ASTM A369 Grade FP12 vs. Grade 250 Maraging Steel

Both ASTM A369 grade FP12 and grade 250 maraging steel are iron alloys. They have 69% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP12 and the bottom bar is grade 250 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		20
Elongation at Break, %		7.3 to 17

Poisson's Ratio		0.29
Poisson's Ratio		0.3

Shear Modulus, GPa		73
Shear Modulus, GPa		75

Shear Strength, MPa		300
Shear Strength, MPa		600 to 1060

Tensile Strength: Ultimate (UTS), MPa		470
Tensile Strength: Ultimate (UTS), MPa		970 to 1800

Tensile Strength: Yield (Proof), MPa		250
Tensile Strength: Yield (Proof), MPa		660 to 1740

Thermal Properties

Latent Heat of Fusion, J/g		250
Latent Heat of Fusion, J/g		270

Melting Completion (Liquidus), °C		1470
Melting Completion (Liquidus), °C		1480

Melting Onset (Solidus), °C		1430
Melting Onset (Solidus), °C		1430

Specific Heat Capacity, J/kg-K		470
Specific Heat Capacity, J/kg-K		450

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		12

Otherwise Unclassified Properties

Base Metal Price, % relative		2.8
Base Metal Price, % relative		32

Density, g/cm³		7.9
Density, g/cm³		8.2

Embodied Carbon, kg CO₂/kg material		1.6
Embodied Carbon, kg CO₂/kg material		4.9

Embodied Energy, MJ/kg		21
Embodied Energy, MJ/kg		65

Embodied Water, L/kg		52
Embodied Water, L/kg		140

Common Calculations

PREN (Pitting Resistance)		2.8
PREN (Pitting Resistance)		16

Resilience: Ultimate (Unit Rupture Work), MJ/m³		81
Resilience: Ultimate (Unit Rupture Work), MJ/m³		130 to 150

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

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		17
Strength to Weight: Axial, points		33 to 61

Strength to Weight: Bending, points		17
Strength to Weight: Bending, points		26 to 40

Thermal Shock Resistance, points		14
Thermal Shock Resistance, points		29 to 54

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0.050 to 0.15

Boron (B), %		0
Boron (B), %		0 to 0.0030

Calcium (Ca), %		0
Calcium (Ca), %		0 to 0.050

Carbon (C), %		0.050 to 0.15
Carbon (C), %		0 to 0.030

Chromium (Cr), %		0.8 to 1.3
Chromium (Cr), %		0

Cobalt (Co), %		0
Cobalt (Co), %		7.0 to 8.5

Iron (Fe), %		96.8 to 98.4
Iron (Fe), %		66.3 to 71.1

Manganese (Mn), %		0.3 to 0.61
Manganese (Mn), %		0 to 0.1

Molybdenum (Mo), %		0.44 to 0.65
Molybdenum (Mo), %		4.6 to 5.2

Nickel (Ni), %		0
Nickel (Ni), %		17 to 19

Phosphorus (P), %		0 to 0.025
Phosphorus (P), %		0 to 0.010

Silicon (Si), %		0 to 0.5
Silicon (Si), %		0 to 0.1

Sulfur (S), %		0 to 0.025
Sulfur (S), %		0 to 0.010

Titanium (Ti), %		0
Titanium (Ti), %		0.3 to 0.5

Zirconium (Zr), %		0
Zirconium (Zr), %		0 to 0.020