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SAE-AISI 1039 Steel vs. ASTM A372 Grade K Steel

Both SAE-AISI 1039 steel and ASTM A372 grade K steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1039 steel and the bottom bar is ASTM A372 grade K steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14 to 18
23
Fatigue Strength, MPa 230 to 370
440
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 380 to 420
490
Tensile Strength: Ultimate (UTS), MPa 610 to 690
780
Tensile Strength: Yield (Proof), MPa 340 to 580
620

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
440
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
48
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
4.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.8
Embodied Energy, MJ/kg 18
24
Embodied Water, L/kg 46
57

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 94
160
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 890
1010
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22 to 24
27
Strength to Weight: Bending, points 20 to 22
24
Thermal Diffusivity, mm2/s 14
13
Thermal Shock Resistance, points 19 to 22
23

Alloy Composition

Carbon (C), % 0.37 to 0.44
0 to 0.18
Chromium (Cr), % 0
1.0 to 1.8
Iron (Fe), % 98.5 to 98.9
93.4 to 96.6
Manganese (Mn), % 0.7 to 1.0
0.1 to 0.4
Molybdenum (Mo), % 0
0.2 to 0.6
Nickel (Ni), % 0
2.0 to 3.3
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.010