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ASTM Grade HH Steel vs. ASTM A372 Grade M Steel

Both ASTM grade HH steel and ASTM A372 grade M steel are iron alloys. They have 65% 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 grade HH steel and the bottom bar is ASTM A372 grade M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
240 to 280
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
18 to 21
Fatigue Strength, MPa 150
450 to 520
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
73
Tensile Strength: Ultimate (UTS), MPa 580
810 to 910
Tensile Strength: Yield (Proof), MPa 270
660 to 770

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1100
450
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1360
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
46
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 20
5.0
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 3.7
2.0
Embodied Energy, MJ/kg 53
27
Embodied Water, L/kg 180
61

Common Calculations

PREN (Pitting Resistance) 27
3.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 53
160
Resilience: Unit (Modulus of Resilience), kJ/m3 190
1140 to 1580
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
29 to 32
Strength to Weight: Bending, points 20
24 to 27
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 12
24 to 27

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.23
Chromium (Cr), % 24 to 28
1.5 to 2.0
Iron (Fe), % 52.9 to 64.8
92.5 to 95.1
Manganese (Mn), % 0 to 2.0
0.2 to 0.4
Molybdenum (Mo), % 0 to 0.5
0.4 to 0.6
Nickel (Ni), % 11 to 14
2.8 to 3.9
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 2.0
0 to 0.3
Sulfur (S), % 0 to 0.040
0 to 0.010
Vanadium (V), % 0
0 to 0.080