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Hastelloy X

Material: Hastelloy X, UNS N06002, 2.4665

Hastelloy X is a nickel-based alloy with good oxidation and corrosion resistance, medium and long-lasting strength below 900°C, and good cold and hot processing formability and welding performance. It is suitable for manufacturing combustion chamber and other high-temperature components of aircraft engines, with long-term use below 900°C and short-term working temperature reaching 1080°C.

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What Is Hastelloy X?

Hastelloy X (UNS N06002) is a nickel-chromium-iron-molybdenum superalloy designed for extreme high-temperature and corrosive environments. Developed by Haynes International, it combines oxidation resistance, creep strength, and fabricability for applications exceeding 1,000°C (1,832°F).

Hastelloy X Composition

Grade	C≤	Mn≤	P≤	S≤	Si≤	Cr	Mo	Fe	Co≤	Ni	W
Hastelloy X	0.05-0.15	1.0	0.04	0.03	1.0	20.5-23.0	8.0-10.0	17.0-20.0	0.5-2.5	Remain	0.2-1.0

Hastelloy X Physical Properties

Properties	Value
Density (g/cm³)	8.28
Melting point (℃)	1295, 1381
Thermal conductivity ( λ (W/m*℃) )	13.38 (100℃)
Specific heat capacity (J/kg*℃)	372.6
Elastic modulus (GPa)	199
Resistivity (μΩ*m)	1.18
Linear expansion coefficient (a/10^-6℃^-1)	12.1 (20-100℃)

Hastelloy X Mechanical Properties

Mechanical properties	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)
Hastelloy X	95[655]	32[240]	35

Hastelloy X Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS
Hastelloy X	2.4665	N06002

Hastelloy X Features

Hastelloy X possesses an exceptional combination of oxidation resistance, formability and high temperature strength.
It has also been found to be exceptionally resistant to stress-corrosion cracking.
Alloy X exhibits good ductility after prolonged exposure at temperatures of 1200, 1400, 1600 °F for 16,000 hours.
It has excellent formability and welding characteristics.
Hastelloy X can be forged and, because of its good ductility, can be cold-worked.
It can be welded by both manual and automatic welding methods including shielded metal-arc (coated electrodes), gas tungsten-arc (TIG), and gas metal-arc (MIG). Alloy X can also be resistance-welded.

Hastelloy X Specifications

Product Name	Standard	Show
Pipe/Tube	AMS 5587 AMS 5588 ASTM B619 ASTM B622
Sheet/Plate	ASTM B435
Bar /Rod	ASTM B572
Forging	AMS 5754 GE B50TF31
Fittings	ASTM B366
Weld Wire	A5.14 ERNiCrMo-2
Weld Electrode	A5.11 ENiCrMo-2

Hastelloy X Application:

Hastelloy X is widely used in various high temperature environments due to its corrosion resistance in various atmospheres at high temperatures and its excellent high temperature strength.

Industrial and aviation steam turbines (combustors, rectifiers, structural covers).
Industrial furnace components, support rolls, grids, ribbons and radiant tubes.
Spiral tubes in petrochemical furnaces.
High temperature gas cooling nuclear reactor.

FAQs

Q1: Is Hastelloy X Magnetic?

A: Hastelloy X (UNS N06002) is non-magnetic in the annealed condition. However, cold working may induce slight magnetism from strain-induced martensite. In most cases the magnetism is almost non-existent.

Q2: Is Hastelloy X Precipitation Hardened?

A: No, Hastelloy X is solid-solution strengthened, NOT precipitation hardened.

Q3: Difference Between Inconel 625 vs Hastelloy X

Property	Hastelloy X (UNS N06002)	Inconel 625 (UNS N06625)
Composition	Ni-Cr-Fe-Mo (+W/Co)	Ni-Cr-Mo-Nb (+Ta)
Key Strengthening	Solid-solution (Mo/W)	Precipitation (Nb/Ta γ'' phase)
Max Service Temp	2200°F (1200°C)	1800°F (980°C)
Creep Strength (982°C)	12,000 psi	7,000 psi
Corrosion Focus	Oxidation/sulfidation resistance	Aqueous corrosion (pitting/Cl⁻)
PREN	~35	~55
Primary Applications	Combustors, furnace hardware	Marine, chemical processing