S21800 Stainless Steel vs. EN 1.4740 Stainless Steel

Both S21800 stainless steel and EN 1.4740 stainless steel are iron alloys. Both are furnished in the annealed condition. 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 (15, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is EN 1.4740 stainless steel.

UNS S21800 (Alloy 218) Stainless Steel EN 1.4740 (GX40CrSi17) Cast Stainless Steel

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness		210
Brinell Hardness		260

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

Elongation at Break, %		40
Elongation at Break, %		22

Poisson's Ratio		0.28
Poisson's Ratio		0.28

Shear Modulus, GPa		75
Shear Modulus, GPa		77

Thermal Properties

Latent Heat of Fusion, J/g		340
Latent Heat of Fusion, J/g		300

Maximum Temperature: Corrosion, °C		410
Maximum Temperature: Corrosion, °C		410

Maximum Temperature: Mechanical, °C		900
Maximum Temperature: Mechanical, °C		900

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		1420

Melting Onset (Solidus), °C		1310
Melting Onset (Solidus), °C		1370

Specific Heat Capacity, J/kg-K		500
Specific Heat Capacity, J/kg-K		490

Thermal Expansion, µm/m-K		16
Thermal Expansion, µm/m-K		10

Otherwise Unclassified Properties

Base Metal Price, % relative		15
Base Metal Price, % relative		9.5

Density, g/cm³		7.5
Density, g/cm³		7.6

Embodied Carbon, kg CO₂/kg material		3.1
Embodied Carbon, kg CO₂/kg material		2.3

Embodied Energy, MJ/kg		45
Embodied Energy, MJ/kg		32

Embodied Water, L/kg		150
Embodied Water, L/kg		120

Common Calculations

PREN (Pitting Resistance)		19
PREN (Pitting Resistance)		18

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

Stiffness to Weight: Bending, points		26
Stiffness to Weight: Bending, points		25

Alloy Composition

Carbon (C), %		0 to 0.1
Carbon (C), %		0.3 to 0.5

Chromium (Cr), %		16 to 18
Chromium (Cr), %		16 to 19

Iron (Fe), %		59.1 to 65.4
Iron (Fe), %		75.4 to 82.7

Manganese (Mn), %		7.0 to 9.0
Manganese (Mn), %		0 to 1.0

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

Nickel (Ni), %		8.0 to 9.0
Nickel (Ni), %		0 to 1.0

Nitrogen (N), %		0.080 to 0.18
Nitrogen (N), %		0

Phosphorus (P), %		0 to 0.060
Phosphorus (P), %		0 to 0.040

Silicon (Si), %		3.5 to 4.5
Silicon (Si), %		1.0 to 2.5

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