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ASTM Grade HK Steel vs. SAE-AISI 4340M Steel

Both ASTM grade HK steel and SAE-AISI 4340M steel are iron alloys. They have 56% of their average alloy composition in common. There are 31 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 HK steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
6.0
Fatigue Strength, MPa 150
690
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
72
Tensile Strength: Ultimate (UTS), MPa 500
2340
Tensile Strength: Yield (Proof), MPa 270
1240

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
38
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 25
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.4
1.9
Embodied Energy, MJ/kg 63
26
Embodied Water, L/kg 200
55

Common Calculations

PREN (Pitting Resistance) 27
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 48
120
Resilience: Unit (Modulus of Resilience), kJ/m3 190
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
84
Strength to Weight: Bending, points 18
51
Thermal Diffusivity, mm2/s 3.9
10
Thermal Shock Resistance, points 11
70

Alloy Composition

Carbon (C), % 0.2 to 0.6
0.38 to 0.43
Chromium (Cr), % 24 to 28
0.7 to 1.0
Iron (Fe), % 44.8 to 57.8
93.3 to 94.8
Manganese (Mn), % 0 to 2.0
0.65 to 0.9
Molybdenum (Mo), % 0 to 0.5
0.35 to 0.45
Nickel (Ni), % 18 to 22
1.7 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.012
Silicon (Si), % 0 to 2.0
1.5 to 1.8
Sulfur (S), % 0 to 0.040
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1