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

Both ASTM grade HF steel and SAE-AISI 4340M steel are iron alloys. They have 72% 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 HF steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 29
6.0
Fatigue Strength, MPa 200
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 550
2340
Tensile Strength: Yield (Proof), MPa 270
1240

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Mechanical, °C 1000
430
Melting Completion (Liquidus), °C 1410
1440
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
38
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 17
3.9
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.2
1.9
Embodied Energy, MJ/kg 46
26
Embodied Water, L/kg 150
55

Common Calculations

PREN (Pitting Resistance) 21
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
120
Resilience: Unit (Modulus of Resilience), kJ/m3 180
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 20
84
Strength to Weight: Bending, points 19
51
Thermal Diffusivity, mm2/s 4.2
10
Thermal Shock Resistance, points 12
70

Alloy Composition

Carbon (C), % 0.2 to 0.4
0.38 to 0.43
Chromium (Cr), % 18 to 23
0.7 to 1.0
Iron (Fe), % 60 to 73.8
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), % 8.0 to 12
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