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ASTM Grade HP Steel vs. SAE-AISI 4340 Steel

Both ASTM grade HP steel and SAE-AISI 4340 steel are iron alloys. They have 40% of their average alloy composition in common. 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 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 5.1
12 to 22
Fatigue Strength, MPa 130
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 490
690 to 1280
Tensile Strength: Yield (Proof), MPa 260
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Maximum Temperature: Mechanical, °C 1100
430
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
44
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 34
3.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 5.8
1.7
Embodied Energy, MJ/kg 82
22
Embodied Water, L/kg 220
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 170
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
24 to 45
Strength to Weight: Bending, points 17
22 to 33
Thermal Diffusivity, mm2/s 3.2
12
Thermal Shock Resistance, points 11
20 to 38

Alloy Composition

Carbon (C), % 0.35 to 0.75
0.38 to 0.43
Chromium (Cr), % 24 to 28
0.7 to 0.9
Iron (Fe), % 29.2 to 42.7
95.1 to 96.3
Manganese (Mn), % 0 to 2.0
0.6 to 0.8
Molybdenum (Mo), % 0 to 0.5
0.2 to 0.3
Nickel (Ni), % 33 to 37
1.7 to 2.0
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