SAE-AISI 8740 Steel vs. AWS BVAg-18

SAE-AISI 8740 steel belongs to the iron alloys classification, while AWS BVAg-18 belongs to the otherwise unclassified metals. There are 17 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 SAE-AISI 8740 steel and the bottom bar is AWS BVAg-18.

SAE-AISI 8740 (G87400) Ni-Cr-Mo Steel AWS BVAg-18 (P07607) Vacuum Service Filler Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		82

Poisson's Ratio		0.29
Poisson's Ratio		0.36

Shear Modulus, GPa		73
Shear Modulus, GPa		30

Tensile Strength: Ultimate (UTS), MPa		580 to 670
Tensile Strength: Ultimate (UTS), MPa		180

Thermal Properties

Latent Heat of Fusion, J/g		250
Latent Heat of Fusion, J/g		140

Melting Completion (Liquidus), °C		1460
Melting Completion (Liquidus), °C		720

Melting Onset (Solidus), °C		1420
Melting Onset (Solidus), °C		600

Specific Heat Capacity, J/kg-K		470
Specific Heat Capacity, J/kg-K		280

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		19

Otherwise Unclassified Properties

Density, g/cm³		7.8
Density, g/cm³		9.7

Embodied Carbon, kg CO₂/kg material		1.5
Embodied Carbon, kg CO₂/kg material		59

Embodied Energy, MJ/kg		20
Embodied Energy, MJ/kg		930

Common Calculations

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		4.7

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		15

Strength to Weight: Axial, points		20 to 24
Strength to Weight: Axial, points		5.1

Strength to Weight: Bending, points		20 to 22
Strength to Weight: Bending, points		7.3

Thermal Shock Resistance, points		17 to 20
Thermal Shock Resistance, points		8.1

Alloy Composition

Cadmium (Cd), %		0
Cadmium (Cd), %		0 to 0.0010

Carbon (C), %		0.38 to 0.43
Carbon (C), %		0 to 0.0050

Chromium (Cr), %		0.4 to 0.6
Chromium (Cr), %		0

Copper (Cu), %		0
Copper (Cu), %		28.5 to 31.5

Iron (Fe), %		96.5 to 97.7
Iron (Fe), %		0

Lead (Pb), %		0
Lead (Pb), %		0 to 0.0020

Manganese (Mn), %		0.75 to 1.0
Manganese (Mn), %		0

Molybdenum (Mo), %		0.2 to 0.3
Molybdenum (Mo), %		0

Nickel (Ni), %		0.4 to 0.7
Nickel (Ni), %		0

Phosphorus (P), %		0 to 0.035
Phosphorus (P), %		0 to 0.0020

Silicon (Si), %		0.15 to 0.35
Silicon (Si), %		0

Silver (Ag), %		0
Silver (Ag), %		59 to 61

Sulfur (S), %		0 to 0.040
Sulfur (S), %		0

Tin (Sn), %		0
Tin (Sn), %		9.5 to 10.5

Zinc (Zn), %		0
Zinc (Zn), %		0 to 0.0010