Introduction

Incoloy A‑286 Nickel Alloy (UNS S66286) is a precipitation‑hardenable stainless steel that retains high strength up to 700°C, exceeding conventional austenitic stainless steel like Type 304. This A‑286 superalloy contains higher nickel content and precipitates the γ' phase [Ni₃(Al,Ti)] during service, resulting in a reinforced metal at elevated temperatures. As an A‑286 precipitation hardening alloy and nickel iron chromium alloy A‑286, it is widely used in aerospace, fasteners, and gas turbine parts where high strength and creep resistance are required.

Chemical components (%)

Mechanical properties

Physical properties

INCOLOY A‑286 Nickel Alloy Available Products and Standard

1. ASTM A453 / A638 (Standard Specification for High‑Temperature Bolting / Iron‑Base Superalloy Bars and Forgings)

Grade: Grade 660 Class A / Class B / A‑286 precipitation hardening alloy

Type: Bar / Wire / Forgings / Tubing / Ring

Size Range:

Bar (Round / Hex / Square): 3 – 800 mm dia (cold drawn or hot rolled)

Wire: 0.025 – 21 mm dia (coils, spools or straight bars)

Forgings: Custom sizes (blocks, discs, rings)

Tubing / Rings: Custom dimensions

Surface: Annealed, Bright, Pickled, Ground

Testing: Tensile test, yield test (0.2% offset), elongation test, reduction of area test, hardness test (Brinell / Rockwell), stress rupture test (100 hours at 650°C), chemical analysis, dimensional inspection

Reference Specifications: AMS 5731, AMS 5732, AMS 5734, AMS 5737, AMS 5525, AMS 5853, AMS 5858, NACE MR0175

2. GB/T 14992 (High‑Temperature Alloys – Classification and Grade)

Grade: GH2132 (GH132) / INCOLOY A‑286 material / X6NiCrTiMoVB25‑15‑2

Type: Wire / Strip / Bar / Sheet / Plate / Forgings

Size Range:

Bar: 3 – 550 mm dia (hot rolled or forged)

Wire: 0.1 – 15.0 mm dia (coils or straight)

Strip: 0.01 – 5.0 mm thick × 5 – 500 mm wide (coils)

Sheet / Plate: 0.1 – 100 mm thick (cold rolled or hot rolled)

Surface: Annealed, Bright, Pickled, Ground

Testing: Tensile test, yield test, elongation test, hardness test, creep test, chemical analysis, non‑destructive testing (ultrasonic / eddy current), dimensional inspection

Advantages

(1)Exceptional high‑temperature strength up to 700°C: As an A‑286 superalloy and nickel iron chromium alloy A‑286, it retains significant mechanical strength and creep resistance at temperatures up to 700°C, exceeding conventional austenitic stainless steel like Type 304. The precipitation of γ' phase [Ni₃(Al,Ti)] during service reinforces the metal at elevated temperatures.

(2)Excellent age‑hardenable properties: This A‑286 precipitation hardening alloy responds well to heat treatment, achieving high tensile and yield strength while maintaining good ductility. It is a true age hardenable alloy that can be readily formed into complex shapes without cracking.

(3)Good corrosion resistance: This A‑286 corrosion resistant alloy offers superior resistance to oxidation, scaling, and stress corrosion cracking compared to standard stainless steels, especially in chloride‑containing and high‑temperature service conditions. It is also NACE MR0175 compliant for sour gas service.

Applications

(1)Aerospace industry – Widely used in jet engine parts, turbine blades, casings, afterburner components, and high‑temperature fasteners. This UNS S66286 nickel alloy is a trusted A‑286 alloy for aerospace where both high strength and creep resistance are critical.

(2)Oil and gas sector – Applied in downhole equipment, subsea components, valves, and fasteners requiring both high strength and corrosion resistance. As an INCOLOY A‑286 material compliant with NACE MR0175, it performs reliably in sour gas environments.

(3)Industrial gas turbines and chemical processing – Ideal for gas turbine discs, shafts, rings, and other rotating parts. In chemical processing, it is specified for valves, pumps, and fittings where INCOLOY A‑286 fastener alloy or general INCOLOY A‑286 high temperature alloy is needed to withstand aggressive media and elevated temperatures.

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