S21800 Stainless Steel vs. AWS E309H

Both S21800 stainless steel and AWS E309H are iron alloys. They have 88% 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 E309H.

UNS S21800 (Alloy 218) Stainless Steel AWS E309H 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, %		34

Poisson's Ratio		0.28
Poisson's Ratio		0.27

Shear Modulus, GPa		75
Shear Modulus, GPa		78

Tensile Strength: Ultimate (UTS), MPa		740
Tensile Strength: Ultimate (UTS), MPa		620

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		1410

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

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		3.7

Embodied Energy, MJ/kg		45
Embodied Energy, MJ/kg		52

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

Common Calculations

PREN (Pitting Resistance)		19
PREN (Pitting Resistance)		25

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		22

Strength to Weight: Bending, points		24
Strength to Weight: Bending, points		21

Thermal Shock Resistance, points		17
Thermal Shock Resistance, points		16

Alloy Composition

Carbon (C), %		0 to 0.1
Carbon (C), %		0.040 to 0.15

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

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

Iron (Fe), %		59.1 to 65.4
Iron (Fe), %		55.8 to 65.5

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

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0 to 0.75

Nickel (Ni), %		8.0 to 9.0
Nickel (Ni), %		12 to 14

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), %		0 to 1.0

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