Inconel vs Hastelloy

What precisely is Inconel?

Inconel is a corrosion-resistant, oxidation-resistant alloy that performs well in high-temperature, high-pressure conditions. When Inconel alloy is heated, it develops a thick, stable oxide coating on the surface, which protects it from further attack. Inconel’s strength extends over a wide temperature range. Depending on the alloy, it achieves high temperature strength through solid solution strengthening or precipitation hardening. Inconel is a high-temperature metal widely used in a wide range of applications.

Chemical Composition of Inconel

Inconel Grade

Carbon

Manganese

Sulfur

Phosphorus

Chromium

Silicon

Molybdenum

Niobium

Cobalt

Copper

Aluminum

Titanium

Nickel

Iron

Boron

Inconel 600

0.15

1.00

0.015

–

14.0–17.0

0.50

–

–

–

0.50

–

–

72.0max

6.0–10.0

–

Inconel 617

0.15

0.50

0.015

0.015

20.0–24.0

0.50

8.0–10.0

–

10.0–15.0

0.50

0.8–1.50

0.60

44.2–56.0

3.00max

0.006

Inconel 625

0.10

0.50

0.015

0.015

20.0–23.0

0.50

8.0–10.0

3.15–4.15

1.00

–

0.40

0.40

58.0max

5.00max

–

Inconel 690

0.019

0.35

0.003

–

30.0max

0.35

–

–

–

0.01

0.02

–

59.5max

9.20max

–

Inconel 718

0.08

0.35

0.015

0.015

17.0–21.0

0.35

2.8–3.3

4.75–5.5

1.00

0.2–0.8

0.65–1.15

0.30

50.0–55.0

balance

0.006

Inconel X-750

0.08

1.00

0.01

–

14.0–17.0

0.50

–

0.7–1.2

1.00

0.50

0.4–1.0

2.25–2.75

70.0max

5.0–9.0

–

Mechanical Properties of Inconel

Inconel Grade	Tensile Strength	Yield Strength (0.2%Offset)	Density	Melting Point	Elongation
Inconel 600	Psi – 95,000 , MPa – 655	Psi – 45,000 , MPa – 310	8.47 g/cm3	1413 °C (2580 °F)	0.4
Inconel 601	Psi – 80,000 , MPa – 550	Psi – 30,000 , MPa – 205	8.1 g/cm3	1411 °C (2571 °F)	0.3
Inconel 617	≥ 485 MPa	≥ 275 MPa	8.3g/cm³	1363°C	0.25
Inconel 625	Psi – 135,000 , MPa – 930	Psi – 75,000 , MPa – 517	8.4 g/cm3	1350 °C (2460 °F)	0.425
Inconel 690	≥ 485 MPa	≥ 275 MPa	8.3g/cm³	1363°C	0.25
Inconel 718	Psi – 135,000 , MPa – 930	Psi – 70,000 , MPa – 482	8.2 g/cm3	1350 °C (2460 °F)	0.45
Inconel 725	1137 MPa	827 MPa	8.31 g/cm3	1271°C-1343 °C	0.2
Inconel X-750	1267 MPa	868 MPa	8.28 g/cm3	1430°C	0.25

Equivalent Grade of Inconel

Standard	WNR	UNS	AFNOR	JIS	BS	EN
Inconel 600	2.4816	N06600	NC15FE11M	NCF 600	NA 13	NiCr15Fe
Inconel 601	2.4851	N06601	NC23FeA	NCF 601	NA 49	NiCr23Fe
Inconel 617	2.4663	N06617
Inconel 625	2.4856	N06625	NC22DNB4M	NCF 625	NA 21	NiCr22Mo9Nb
Inconel 690	2.4642	N06690
Inconel 718	2.4668	N07718
Inconel 725	–	N07725
Inconel X-750	2.4669	N07750

What precisely is Hastelloy?

