S21800 Stainless Steel vs. AWS E2209

Both S21800 stainless steel and AWS E2209 are iron alloys. They have 90% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is AWS E2209.

UNS S21800 (Alloy 218) Stainless Steel AWS E2209 (W39209) Weld Metal

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		40
Elongation at Break, %		23

Poisson's Ratio		0.28
Poisson's Ratio		0.28

Shear Modulus, GPa		75
Shear Modulus, GPa		79

Tensile Strength: Ultimate (UTS), MPa		740
Tensile Strength: Ultimate (UTS), MPa		770

Thermal Properties

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

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		1440

Melting Onset (Solidus), °C		1310
Melting Onset (Solidus), °C		1390

Specific Heat Capacity, J/kg-K		500
Specific Heat Capacity, J/kg-K		480

Thermal Expansion, µm/m-K		16
Thermal Expansion, µm/m-K		14

Otherwise Unclassified Properties

Base Metal Price, % relative		15
Base Metal Price, % relative		20

Density, g/cm³		7.5
Density, g/cm³		7.8

Embodied Carbon, kg CO₂/kg material		3.1
Embodied Carbon, kg CO₂/kg material		4.0

Embodied Energy, MJ/kg		45
Embodied Energy, MJ/kg		55

Embodied Water, L/kg		150
Embodied Water, L/kg		170

Common Calculations

PREN (Pitting Resistance)		19
PREN (Pitting Resistance)		35

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

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

Strength to Weight: Axial, points		27
Strength to Weight: Axial, points		27

Strength to Weight: Bending, points		24
Strength to Weight: Bending, points		24

Thermal Shock Resistance, points		17
Thermal Shock Resistance, points		20

Alloy Composition

Carbon (C), %		0 to 0.1
Carbon (C), %		0 to 0.040

Chromium (Cr), %		16 to 18
Chromium (Cr), %		21.5 to 23.5

Copper (Cu), %		0
Copper (Cu), %		0 to 0.75

Iron (Fe), %		59.1 to 65.4
Iron (Fe), %		58.4 to 66.9

Manganese (Mn), %		7.0 to 9.0
Manganese (Mn), %		0.5 to 2.0

Molybdenum (Mo), %		0
Molybdenum (Mo), %		2.5 to 3.5

Nickel (Ni), %		8.0 to 9.0
Nickel (Ni), %		8.5 to 10.5

Nitrogen (N), %		0.080 to 0.18
Nitrogen (N), %		0.080 to 0.2

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

Silicon (Si), %		3.5 to 4.5
Silicon (Si), %		0 to 1.0

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