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SAE-AISI M7 Steel vs. Grade 250 Maraging Steel

Both SAE-AISI M7 steel and grade 250 maraging steel are iron alloys. They have 74% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M7 steel and the bottom bar is grade 250 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
970 to 1800

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1560
1480
Melting Onset (Solidus), °C 1510
1430
Specific Heat Capacity, J/kg-K 450
450
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 18
32
Density, g/cm3 8.1
8.2
Embodied Carbon, kg CO2/kg material 8.9
4.9
Embodied Energy, MJ/kg 130
65
Embodied Water, L/kg 100
140

Common Calculations

PREN (Pitting Resistance) 35
16
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 26 to 76
33 to 61
Strength to Weight: Bending, points 23 to 47
26 to 40
Thermal Shock Resistance, points 24 to 69
29 to 54

Alloy Composition

Aluminum (Al), % 0
0.050 to 0.15
Boron (B), % 0
0 to 0.0030
Calcium (Ca), % 0
0 to 0.050
Carbon (C), % 1.0 to 1.1
0 to 0.030
Chromium (Cr), % 3.5 to 4.0
0
Cobalt (Co), % 0
7.0 to 8.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
66.3 to 71.1
Manganese (Mn), % 0.15 to 0.4
0 to 0.1
Molybdenum (Mo), % 8.2 to 9.2
4.6 to 5.2
Nickel (Ni), % 0 to 0.3
17 to 19
Phosphorus (P), % 0 to 0.030
0 to 0.010
Silicon (Si), % 0.2 to 0.55
0 to 0.1
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0.3 to 0.5
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0
Zirconium (Zr), % 0
0 to 0.020

Comparable Variants