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
Density | ||
Specific Gravity | ||
Melting Range |
Inconel 718 Equivalent
STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
Inconel 718 | 2.4668 | N07718 | NCF 718 | – | – | – | – |
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