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ASTM A302 Alloy Steel vs. ASTM Grade HF Steel

Both ASTM A302 alloy steel and ASTM grade HF steel are iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 190
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 23
29
Fatigue Strength, MPa 250 to 280
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 590 to 620
550
Tensile Strength: Yield (Proof), MPa 350 to 390
270

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
1000
Melting Completion (Liquidus), °C 1460
1410
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39 to 51
16
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2 to 7.4
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2 to 8.4
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4 to 3.0
17
Density, g/cm3 7.8 to 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.5 to 1.6
3.2
Embodied Energy, MJ/kg 20 to 21
46
Embodied Water, L/kg 48 to 50
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
130
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 410
180
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 22
20
Strength to Weight: Bending, points 20 to 21
19
Thermal Diffusivity, mm2/s 10 to 14
4.2
Thermal Shock Resistance, points 17 to 18
12