Inconel 625(Ni-Cr-Mo-Nb-Ta)

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1. Introduce

– Nickel-based solid solution superalloy with a Ni-Cr base strengthened by the addition of Nb/Mo solid solution strengthening elements

– Excellent strength and toughness at about 980℃ and good oxidation and corrosion resistance

– Excellent ductility and toughness at about -196°C
→ Solid solution strengthening effect of refractory metals Nb, Mo in Ni-Cr base

– UNS N06625

* Inconel

Features
– Resists oxidation and submersion in oxidizing and sulfurizing atmospheres above 900℃
– Non-corrosive to organic and salt solutions
– Excellent mechanical properties such as tensile and yield strength up to about 600℃
Applications
– High temperature heat resistant equipment(Heat treatment furnace, boiler, jet engine parts, electric heater parts)
Types
– Incoenl 600/601, Inconel 625, Inconel 690, Inconel 718, Inconel 718+, Inconel X-750, etc.

* UNS

Abbreviation for Unified Numbering Systems for Metals and Alloys
Unified unique numbering system for metals and alloys
A representative number that is compatible with metals and alloys defined in many material-related codes such as ASTM, AISI, ASME, AWS, etc.

* N : Nickel and Nickel Alloys

* UNS N06625 : 06XXX : Chromium(Hastelloy, Nichrome, Inconel and etonite, some with additional element)

2. Property

– Good high temperature strength, creep resistance, corrosion resistance, oxidation resistance, fatigue strength, stress corrosion cracking resistance
– Good machinability and weldability, no susceptibility to cracking after welding

Element	Impact
Cr	Provides corrosion resistance, oxidation resistance
Mo	Highly reinforced element, high temperature oxidation resistance, cryogenic oxidation resistance, weldability
Nb	Highly strengthened element, provides strength
Ta	Highly strengthened, provides enhanced creep resistance, heat resistance, corrosion resistance

[Inconel 625 Chemical Composition (%)]

Ni	Cr	Fe	C	Al
54.91 ~ 68.85	20.00 ~ 23.00	Max. 5.00	Max. 0.10	Max. 0.40

Ti	Si	Mn	Mo	S
Max. 0.40	Max. 0.50	Max. 0.50	8.00 ~ 10.00	Max. 0.02

Co	Nb	P
Max. 1.00	3.15 ~ 4.15	Max. 0.02

[Inconel 625 Mechanical Composition]

Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)
724 ~ 1104	290 ~ 759	30 ~ 65

[Inconel 625 Physical Properties]

Density (g/㎤)	Melting Range (℃)	Specific Heat (0-100℃), J/kg*℃	Curie Temperature (℃)
8.44	1290 ~ 1350	402	-196

3. Standard & Specification

– Specification : UNS N06625

Product Form	ASTM	SAE	AWS
Bar, Rod	B166, B446	–	–
Plate, Sheet, Strip	B168, B906, B443	–	–
Tube, Pipe	B444, B167, B829, B517, B775, B516, B751, B704, B705	AMS 5581	–
Wire	B166, B446	–	A5.14 ERNiCrMo-3
Fittings	B366	–	–
Forgings	B472, B564	–	–

4. Available Form

– Bar, Rod

– Plate, Sheet, Strip

– Wire, Weld Rod

– Forgings

– Tube, Pipe

5. Application & Product

– Aerospace, Desulfurization, Chemical, Marine

Application	Product
Aerospace	Rocket engine combustion chamber tubes, Compressor vanes, Turbine seals, Thrust chamber piping for rockets, Aero engines
Desulfurization	Absorption towers, Reheaters, Exhaust gas inlet barriers, Fans (moisture), Agitators, Deflectors
Chemical	Piping, Valves, Reactors, Heat exchangers, Tubing for heat exchangers
Marine	Submarine communication cables, Exhaust ducts for submarines and boats, Bellows for underwater control devices