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ASTM A372 Grade M Steel vs. ASTM Grade HC Steel

Both ASTM A372 grade M steel and ASTM grade HC steel are iron alloys. They have 73% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A372 grade M steel and the bottom bar is ASTM grade HC steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 18 to 21
6.0
Fatigue Strength, MPa 450 to 520
96
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 810 to 910
430
Tensile Strength: Yield (Proof), MPa 660 to 770
200

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 450
1100
Melting Completion (Liquidus), °C 1460
1410
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 46
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
14
Density, g/cm3 7.9
7.6
Embodied Carbon, kg CO2/kg material 2.0
2.8
Embodied Energy, MJ/kg 27
40
Embodied Water, L/kg 61
170

Common Calculations

PREN (Pitting Resistance) 3.4
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
21
Resilience: Unit (Modulus of Resilience), kJ/m3 1140 to 1580
95
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 29 to 32
16
Strength to Weight: Bending, points 24 to 27
16
Thermal Diffusivity, mm2/s 12
4.5
Thermal Shock Resistance, points 24 to 27
14

Alloy Composition

Carbon (C), % 0 to 0.23
0 to 0.5
Chromium (Cr), % 1.5 to 2.0
26 to 30
Iron (Fe), % 92.5 to 95.1
61.9 to 74
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.4 to 0.6
0 to 0.5
Nickel (Ni), % 2.8 to 3.9
0 to 4.0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.3
0 to 2.0
Sulfur (S), % 0 to 0.010
0 to 0.040
Vanadium (V), % 0 to 0.080
0