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SAE-AISI 6150 Steel vs. ASTM A387 Grade 21 Steel

Both SAE-AISI 6150 steel and ASTM A387 grade 21 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 6150 steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 350
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 15 to 23
21
Fatigue Strength, MPa 300 to 750
160 to 250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Shear Strength, MPa 400 to 730
310 to 370
Tensile Strength: Ultimate (UTS), MPa 630 to 1200
500 to 590
Tensile Strength: Yield (Proof), MPa 420 to 1160
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 420
480
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 46
41
Thermal Expansion, µm/m-K 12 to 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
4.1
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.0
1.8
Embodied Energy, MJ/kg 28
23
Embodied Water, L/kg 51
62

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 180
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 3590
140 to 320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22 to 43
18 to 21
Strength to Weight: Bending, points 21 to 32
18 to 20
Thermal Diffusivity, mm2/s 13
11
Thermal Shock Resistance, points 20 to 38
14 to 17

Alloy Composition

Carbon (C), % 0.48 to 0.53
0.050 to 0.15
Chromium (Cr), % 0.8 to 1.1
2.8 to 3.3
Iron (Fe), % 96.7 to 97.7
94.4 to 96
Manganese (Mn), % 0.7 to 0.9
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025
Vanadium (V), % 0.15 to 0.3
0

Comparable Variants