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Stainless Steel 17-4 GP1
Stainless Steel 17-4 has very good corrosion resistance and mechanical properties, especially excellent ductility in laser processed state, and is widely used in a variety of engineering application.

Typical applications include:
  • Engineering applications including functional prototypes, small series products, individualized products or spare parts.
  • Parts requiring high corrosion resistance, sterilisability, etc
  • Parts requiring particularly high toughness and ductility.

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Stainless Steel 15-5 PH1
The key difference between the PH1 and the GP1 is the material hardness. Out of the machine and unfinished, the PH1 is harder than the GP1. Additionally, the PH1 can be hardened to a minimum of 40 HRC while the GP1 hardness cannot be increased. This allows the PH1 to perform better for designs that are used to cut or saw, and in stringent environments where hardness is integral.
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Cobalt Chrome MP1
Cobalt Chrome MP1 is a superalloy characterized by excellent mechanical properties (strength, hardness, etc.), corrosion resistance, and temperature resistance. Such alloys are commonly used in biomedical applications such as dental and medical implants (note: widely used in Europe but less so in North America), and also for high-temperature engineering applications such as aero engines.

Typical applications include:

  • Prototype or one-off biomedical implants, e.g. spinal, knee, hip bone, toe, and dental parts requiring high mechanical properties in elevated temperatures (500 - 1000 C) and with good corrosion resistance, e.g. turbines and other parts for engines, cutting parts, etc.
  • Parts having very small features such as thin walls, pins, etc., which require particularly high strength and /or stiffness.

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Technical Data (Comparison Chart)

MECHANICAL PROPERTIES
PROPERTIES ASTM Units Stainless Steel 17-4 Stainless Steel 15-5 Cobalt Chrome MP1
Ultimate Tensile Strength (MPIF 10)
(in horizontal direction xy)
(in vertical direction z)		   MPa 900 1150 ± 50 MPa
1050 ±50 MPa		 1400 MPa, ± 40 MPa
203 ksi, ± 6 ksi
1150 MPa,± 50 MPa
167 ksi ± 7 ksi
Yield Strength (rp 0.2%)
(in horizontal direction xy)
(in vertical direction z)		       1050 ±50 MPa
1000 ±50 MPa		 980 MPa, ± 30 MPa
142 ksi, ± 4 ksi
880 MPa, ± 40 MPa
128 ksi, ± 6 ksi
Elongation @ Break
(in horizontal direction xy)
(in vertical direction z)
(after hot isostatic pressing (hip)		   % up to 30% 16 ± 4 %
17 ± 4 %		 10%, ± 2%
9%, ± 1%
21, ± 24%
Young's Modulus
(in horizontal direction xy)
(in vertical direction z)		   GPa 190 typically 170 ± 20GPa 210 GPa, ± 10 GPa
30 msi, ± 1.5 msi
200 GPa, ± 20 GPa
29 msi, ± 3 msi
Hardness
as laser-sintered
after post-hardening		   HV
HRC		 250-320
40		 30-35 HRC 40-45HRC
Surface Roughness
after shot-peening
after polishing		     Ra 2.5-4.5um, Ry 15-40um
Ra 0.1-0.2mil, Ry 0.6-1.6um
Rz up to <0.5um
(can be very finely polished)		 Ra 2.5-4.5 um, Ry 15-40 um
Ra 0.1-0.2 mil, Ry 0.6-1.6 um
Rz up to < 0.5 um
(can be very finely polished)		 approx. Ra 10um, Rz 40-50um
Ra 0.39, Rz 1.6-2.0 mil
Rz up to < 1um
<0.004mil
last updated: 05.27.07

 

THERMAL PROPERTIES
PROPERTIES Stainless Steel 17-4 Stainless Steel 15-5 Cobalt Chrome MP1
Coefficient of Thermal Expansion
(20-500°C)
(500-1000°C)		 approx. 13-20 x 10-6 m/m °C
approx. 55-68 x 10-6 in/in °F		 13.8 ±0.8 W/m°C, (96 ± 6 Btu)
15.8 ±0.8 W/m°C (110 ± 6 Btu)		 11.5x10-6m/m °C
11.5x10-6in/in °C
12.5x10-6m/m °C
12.5x10-6in/in °C
Thermal Conductivity
( @ 20°C)
(@ 300°C)
(@ 500°C)		 approx. 12-14 W/mK
approx. 83-97 Btu(hft2°F/in)		 13.8 ± 0.8 W/m°C
13.7 ± 0.8 W/m°C		 11 W/mk
76 Btu(h.ft2.°F/in)
16W/mk
111 Btu(h.ft2.°F/in)
20 W/mk
139Btu(h.ft2.°F/in)
Maximum Operating Temperature 550°C
1000°C		 350-400°C 11500°C
21000°F
last updated: 05.27.07