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ASTM Grade HP Steel vs. SAE-AISI 4140 Steel

Both ASTM grade HP steel and SAE-AISI 4140 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 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 grade HP steel and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
200 to 310
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 5.1
11 to 26
Fatigue Strength, MPa 130
360 to 650
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 490
690 to 1080
Tensile Strength: Yield (Proof), MPa 260
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1370
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
43
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 34
2.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 5.8
1.5
Embodied Energy, MJ/kg 82
20
Embodied Water, L/kg 220
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 170
920 to 2590
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
25 to 38
Strength to Weight: Bending, points 17
22 to 30
Thermal Diffusivity, mm2/s 3.2
12
Thermal Shock Resistance, points 11
20 to 32

Alloy Composition

Carbon (C), % 0.35 to 0.75
0.38 to 0.43
Chromium (Cr), % 24 to 28
0.8 to 1.1
Iron (Fe), % 29.2 to 42.7
96.8 to 97.8
Manganese (Mn), % 0 to 2.0
0.75 to 1.0
Molybdenum (Mo), % 0 to 0.5
0.15 to 0.25
Nickel (Ni), % 33 to 37
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 2.5
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040