Item # 718-BAR-2, Inconel® Alloy 718 On High Performance Alloys, Inc.


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	Item # 718-BAR-2, Inconel® Alloy 718

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Inconel® Alloy 718 (UNS N07718) Ni 52.5, Cr 19.0 Fe 18.5 Mo 3.0 Nb+Ta 3.6
Excellent strength from -423 °F to 1300 °F (-253 °C to 705 °C). Age hardenable and may be welded in fully aged condition, excellent oxidation resistance up to 1800 °F (980 °C).
Jet engines, pump bodies and parts, rocket motors and thrust reversers, nuclear fuel element spacers, hot extrusion tooling.

Gamma Prime strengthened alloy with excellent mechanical properties at elevated temperatures, as well as cryogenic temperatures. Suitable for temperatures up to around 1300 °F. Can be readily worked and age hardened.

Excellent strength from -423 °F to 1300 °F (-253 °C to 705 °C). Age hardenable and may be welded in fully aged condition, Excellent oxidation resistance up to 1800 °F (980 °C). Typically sold in the solution annealed temper, but can be ordered aged, cold worked, or cold worked & aged.

Specifications · Physical · Mechanical · Nominal Chemistry · General Resistance · Machinability Ratings · Machining Section · Applications

Specifications

Type		Bar

Size		2.000

Alloy		718

Physical

Density		0.296 lb/in³

Specific Heat		0.104 Btu/lb ºF

Electrical Resistivity		Aged: 725 ohm/cir-mil-ft Annealed: 753 ohm/cir-mil-ft

Curie Temperature		Aged: -170 ºF Annealed: <-320 ºF

Melting Range		2300 - 2437 ºF

Thermal Expansion (x 10^-6 in/in/Deg F)		7.1 (70 - 200 F)

Mechanical

Mechanical Type		Aged Annealed

Tensile Strength		Aged: 180 ksi Annealed: 125000 psi

Yield Strength		Aged: 150 ksi Annealed: 60000 psi

Elongation		Aged: 12% Annealed: 51%

Hardness		Annealed: Rc 36 Annealed: Equivalent Aged: C36

Nominal Chemistry

Ni		52.5 min.

Fe		bal.

Cr		19

Co		1 max

Mo		3

Cu		0.30 max

Al		0.5

Mn		0.35 max

Si		0.35 max

Ti		0.9

C		0.05

Other		5 Cb + Ta

General Resistance

General Resistance		Corrosion Temperature / Oxidation

UNS		N07718

Werkstof		2.4668

Sheet/Plate USA		Aged: AMS 5596 Aged: B670 Annealed: AMS 5596 Annealed: B670

Bar/Rod USA		Aged: B637 Aged: AMS 5663 Aged: AMS 5664 Annealed: AMS 5662 Annealed: B637

Forging USA		Aged: B637 Aged: AMS 5663 Aged: AMS 5664 Aged: AMS 5832 Annealed: B637 Annealed: AMS 5662

Weld Wire		A5.14 ERNiFeCr-2

Machinability Ratings

Speed Surface		Aged: 40 ft/mm Annealed: 20 ft/mm

Speed % of B1112		Aged: 24 Annealed: 12

Note		These machinability ratios must be recognized as approximate values. They are a reasonable guide to relative tool life and lower required for cutting. It is obvious, however, that variables of speed, cutting oil, feed and depth of cut will significantly affect these ratios.

Machining Section

The alloys described here work harden rapidly during machining and require more power to cut than do the plain carbon steels. The metal is ‘gummy,’ with chips that tend to be stringy and tough. Machine tools should be rigid and used to no more than 75% of their rated capacity. Both work piece and tool should be held rigidly; tool overhang should be minimized. Rigidity is particularly important when machining titanium, as titanium has a much lower modulus of elasticity than either steel or nickel alloys. Slender work pieces of titanium tend to deflect under tool pressures causing chatter, tool rubbing and tolerance problems.

Make sure that tools are always sharp. Change to sharpened tools at regular intervals rather than out of necessity. Titanium chips in particular tend to gall and weld to the tool cutting edges, speeding up tool wear and failure. Remember- cutting edges, particularly throw-away inserts, are expendable. Don't trade dollars in machine time for pennies in tool cost.

Feed rate should be high enough to ensure that the tool cutting edge is getting under the previous cut thus avoiding work-hardened zones. Slow speeds are generally required with heavy cuts. Sulfur chlorinated petroleum oil lubricants are suggested for all alloys but titanium. Such lubricants may be thinned with paraffin oil for finish cuts at higher speeds. The tool should not ride on the work piece as this will work harden the material and result in early tool dulling or breakage. Use an air jet directed on the tool when dry cutting, to significantly increase tool life.

Lubricants or cutting fluids for titanium should be carefully selected. Do not use fluids containing chlorine or other halogens (fluorine, bromine or iodine), in order to avoid risk of corrosion problems. The speeds are for single point turning operations using high speed steel tools. This information is provided as a guide to relative machinability, higher speeds are used with carbide tooling.

Applications

Uses for this alloy tend to be in the field of gas turbine components and cryogenic storage tanks. Jet engines, pump bodies and parts, rocket motors and thrust reversers, nuclear fuel element spacers, hot extrusion tooling. Other popular uses are high strength bolting, and down hole shafting.

Item # 718-BAR-2, Inconel® Alloy 718

Type

Size

Alloy

Density

Specific Heat

Electrical Resistivity

Curie Temperature

Melting Range

Thermal Expansion (x 10-6 in/in/Deg F)

Mechanical Type

Tensile Strength

Yield Strength

Elongation

Hardness

Ni

Fe

Cr

Co

Mo

Cu

Al

Mn

Si

Ti

C

Other

General Resistance

UNS

Werkstof

Sheet/Plate USA

Bar/Rod USA

Forging USA

Weld Wire

Speed Surface

Speed % of B1112

Note

Thermal Expansion (x 10^-6 in/in/Deg F)