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ASTM A302 Alloy Steel vs. ASTM Grade HP Steel

Both ASTM A302 alloy steel and ASTM grade HP steel are iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 190
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 23
5.1
Fatigue Strength, MPa 250 to 280
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 590 to 620
490
Tensile Strength: Yield (Proof), MPa 350 to 390
260

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1370
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39 to 51
12
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4 to 3.0
34
Density, g/cm3 7.8 to 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.5 to 1.6
5.8
Embodied Energy, MJ/kg 20 to 21
82
Embodied Water, L/kg 48 to 50
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
21
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 410
170
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 22
17
Strength to Weight: Bending, points 20 to 21
17
Thermal Diffusivity, mm2/s 10 to 14
3.2
Thermal Shock Resistance, points 17 to 18
11