Inconel 751 (UNS N07751)

Inconel 751 (UNS N07751) is a precipitation hardenable nickel-chromium alloy, used mainly for the exhaust valves of internal combustion engines. Its thermal properties correspond closely to those published for INCONEL alloy X-750.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Inconel 751	–	–	Inconel 751	N07751	–	–	–	–	–	–

Chemical Composition, %

Alloy

Ni+Co

Nb+Ta

Inconel 751

≤0.10

≤0.50

≤1.0

≤0.02

≤0.01

14.0-17.0

≥70

0.7-1.2

0.9-1.5

2.0-2.6

≤0.50

5.0-9.0

Typical Physical and Mechanical Properties (RT, Solution annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
8.22	1390-1430	1310	965	22	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	–
Plate, Sheet and Strip	–
Pipe and Tube	–
Welding Product	–
Others	–

Features

The alloy has essentially the same excellent physical, mechanical and corrosion-resistance properties as INCONEL alloy X-750.

Applications

In the evaluation of materials for exhaust valve applications, nickel-chromium alloys have performed well in a 1675°F (913°C) lead oxide screening test. INCONEL alloy 751 repeatedly offered good results, with corrosion rates averaging 4.31 g/dm2/h. Like other nickel-chromium alloys, INCONEL alloy 751 also resists attack by other exhaust stream impurities such as sulfur, bromine and chlorine.