S+D METALS

+49 4174 66 94-0

info@sd-metals.com

Nickel Alloy 718 round bar
 
 

Nickel Alloy 718 with improved corrosion resistance, extremely high strength and excellent weldability

 

ALLOY 718 | 2.4668 - Data sheet

UNS N07718 | AMS 5662 | AMS 5663 | ASTM B637 | AMS 5596 | ASTM B670 | DMD 424-22 | API 6A | NACE MR0175

Alloy 718 is a precipitation hardened nickel-chromium alloy with additions of niobium, molybdenum, aluminium and titanium for improved corrosion resistance combined with extremely high strength and excellent weldability, including resistance to cracking after welding. For aerospace applications (AMS 5662/5663) Alloy 718 has excellent creep rupture strength at temperatures up to 700 °C. Alloy 718 achieves its strength through a precipitation hardening heat treatment and can be supplied in the annealed condition (AMS 5662) for ease of fabrication, requiring later heat treatment to develop full strength, or in the fully precipitation strengthened condition (AMS 5663).

Though originally developed for aerospace applications the unique combination of strength and corrosion resistance of alloy 718 made it candidate for applications in the oil and gas sector. As well environments became more severe stress corrosion and hydrogen embrittlement became a challenge the chemistry and microstructure of alloy 718 was optimised to offer the greatest resistance and distinguishes today’s oil field grade (API 6A) from aerospace grades. For oil and gas applications alloy 718 is produced to meet API 6A and NACE MR0175 requirements.  The specification API6A has tighter controls on chemistry and is heat treated following a different solution annealing and precipitation hardening procedure as compared to the AMS specifications.

With different specification and heat treatment procedures resulting in optimised properties for the industry sector it is important to understand which specification is required.

Product forms for ALLOY 718 | 2.4668

Round bars
Round bars in AMS 5662: Dimensions from 12,7 mm to 187,32 mm Diameter available in stock
  • 12,70 mm Ø
  • 16,00 mm Ø
  • 20,00 mm Ø
  • 25,00 mm Ø
  • 25,40 mm Ø
  • 32,00 mm Ø
  • 35,00 mm Ø
  • 40,00 mm Ø
  • 45,00 mm Ø
  • 50,80 mm Ø
  • 65,00 mm Ø
  • 76,20 mm Ø
  • 82,50 mm Ø
  • 85,00 mm Ø
  • 95,00 mm Ø
  • 101,60 mm Ø
  • 114,30 mm Ø
  • 127,00 mm Ø
  • 152,40 mm Ø
  • 165,10 mm Ø
  • 177,80 mm Ø
  • 187,32 mm Ø
Round bars
Round bars in AMS 5663: Dimensions from 12,7 mm to 101,60 mm Diameter available in stock
  • 12,70 mm Ø
  • 20,00 mm Ø
  • 25,40 mm Ø
  • 35,00 mm Ø
  • 50,80 mm Ø
  • 60,00 mm Ø
  • 76,20 mm Ø
  • 88,90 mm Ø
  • 101,60 mm Ø

Plates ≤ 25,4 mm according to AMS 5596

Plates
Dimensions from 12,7 mm to 50,80 mm Thickness available in stock
  • 12,70 mm
  • 16,00 mm
  • 25,40 mm
  • 32,00 mm
  • 44,45 mm
  • 50,80 mm

Areas of application for ALLOY 718 | 2.4668

Gas turbine compressor blades, disks and shafts; high strength springs; high strength fasteners; pumps and valves.

 

Characteristics ALLOY 718 | 2.4668

Chemical composition - limits in %

Chemical elements AMS5662/5663 API 6A
Ni 50,00 - 55,00 50,00 - 55,00
Cr 17,00 - 21,00 17,00 - 21,00
Nb 4,75 - 5,50 4,87 - 5,20
Mo 2,80 - 3,30 2,80 - 3,30
Co max. 1,00 max. 1,00
Ti 0,65 - 1,15 0,80 - 1,15
Al 0,20 - 0,80 0,40 - 0,60
Mn max. 0,35 max. 0,35
Cu max. 0,30 max. 0,23
C max. 0,08 max. 0,045
P max. 0,015 max. 0,010
S max. 0,015 max. 0,010
Pb max. 0,0005 max. 0,001
Se max. 0,0003 max. 0,0005
Bi max. 0,00003 max. 0,00005
Fe Rest Rest

Physical constants and thermal properties

Density 8,19 g/cm³
Melting point 1260 - 1336 °C
Thermal conductivity at 20°C 9,5 W/m · °C
Coefficient of expansion
at 21 - 93°C
13,1 μm/m · °C

Typical mechanical properties (room temperature)

Specification AMS 5663 AMS 5596 API 6A
Yield strength min. 1034 MPa min. 1034 MPa min. 827 MPa
Tensile strength min. 1275 MPa min. 1240 MPa min. 1034 MPa
Elongation min. 12% min. 12% min. 20%
Hardness     32-40 HRC*

*NACE MR0175 requires hardness 40 HRC max. only

All information is subject to change without notice. The properties correspond to the material in the heading. They may vary for other specifications. Please contact us for more details.

 

Service

PDF Download

Material cutting:

S+D METALS is more than just a stockist. Save time and a processing step by letting S+D METALS cut your coils, sheets, plates, and round bars to size according to your specifications in S+D METALS own machine park or by one of our capable partners. All this within the shortest time possible.

More details can be found here

Your contact

Julius Mönkeberg

Julius Mönkeberg
Product Manager Nickel and Cobalt Alloys
+49 4174 66 94-118
j.moenkeberg@sd-metals.com

Jacob Schmidt

Jacob Schmidt
Sales Nickel and Cobalt Alloys
+49 4174 66 94-217
j.schmidt@sd-metals.com