High Performance
Nickel-Chromium-Molybdenum
Heat and Corrosion
Resistant Alloy

Alloy

718
Alloy 718
Product
Description 		Gamma Prime strengthened alloy with excellent mechanical properties at elevated temperatures, as well as cryogenic temperatures. Suitable for temperatures upto around 1300° F. Can be readily worked and age hardened.
Excellent strength from -423 degrees F to 1300 degrees F (-253 degrees C to 705 degrees C). Age hardenable and may be welded in fully aged condition, Excellent oxidation resistance up to 1800 degrees F (980 degrees C). Typically sold in the solution annealed temper, but can be ordered aged, cold worked, or cold worked & aged.

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 ing. Other popular uses are high strength bolting, and down hole shafting.

Chemistry
Chemical Requirements
Fe Mo Mn Si Cr C
Max 55.0 Bal 3.30 0.35 0.35 21.0 0.08
Min 50.0 2.80 17.0
Mechanical Property Requirements
Ultimate Tensile Yield Strength (0.2% OS) Elong. in 2 in. (50mm) or 4D min, %
Max 202.3 KSI 170.4 KSI 20.3
Min 185 KSI 150 KSI 12
High Performance Alloys can make hot rolled, cold worked, and strain hardened high performance stainless steel bars in-house now. Ask for our GFM Bulletin for more information about our bar processing capabilities. We have expanded to enhance product availability. HPA has a full line of high strength nickel based alloys.
Questions? Call (800)HPALLOY
Alloy 718
Specifications
Form Standard
Metal Type UNS N07718
Bar ASTM B637 AMS 5662 AMS 5663 AMS 5664 PWA 1009 PWA 1010 GE B50TF15
Wire AMS 5832
Sheet ASTM B670 AMS 5596 AMS 5597 PWA 1033 GE B50TF14 ASTM B670 ASTM B637
Plate ASTM B670 AMS 5596 AMS 5597 PWA 1033 GE B50TF15 ASTM B670 ASTM B637
Tube AMS 5589 AMS 5590
Pipe AMS 5589 AMS 5590
Fitting
Forging ASTM B637 AMS 5562 AMS 5663 AMS 5664 PWA 1009 PWA 1010 GE B50TF15
Weld Wire A5.14 ERNiFeCr-2
Weld Electrode
Din 2.4668
Machinability Ratings
when machining, however, it should be emphasized that these alloys can be machined using conventional production methods at satisfactory rates. During machining these alloys work harden rapidly, generate high heat during cutting, weld to the cutting surface and offer high resistance to metal removal because of their high shear strengths. The following are key points which should be considered during machining operations:
CAPACITY - Machine should be rigid and overpowered as much as possible.
RIGIDITY - Work piece and should be held rigid. Minimize overhang.
SHARPNESS - Make sure s are sharp at all times. Change to sharpened s at regular intervals rather than out of necessity. A 0.015 inch wear land is considered a dull .
S - Use positive rake angle s for most machining operations. Negative rake angle s can be considered for intermittent cuts and heavy stock removal. Carbide-tipped s are suggested for most applications. High speed s can be used, with lower production rates, and are often recommended for intermittent cuts.
POSITIVE CUTS - Use heavy, constant, feeds to maintain positive cutting action. If feed slows and the dwells in the cut, work hardening occurs, life deteriorates and close tolerances are impossible.
LUBRICATION - lubricants are desirable. Soluble oils are recommended especially when using carbide ing. Detailed machining parameters are presented Tables 16 and 17. General plasma cutting recommendations are presented in Table 18.
Alloy 718
Recommended Types and Machining Conditions
Operations Carbide s
Roughing, with severe interruption Turning or Facing C-2 and C-3 grade: Negative rake square insert, 45 degree SCEA1, 1/32 in. nose radius. holder: 5 degree neg. back rake, 5 degree neg. side rake. Speed: 30-50 sfm, 0.004-0.008 in. feed, 0.150 in depth of cut. Dry2, oil3, or water-base coolant4.
Normal roughing Turning or Facing C-2 or C-3 grade: Negative rate square insert, 45 degree SCEA, 1/32 in nose radius. holder: 5 degree neg. back rake, 5 degree neg. side rake. Speed: 90 sfm depending on rigidity of set up, 0.010 in. feed, 0.150 in. depth of cut. Dry, oil, or water-base coolant.
Finishing Turning or Facing C-2 or C-3 grade: Positive rake square insert, if possible, 45 degree SCEA, 1/32 in. nose radius. holder: 5 degree pos. back rake, 5 degree pos. side rake. Speed: 95-110 sfm, 0.005-0.007 in. feed, 0.040 in. depth of cut. Dry or water-base coolant.
Rough Boring C-2 or C-3 grade: If insert type boring bar, use standard positive rake s with largest possible SCEA and 1/16 in. nose radius. If brazed bar, grind 0 degree back rake, 10 degree pos. side rake, 1/32 in. nose radius and largest possible SCEA. Speed: 70 sfm depending on the rigidity of setup, 0.005-0.008 in. feed, 1/8 in. depth of cut. Dry, oil or water-base coolant.
Finish Boring C-2 or C-3 grade: Use standard positive rake s on insert type bars. Grind brazed s as for finish turning and facing except back rake may be best at 0 degrees. Speed: 95-110 sfm, 0.002-0.004 in feed. Water-base coolant.
Facing Milling Carbide not generally successful, C- grade may work. Use positive axial and radial rake, 45 degree corner angle, 10 degree relief angle. Speed: 50-60 sfm. Feed: 0.005-0.008 in. Oil or waterbase coolants will reduce thermal shock damage of carbide cutter teeth.
End Milling Not recommended, but C-2 grades may be successful on good setups. Use positive rake. Speed: 50-60 sfm. Feed: Same as high speed steel. Oil or water-base coolants will reduce thermal shock damage.
Drilling C-2 grade not recommended, but tipped drills may be successful on rigid setup if no great depth. The web must thinned to reduce thrust. Use 135 degree included angle on point. Gun drill can be used. Speed: 50 sfm. Oil or water-base coolant. Coolant-feed carbide tipped drills may be economical in some setups.
Reaming C-2 or C-3 grade: Tipped reamers recommended, solid carbide reamers require vary good setup. geometry same as high speed steel. Speed: 50 sfm. Feed: Same as high speed steel.
Tapping Not recommended, machine threads, or roll-form them.
Electrical Discharge Machining The alloys can be easily cut using any conventional electrical discharge machining system (EDM) or wire (EDM).
Notes
  • SCEA - Side cutting edge angle or lead angle of the .
  • At any point where dry cutting is recommended, an air jet directed on the may provide substantial life increases. A water-base coolant mist may also be effective.
  • Oil coolant should be premium quality, sulfochlorinated oil with extreme pressure additives. A viscosity at 100 degrees F from 50 to 125 SSU.
  • Water-base coolant should be premium quality, sulfochlorinated water soluble oil or chemical emulsion with extreme pressure additives. Dilute with water to make 15:1 mix. Water-base coolant may cause chipping and rapid failure of carbide s in interrupted cuts.
  • M-40 series High Speed Steels include M-41 , M-42, M-43, M-44, M-45 and M-46 at the time of writing. Others may be added and should be equally suitable.
  • Oil coolant should be a premium quality, sulfochlorinated oil with extreme pressure additives. A viscosity at 100 degree F from 50 to 125 SSU.
  • Water-base coolant should be premium quality, sulfochlorinated water soluble oil or chemical emulsion with extreme pressure additives. Dilute with water to make 15:1 mix.
Alloy 718

