Inconel 625
Inconel 625 is a nickel alloy resistant to high temperature and corrosion. This type of material is characterised by high resistance to wear and tear and for the creation of finished parts boasting excellent tolerance to mechanical and thermal stress even when exposed oxidation-prone environments.
Inconel 718
Inconel 718 is a nickel alloy resistant to high temperatures (up to 700° C) and corrosion. This material is suitable for applications such as high temperature resistant parts of gas turbines and industrial installations, as well as for cryogenic applications.
Inconel 625 and 718: Precision machining and 3D printing with DMLS Metal Sintering.
Technical Data of the material and physical and chemical properties
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 |