Nickel Alloy (718)

Description

1. Product Overview

Nickel Alloy 718 is a precipitation-hardened, nickel-chromium superalloy engineered for sustained mechanical integrity under extreme temperatures and corrosive conditions, commonly specified for aerospace, energy, and deep-well exploration. Its primary industrial use lies in high-stress, high-temperature components such as turbine discs, gas compressor blades, and subsea bolting systems. The key value proposition is exceptional creep resistance and tensile strength up to 1300°F (700°C), combined with superior weldability compared to other superalloys. Strategically, this alloy is critical for industries transitioning to higher-efficiency turbine engines and deeper hydrocarbon extraction, where material failure is operationally catastrophic.

2. Key Specifications & Technical Characteristics

• Chemical Composition (ASTM B637 / AMS 5662):
  Ni (50–55%) | Cr (17–21%) | Fe (balance) | Nb+Ta (4.75–5.5%) | Mo (2.8–3.3%) | Ti (0.65–1.15%) | Al (0.2–0.8%) | Co ≤1%

• Purity / Grade: Aerospace-grade / API 6A 718 (for downhole service); impurity limits: P ≤0.015%, S ≤0.015%

• Physical Characteristics:

  • Form: Solid round bar, forgings, plate, wire, or custom near-net shapes

  • Color / Finish: Dark oxidized mill scale (as-rolled) or bright machined surface

  • Particle size: N/A (bulk solid metal) | Density: 8.19 g/cm³

• Packaging Options:

  • Steel-banded wooden crates (≤2 MT per crate)

  • Corrosion-inhibiting VCI plastic wrap + export-grade plywood cases

• Shelf Life: Indefinite when stored indoors (5–35°C, RH <60%); no chemical degradation

3. Core Industrial Applications

• Aerospace & Gas Turbines:
  Turbine discs, casings, and thrust reversers — Alloy 718 outperforms Waspaloy or Rene 41 in weld-repair cycles, reducing scrap by 20–30% during manufacturing.

• Oil & Gas (Downhole & Subsea):
  Wellhead hangers, blowout preventer stems, and packers — its resistance to H₂S-induced stress corrosion cracking (NACE MR0175 compliance) delivers 3x longer service life than 17-4PH stainless under sour gas conditions.

• Nuclear & Power Generation:
  Reactor core support pins and superheater tubing — maintains yield strength >1,000 MPa at 650°C, outperforming Inconel 625 in thermal fatigue resistance by 15% in cyclic service.

• Cryogenic & Tooling:
  Bolting for LNG plants and injection molds — no ductile-to-brittle transition down to -250°C, eliminating failure risk compared to martensitic steels.

Efficiency advantage: Its delayed age-hardening response (72+ hrs at 620°C) allows complex machining and welding before final heat treatment, reducing machining costs by up to 25%.

4. Competitive Advantages

• Quality Consistency: Lot-to-lot chemistry control via ICP-OES and spark analysis; each melt includes 3rd-party certified mill test reports (MTR) per EN 10204 3.1.

• Supply Reliability: Stocked inventory of 120+ MT across three continents (Houston, Rotterdam, Shanghai); typical lead time 7–14 days for standard shapes.

• Logistics Capability: Dedicated hazardous goods not required (non-hazardous metal); direct container loading with anti-tilt blocking and load-securing plans to ASTM D4169.

• Price Competitiveness: Volume contract pricing within 3–5% of LME nickel basket, with fixed quarterly ceilings — no spot-market volatility surcharges.

• Sustainability: Certified recycled content (35–50%) via electric arc furnace remelt; Scope 3 emissions data available per ISO 14067.

• Technical Support: Free FEA material cards (ANSYS/Abaqus), weld procedure recommendations (GTAW with Inconel 718 filler), and on-site metallurgical audit available for ≥20 MT orders.

Strategic sourcing position: Replace multi-vendor alloy sourcing with single, audited supply partner — reducing qualification costs and variability risk.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): BULK 20 MT (mixed dimensions permitted; ≤3 distinct sizes per PO)

• Loading Capacity (per standard 20FT container):

  • Solid round bars (max length 3m): 22–24 MT (floor-loaded + dunnage)

  • Forgings / irregular shapes: 18–20 MT (pallettized)

  • Plate / sheet nested: 24 MT

*Note: Larger shipments (break-bulk or full vessels) available for contract volumes >100 MT. Special lot splits and just-in-time delivery schedules negotiable with 6-month commitment.*