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ASTM Grade HN Steel vs. SAE-AISI 4340 Steel

Both ASTM grade HN steel and SAE-AISI 4340 steel are iron alloys. They have 56% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HN 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, % 9.0
12 to 22
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 500
690 to 1280

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1080
430
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 13
44
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 26
3.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.6
1.7
Embodied Energy, MJ/kg 66
22
Embodied Water, L/kg 180
53

Common Calculations

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 18
22 to 33
Thermal Diffusivity, mm2/s 3.5
12
Thermal Shock Resistance, points 11
20 to 38

Alloy Composition

Carbon (C), % 0.2 to 0.5
0.38 to 0.43
Chromium (Cr), % 19 to 23
0.7 to 0.9
Iron (Fe), % 44.9 to 57.8
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), % 23 to 27
1.7 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040