DMLS 17-4PH Stainless Steel vs. Steel A992

Compare DMLS 17-4PH Stainless Steel vs. Steel A992 strength, stiffness, weight and thermal properties.

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DMLS 17-4PH Stainless Steel3D printed metal (DMLS)

Mechanical
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Yield strength	861MPasourcemean, as built, horizontal (N=72)	385MPasourcetypical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey), as reported by AISC
Ultimate tensile strength	886MPasourcemean, as built, horizontal (N=72)	505MPasourcetypical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey)
Elongation at break	19.9%sourcemean at break, as built, horizontal	not sourced
Young's modulus (stiffness)	197GPasourcebase material: wrought 17-4 PH, Condition H 900 (Cleveland-Cliffs)	200GPasourcedesign value (AISC 360-16)
Density	7,790kg/m³sourcemean part density (ISO 3369)	7,850kg/m³sourcenominal (constructional data)
Strength to weight	110kN·m/kg2.25x higher	49kN·m/kg
Stiffness to weight	25.3MN·m/kg	25.5MN·m/kg
Poisson's ratio	0.272sourcebase material: wrought 17-4 PH, all conditions (Cleveland-Cliffs)	0.3sourcedesign value (AISC 360-16 Commentary)
Shear modulus	77.4GPa	76.9GPa
Bulk modulus	144GPa	167GPa
Speed of sound	5,029m/s	5,048m/s
Thermal
Thermal conductivity	17.9W/m·Ksourcebase material: wrought 17-4 PH, Condition H 900, at 149 °C (Cleveland-Cliffs)	48W/m·Ksourcenominal at 20 °C
Thermal expansion	10.4µm/m·Ksourcemean 25-100 °C, ASTM E228, AFTER atmospheric heat treatment (as-built value not published)	12µm/m·Ksourcenominal (constructional data, no temperature range stated)
100 mm part over a 50 °C swing	52µm growth15% less	60µm growth
Specific heat	460J/kg·Ksourcebase material: wrought 17-4 PH, Condition A, 0-100 °C (Cleveland-Cliffs)	460–480J/kg·Ksourcebase material: EN S275JR unalloyed structural steel (the EN counterpart of A36), typical, 50/100 °C
Heats up and cools (diffusivity)	5mm²/s	13mm²/s2.6x faster
Thermal shock resistance	5,474W/m2% more resistant	5,390W/m
Values for	EOS StainlessSteel 17-4PH IndustryLine (powder 9011-0041), EOS M 290, 40 µm, default job 17-4PH_040_StainlessM291_100, as built, horizontal; ISO 6892 & ASTM E8M	ASTM A992 W-shapes; Fy/Fu specified minimums from AISC publications (AISC 360-16 Commentary; Modern Steel Construction); elastic constants AISC 360; physical constants from the bauforumstahl structural-steel EPD, which names A992 among covered product standards.

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

DMLS 17-4PH Stainless Steel is 3D printed: its properties depend on build direction and print settings; these are typical values.

Questions

Is DMLS 17-4PH Stainless Steel stronger than Steel A992?

DMLS 17-4PH Stainless Steel is stronger: its yield strength is 861 MPa against 385 MPa for Steel A992 (2.24x).

Which is lighter, DMLS 17-4PH Stainless Steel or Steel A992?

DMLS 17-4PH Stainless Steel is lighter: 7,790 kg/m³ against 7,850 kg/m³ for Steel A992.

Which is stiffer, DMLS 17-4PH Stainless Steel or Steel A992?

Steel A992 is stiffer: Young's modulus 200 GPa against 197 GPa for DMLS 17-4PH Stainless Steel, so the same part in Steel A992 deflects less under the same load.

Which is lighter for the same job, DMLS 17-4PH Stainless Steel or Steel A992?

For the same stiffness or strength: DMLS 17-4PH Stainless Steel is lighter for a strong rod or tie, strong beam, strong panel or plate.

Part that must be	DMLS 17-4PH Stainless Steel	Steel A992
Stiff rod or tie (tension)	about equal	about equal
Stiff beam (bending)	about equal	about equal
Stiff panel or plate	about equal	about equal
Strong rod or tie	lighter	2.25x heavier
Strong beam	lighter	1.72x heavier
Strong panel or plate	lighter	1.51x heavier

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 conducts heat better, DMLS 17-4PH Stainless Steel or Steel A992?

Steel A992 conducts heat better: 48 W/m·K against 17.9 W/m·K for DMLS 17-4PH Stainless Steel.

Which expands less with temperature?

DMLS 17-4PH Stainless Steel expands less: 10.4 µm/m·K against 12 µm/m·K for Steel A992.

Among 59 materials

Stiffness against density

Strength against density