Inconel 718 (UNS N07718 / W.Nr. 2.4668 / GH4169) Nickel-Based Superalloy Ring & Hollow Bar

• Inconel 718 gamma‑double‑prime precipitation‑hardening superalloy ring & hollow bar, UNS N07718 / W.Nr 2.4668, conforms to ASTM B637, AMS 5662 / AMS 5663 industry‑aerospace specifications
• Ni‑Cr‑Fe‑Nb‑Mo‑Ti alloy system; obtains ultra‑high strength by two‑stage precipitation aging, reliable performance from cryogenic up to 650 °C working temperature
• NACE MR0175 / ISO 15156‑3 qualified; combines high mechanical strength with sour‑gas and chloride local‑corrosion resistance for oil‑gas downhole hardware
• Excellent weldability with low post‑weld cracking tendency; VIM‑VAR vacuum‑remelted premium ingot option for high‑reliability aerospace critical forgings
• Supplied in solution‑annealed soft state for full‑range CNC turning, boring, groove‑machining before two‑stage aging heat‑treatment
• Custom OD, ID, wall‑thickness, height / length; full CNC processing for ring and hollow‑bar components per CAD/PDF drawings
• Premium raw stock for aerospace turbine ring forgings, oil‑gas subsea / downhole hollow‑bar blanks, gas‑turbine casing segments and high‑strength pressure‑equipment components

This series of Inconel 718 rings and hollow bars are manufactured by hot forging / hot piercing extrusion. Raw ingot can be air‑melted or VIM‑VAR vacuum‑remelted for high‑purity requirement. Material is solution‑annealed and water quenched to get homogeneous austenitic matrix microstructure. Standard delivery is solution‑annealed soft blank for rough‑and‑finish CNC machining; full mechanical properties are achieved by subsequent standard two‑stage precipitation aging heat‑treatment.

Inconel 718 (UNS N07718 / 2.4668) is the most widely‑used precipitation‑hardening nickel‑base superalloy. Main strengthening phase is metastable γ″(Ni₃Nb) precipitates. It achieves excellent combination of high tensile strength, creep‑rupture property, fatigue performance and moderate corrosion resistance. It is approved for NACE sour‑gas service. Widely processed into rolled seamless rings, hollow‑bar sleeves, turbine‑casing segments, downhole tool blanks and high‑strength pressure‑component preforms for aerospace gas‑turbine, offshore oil‑gas, energy‑generation and high‑pressure process‑equipment industries.

• Gamma‑double‑prime (γ″) precipitation‑hardening superalloy; peak strength realized via standard two‑stage aging after solution annealing
• Stable high strength, creep‑rupture and fatigue performance, service range: cryogenic to max continuous 650 °C
• NACE MR0175 compliant; good resistance to H₂S sour‑gas, chloride pitting and stress‑corrosion‑cracking for oil‑gas downhole components
• Good weld‑process‑ability; low hot‑cracking risk, post‑weld solution‑anneal plus aging is required to restore full mechanical properties
• Optional VIM‑VAR double vacuum remelting ingot, reducing non‑metallic inclusions for aerospace critical‑part fatigue‑performance requirements
• Solution‑annealed quenched delivery guarantees low residual stress and good machinability for ring‑hollow‑bar forging blank
• Reminder: Not optimized for heavy‑reducing mineral‑acid long‑term immersion service

表格

表格

Unified Base Delivery Standard: Hot Forged / Hot Pierced, Solution Annealed, Water Quenched, Stress‑Relieved, Pickled

• Inconel Series: 600, 601, 625, 718, X‑750
• Incoloy Series: 800H / 800HT, 825, 925
• Hastelloy Series: C‑4, C22, C276, B3
• Iron‑Nickel Superalloy: A‑286 (Inconel 660), Nimonic 80A
• Heat‑Resistant Stainless: 253MA, 310S, 309S
• Super‑Austenitic: 904L, 254SMO
• Duplex / Super Duplex: 2205, S32750, S32760
• PH Stainless Steel:17‑4PH,15‑5PH
• Alloy Steel:4140, F22, F91, A105

