Acciaio 17-4 PH
Acciaio inossidabile al Cr-Ni-Cu indurente per precipitazione, di comprovata resistenza alla corrosione nelle situazioni più aggressive, simile a quella dell'acciaio serie 304.
Potendone modificare le caratteristiche meccaniche mediante un opportuno trattamento termico, la marca è assimilabile agli acciai martensitici.
Ideale per applicazioni in ambienti altamente corrosivi quindi specialmente per i settori come l'industria petrolchimica, motoristica, oil & gas; e per la realizzazione di valvole.
Lavorazioni in meccanica di precisione MIRA per l'acciaio 17-4 PH in fresatura CNC, elettroerosione a filo e tornitura CNC o in alternativa nella prototipazione in sinterizzazione DMLS.
Densità 7,80 g /cm³
Dati Tecnici Materiale
| Technical Data | Test Method | |
| Typical achievable part accuracy, small parts | - - - - - - - | approx. ±20-50 μm |
| Typical achievable part accuracy, large parts [1] | - - - - - - - | approx. ± 0.2 % |
| Min. wall thickness [2] | - - - - - - - | approx. 0.3 - 0.4 mm |
| Surface roughness[2] after shot-peening | - - - - - - - |
Ra 2.5 - 4.5 μm Ry 15 - 40 μm |
| Surface roughness after polishing | - - - - - - - | Rz up to < 0,5 μm |
| Physical and Chemical properties of parts | Test Method | |
| Material composition steel including alloying elements | - - - - - - - |
Cr (15 – 17.5 wt-%) Ni (3 - 5 wt-%) Cu (3 - 5 wt-%) Mn (max. 1 wt-%) Si (max. 1 wt-%) Mo (max. 0.5 wt-%) Nb (0.15 - 0.45 wt-%) C (max. 0.07 wt-%) |
| Relative density with standard parameters | - - - - - - - | approx. 100 % |
| Density with standard parameters | - - - - - - - |
min. 7.8 g/cm3 |
| Mechanical properties of parts [3] | Test Method | As Manufactured | Stress relieved (1 hour at 650 °C) |
| Ultimate tensile strength in horizontal direction (XY) | ISO 6892:1998(E) Annex C |
min 850 MPa (123 ksi) typical 930 ± 50 MPa (135 ± 7 ksi) |
typical 1100 MPa (160 ksi) |
| Ultimate tensile strength in vertical direction (Z) | ISO 6892:1998(E) Annex C |
min 850 MPa (123 ksi) typical 960 ± 50 MPa (139 ± 7 ksi) |
typical 980 MPa (142 ksi) |
| Yield strength, ReL, Lower yield strength) in horizontal direction (XY) | ISO 6892:1998(E) Annex C |
min 530 MPa (77 ksi) typical 586 ± 50 MPa (85 ± 7 ksi) |
typical 590 Mpa (86 ksi) |
| Yield strength, ReL, Lower yield strength) in vertical direction (Z) | ISO 6892:1998(E) Annex C |
min 530 MPa (77 ksi) typical 570 ± 50 MPa (83 ± 7 ksi) |
typical 550 MPa (80 ksi) |
| Yield strength, ReH, Upper yield strength) in horizontal direction (XY) | ISO 6892:1998(E) Annex C |
min 595 MPa (86 ksi) typical 645 ± 50 MPa (94 ± 7 ksi) |
typical 634 MPa (92 ksi) |
| Yield strength, ReH, Upper yield strength) in vertical direction (Z) | ISO 6892:1998(E) Annex C |
min 580 MPa (84 ksi) typical 630 ± 50 MPa (91 ± 7 ksi) |
typical 595 MPa (86 ksi) |
| Young’s modulus | ISO 6892:1998(E) Annex C | 170 ± 30 | typical 180 GPa |
| Elongation at break in horizontal direction (XY) | ISO 6892:1998(E) Annex C |
min 25 % typical 31 ± 5 % | typical 29 % |
| Elongation at break in vertical direction (Z) | ISO 6892:1998(E) Annex C | min 25 % typical 35 ± 5 % | typical 31 % |
| Hardness [4] as built | ISO 6892:1998(E) Annex C | approx. 230 ± 20 HV1 | - - - - - - - |
| Hardness [4] ground and polished [5] | ISO 6892:1998(E) Annex C | approx. 250 - 400 HV1 | - - - - - - - |
| Thermal properties of parts | Test Method | |
| Coefficient of thermal expansion over 20-600°C (68-1080 °F) | - - - - - - - | 14 x 10-6 m/m °C |
| Thermal conductivity at 20 °C (68 °F) | - - - - - - - | 13 W/m °C |
| Thermal conductivity at 100 °C (212 °F) | - - - - - - - | 14 W/m °C |
| Thermal conductivity at 200 °C (392 °F) | - - - - - - - | 15 W/m °C |
| Thermal conductivity at 300 °C (572 °F) | - - - - - - - | 16 W/m °C |
| Maximum operating temperature | - - - - - - - | 550 °C (1022 °F) |