides more than raw stock:
Pre-Processing: Saw cut to length, rough turn O.D. / face ends, drill center holes to reduce your in-house cycle time.
Heat Treatment: In-house solution anneal (955–980 °C / rapid quench) and double-aging (720 °C × 8h → furnace cool to 620 °C × 8h) with documented curves.
Non-Destructive Testing (NDT): Ultrasonic Testing (UT per ASTM A388 / SEB 682 / GB/T 4162 Class A or B), Magnetic Particle Inspection (MT), Liquid Penetrant Testing (PT)—especially critical for aerospace disc stock.
Certification: Every lot ships with EN 10204 3.1 Mill Test Report (heat analysis + mech tests + heat treat record). EN 10204 3.2 and third-party witness available on request.
NACE Compliance: Material verified per NACE MR0175 / ISO 15156 for sour-service oil & gas applications (SSC resistant).
Aerospace & Defense: Turbine discs, compressor discs, spacer forgings, blade roots, engine mounts, high-temp fasteners, rocket engine turbopump components.
Power Generation: Industrial gas turbine (IGT) discs, bolts, and nuclear reactor internals.
Oil & Gas / Subsea: Mandrels, packers, hanger components, and high-strength bolts in H₂S/CO₂/Cl⁻ sour environments.
High-Performance Auto & Racing: Turbocharger wheels, exhaust valves, connecting rods.
For Inconel 718 round bar, peeled bar, or forged bar stock—including current inventory sizes, mill test report samples, or a formal quotation—please contact Shanghai COCESS Special Alloys Co., Ltd. Our technical team can advise on heat-treatment cycles, allowable forging reduction ratios, and NDT requirements to ensure your specification is met without compromise.
Website: https://en.cocessalloys.com
Email: sales@cocessalloys.com
