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INCONEL Alloy 751 N07751 For Exhaust Valves Of Internal Combustion Engines

Place of Origin China
Brand Name XUNSHI
Certification ISO
Model Number N07751
Minimum Order Quantity 200kg
Price Negotiable
Packaging Details Plywood case
Delivery Time 45-60 days
Payment Terms T/T
Supply Ability 2000kg per week

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Product Details
UNS UNS N07751 Density, Lb/in3 0.297
Density, G/cm3 8.22 Curie Temperature, °F -193
Curie Temperature, °C -125 Melting Range, °F 2540-2600
Melting Range, °C 1390-1430 Available Forms Round Bar, Forging, Seamless Pipe
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INCONEL Alloy 751


UNS N07751 INCONEL Alloy

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Product Description

INCONEL alloy 751 (UNS N07751) is a precipitation hardenable nickel-chromium alloy, used mainly for the exhaust valves of internal combustion engines. The alloy has essentially the same excellent physical, mechanical and corrosion-resistance properties as INCONEL alloy X-750. Its thermal
properties correspond closely to those published for INCONEL alloy X-750.


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.


Chemical composition

Element Nickel (+ Cobalt) Chromium Iron Titanium Aluminum Niobium (+ Tantalum) Manganese Silicon Sulfur Copper Carbon
Weight(%) 70 min 14.0-17.0 5.0-9.0 2.0-2.6 0.9-1.5 0.7-1.2 1.0 max 0.5 max 0.01 max 0.5 max 0.10 max



INCONEL alloy 751 has excellent hot hardness. As a result, hard facing of valve seat areas for good wear-resistance is unnecessary in most applications.


Tensile Properties


Yield Strength

(0.2% Offset)

Tensile Strength Elongation Reduction of Area Hardness
°F °C ksi MPa ksi MPa % % HBN
Room Room 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


Hot working

The hot working range for INCONEL alloy 751 is 1800-2200°F (980-1205°C). The alloy should be reheated to 2200°F (1205°C) whenever its temperature falls below 1800°F (980°C).


INCONEL alloy 751 is readily machined in the as-hot finished condition. The best procedure is to machine to slightly oversize, precipitation heat treat, then finish to size. A slight permanent contraction (about 0.0003 in/in) takes place during precipitation. Precipitation treated material can
be finish machined to fine finishes and close tolerances, and will have good dimensional stability.


INCONEL alloy 751 can be joined by the flash butt welding procedures commonly used in valve manufacture. The alloy can also be inertia welded.


Heat treatment

All properties listed in this publication were derived from material direct aged for two hours at 1350°F (732°C). This short-time heat treatment has been found to produce material with the optimum combination of properties consistent with economy. Longer, more complex, aging treatments may be used to improve specific properties required for particular applications. Please consult Special Metals Corporation for further information.

Available forms at A-ONE ALLOY

Round bar, forging, seamless pipe

INCONEL Alloy 751 N07751 For Exhaust Valves Of Internal Combustion Engines 0INCONEL Alloy 751 N07751 For Exhaust Valves Of Internal Combustion Engines 1INCONEL Alloy 751 N07751 For Exhaust Valves Of Internal Combustion Engines 2