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

Both SAE-AISI 4340M steel and ASTM grade HK 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 SAE-AISI 4340M steel and the bottom bar is ASTM grade HK steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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