EN 1.4729 Stainless Steel vs. S21800 Stainless Steel

Both EN 1.4729 stainless steel and S21800 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 78% 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 EN 1.4729 stainless steel and the bottom bar is S21800 stainless steel.

EN 1.4729 (GX40CrSi13) Cast Stainless Steel UNS S21800 (Alloy 218) Stainless Steel

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness		260
Brinell Hardness		210

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

Elongation at Break, %		15
Elongation at Break, %		40

Poisson's Ratio		0.28
Poisson's Ratio		0.28

Shear Modulus, GPa		75
Shear Modulus, GPa		75

Thermal Properties

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

Maximum Temperature: Corrosion, °C		390
Maximum Temperature: Corrosion, °C		410

Maximum Temperature: Mechanical, °C		850
Maximum Temperature: Mechanical, °C		900

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

Melting Onset (Solidus), °C		1380
Melting Onset (Solidus), °C		1310

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

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

Otherwise Unclassified Properties

Base Metal Price, % relative		7.5
Base Metal Price, % relative		15

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

Embodied Carbon, kg CO₂/kg material		2.1
Embodied Carbon, kg CO₂/kg material		3.1

Embodied Energy, MJ/kg		29
Embodied Energy, MJ/kg		45

Embodied Water, L/kg		100
Embodied Water, L/kg		150

Common Calculations

PREN (Pitting Resistance)		14
PREN (Pitting Resistance)		19

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

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

Alloy Composition

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

Chromium (Cr), %		12 to 14
Chromium (Cr), %		16 to 18

Iron (Fe), %		80.4 to 86.7
Iron (Fe), %		59.1 to 65.4

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

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

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

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

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

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

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