Inconel 625 e 718

Inconel 625


L' Inconel 625 è una lega di nichel resistente ad alte temperature e alla corrosione.
Questo tipo di materiale è caratterizzato da un'alta resistenza all'usura ed alla rottura e per la realizzazione di parti finite capaci vantare ottima tolleranza a stress meccanici e termici anche se esposti in ambiente tendente all'ossidazione.

Inconel 718


L' Inconel 718 è una lega di nichel resistente alle alte temperature (fino a 700° C) e alla corrosione.
Questo materiale è adatto alle applicazioni resistenti alle alte temperature come parti di turbine a gas ed impianti industriali oltre che per applicazioni criogeniche.


Inconel 625 e 718: lavorazioni meccaniche di precisione e stampa 3d con sinterizzazione metalli DMLS.

Dati Tecnici Materiale

Inconel 625

Technical Data Test Method  
Typical achievable part accuracy, small parts - - - - - - - approx. ± 40 – 60 μm
Typical achievable part accuracy, large parts - - - - - - - approx. ± 0.2%
Min. wall thickness [1] - - - - - - - approx. 0.3 mm - 0.4mm
Surface roughness [2] after shot-peening - - - - - - - Ra 4 - 6.5 μm, Rz 20 - 50 μm
Surface roughness [2] after polishing - - - - - - - Rz up to < 0.5 μm
Physical and Chemical properties of parts Test Method  
Material composition - - - - - - - Ni (balance ≥ 58.00 wt-%)
Cr (20.00 - 23.00 wt-%)
Mo (8.00 - 10.00 wt-%)
Nb (3.15 - 4.15 wt-%)
Fe (≤ 5.00 wt-%)
Ti (≤ 0.40 wt-%)
Al (≤ 0.40 wt-%)
Co (≤ 1.0 wt-%)
C (≤ 0.10 wt-%)
Ta (≤ 0.05 wt-%)
Si, Mn (each ≤ 0.50 wt-%)
P, S (each ≤ 0.015 wt-%)
Relative density - - - - - - - approx. 100 %
Density - - - - - - - approx. 8.4 g/cm3
Mechanical properties of parts at 20°C (68°F) Test Method As Built Stress Relieved [4]
Tensile strength [3] in horizontal direction (XY) ISO 6892-1:2009(B)
Annex D
typ. 990 ± 50 MPa
typ. 144 ± 7 ksi
min. 827 MPa (120ksi)
typ.1040 ± 100
MPa (151 ±15 ksi)
Tensile strength [3] in vertical direction (Z) ISO 6892-1:2009(B)
Annex D
typ. 900 ± 50 MPa
typ. 131 ± 7 ksi
min. 827 MPa (120 ksi)
typ. 930 ± 100 MPa
(135 ±15 ksi)
Yield strength (Rp 0.2 %) [3] in horizontal direction (XY) ISO 6892-1:2009(B)
Annex D
typ. 725 ± 50 MPa
typ. 105 ± 7 ksi
min. 414 MPa (60 ksi)
typ. 720 ± 100 MPa
(104 ±15 ksi)
Yield strength (Rp 0.2 %) [3] in vertical direction (Z) ISO 6892-1:2009(B)
Annex D
typ. 615 ± 50 MPa
typ. 89 ± 7 ksi
min. 414 MPa (60 ksi)
typ. 650 ± 100 MPa
(94 ±15 ksi)
Modulus of elasticity [3] in horizontal direction (XY) ISO 6892-1:2009(B)
Annex D
typ. 170 ± 20 GPa
typ. 25 ± 3 Msii
typ. 170 ± 20 GPa
typ. 25 ± 3 Msi
Modulus of elasticity [3] in vertical direction (Z) ISO 6892-1:2009(B)
Annex D
typ.140 ± 20 GPa
typ. 20 ± 3 Msisi
yp. 160 ± 20 GPa
typ. 23 ± 3 Msi
Elongation at break [3] in horizontal direction (XY) ISO 6892-1:2009(B)
Annex D
typ. (35 ± 5) % min. 30 %,
typ. (35 ± 5) %
Elongation at break [3] in vertical direction (Z) ISO 6892-1:2009(B)
Annex D
(42 ± 5) % min. 30 %,
typ. (44 ± 5) %
Hardness [5] EN ISO 6508-1 - - - - - - - approx. 30 HRC (287 HB)
Thermal properties of parts Test Method  
Maximum operating temperature for parts under load - - - - - - - approx. 650 °C
approx. 1200 °F
Oxidation resistance to - - - - - - - 980 °C
1800 °F



