Nickel Alloy 907/ Incoloy 907®

Technical Data Sheet

Chemical Composition Limits









Alloy 907






0.2 max


Alloy 907 (Incoloy alloy 907) is a nickel-iron-cobalt alloy with additions of niobium and titanium for precipitation hardening. It has the low coefficient of expansion and high strength of alloy 903 but alloy 907 has improved notch-rupture properties at elevated temperatures. Alloy 907 is used for gas turbines components (seals, shafts, casings and other structural parts).

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Super Alloy Incoloy 907(tm)


  • UNS N19907


Chemistry Data : [top]



0.2 max



0.012 min



0.06 max



1 max



12 - 16



0.5 max






1 max



35 - 40



4.3 - 5.2



0.015 max



0.35 max



0.015 max



1.2 - 1.8




Principal Design Features


A nickel-cobalt-iron alloy with niobium (columbium). It is age-hardenable and has high strength along with a low coefficient of thermal expansion at temperatures up to 800 F.





Glass to metal sealing, gas turbine seals, casings and other hot section structural parts.





Conventional machining techniques used for iron based alloys may be used. This alloy does work-harden during machining and has higher strength and "gumminess" not typical of steels. Heavy duty machining equipment and tooling should be used to minimize chatter or work-hardening of the alloy ahead of the cutting. Most any commercial coolant may be used in the machining operations. Water-base coolants are preferred for high speed operations such as turning, grinding, or milling. Heavy lubricants work best for drilling, tapping, broaching or boring. Turning: Carbide tools are recommended for turning with a continuous cut. High-speed steel tooling should be used for interrupted cuts and for smooth finishing to close tolerance. Tools should have a positive rake angle. Cutting speeds and feeds are in the following ranges: For High-Speed Steel Tools For Carbide Tooling Depth Surface Feed Depth Surface Feed of cut speed in inches of cut speed in inches inches feet/min. per rev. inches feet/min. per rev. 0.250" 25-35 0.030 0.250" 150-200 0.020 0.050" 50-60 0.010 0.050" 325-375 0.008 Drilling: Steady feed rates must be used to avoid work hardening due to dwelling of the drill on the metal. Rigid set-ups are essential with as short a stub drill as feasible. Heavy-duty, high-speed steel drills with a heavy web are recommended. Feeds vary from 0.0007 inch per rev. for holes of less than 1/16" diameter, 0.003 inch per rev. for 1/4" dia., to 0.010 inch per rev. for holes of 7/8"diameter. Milling: To obtain good accuracy and a smooth finish it is essential to have rigid machines and fixtures and sharp cutting tools. High-speed steel cutters such as M-2 or M-10 work best with cutting speeds of 30-40 feet per minute and feed of 0.004"-0.006" per cutting tooth. Grinding: The alloy should be wet ground and aluminum oxide wheels or belts are preferred.





This alloy has good ductility and may be readily formed by all conventional methods. Because the alloy is stronger than regular steel it requires more powerful equipment to accomplish forming. Heavy-duty lubricants should be used during cold forming. It is essential to thoroughly clean the part of all traces of lubricant after forming as embrittlement of the alloy may occur at high temperatures if lubricant is left on.





The commonly used welding methods work well with this alloy. Matching alloy filler metal should be used. If matching alloy is not available then the nearest alloy richer in the essential chemistry (Ni, Co, Cr, Mo) should be used. All weld beads should be slightly convex. It is not necessary to use preheating. Surfaces to be welded must be clean and free from oil, paint or crayon marking. The cleaned area should extend at least 2" beyond either side of a welded joint. Gas-Tungsten Arc Welding: DC straight polarity (electrode negative) is recommended. Keep as short an arc length as possible and use care to keep the hot end of filler metal always within the protective atmosphere. Shielded Metal-Arc Welding: Electrodes should be kept in dry storage and if moisture has been picked up the electrodes should be baked at 600 F for one hour to insure dryness. Current settings vary from 60 amps for thin material (0.062" thick) up to 140 amps for material of 1/2" and thicker. It is best to weave the electrode slightly as this alloy weld metal does not tend to spread. Cleaning of slag is done with a wire brush (hand or powered). Complete removal of all slag is very important before successive weld passes and also after final welding. Gas Metal-Arc Welding: Reverse-polarity DC should be used and best results are obtained with the welding gun at 90 degrees to the joint. For Short-Circuiting-Transfer GMAW a typical voltage is 20- 23 with a current of 110-130 amps and a wire feed of 250-275 inches per minute. For Spray-Transfer GMAW voltage of 26 to 33 and current in the range of 175-300 amps with wire feed rate of 200-350 inches per minute are typical. Submerged-Arc Welding: Matching filler metal, the same as for GMAW, should be used. DC current with either reverse or straight polarity may be used. Convex weld beads are preferred.



Heat Treatment


Solution anneal at 1800 F and air cool. Age-hardening may then be done by either of 2 thermal treatments -- see "Aging".





The alloy behaves in similar fashion to Inconel 718. Forging is done in the range of 2100 F to 1700 F.



Hot Working


Hot working may be done in the range of 2100 F to 1650 F. Care should be taken to ensure that at least a 20% final reduction is made at a temperature under 1800 F to obtain optimum properties.



Cold Working


Cold forming may be done using standard tooling although plain carbon tool steels are not recommended for forming as they tend to produce galling. Soft die materials (bronze, zinc alloys, etc.) minimize galling and produce good finishes, but die life is somewhat short. For long production runs the alloy tool steels ( D-2, D-3) and high-speed steels (T-1, M-2, M-10) give good results especially if hard chromium plated to reduce galling. Tooling should be such as to allow for liberal clearances and radii. Heavy duty lubricants should be used to minimize galling in all forming operations. Bending of sheet or plate through 180 degrees is generally limited to a bend radius of 1 T for material up to 1/8" thick and 2 T for material thicker than 1/8".





Anneal at 1800 F and air cool.





After solution annealing either of 2 aging treatments may be used. For max. tensile properties: 1325 F for 8 hours, furnace cool at 100 F per hour to 1150 F then air cool. For max. hot rupture strength: 1425 F for 12 hours, furnace cool at 100 F per hour to 1150 F and air cool.



Physical Data : [top]


Density (lb / cu. in.)


Specific Gravity


Specific Heat (Btu/lb/Deg F - [32-212 Deg F])


Electrical Resistivity (microhm-cm (at 68 Deg F))


Melting Point (Deg F)


Poissons Ratio


Thermal Conductivity


Mean Coeff Thermal Expansion


Modulus of Elasticity Tension


Reduction of Area




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INCOLOY 907 Plate

INCOLOY 907 Fittings

INCOLOY 907 Tube / Pipe







INCOLOY 907 Sheet

INCOLOY 907 Coil /Strap






INCOLOY 907 Fasteners / Flanges

INCOLOY 907 Powder

INCOLOY 907 Welding Product



UNS N19907

Incoloy Alloy 907 (tradename)

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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