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ASTM A387 Grade 21 Steel vs. SAE-AISI M47 Steel

Both ASTM A387 grade 21 steel and SAE-AISI M47 steel are iron alloys. They have 87% 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 ASTM A387 grade 21 steel and the bottom bar is SAE-AISI M47 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
77
Tensile Strength: Ultimate (UTS), MPa 500 to 590
810 to 2310

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1470
1540
Melting Onset (Solidus), °C 1430
1500
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 41
23
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
26
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 1.8
7.4
Embodied Energy, MJ/kg 23
100
Embodied Water, L/kg 62
120

Common Calculations

PREN (Pitting Resistance) 6.4
38
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
28 to 79
Strength to Weight: Bending, points 18 to 20
24 to 48
Thermal Diffusivity, mm2/s 11
6.3
Thermal Shock Resistance, points 14 to 17
27 to 77

Alloy Composition

Carbon (C), % 0.050 to 0.15
1.1 to 1.2
Chromium (Cr), % 2.8 to 3.3
3.5 to 4.0
Cobalt (Co), % 0
4.8 to 5.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.4 to 96
78.7 to 85
Manganese (Mn), % 0.3 to 0.6
0.15 to 0.4
Molybdenum (Mo), % 0.9 to 1.1
9.3 to 10
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.5
0.2 to 0.45
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0
1.3 to 1.8
Vanadium (V), % 0
1.2 to 1.4

Comparable Variants