1. Gamma‑Double‑Prime Precipitation‑Hardening High‑Strength PerformanceNi₃Nb γ″ strengthening phase delivers excellent tensile, creep‑rupture and fatigue‑resistance; maintains high mechanical performance from cryogenic up to 650 °C for gas‑turbine and high‑stress rotating‑ring components.
2. NACE‑Qualified Sour‑Gas Service Capability
   Complies with NACE MR0175 / ISO15156‑3, resistant to H₂S‑containing sour‑gas and chloride‑induced local corrosion, well‑suited for offshore oil‑gas downhole hollow‑bar & ring forgings.
3. Premium Vacuum‑Remelted Ingot Option
   VIM‑VAR double‑vacuum‑remelted raw material minimizes non‑metallic inclusions, greatly improves fatigue‑safety margin for aerospace critical ring‑hollow‑bar forgings.
4. Good Weld Compatibility
   Relatively low weld hot‑cracking risk among precipitation‑hardening superalloys; post‑weld solution‑anneal plus two‑stage aging required to restore full mechanical properties.
5. Mature‑Process Multi‑Industry Qualified Alloy
   Wide acceptance by aerospace, oil‑gas and power‑generation standards, available for both general‑industrial and high‑reliability critical‑component projects.

• Aerospace & Gas Turbine: Seamless rolled turbine ring forgings, casing‑segment blanks, high‑strength hollow‑bar pre‑forms for rotating‑static hot‑section components
• Offshore & Sour Oil‑Gas: Downhole‑tool hollow‑bar sleeves, well‑head ring‑forging parts, sour‑service high‑pressure hardware blanks
• Power‑Generation Industry: Gas‑turbine hot‑zone structural rings, steam‑turbine high‑stress hollow‑bar components
• High‑Pressure Process Equipment: Reactor high‑strength flange rings, pressure‑vessel hollow‑bar liners
• Cryogenic Engineering: Low‑temperature service ring‑hollow‑bar parts with retained high‑toughness property

We provide integrated hot‑forging / hot‑pierced hollow‑bar & seamless rolled‑ring production, full custom CNC machining per customer CAD/PDF drawings:

• Cut‑to‑length / ring‑height sizing, facing, centering, OD turning, ID boring, chamfering
• Precision threading, internal‑external groove machining, cylindrical grinding & surface polishing for ring‑hollow‑bar parts
• Custom two‑stage precipitation‑aging heat‑treatment service; VIM‑VAR vacuum‑remelted ingot sourcing for aerospace‑grade requirements
• Pickling, passivation anti‑corrosion surface finishing

We supply Inconel 718 ring forgings, hollow‑bar blanks and fully‑machined components for aerospace, offshore‑oil‑gas, power‑generation and global industrial clients.

• 100% UT ultrasonic + eddy‑current inspection for forging / piercing internal segregation, inclusion and surface crack defects
• Full‑batch tensile, yield, elongation & hardness mechanical‑property testing for each heat lot & heat‑treatment condition; NACE‑relevant hardness verification if required
• Spectrometer full‑spectrum chemical‑composition verification per heat number; trace‑element audit for VIM‑VAR vacuum‑remelted material upon request
• Metallographic inspection: check γ″‑precipitate status after aging, verify absence of harmful intermetallic phases
• High‑precision micrometer & CMM inspection for OD, ID, wall‑thickness, height / length and dimensional‑tolerance control

Mill Test Certificate EN 10204 3.1 / 3.2 can be issued and delivered together with shipment documents before delivery.

Packing ‑ Inner: Independent anti‑rust plastic sleeve + waterproof film full wrap for ring / hollow‑bar surface scratch protection ‑ Outer: Reinforced fumigated wooden pallet / wooden case with separation blocks to avoid collision & deformation ‑ Custom heavy‑duty export packaging for large‑diameter rings & heavy‑wall hollow bars available upon request

Lead Time
Normally 25‑65 working days after receiving advance payment. Exact lead time depends on ring / hollow‑bar dimension, wall‑thickness, melting‑route requirement(VIM‑VAR), order quantity and custom‑heat‑treatment / machining demands.

Please specify part type (ring / hollow bar), melting‑route (air‑melt / VIM‑VAR vacuum‑remelt), heat‑treatment requirement, OD‑ID‑wall‑thickness dimension and engineering drawings. Our superalloy‑forging metallurgy team will send competitive factory price within 24 hours. Free aerospace‑&‑sour‑gas‑service material‑matching technical consultation!