AWS E309LMo vs. S21800 Stainless Steel

Both AWS E309LMo and S21800 stainless steel are iron alloys. They have 86% 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 AWS E309LMo and the bottom bar is S21800 stainless steel.

AWS E309LMo (W30923) Weld Metal UNS S21800 (Alloy 218) Stainless Steel

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		34
Elongation at Break, %		40

Poisson's Ratio		0.28
Poisson's Ratio		0.28

Shear Modulus, GPa		79
Shear Modulus, GPa		75

Tensile Strength: Ultimate (UTS), MPa		580
Tensile Strength: Ultimate (UTS), MPa		740

Thermal Properties

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

Melting Completion (Liquidus), °C		1430
Melting Completion (Liquidus), °C		1360

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

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

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

Otherwise Unclassified Properties

Base Metal Price, % relative		22
Base Metal Price, % relative		15

Density, g/cm³		7.9
Density, g/cm³		7.5

Embodied Carbon, kg CO₂/kg material		4.2
Embodied Carbon, kg CO₂/kg material		3.1

Embodied Energy, MJ/kg		59
Embodied Energy, MJ/kg		45

Embodied Water, L/kg		180
Embodied Water, L/kg		150

Common Calculations

PREN (Pitting Resistance)		32
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

Strength to Weight: Axial, points		21
Strength to Weight: Axial, points		27

Strength to Weight: Bending, points		20
Strength to Weight: Bending, points		24

Thermal Shock Resistance, points		15
Thermal Shock Resistance, points		17

Alloy Composition

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

Chromium (Cr), %		22 to 25
Chromium (Cr), %		16 to 18

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

Iron (Fe), %		53.6 to 63.5
Iron (Fe), %		59.1 to 65.4

Manganese (Mn), %		0.5 to 2.5
Manganese (Mn), %		7.0 to 9.0

Molybdenum (Mo), %		2.0 to 3.0
Molybdenum (Mo), %		0

Nickel (Ni), %		12 to 14
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), %		0 to 1.0
Silicon (Si), %		3.5 to 4.5

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