Inconel 660 Precipitation-Hardening Iron-Nickel Forged Bar

Product Highlights

• Inconel 660 (A‑286) iron‑nickel‑base precipitation‑hardening forged bar, UNS S66286 / W.Nr 1.4980, compliant with ASTM A453 Grade 660 & AMS aerospace specifications
• Ti‑Mo‑V‑B alloy‑strengthened superalloy; excellent creep‑rupture strength for long‑term service up to 700 °C
• Two standard solution‑treatment options (Class A / Class B), obtain target properties after precipitation aging heat‑treatment
• Good oxidation resistance at elevated temperature; stable mechanical performance from cryogenic to high‑temperature working conditions
• Supplied in solution‑treated soft forged blank state for full‑range CNC rough & finish machining prior to aging
• Optional VIM‑VAR vacuum remelted ingot for high‑reliability aerospace critical components, minimizing non‑metallic inclusions
• Custom diameter, length & full‑scope CNC turning, milling, threading per customer CAD/PDF drawings
• Premium forged raw stock for high‑temperature fasteners, gas‑turbine hardware, exhaust components, petrochemical and power‑generation equipment parts

Product Overview

This series of Inconel 660 (A‑286) forged bars are manufactured by open‑die / closed‑die forging from air‑melted or VIM‑VAR vacuum‑remelted ingots, followed by solution treatment and rapid quenching to achieve homogeneous austenitic matrix microstructure. Standard delivery is solution‑treated soft forged blank ready for CNC machining. Final high‑temperature mechanical properties are achieved by subsequent precipitation aging heat‑treatment.

Inconel 660 also widely known as A‑286, is precipitation‑hardening iron‑nickel‑chromium superalloy. Titanium‑molybdenum together with vanadium‑boron micro‑alloying forms gamma‑prime precipitates to deliver outstanding creep‑rupture performance under sustained high‑temperature load. Two mainstream solution cycles: Class A(899 °C) for higher room‑temperature ductility; Class B(982 °C) optimized for maximum creep‑rupture strength at elevated temperature. Widely processed into high‑temp bolts & studs, gas‑turbine component blanks, engine exhaust hardware, thermal‑system springs and petrochemical high‑temperature fixtures for aerospace, gas‑turbine, power‑generation and heavy‑duty thermal‑process industries.

Material Grade Characteristics – Inconel 660 (A‑286, UNS S66286 / 1.4980)

• Iron‑nickel‑base precipitation‑hardening superalloy, strength improved by γ‑prime phase precipitates after aging treatment
• Two standard solution‑treated baseline conditions: Class A (899 °C) for good room‑temp ductility; Class B (982 °C) for superior high‑temperature creep‑rupture performance
• Excellent creep‑rupture strength & oxidation‑resistance for continuous service up to 700 °C
• Vanadium‑boron micro‑alloying stabilizes grain boundaries and improves stress‑rupture ductility
• Vacuum‑remelted VIM‑VAR melting route available for aerospace critical‑part low‑inclusion requirements
• Acceptable weldability; post‑weld full solution‑treat plus aging is recommended for maximum high‑temperature service performance
• Not suitable for heavy sulfur‑containing corrosive flue‑gas environments

Chemical Composition (Weight %)

Mechanical Properties (ASTM A453 / AMS 5732 Heat‑Treatment States)

Unified Base Delivery Standard: Forged, Solution Treated, Stress‑Relieved, Pickled

Related Material Grades

• Iron‑Nickel Superalloy: A‑286 (660), Nimonic 75, Nimonic 80A, Nimonic 90
• Inconel Series: 600, 601, 625, 718, X‑750
• Incoloy Series: 800H / 800HT, 825, 925
• Hastelloy Series: C4, C22, C276, B3
• Heat‑Resistant Stainless: 253MA, 310S, 309S
• PH Stainless Steel:17‑4PH,15‑5PH
• Alloy Steel: 4140, F22, F91, A105

Key Advantages

1. Outstanding Elevated‑Temperature Creep‑Rupture PerformanceGamma‑prime precipitation hardening delivers sustained high strength and creep‑resistance for long‑term service up to 700 °C, ideal for gas‑turbine and cyclic‑thermal‑load components.

2 Dual Solution‑Treatment Grade Selection
Class‑A solution for higher room‑temp ductility; Class‑B solution optimized for maximum high‑temperature creep‑rupture property to match different component design requirements.

3 Vacuum‑Remelted Premium Ingot Option
VIM‑VAR vacuum remelting greatly reduces non‑metallic inclusions for high‑reliability aerospace critical forgings.

4 Good High‑Temperature Oxidation Resistance
Forms stable protective oxide scale under repeated heating‑cooling cycles for hot exhaust and furnace hardware.

5 Flexible Fabrication Route
Solution‑treated forgings offer adequate machinability; full post‑weld solution‑treat plus aging recommended for high‑temp service assemblies.

Typical Applications

• Aerospace & Gas Turbine: High‑temperature bolts & studs, turbine‑section fixture blanks, turbo‑component forged preforms
• Automotive Thermal System: High‑performance engine exhaust fasteners, hot‑zone spring raw stock
• Power‑Generation Industry: Steam‑plant high‑stress hot‑bolting, boiler thermal‑cycling fixture forgings
• Petrochemical Thermal Equipment: Reactor high‑temperature support components, hot‑process hardware blanks
• Industrial Furnace: High‑load hot fixture forgings working under continuous elevated‑temperature creep load

Processing Service

We provide open‑die / closed‑die Inconel 660 (A‑286) forging production, full custom CNC machining per customer CAD/PDF drawings:

• Cut‑to‑length, facing, centering, external turning & chamfering
• Precision threading, spline machining, cylindrical grinding & surface polishing
• Custom Class‑A / Class‑B solution treatment plus precipitation‑aging heat‑treatment service
• VIM‑VAR vacuum‑remelted ingot sourcing for aerospace‑grade requirements; pickling & passivation finishing

We supply Inconel 660 (A‑286) forged bar blanks and semi‑finished machined forgings for aerospace, power‑generation, automotive and petrochemical global industrial clients.

Quality Assurance

• 100% UT + Eddy‑Current dual inspection for forging internal segregation, inclusion and crack defects
• Full‑batch tensile, yield, elongation & hardness mechanical testing for each heat lot & heat‑treatment condition
• High‑precision micrometer & CMM for diameter, straightness & dimensional‑tolerance control
• Spectrometer full‑spectrum chemical‑composition verification per heat number; trace‑element audit for VIM‑VAR vacuum‑remelted material if required
• Metallographic austenite‑matrix & gamma‑prime precipitate microstructure inspection after aging heat‑treatment

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

Packing & Delivery

Packing ‑ Inner: Independent anti‑rust plastic sleeve + waterproof film full wrap for forging‑surface scratch protection ‑ Outer: Reinforced fumigated wooden pallet with separation strips to prevent collision & bending deformation ‑ Custom heavy‑duty export wooden case for large‑size / heavy‑weight forgings available upon request

Lead Time
Normally 20‑60 working days after receiving advance payment. Exact lead time depends on forging section size, weight, melting route(VIM‑VAR option), order quantity and custom heat‑treatment / machining demands.

Request Custom Quotation

Please specify melting route (air‑melt / VIM‑VAR vacuum remelt), heat‑treatment requirement(Class A / Class B + aged), forging dimension and engineering drawings. Our superalloy forging metallurgy team will send competitive factory price within 24 hours. Free high‑temperature‑service material‑matching technical consultation!