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ASTM A302 Alloy Steel vs. ASTM A372 Grade A Steel

Both ASTM A302 alloy steel and ASTM A372 grade A steel are iron alloys.

For each property being compared, the top bar is ASTM A302 alloy steel and the bottom bar is ASTM A372 grade A steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 190
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 23
22
Fatigue Strength, MPa 250 to 280
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 370 to 390
320
Tensile Strength: Ultimate (UTS), MPa 590 to 620
500
Tensile Strength: Yield (Proof), MPa 350 to 390
270

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39 to 51
52
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2 to 7.4
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2 to 8.4
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4 to 3.0
1.8
Density, g/cm3 7.8 to 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.5 to 1.6
1.4
Embodied Energy, MJ/kg 20 to 21
18
Embodied Water, L/kg 48 to 50
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
95
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 410
200
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21 to 22
18
Strength to Weight: Bending, points 20 to 21
18
Thermal Diffusivity, mm2/s 10 to 14
14
Thermal Shock Resistance, points 17 to 18
16