Is Inconel® 625 the same as Nickel 625?

In terms of chemical properties, mechanical properties, and applications, Inconel® 625 and Nickel 625 are similar, meeting the same quality standards. However, Inconel® is a trademark owned exclusively by Special Metals Corporation.

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There remains some confusion among buyers, engineers, and processors regarding superalloys. Frequently, documents refer to Inconel® 600, while factory test reports may call it Nickel 600 or ATI® 600. Can one be substituted for the other?

The answer is a definite yes. ASTM and AMS specifications govern the manufacture of these high-performance alloys. Reputable manufacturers ensure that their materials comply with stringent guidelines. The crucial aspect of the name is not the prefix but the alloy number itself.

Why the Names?

Most high-temperature alloys were developed to meet the demands of aerospace engines, which required increased power, reliability, and durability. This need drove the development of machined metal parts that exceeded previous technological capabilities.

Nickel superalloys were created for applications involving high pressure, corrosive environments, and high kinetic energy. Mills that first produced these alloys trademarked their names when the patents were granted. Although those patents have now expired, the trademarked names are still widely used.

Summary

Most distributors opt for generic designations, such as “Nickel 400” instead of “Monel® 400,” or “Alloy C-276” instead of “Hastelloy® C-276.” This practice occurs because the patents for these high-quality nickel alloys have lapsed.

Ultimately, the important factor is that materials in the supply chain used for products impacting our lives are manufactured to high-quality standards and certified to meet internationally recognized specifications.

Difference Between Nickel and Inconel

Nickel Vs Inconel

Nickel

Nickel 200 and Nickel 201 are commercially pure nickel alloys with a minimum nickel content of 99%. Alloy 200 is designated as UNS N and Werkstoff Number 2. It is utilized in manufacturing processing equipment and is ideal for maintaining product purity while handling foods, synthetic fibers, and alkalis. Nickel 200 is typically limited to applications below 600°F. At higher temperatures, it may experience graphitization, compromising its properties. Additionally, Alloy 200 can be easily welded via conventional processes, except for oxyacetylene methods.

Nickel Alloy Composition

Nickel alloy material properties

Compositions of some common nickel alloys

UNS No

Al

Cr

Co

Fe

Mo

Ni

Nb+Ta

Ti

W

N 15.5 5.5 16 57 3.8

Typical properties of some common nickel alloys

UNS No

Condition

UTS (MPa)

0.2 Proof Stress (MPa)

Elong. On 5cm (%)

Hardness (HB)

hr Ruptire Str. 750°C (MPa)

N

Annealed

790

415

50

184

N/a

Trade Names and Owners of Nickel Alloys

• HASTELLOY is a registered trade name of Haynes Intl.
• INCOLOY, INCONEL, MONEL, and NIMONIC are registered trade names of the INCO family of companies.
• INVAR is a registered trademark of Imphy S.A.
• MU-METAL is a registered trademark of Telcon Metals Ltd.
• NICORROS and NICROFER are registered tradenames of Krupp UM GmbH.

Inconel

Inconel® is a registered trademark of Special Metals Corporation, representing a family of austenitic nickel-chromium superalloys. It is optimized for the most demanding conditions encountered in manufacturing. Inconel differs from titanium, which is a lustrous transition metal with the symbol Ti and atomic number 22.

Inconel Material Specification

• Inconel 600: Solid solution strengthened.
• Inconel 601
• Inconel 625: Acid resistant with good weldability. The LCF version is typically used in bellows, making it ideal for components in the power, aerospace, and chemical processing industries. Available in sheet, plate, bar, and forgings.
• Inconel 718: Gamma double prime strengthened with good weldability, preferred for cryogenic storage tanks, turbines, downhole shafts, and wellhead parts, available in sheet, plate, and bar.
• Inconel X750: Commonly used for gas turbine components, including blades, seals, and rotors.
• Inconel 907
• Inconel 909
• Inconel 706
• Inconel 617
• Inconel 751: Increased aluminum content for improved rupture strength.
• Inconel 792: Enhanced high-temperature corrosion properties, particularly for gas turbines.
• Inconel 939: Gamma prime strengthened for increased weldability.
• Inconel 188: Readily fabricated for aerospace applications, available in sheet, plate, and bar.
• Inconel 690: Low cobalt content for nuclear applications and low resistivity.
• Inconel 713C: Precipitation hardenable nickel-chromium base cast alloy.
• Inconel 230: Widely used in power, aerospace, and industrial heating industries.

Inconel Composition

Inconel Element (% by mass) Ni Cr Fe Mo Nb Co Mn Cu Al Ti Si C S P B 600 72.0 14.0-17.0 6.0-10.0 1.0 0.5 0.5 0.15 0.015 617 44.2-56.0 20.0-24.0 3.0 8.0-10.0 10.0-15.0 0.5 0.5 0.8-1.5 0.6 0.5 0.15 0.015 0.015 0.006 625 58.0 20.0-23.0 5.0 8.0-10.0 3.15-4.15 1.0 0.5 0.4 0.4 0.5 0.1 0.015 0.015 690 59.5 30 9.2 0.35 0.01 0.02 0.35 0.019 0.003 718 50.0-55.0 17.0-21.0 balance 2.8-3.3 4.75-5.5 1.0 0.35 0.2-0.8 0.65-1.15 0.3 0.35 0.08 0.015 0.015 0.006 X-750 70.0 14.0-17.0 5.0-9.0 0.7-1.2 1.0 1.0 0.5 0.4-1.0 2.25-2.75 0.5 0.08 0.01

Inconel alloys

Alloys of Inconel include:

• Inconel 600: Solid solution strengthened
• Inconel 601
• Inconel 625: Acid resistant with excellent weldability.
• Inconel 690: Low cobalt content for nuclear applications, and low resistivity
• Inconel 713C: Precipitation hardenable nickel-chromium base cast alloy
• Inconel 718: Gamma double prime strengthened with good weldability
• Inconel 751: Increased aluminum content for enhanced rupture strength
• Inconel 792: Improved high-temperature corrosion properties, used particularly in gas turbines
• Inconel 939: Gamma prime strengthened for increased weldability

Inconel Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS	GOST	AFNOR	JIS	BS	EN	OR
Inconel 600	2.	N	28-2,5-1,5	NC15FE11M	NCF 600	NA 13	NiCr15Fe	868
Inconel 601	2.	N	XH60BT	NC23FeA	NCF 601	NA 49	NiCr23Fe	868
Inconel 617	2.	N
Inconel 625	2.	N	75	NC22DNB4M	NCF 625	NA 21	NiCr22Mo9Nb	602
Inconel 690	2.	N
Inconel 718	2.	N
Inconel 725	-	N
Inconel X-750	2.	N

Inconel Melting Point, Density and Tensile Strength

Density	Melting Point	Tensile Strength	Yield Strength (0.2% Offset)	Elongation
600	8.47 g/cm3	°C (°F)	Psi 95,000, MPa 655	Psi 45,000, MPa 310	40%
601	8.1 g/cm3	°C (°F)	Psi 80,000, MPa 550	Psi 30,000, MPa 205	30%
617	8.3 g/cm3	°C	MPa 485	MPa 275	25%
625	8.4 g/cm3	°C (°F)	Psi 135,000, MPa 930	Psi 75,000, MPa 517	42.5%
690	8.3 g/cm3	°C	MPa 485	MPa 275	25%
718	8.2 g/cm3	°C (°F)	Psi 135,000, MPa 930	Psi 70,000, MPa 482	45%
725	8.31 g/cm3	°C-°C	MPa 827	20%
X-750	8.28 g/cm3	°C	MPa 868	25%

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