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ASTM A356 Grade 8 vs. ASTM Grade HP Steel

Both ASTM A356 grade 8 and ASTM grade HP steel are iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ASTM A356 grade 8 and the bottom bar is ASTM grade HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
5.1
Fatigue Strength, MPa 270
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 630
490
Tensile Strength: Yield (Proof), MPa 390
260

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Maximum Temperature: Mechanical, °C 440
1100
Melting Completion (Liquidus), °C 1470
1370
Melting Onset (Solidus), °C 1430
1330
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 38
12
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
34
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.0
5.8
Embodied Energy, MJ/kg 26
82
Embodied Water, L/kg 55
220

Common Calculations

PREN (Pitting Resistance) 4.7
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
21
Resilience: Unit (Modulus of Resilience), kJ/m3 390
170
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
17
Strength to Weight: Bending, points 21
17
Thermal Diffusivity, mm2/s 10
3.2
Thermal Shock Resistance, points 18
11

Alloy Composition

Carbon (C), % 0 to 0.2
0.35 to 0.75
Chromium (Cr), % 1.0 to 1.5
24 to 28
Iron (Fe), % 95.4 to 97.4
29.2 to 42.7
Manganese (Mn), % 0.5 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.9 to 1.2
0 to 0.5
Nickel (Ni), % 0
33 to 37
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.2 to 0.6
0 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0.050 to 0.15
0