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Difference Between Inconel and Incoloy

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Defintion

Inconel alloys are ideal for extreme pressure and temperature applications. They’re right for situations where steel and aluminum may fail because of thermal creep. When heated, Inconel alloys form a thick yet stable oxide layer, which protects surfaces from increased attack. When alloyed with other materials, you can strengthen and stiffen the alloy to permit its use in the most demanding areas.


Incoloy alloys have higher ferrous content and lower costs than Inconel. Standard Incoloy alloys work well in elevated temperatures in less demanding applications. They’re also easier to fabricate than Inconel alloys. You can use the same machining and processing technique as you do with stainless steel. Incoloy comes in various grades, with an emphasis on providing higher corrosion resistance in a variety of applications.


Incoloy Compositions (Percentages)

Alloy Name

Balance
Metal

Chro
Mium

Alu
Minum

Tita
Nium

Carbon

Yttrium Oxide

Copper

Man
Ganese

Cobalt

Nickel

Phos
Phorus

Silicon

Sulphur

Moly
Bdenum

Nb
+Ti

020

Fe (~40%)

20

N/P

N/P

<0.07

N/P

3.5

<2.0

N/P

35

<0.045

<1.0

<0.035

2.5

About 1

DS

Fe (~40%)

18

N/P

0.2

0.1

Nil

0.5

0.8-1.5

18 (Co+
Ni
38)

18 (Co+
Ni
38)

N/P

2.3

0.03



MA956

Fe (~75%)

20

4.75

0.4

<0.1

0.5

<0.15

<0.3

<0.3

<0.5

<0.02

N/P

N/P



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




Applications, where Inconel and Incoloy alloys are used, are as follows:

 Inconel:

(1)Chemical and petrochemical processing

(2)Flare stacks on offshore oil platforms

(3)Gas turbines, rocket motors/engines, and spacecraft

(4)Pollution control equipment

(5)Nuclear reactors

 Incoloy:

(1)carburizing equipment, heating-element sheathing, process piping, heat exchangers, nuclear steam-generator tubing,

(2)heat-treating equipment, chemical and petrochemical processing, power plants, industrial furnaces,

(3)oil, and gas well piping, nuclear fuel reprocessing, acid production, pickling equipment.





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