Inconel 718

Technical Data Test Method  
Typical achievable part accuracy, small parts - - - - - - - approx. ± 40 – 60 μm
Typical achievable part accuracy, large parts - - - - - - - approx. ± 0.2%
Min. wall thickness [1] - - - - - - - typ. 0.3 - 0.4 mm
typ. 0.012 – 0.016 inch
Surface roughness [2] after shot-peening - - - - - - - Ra 4 - 6.5 μm, Rz 20 - 50 μm
Surface roughness [2] after polishing - - - - - - - Rz up to < 0.5 μm
Physical and Chemical properties of parts Test Method  
Material composition - - - - - - - Ni (50 - 55 wt-%)
Cr (17.0 - 21.0 wt-%)
Nb (4.75 - 5.5 wt-%)
Mo (2.8 - 3.3 wt-%)
Ti (0.65 - 1.15 wt-%)
Al (0.20 - 0.80 wt-%)
Co (≤ 1.0 wt-%)
Cu (≤ 0.3 wt-%)
C (≤ 0.08 wt-%)
Si, Mn (each ≤ 0.35 wt-%)
P, S (each ≤ 0.015 wt-%)
B (≤ 0.006 wt-%)
Fe (balance)
Relative density - - - - - - - approx. 100 %
Density - - - - - - - approx. 8.15 g/cm3
Mechanical properties of parts at 20°C (68°F) As Built Heat treated per AMS 5662 [3] Heat treated per AMS 5664 [4]
Tensile strength [5] in horizontal direction (XY) typ. 1060 ± 50 MPa
(154 ± 7 ksi)
- - - - - - - - - - - - - -
Tensile strength [5] in vertical direction (Z) typ. 980 ± 50 MPa
(142 ± 7 ksi)
min. 1241 MPa (180 ksi)
typ. 1400 ± 100 MPa
(203 ± 15 ksi)
min. 1241 MPa (180 ksi)
typ. 1380 ± 100 MPa
(200 ± 15 ksi)
Yield strength (Rp 0.2 %) [5] in horizontal direction (XY) typ. 780 ± 50 MPa
(113 ± 7 ksi)
- - - - - - - - - - - - - -
Yield strength (Rp 0.2 %) [5] in vertical direction (Z) typ. 634 ± 50 MPa
(92 ± 7 ksi)
min. 1034 MPa (150 ksi)
typ. 1150 ± 100 MPa
(167 ± 15 ksi)
min. 1034 MPa (150 ksi)
typ. 1240 ± 100 MPa
(180 ± 15 ksi)
Modulus of elasticity [5] in horizontal direction (XY) typ. 160 ± 20 GPa
(23 ± 3 Msi)
- - - - - - - - - - - - - -
Modulus of elasticity [5] in vertical direction (Z) - - - - - - - 170 ± 20 GPa
24.7 ± 3 Msi
170 ± 20 GPa
24.7 ± 3 Msi
Elongation at break [5] in vertical direction (XY) typ. (27 ± 5) % - - - - - - - - - - - - - -
Elongation at break [5] in vertical direction (Z) typ. (31 ± 5) % min. 12 %
typ. (15 ± 3) %
min. 12 %
typ. (18 ± 5) %
Hardness [6] approx. 30 HRC
approx. 287 HB
approx. 47 HRC
approx. 446 HB
approx. 43 HRC
approx. 400 HB
Mechanical properties of parts at high temperature (649°C, 1200°F) As Built Heat treated per AMS 5662 [3] Heat treated per AMS 5664 [4]
Tensile strength (Rm) [7] in vertical direction (Z) - - - - - - - min. 965 MPa (140 ksi)
typ. 1170 ± 50 MPa
(170 ± 7 ksi)
typ. 1210 ± 50 MPa
(175 ± 7 ksi)
Yield strength (Rp 0.2 %) [7] in vertical direction (Z) - - - - - - - min. 862 MPa (125 ksi)
typ. 970 ± 50 MPa
(141 ± 7 ksi)
typ. 1010 ± 50 MPa
(146 ± 7 ksi)
Elongation at break [7] in vertical direction (Z) - - - - - - - min. 6 %
typ. (16 ± 3) %
typ. (20 ± 3) %
Stress-Rupture Properties [8] in vertical direction (Z) - - - - - - - min. 23 hours at stress
level 689 MPa
(100 ksi)
- - - - - - -
    51 ± 5 hours
(final applied stress to
rupture 792.5 MPa / 115 ksi)
81 ± 10 hours
(final applied stress to
rupture 861.5 MPa / 125 ksi)
Thermal properties of parts Test Method Heat treated per AMS 5662
Coefficient of thermal expansion over 25 - 200 °C (36 - 390 °F) - - - - - - - approx. 12.5 - 13.0 x 10-6 m/m°C
Coefficient of thermal expansion over 25 - 750 °C (36 - 930 °F) - - - - - - - approx. 16.6 - 17.2 x 10-6 m/m°C
Maximum operating temperature for parts under load - - - - - - - approx. 650 °C
approx. 1200 °F
Oxidation resistance up to - - - - - - - 980 °C
1800 °F

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