EN 1.4740 Stainless Steel vs. SAE-AISI A4 Steel

Both EN 1.4740 stainless steel and SAE-AISI A4 steel are iron alloys. They have 82% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.4740 stainless steel and the bottom bar is SAE-AISI A4 steel.

EN 1.4740 (GX40CrSi17) Cast Stainless Steel SAE-AISI A4 (T30104) Air-Hardening Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		200
Elastic (Young's, Tensile) Modulus, GPa		190

Poisson's Ratio		0.28
Poisson's Ratio		0.29

Shear Modulus, GPa		77
Shear Modulus, GPa		73

Thermal Properties

Latent Heat of Fusion, J/g		300
Latent Heat of Fusion, J/g		250

Melting Completion (Liquidus), °C		1420
Melting Completion (Liquidus), °C		1450

Melting Onset (Solidus), °C		1370
Melting Onset (Solidus), °C		1410

Specific Heat Capacity, J/kg-K		490
Specific Heat Capacity, J/kg-K		470

Thermal Conductivity, W/m-K		18
Thermal Conductivity, W/m-K		40

Thermal Expansion, µm/m-K		10
Thermal Expansion, µm/m-K		12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		2.2
Electrical Conductivity: Equal Volume, % IACS		7.4

Electrical Conductivity: Equal Weight (Specific), % IACS		2.6
Electrical Conductivity: Equal Weight (Specific), % IACS		8.6

Otherwise Unclassified Properties

Base Metal Price, % relative		9.5
Base Metal Price, % relative		3.9

Density, g/cm³		7.6
Density, g/cm³		7.8

Embodied Carbon, kg CO₂/kg material		2.3
Embodied Carbon, kg CO₂/kg material		1.8

Embodied Energy, MJ/kg		32
Embodied Energy, MJ/kg		24

Embodied Water, L/kg		120
Embodied Water, L/kg		59

Common Calculations

PREN (Pitting Resistance)		18
PREN (Pitting Resistance)		5.3

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		24

Thermal Diffusivity, mm²/s		4.8
Thermal Diffusivity, mm²/s		11

Alloy Composition

Carbon (C), %		0.3 to 0.5
Carbon (C), %		1.0 to 1.1

Chromium (Cr), %		16 to 19
Chromium (Cr), %		0.9 to 2.2

Copper (Cu), %		0
Copper (Cu), %		0 to 0.25

Iron (Fe), %		75.4 to 82.7
Iron (Fe), %		92 to 95.5

Manganese (Mn), %		0 to 1.0
Manganese (Mn), %		1.8 to 2.2

Molybdenum (Mo), %		0 to 0.5
Molybdenum (Mo), %		0.9 to 1.4

Nickel (Ni), %		0 to 1.0
Nickel (Ni), %		0 to 0.3

Phosphorus (P), %		0 to 0.040
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		1.0 to 2.5
Silicon (Si), %		0 to 0.5

Sulfur (S), %		0 to 0.030
Sulfur (S), %		0 to 0.030