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ASTM A387 Grade 21 Steel vs. SAE-AISI T15 Steel

Both ASTM A387 grade 21 steel and SAE-AISI T15 steel are iron alloys. They have 75% 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 T15 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
76
Tensile Strength: Ultimate (UTS), MPa 500 to 590
830 to 2240

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1470
1690
Melting Onset (Solidus), °C 1430
1640
Specific Heat Capacity, J/kg-K 470
430
Thermal Conductivity, W/m-K 41
21
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
43
Density, g/cm3 7.9
8.7
Embodied Carbon, kg CO2/kg material 1.8
16
Embodied Energy, MJ/kg 23
250
Embodied Water, L/kg 62
140

Common Calculations

PREN (Pitting Resistance) 6.4
27
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 18 to 21
26 to 71
Strength to Weight: Bending, points 18 to 20
22 to 43
Thermal Diffusivity, mm2/s 11
5.6
Thermal Shock Resistance, points 14 to 17
26 to 70

Alloy Composition

Carbon (C), % 0.050 to 0.15
1.5 to 1.6
Chromium (Cr), % 2.8 to 3.3
3.8 to 5.0
Cobalt (Co), % 0
4.8 to 5.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.4 to 96
67.5 to 73.5
Manganese (Mn), % 0.3 to 0.6
0.15 to 0.4
Molybdenum (Mo), % 0.9 to 1.1
0 to 1.0
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.5
0.15 to 0.4
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0
11.8 to 13
Vanadium (V), % 0
4.5 to 5.3

Comparable Variants