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SAE-AISI P20 Steel vs. ASTM Grade HP Steel

Both SAE-AISI P20 steel 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 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI P20 steel and the bottom bar is ASTM grade HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 540 to 1050
490

Thermal Properties

Latent Heat of Fusion, J/g 260
320
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 45
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
34
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.6
5.8
Embodied Energy, MJ/kg 21
82
Embodied Water, L/kg 52
220

Common Calculations

PREN (Pitting Resistance) 2.6
27
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 37
17
Strength to Weight: Bending, points 19 to 29
17
Thermal Diffusivity, mm2/s 12
3.2
Thermal Shock Resistance, points 18 to 35
11

Alloy Composition

Carbon (C), % 0.28 to 0.4
0.35 to 0.75
Chromium (Cr), % 0.4 to 2.0
24 to 28
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95.2 to 98.5
29.2 to 42.7
Manganese (Mn), % 0.35 to 0.71
0 to 2.0
Molybdenum (Mo), % 0.3 to 0.55
0 to 0.5
Nickel (Ni), % 0
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.8
0 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.040