Hastelloy is a nickel-molybdenum alloy with a high melting point. It is available in a variety of grades, the bulk of which are nickel chromium molybdenum alloys. Regardless of the use for which each Hastelloy grade was developed, they are all exceedingly corrosion resistant. Hastelloy becomes stronger and tougher at elevated temperatures when alloyed with, making it ideal for welding applications. It’s simple to shape and assemble. Due to its ductility, they can be forged and cold wrought. Due to its exceptional resistance to highly oxidizing and reducing chemicals, Hastelloy is an excellent choice for high-temperature applications. It is extensively used for pipes and valves in the chemical and petrochemical industries. It is a wonderful material for heat exchangers and pressure vessels, as well as nuclear and chemical reactors.

Chemical Makeup Hastelloy

Alloy

Carbon

Cobalt

Chromium

Molybdenum

Vanadium

Tungsten

Aluminium

Copper

Niobium

Titanium

Iron

Nitrogen

Other%

B

0.10max

1.25max

0.60max

28.00max

0.30max

–

–

–

–

–

5.50max

Bal

Mn 0.80; Si 0.70

B2

0.02max

1.00max

1.00max

26.0-30.0

–

–

–

–

–

–

2.00max

Bal

Mn 1.0, Si 0.10

C

0.07max

1.25max

16.00max

17.00max

0.30max

40.0max

–

–

–

–

5.75max

Bal

Mn 1.0; Si 0.70

C4

0.015max

2.00max

14.0-18.0

14.0-17.0

–

–

–

–

–

0.70max

3.00max

Bal

Mn 1.0 ; Si 0.08

C276

0.02max

2.50max

14.0-16.5

15.0-17.0

0.35max

3.0-4.5

–

–

–

–

4.0-7.0

Bal

Mn 1.0; Si 0.05

G

0.05max

2.50max

21.0-23.5

5.5-7.5

–

1.00max

–

1.5-2.5

1.7-2.5

–

18.0-21.0

Bal

Mn 1.0-2.0; P0.04; Si 1.0;

N

0.06max

0.25max

7.00max

16.50max

–

0.20max

–

0.10max

–

–

3.00max

Bal

Mn 0.40; Si 0.25; B 0.01

S

0.02max

2.00max

15.50max

14.50max

0.60max

1.00max

0.20max

–

–

–

3.00max

Bal

Mn 0.50; Si 0.40; B0.0009; La 0.02

W

0.06max

1.25max

5.00max

24.50max

–

–

–

–

–

–

5.50max

Bal

Mn 0.050; Si 0.50

X

0.10max

1.50max

22.0max

9.00max

–

0.60max

–

–

–

18.50max

–

Bal

Mn 0.6; Si 0.60

Mechanical Properties of Hastelloy

Alloy	Tensile Strength	Yield Strength (0.2%Offset)	Density	Melting Point	Elongation
Alloy C22	Psi – 1,00,000 , MPa – 690	Psi – 45000 , MPa – 310	8.69 g/cm3	1399 °C (2550 °F)	0.45
Alloy C276	Psi – 1,15,000 , MPa – 790	Psi – 52,000 , MPa – 355	8.89 g/cm33	1370 °C (2500 °F)	0.4
Alloy B2	Psi – 1,15,000 , MPa –760	Psi – 52,000 , MPa – 350	9.2 g/cm3	1370 °C (2550 °F)	0.4
Alloy B3	Psi – 1,15,000 , MPa –760	Psi – 52,000 , MPa – 350	9.2 g/cm3	1370 °C (2550 °F)	0.4
Alloy C4	783	365	8.64 g/cm3	1350-1400 °C	0.55
Alloy X	655 MPa	240 MPa	8.22 g/cm³	1355°C	0.35

Equivalent Grade of Hastelloy 

Alloy	WNR	UNS	GOST	JIS	EN
C22	2.4602	N06022	–	NW 6022	NiCr21Mo14W
C276	2.4819	N10276	ХН65МВУ	NW 0276	NiMo16Cr15W
B2	2.4617	N10665	–	–	–
B3	2.46	N10675	–	–	–
C4	2.461	N06455	–	–	–
C-22	–	N07022	–	–	–
C2000	2.4675	N06200	–	–	–
X	2.4665	N06002	–	–	–

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