UNS N07751

HuaNickel UNS N07751 is a precipitation-hardenable nickel-chromium alloy that is mainly used in the exhaust valves of internal combustion engines. The alloy has the same physical, mechanical, and corrosion resistance as conel-iron X-750. This alloy has excellent high-temperature strength and corrosion resistance, so it has a wide range of applications in aerospace, petrochemical, nuclear industry, heat treatment and boiler manufacturing.

UNS N07751Chemical composition：

	Ni	Cr	Fe	Ti	AI	Nb	Mn	Si	S	Cu	C
Min	70.0	14.0	5.0	2.0	0.9	0.7	≤
Max		17.0	9.0	2.6	1.5	1.2	1.0	0.5	0.01	0.5	0.10

UNS N07751Physical properties：

Specific heat(J/kg･K)		431
Resistivity(μΩ･cm)		1.22
Thermal conductivity(W/m･K)		12.0
Coefficient of thermal expansion(10-6/℃)	（21-93°C）	12.6
Density（g/cm3）		8.22
Curie Point(℃)		-125
Melting point(℃)		1390-1430

UNS N07751Mechanical properties：

Temperature		Yield strength (0.2% offset)		Tensile strength		elongation	Section shrinkage	hardness
F	℃	ksi	MPa	ksi	MPa	%	%	BHN
indoors	indoors	141.5	976	190.0	1310	22.5	38.2	352
1200	649	128.9	889	159.6	1100	22.5	32.1	291
1350	732	113.5	783	124.8	860	18.5	25.7	235
1500	816	76.3	526	80.3	554	26.0	35.9	173

UNS N07751Alloy properties：

Corrosion Resistance:HuaNickel UNS N07751 alloy exhibits excellent resistance to uniform corrosion, pitting, crevice, intergranular and stress corrosion in a variety of environments. This is due to the fact that a variety of alloying elements are solidified into the nickel matrix, which significantly improves its corrosion resistance.

Oxidation resistance: This alloy has good oxidation resistance and is able to resist oxidation.

High Temperature Resistance:HuaNickel UNS N07751 alloy has excellent high temperature resistance, and this alloy is able to maintain good strength and toughness in high temperature environments.

UNS N07751Uses of alloys：

It is widely used in aerospace, petrochemical, nuclear industry, heat treatment and boiler manufacturing and other fields.

UNS N07751Process performance：

Welding process: HuaNickel UNS N07751 can be joined by flash fusion welding process commonly used in valve manufacturing. The alloy can also be welded by inertia.

Heat treatment: Heat treatment is found to produce materials with the best combination of properties consistent with economy. More sophisticated burn-in treatments can be used to improve the specific properties required for specific applications

Manufacturing Process:

Hot working: Ferroalloy 751 has a thermal working range of 18002200 °F (9801205 °C). When the alloy temperature is below 1800°F (980°C), the alloy should be reheated to 2200°F (1205°C).

Machining: UNS N07751 is easy to machine under hot working conditions. The best procedure is that the machine is slightly oversized, precipitated for heat treatment, and then finished to size. During precipitation, a slight permanent contraction (about 0.0003 in/in) occurs. Precipitation-treated materials can be surface machined to fine surface treatment and tight tolerances, and have good dimensional stability.

Relevant standards：

Alloy 751、W.Nr.2.4694、UNS N07751