Is Inconel® 625 the same as Nickel 625?

The chemical properties, mechanical properties and applications are within the same quality standards, so both materials are the same. Inconel® however, is a trademark that can only be used by one manufacturer namely Special Metals Corporation.

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There is still some confusion among buyers, engineers and processors when it comes to superalloys. Why does it say Inconel® 600 on the report and the factory test reports call it Nickel 600 or ATI® 600? Can one be substituted for the other?

The answer to this is a resounding yes. ASTM and AMS specifications guide the manufacture of these high-performance alloys. Reputable factories absolutely ensure that the material they produce meets these stringent standards. What is important in the name is not what comes before the alloy number, but the alloy number itself.

Why the Names?

Most of the high temp alloys were formulated after to support the high demands of aerospace engines. Jets needed to become more powerful, reliable, and durable. This required machined metal parts that surpassed the current technology.

The nickel superalloys were developed to stand up to high pressure, highly corrosive, and high kinetic energy uses. The mills that developed these alloys trademarked them when granted their patents. Those trademarked names are still commonly used today, even though the patents have long expired.

Summary

Most distributors, use generic names such as "Nickel 400" instead of "Monel® 400," or "Alloy C-276" instead of "Hastelloy® C-276." This is done because the patents on these high-quality nickel alloys have expired.

What's really important is that the materials in the supply chain, used for products that have a huge impact on our lives, are made to the highest quality standards. And that they are tested and certified to internationally recognized specifications.

Difference Between Nickel and Inconel

Nickel Vs Inconel

Nickel

Nickel 200 & Nickel 201 are commercially pure Nickel alloy with 99% minimum Nickel content. Alloy 200 is designated as UNS N and Werkstoff Number 2.. It is used for the manufacture of processing equipment. Nickel Alloy 200 is particularly suitable to maintain product purity in handling foods, synthetic fibres and alkalies. Nickel 200 is normally limited to service at temperatures below 600° F. At higher temperatures Alloy 200 can suffer from graphitization which can result in severely compromised properties. Alloy 200 can be easily welded by conventional welding, brazing, and soldering processes with the exception of the oxyacetylene process.

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 N 15.5 8 76 N 21.5 9 61 3.6 N 21 46 32.5 N 0.5 19 18.5 3 52.5 5.1 N 1.5 19.5 16.5 60 2.5

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

N

Annealed

Additional reading:
How to Maximize Benefits of Crngo?

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550-690

210-430

55-35

120-170

38

N

Annealed

930

520

45

180

160

N

Annealed

520-690

210-410

60-30

120-184

70 (700°C)

N

Age Hardened

17

382

170

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) referring to a family of austenitic nickel-chromium super alloys. Inconel® is a material that is specifically optimized for some of the toughest use conditions to be found in manufacturing while Titanium is a chemical element with symbol Ti and atomic number 22. It is a lustrous transition metal with a silver color, low density, and high strength.

Inconel Material Specification

• Inconel 600
  Solid solution strengthened.
• Inconel 601
• Inconel 625
  Acid resistant, good weldability. The LCF version is typically used in bellows. Ideal for hardware and components in the power, aerospace and chemical processing industries. Offered in sheet, plate, bar and forgings.
• Inconel 718
  Gamma double prime strengthened with good weldability. The preferred material for cryogenic storage tanks, turbines, downhole shafts and wellhead parts offered 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 aluminium content for improved rupture strength in the °F range.
• Inconel 792
  Increased aluminium content for improved high temperature corrosion properties, used especially in gas turbines.
• Inconel 939
  Gamma prime strengthened to increase weldability.
• Inconel 188
  Readily fabricated for commercial gas turbine and aerospace applications. Offered 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
  Inconel 230 Plate & Sheet mainly used by the power, aerospace, chemical processing and industrial heating industries, Aerospace Materials.

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, good weldability. The LCF version is typically used in bellows.
• 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 aluminium content for improved rupture strength in the °F range
• Inconel 792: Increased aluminium content for improved high temperature corrosion properties, used especially in gas turbines
• Inconel 939: Gamma prime strengthened to increase 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 8.3g/cm³ °C &#; 485 MPa &#; 275 MPa 25 % 625 8.4 g/cm3 °C ( °F) Psi &#; 135,000 , MPa &#; 930 Psi &#; 75,000 , MPa &#; 517 42.5 % 690 8.3g/cm³ °C &#; 485 MPa &#; 275 MPa 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 MPa 20 % X-750 8.28 g/cm3 °C MPa 868 MPa 25 %

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