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ASTM A356 Grade 6 vs. ASTM A372 Grade K Steel

Both ASTM A356 grade 6 and ASTM A372 grade K steel are iron alloys. They have a very high 97% 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 ASTM A356 grade 6 and the bottom bar is ASTM A372 grade K steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 25
23
Fatigue Strength, MPa 250
440
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 550
780
Tensile Strength: Yield (Proof), MPa 350
620

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
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 41
48
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
4.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.6
1.8
Embodied Energy, MJ/kg 21
24
Embodied Water, L/kg 53
57

Common Calculations

PREN (Pitting Resistance) 3.1
2.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
160
Resilience: Unit (Modulus of Resilience), kJ/m3 320
1010
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
27
Strength to Weight: Bending, points 19
24
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 16
23

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.18
Chromium (Cr), % 1.0 to 1.5
1.0 to 1.8
Iron (Fe), % 96.2 to 98.1
93.4 to 96.6
Manganese (Mn), % 0.5 to 0.8
0.1 to 0.4
Molybdenum (Mo), % 0.45 to 0.65
0.2 to 0.6
Nickel (Ni), % 0
2.0 to 3.3
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0 to 0.6
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.010