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SAE-AISI M7 Steel vs. AISI 348H Stainless Steel

Both SAE-AISI M7 steel and AISI 348H stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M7 steel and the bottom bar is AISI 348H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
580

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1560
1430
Melting Onset (Solidus), °C 1510
1390
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 28
15
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 18
20
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.9
3.9
Embodied Energy, MJ/kg 130
56
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 35
18
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
21
Strength to Weight: Bending, points 23 to 47
20
Thermal Diffusivity, mm2/s 7.8
4.1
Thermal Shock Resistance, points 24 to 69
13

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.040 to 0.1
Chromium (Cr), % 3.5 to 4.0
17 to 19
Cobalt (Co), % 0
0 to 0.2
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
63.8 to 73.6
Manganese (Mn), % 0.15 to 0.4
0 to 2.0
Molybdenum (Mo), % 8.2 to 9.2
0
Nickel (Ni), % 0 to 0.3
9.0 to 13
Niobium (Nb), % 0
0.32 to 1.0
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.55
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0 to 0.1
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0