Inconel vs Hastelloy

Inconel, what is it exactly?

Inconel is a corrosion- and oxidation-resistant alloy that performs exceptionally well in high-temperature, high-pressure environments. When Inconel alloy is heated, it forms a thick, stable oxide coating on the surface, protecting it from further attack. Inconel’s strength is maintained over a wide temperature range. It achieves high temperature strength through solid solution strengthening or precipitation hardening, depending on the alloy.. Inconel is a high-temperature metal that is widely used in a wide range of applications.

Chemical Formula 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

Inconel Equivalent Grade

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

Hastelloy, what is it exactly?

Hastelloy is a high-melting-point nickel-molybdenum alloy. It is available in a variety of grades, the majority of which are nickel chromium molybdenum alloys. Regardless of the application for which it was designed, each Hastelloy grade is extremely corrosion resistant. Hastelloy becomes stronger and tougher at higher temperatures when alloyed with, making it ideal for welding applications. It’s simple to shape and assemble. Because of their ductility, they can be forged and cold worked. Because of its outstanding resistance to strongly oxidising and reducing substances, Hastelloy is an excellent choice for high-temperature applications. It is widely used for pipes and valves in the chemical and petrochemical industries. It’s an excellent material for heat exchangers, pressure vessels, nuclear and chemical reactors, and other applications.

Hastelloy Chemical Makeup

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

Hastelloy’s Mechanical Characteristics

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

Hastelloy’s Equivalent Grade

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	–	–	–

Read More :

What is the difference between Hastelloy and Monel? : Monel is largely made of nickel and copper (52-67 percent), with minor amounts of silicon, manganese, iron, and carbon. Hastelloy is one of the most corrosion-resistant nickel-based steel alloys available. Hastelloy, as compared to standard alloys, has a unique mix of features that make them substantially more corrosion resistant, Read more

Comparison of Monel and Nickel Valves : There are three variables to consider when evaluating the quality of a valve section. The first is the general construction quality. Poor construction, regardless of the material, will ruin any valve. The pistons’ surface condition is the second factor to consider, Read More.