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SAE-AISI M6 Steel vs. ASTM A369 Grade FP21

Both SAE-AISI M6 steel and ASTM A369 grade FP21 are iron alloys. They have 76% of their average alloy composition in common. There are 22 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 SAE-AISI M6 steel and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
74
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
470

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1560
1470
Melting Onset (Solidus), °C 1510
1430
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 17
41
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 39
4.0
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.8
Embodied Energy, MJ/kg 120
23
Embodied Water, L/kg 160
61

Common Calculations

PREN (Pitting Resistance) 28
6.2
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28 to 73
17
Strength to Weight: Bending, points 24 to 45
17
Thermal Diffusivity, mm2/s 4.7
11
Thermal Shock Resistance, points 26 to 68
14

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.050 to 0.15
Chromium (Cr), % 3.8 to 4.5
2.7 to 3.4
Cobalt (Co), % 11 to 13
0
Iron (Fe), % 68.8 to 74.6
94.3 to 96.2
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 4.5 to 5.5
0.8 to 1.1
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 0.45
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 3.8 to 4.8
0
Vanadium (V), % 1.3 to 1.7
0