About High Performance Alloys
High Performance Alloys is an ISO 9001:2008 Registered Manufacturer & Distributor of Super Alloys We manufacture custom items, special grades and tempers. Ask our technical department for assistance today. Our forging processes allow manufacturing many difficult to produce alloys. we have put material into naval, aerospace and space applications. In-house open die forging of super alloy, Nickel alloys, and super stainless items. This expands our range of production up through 12" diameter, and 18" wide. Part size form 20lbs. to 3000 lbs. produced in our tiptop facility, allowing grater scheduling flexibility and control for our customers.

Require custom plate or sheet size?
We can help there, as well. We rolled over 50 tons of our own plate and sheet last year. If you're requirement is for a small cold rolled item see information on our Rolling Capability, including cold rolled rounds, squares and flats Our GFM rotary forge capabilities, including round, square and flat Configuration for cold or hot working materials.

Introducing Dynamic Waterjet.
Excellent edge quality, tight tolerances, and faster cutting ability than conventional waterjets. Less taper and tighter tolerances combine to make this abrasive cutting process the next standard in semi-finished parts. Your part design can have multiple edge qualities on different areas - as required for application. an edge not critical can be cut faster than a corner that must fit snug. Holes can be cut tighter with virtually no keyhole effect.

One piece to mill quantities, and everything in between.
As a secondary producer as well as a distributor of high performance alloys, HPAlloys can help solve your corrosion, temperature and wear problems. How can we serve you today?
An ISO 9001:2008 Registered
Manufacturer & Distributor of
Super Alloys