ALLOY 718

ALLOY718 (Inconel718)

Characteristics
Corrosion Resistance
Applications
Chemical Composition
Mechanical properties
International Standard Comparision Chart Stock Form And Sizes
Round Bars
Hex Bars
Nuts And Washers
Spring Washer
Hex Bolt
Stud Bolt
Flanges
Sourceable Materials

Characteristics

ALLOY718 is a precipitation-hardenable Ni-Cr-Fe alloy containing significant amounts of Nb & Mo as well as lesser amounts of Al+Ti. The alloy has good ductility in the annealed condition and high strength up to 700 °C (1300 °F).

  • good fabrication characteristics in the annealed condition
  • good tensile, fatigue and creep-rupture strengths
  • high-temperature strength up to 700 °C (1300°F)
  • good oxidation resistance up to 1000°C (1830°F)
  • excellent mechanical properties in cryogenic environments
  • excellent corrosion resistance at high and low temperatures and good resistance to stress-corrosion cracking and pitting corrosion
  • good weldability by arc and resistance welding processes without susceptibility to post-weld cracking
Density8.19

Stock Form and Sizes

※ ◆1000㎜ ◎2000㎜ ▲3000㎜ ■3500㎜ ●4000㎜ ★2500㎜~3990㎜

ALLOY 718ST Round bars Specification:Round bars
(ST:Solution Annealed) AMS5662
ST/AG Common Standard:ASTM B637 ASME SB637 ※GE C50TF13(Chemical composition only) ※GE
B50T69(Chemical composition only) ※GE B50TF15 A&D(Chemical composition only) GE S-1000 GE S-400

★/▲ALLOY718 ST ☆ALLOY718 AG

size 1〜13
1.2 1.6 2 2.6 3 3.5 4 4.4 5 5.3 6 7.1 8 8.95 10 12 13
                       
size 16〜50
16 18 19 20 22 24 25 28 30 32 35 36 38 40 42 45 50
     
size 55〜135
55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135
     
size 140〜300
140 145 150 160 165 170 180 190 200 210 220 230 250 280 300    
         
ALLOY 718AG Round bars Specification:Round bars
(AG:Age Hardened) AMS5663
ST/AG Common Standard:ASTM B637 ASME SB637 ※GE C50TF13(Chemical composition only) ※GE
B50T69(Chemical composition only) ※GE B50TF15 A&D(Chemical composition only) GE S-1000 GE S-400

★/▲ALLOY718 ST ☆ALLOY718 AG

size 1〜13
1.2 1.6 2 2.6 3 3.5 4 4.4 5 5.3 6 7.1 8 8.95 10 12 13
                         

size 16〜50
16 18 19 20 22 24 25 28 30 32 35 36 38 40 42 45 50
       
size 55〜135
55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135

101.6
       
size 140〜300
140 145 150 160 165 170 180 190 200 210 220 230 250 280 300    
   
 
 

   

Sourceable Ex-Stock Material for other Forms from Distributors World-Wide

Equivalent Round Bars Plates/Sheets Pipe/Tube Welding Rod & Wire
Min Max Min Max
Inconel718 ST
Round bars(ASTM B637/AMS5662)
Plate(ASTM B670/AMS5596)
6.35〜305 0.25〜101.6  
Equivalent Round Bars Plates/Sheets Pipe/Tube Welding Rod & Wire
Min Max Min Max
Inconel718 AG
(API6A/NACE)
12.7〜350      
Equivalent Round Bars Plates/Sheets Pipe/Tube Welding Rod & Wire
Min Max Min Max
Inconel718 AG
(ASTM B637/AMS5663)
4.75〜203.2      

*○: Various sizes available in stock. △: Only limited sizes available in stock. ☆: Please contact us for more details.
* We can supply materials and products that comply with various standards including ASTM, ASME, AMS, and NACE standards. Please contact us for more details.

Corrosion resistance

The high chromium and molybdenum contents of Alloy 718 impart excellent resistance to uniform and localized corrosion, such as pitting in many media at both high and low temperatures. The chromium also enables it to withstand chloride-ion stress-corrosion cracking which makes it an excellent alloy for service in oil and sour gas (H2S containing) environments as well as seawater.
Alloy 718 is generally only used for applications not exceeding 700 °C (1300 °F). However, oxidation resistance up to 1000 °C (1830 °F) is particularly high and comparable to that of other gamma-prime (γ’) strengthened superalloys

Applications

Due to its high-temperature strength up to 700 °C (1300 °F), excellent corrosion resistance and ease of fabrication ALLOY718 finds applications in many fields. Initially it was used as a turbine disk material in aircraft jet engines. Here resistance to creep and stress rupture was most important.
Because of its properties, fabricability and cost effectiveness it has since gained wider acceptance. To-day applications vary from highly stressed rotating and static components in gas turbines and rocket engines to high-strength bolting, springs and fasteners, components in nuclear reactors and space vehicles as well as high-temperature tooling for extrusion, of for example copper, and shearing. Another more recent important application involves pump shafts and other highly stressed well head and downhole components in offshore and marine engineering. Particularly useful is the alloy for drilling equipment in sour (containing H2S, CO2 and chlorides) oil and gas wells.

Chemical composition

  Ni Cr Fe C Mn Si Cu Mo Co Nb Al Ti B
min 50.0 17.0 bal.         2.80   4.75 0.20 0.65  
max 55.0 21.0 0.08 0.35 0.35 0.30 3.30 1.0 5.50 0.80 1.15 0.006
  P S Pb Se Bi Ta
min           0.05
max 0.015 0.015 5ppm 3ppm 0.3ppm

※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

Mechanical properties(Round Bar)

  Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Reduction of Area(%) Hardness(HB)
ASTM Min Value 1034 1275 12 15 331
Typical Values at RT 1176 1343 17   382

Above standard values and typical values of Round Bar.
Please contact us with any questions about reference or value of plate and pipe.
※Grade 1
※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

International Standard Comparison Chart

  Material Round Bars Plates/Sheets Pipe/Tube
Seamless Welded
ASTM UNS
N07718
B673 B670    
ASME SB673 SB670    
JIS NCF718 H4553 G4901 H4552  
DIN 2.4668 17752 17750 17751  
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