Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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Sources7 documents: Copper Development Association, EOS GmbH, Wieland, Steel Construction Institute, Cleveland-Cliffs
Copper C10100
C10100 oxygen-free electronic (OFE) copper, annealed to 0.050 mm grain size (OS050), 0.04 in. flat products, copper.org typical values
DMLS 316L Stainless Steel
EOS StainlessSteel 316L (powder 9011-0032), EOS M 290, ParameterSet 316L 20µm Surface M290/400W, as manufactured, horizontal; ISO 6892-1
1
C10100 Alloy (copper.org)Copper Development Associationarchived copyCopper C10100 · Yield strength: typical, 0.5% extension under load, 0.04 in. flatCopper C10100 · Ultimate tensile strength: typical, 0.04 in. flatCopper C10100 · Elongation at break: typical, 0.04 in. flatCopper C10100 · Young's modulus (stiffness): typicalCopper C10100 · Density: nominalCopper C10100 · Thermal conductivity: typical, 20 °CCopper C10100 · Thermal expansion: typical, mean 20-100 °CCopper C10100 · Specific heat: typical, 20 °CCopper C10100 · Melting point: melting point (liquidus = solidus, pure copper)
2
EOS StainlessSteel 316L Material Data SheetEOS GmbHarchived copyDMLS 316L Stainless Steel · Yield strength: typical, as manufactured, horizontalDMLS 316L Stainless Steel · Ultimate tensile strength: typical, as manufactured, horizontalDMLS 316L Stainless Steel · Elongation at break: typical at break, as manufactured, horizontalDMLS 316L Stainless Steel · Thermal expansion: mean 25-100 °C, ASTM E228
3
EOS StainlessSteel 316L Material Data Sheet, M 280 and M 290 (2014)EOS GmbHarchived copyDMLS 316L Stainless Steel · Young's modulus (stiffness): typical, as built, horizontal (XY); EOSINT M280-400W / M290-400W, 316L_Surface 1.0, 20 µm (2014 sheet)
4
EOS StainlessSteel 316L Material Data Sheet, FlexLine, M 290 (2016)EOS GmbHarchived copyDMLS 316L Stainless Steel · Density: part density (ISO 3369, not labelled min or typical), EOS M 290, 40 µm FlexLine
5
Wieland-K09 (Cu-OFE, C10100) Data SheetWielandCopper C10100 · Poisson's ratio: reference value at room temperature (Wieland-K09 = Cu-OFE = C10100, rolled products)
6
Design Manual for Structural Stainless Steel, 4th Edition (P413)Steel Construction Institutearchived copyDMLS 316L Stainless Steel · Poisson's ratio: base material: austenitic stainless steels incl. 1.4404 (316L), design value
7
316/316L Stainless Steel Product Data Bulletin (2021)Cleveland-CliffsDMLS 316L Stainless Steel · Thermal conductivity: base material: wrought 316/316L (Cleveland-Cliffs), at 100 °CDMLS 316L Stainless Steel · Specific heat: base material: wrought 316/316L (Cleveland-Cliffs), 0-100 °C
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
DMLS 316L Stainless Steel is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Mechanical
Is Copper C10100 stronger than DMLS 316L Stainless Steel?
DMLS 316L Stainless Steel is stronger: its yield strength is 530 MPa against 69 MPa for Copper C10100 (7.68x).
Which is lighter, Copper C10100 or DMLS 316L Stainless Steel?
DMLS 316L Stainless Steel is lighter: 7,900 kg/m³ against 8,941 kg/m³ for Copper C10100.
Which is stiffer, Copper C10100 or DMLS 316L Stainless Steel?
DMLS 316L Stainless Steel is stiffer: Young's modulus 185 GPa against 117 GPa for Copper C10100, so the same part in DMLS 316L Stainless Steel deflects less under the same load.
Which is lighter for the same job, Copper C10100 or DMLS 316L Stainless Steel?
For the same stiffness or strength: DMLS 316L Stainless Steel is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be
Copper C10100
DMLS 316L Stainless Steel
Stiff rod or tie (tension)
1.79x heavier
lighter
Stiff beam (bending)
42% heavier
lighter
Stiff panel or plate
32% heavier
lighter
Strong rod or tie
8.69x heavier
lighter
Strong beam
4.41x heavier
lighter
Strong panel or plate
3.14x heavier
lighter
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which is more ductile, Copper C10100 or DMLS 316L Stainless Steel?
Copper C10100 stretches further before it breaks: 45% elongation at break against 40% for DMLS 316L Stainless Steel.
Thermal
Which conducts heat better, Copper C10100 or DMLS 316L Stainless Steel?
Copper C10100 conducts heat better: 391 W/m·K against 16.2 W/m·K for DMLS 316L Stainless Steel.
Which expands less with temperature?
DMLS 316L Stainless Steel expands less: 15.7 µm/m·K against 16.9 µm/m·K for Copper C10100.