Difference Between Inconel and Incoloy

Inconel

Inconel is a family of austenitic nickel-chromium-based superalloys.

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 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

Incoloy

Incoloy refers to a range of superalloys produced by the Special Metals Corporation group of companies.

Incoloy Compositions (percentages)

Alloy name	Balance metal	Chromium	Aluminum	Titanium	Carbon	Yttrium oxide	Copper	Manganese	Cobalt	Nickel	Phosphorus	Silicon	Sulphur	Molybdenum	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