Difference Between Inconel and Nimonic

Inconel

Inconel is a family of austenitic nickel-chromium-based superalloys while Nimonic alloys typically consist of more than 50% nickel and 20% chromium with additives such as titanium and aluminium. Nimonic & Inconel are registered trademark of Special Metals Corporation.

Inconel Composition

Inconel	Element (% by mass)
Inconel	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 1600 °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
600	2.4816	N06600	МНЖМц 28-2,5-1,5	NC15FE11M	NCF 600	NA 13	NiCr15Fe	ЭИ868
601	2.4851	N06601	XH60BT	NC23FeA	NCF 601	NA 49	NiCr23Fe	ЭИ868
617	2.4663	N06617
625	2.4856	N06625	ХН75МБТЮ	NC22DNB4M	NCF 625	NA 21	NiCr22Mo9Nb	ЭИ602
690	2.4642	N06690
718	2.4668	N07718
725	-	N07725
X-750	2.4669	N07750

Inconel Melting Point, Density and Tensile Strength

	Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
600	8.47 g/cm3	1413 °C (2580 °F)	Psi – 95,000 , MPa – 655	Psi – 45,000 , MPa – 310	40 %
601	8.1 g/cm3	1411 °C (2571 °F)	Psi – 80,000 , MPa – 550	Psi – 30,000 , MPa – 205	30 %
617	8.3g/cm³	1363°C	≥ 485 MPa	≥ 275 MPa	25 %
625	8.4 g/cm3	1350 °C (2460 °F)	Psi – 135,000 , MPa – 930	Psi – 75,000 , MPa – 517	42.5 %
690	8.3g/cm³	1363°C	≥ 485 MPa	≥ 275 MPa	25 %
718	8.2 g/cm3	1350 °C (2460 °F)	Psi – 135,000 , MPa – 930	Psi – 70,000 , MPa – 482	45 %
725	8.31 g/cm3	1271°C-1343 °C	1137 MPa	827 MPa	20 %
X-750	8.28 g/cm3	1430°C	1267 MPa	868 MPa	25 %

Nimonic

Nimonic grades:

Nimonic 75
Nimonic 81
Nimonic 86
Nimonic 80/80A
Nimonic 90
Nimonic 105
Nimonic 115
Nimonic 263
Nimonic 901

Nimonic Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS
Nimonic® 75	2.4951	N06075
Nimonic® 80	2.4952	N07080
Nimonic® 81
Nimonic® 86
Nimonic® 115	2.4636
Nimonic® 263	2.4650	N07263
Nimonic® 901	2.4662	N09901

Nimonic Chemical Composition

Grade

Nimonic® 75

Bal.

19-22

Max 1.0

Max 0.015

Max 0.2

Max 0.15

0.15-0.35

Max 0.12

Max 0.70

Max 0.80

Max 0.02

Nimonic® 81

≤30

≤1.0

0.9

1.8

≤2

Grade	Ni	Cr	Mo	Fe	Cu	Al	Ti	Zr	Mn	Si	Co	C	Sulfur, S	Boron, B
Nimonic® 105	51	14-15.7	4.50-5.50	1	0.20	4.50-4.90	0.90-1.50	0.15	1	1	18-22	0.12	0.010	0.0030-0.010

Grade

Nimonic 80

1 – 1.8

0.008 max

0.1 max

18 – 21

0.2 max

3 max

1 max

Balance

0.045 max

1 max

0.015 max

Grade	Ni	Co	Cr	Mo	Ti	Fe	Mn	Al	Si	Cu	C	B	S
Nimonic 263	49	19-21	19-21	5.60-6.10	1.90-2.40	0.70	0.60	0.60	0.40	0.20	0.040 – 0.080	0.0050	0.0070

Weight%

Nimonic Alloy 901

42.5

12.5

5.75

2.9

1.0 max

0.5 max

0.4 max

0.35 max

0.1 max

0.03 max

Bal

Weight %

Alloy 90

Bal

18-21

15-21

2-3

1-2

0.2 max

1.0 max

0.2 max

1.5 max

1.0 max

0.02 max

0.015 max

0.15 max

0.0020 max

Nimonic Melting Point, Density and Tensile Strength

Grade	Density	Melting Point
75	8.4 g/cm3	1374°C-1420 °C
80	0.295	2450 °F
81	8.06 gm/cm3	1357°C
86	8.54 g/cm³	1327°C
105	8.01 g/cm³	1327°C
115	7.85 g/cm³	1304°C
263	0.302 lb/in³	2372-2471°F