X1 MaterialData 420SS 062519.pdf
420 Stainless Steel
Infiltrated with Bronze
ExOne™
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ExOne's 3D Printed 420 Stainless Steel infiltrated with Bronze is a matrix material composed of 60% stainless steel and 40% bronze infiltrant. This material offers good mechanical properties, is available in both an annealed and non-annealed condition, is able to be machined, welded and polished, and offers excellent wear resistance.
Applications
This material system is ideally suited for parts exposed to highly abrasive environments such as pump components, and parts for down-hole drilling and mining equipment. Additional applications include industrial components, molds, tooling, art objects and decorative hardware.
Composition
- Stainless Steel: Alloy 420
- Bronze: 90% Cu / 10% Sn
Printing
Using binder jetting technology, ExOne's state-of-the-art 3D Printing machines produce parts directly from CAD models by precisely controlling the jetting of binder onto a powder bed, and then subsequently spreading new layers of powder. This process is repeated until the part is completed. This 3D Printing process offers increased design flexibility, reduced manufacturing cost and shortened lead times.
Post Processing
After printing is complete, the parts are cured in an oven, which enables the parts to be handled. After curing, the parts are sintered and infiltrated with bronze above 1100°C. Cool down can be varied to control the machinability and hardness of the material.
Typical Material Properties
| Material Properties | Test Method |
|---|---|
| Tensile Strength | ASTM E8 |
| 99 ksi (682 MPa) | |
| Ultimate Strength | 66 ksi (455 MPa) |
| Yield Strength (0.2% offset) | |
| Elastic Modulus | 21.4 Mpsi (147 GPa) |
| Elongation | 2.3% |
| Hardness | ASTM E18 |
| 97 HRb | |
| Fractional Density | MPIF 42 |
| 95%+ | |
| Density | 0.284 lbs/in² (7.86 g/cm³) |
| Machinability | Refer to ExOne for recommendations |
| Weldability | Use silicone bronze rod & TIG weld |
| Thermal Conductivity | ASTM E1530 |
| 13 BTU/hr ft°F (22.6 W/m²/K) | |
| Specific Heat | ASTM E1263 |
| 0.114 BTU/lb °F (478 J/kg·K) | |
| Thermal Expansion Coefficient | ASTM E228 |
| 7.4 x 10⁻⁴/F (13.4 x 10⁻⁴/K) |
Surface Finish
- After sintering: = 600 μin Rₙ (15 μm Rₙ)
- Bead blasting: = 300 μin Rₙ (7.5 μm Rₙ)
- Barrel finishing: = 50 μin Rₙ (1.25 μm Rₙ)
Printed part, raw finish
Printed part, polished
ExOne disclaims all warranties and liabilities for the content hereof and makes no representations as to its accuracy or fitness for use for any purpose.