Difference Between Inconel 625 and 718

INCONEL 625 (ALLOY 625 UNS N06625)

Common Trade Names :
Inconel 625®, Chronin® 625, Altemp® 625, Haynes® 625, Nickelvac® 625, Nicrofer® 6020

Inconel ® 625 is a nonmagnetic, corrosion and oxidation resistant, nickel-base alloy. Alloy 625 has high strength and toughness in the temperature range cryogenic to 2000°F (1093°C) which is derived largely from the solid solution effects of the refractory metals, columbium and molybdenum, in a nickel-chromium matrix. Alloy 625 has excellent fatigue strength and stress - corrosion cracking resistance to chloride ions.

INCONEL® 625 LCF is a variant of INCONEL® 625. LCF stands for Low Cycle Fatigue. This means that the alloy has improved cycle fatigue properties and better thermal fatigue resistance. In other aspects such as chemical composition and other mechanical properties the alloy is similar to INCONEL® 625. The alloy is e.g. used for bellows, aircraft exhausts and expansion joints.

Chemical Analysis of ALLOY 625 (UNS N06625)
Common Names : Inconel 625®, Chronin® 625, Altemp® 625, Haynes® 625, Nickelvac® 625, Nicrofer® 6020

ASTM Specifications

Pipe Smls Pipe Welded Tube Smls Tube Welded Sheet/Plate Bar Forging Fitting Wire
B444 B705 B444 B704 B443 B446 - - -

Mechanical Properties 
Representative Tensile Properties, bar, 1800° F anneal

Temp° F Tensile (psi) .2% Yield (psi) Elongation in 2 “ (%)
70 144,000 84,000 44
400 134,000 66,000 45
600 132,000 63,000 42.5
800 131,500 61,000 45
1000 130,000 60,500 48
1200 119,000 60,000 34
1400 78,000 58,500 59
1600 40,000 39,000 117

Inconel 625 Melting Point

Melting Point 1290 - 1350 °C 2350 - 2460 °F

Inconel 625 Equivalent

STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN
Inconel 625 2.4856 N06625 NCF 625 NA 21 ХН75МБТЮ NC22DNB4MNiCr22Mo9Nb NiCr23Fe

INCONEL 718 (UNS N07718)

Inconel Alloy 718 is austenitic nickel-based superalloy. Inconel 718 is designated as UNS N07718 and Werkstoff Number 2.4668. Inconel 718 is also known as Nicrofer 5219, Superimphy 718, Haynes 718, Pyromet 718, Supermet 718. and Udimet 718. Inconel 718 Chemistry is Nickel 52%, Chromium 19%, Iron, 18%, Columbium 5%, Molybdenum 3%, Titanium 1%. Alloy 718 is mainly used in Gas turbine engines ducts, cryogenic tanks, springs and fasteners and motor components. For most applications, Alloy 718 / Inconel 718 is specified as: solution annealed and precipitation hardened. Inconel Alloy 718 is hardened by the precipitation of secondary phases.

Inconel 718 Chemical Composition, %

Ni Fe Cr Cu Mo Nb C Mn
50.00-55.00 Remainder 17.00-21.00 .30 max 2.80-3.30 4.75-5.50 .08 max .35 max
P S Si Ti Al Co B  
.015 max .015 max .35 max .65-1.15 .20-.80 1.00 max .006 max

Inconel 718 ASTM Specifications

Sheet/Plate Bar Wire
B670 B637 -

Inconel 718 Mechanical Properties  
Typical room temperature properties, 1800°F annealed condition

Ultimate Tensile Strength, psi .2% Yield Strength psi Elongation % Hardness Rockwell B
135,000 70,000 45 100

Inconel 718 Melting Point

Solution Treated
Solution Treated and Aged
Density
0.296 lb/in3 (8.192 g/cm3)
0.297 lb/in3 (8.22 g/cm3)
Specific Gravity
8.19
8.22
Melting Range
2500-2600°F
1370-1430°C

Inconel 718 Equivalent

STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN
Inconel 718 2.4668 N07718 NCF 718

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