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ASTM A387 Grade 2 Steel vs. SAE-AISI 9255 Steel

Both ASTM A387 grade 2 steel and SAE-AISI 9255 steel are iron alloys. They have a very high 98% 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 ASTM A387 grade 2 steel and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 170
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 25
21
Fatigue Strength, MPa 190 to 250
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 300 to 350
430
Tensile Strength: Ultimate (UTS), MPa 470 to 550
680
Tensile Strength: Yield (Proof), MPa 260 to 350
390

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 420
400
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 45
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
2.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.6
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 50
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 16 to 20
24
Strength to Weight: Bending, points 17 to 19
22
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 14 to 16
21

Alloy Composition

Carbon (C), % 0.050 to 0.21
0.51 to 0.59
Chromium (Cr), % 0.5 to 0.8
0
Iron (Fe), % 97.1 to 98.3
96.2 to 97
Manganese (Mn), % 0.55 to 0.8
0.7 to 1.0
Molybdenum (Mo), % 0.45 to 0.6
0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0.15 to 0.4
1.8 to 2.2
Sulfur (S), % 0 to 0.025
0 to 0.040