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ASTM A372 Grade G Steel vs. ASTM Grade HP Steel

Both ASTM A372 grade G steel and ASTM grade HP steel are iron alloys. They have a modest 38% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 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 A372 grade G steel and the bottom bar is ASTM grade HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 280
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 22
5.1
Fatigue Strength, MPa 310 to 380
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 650 to 910
490
Tensile Strength: Yield (Proof), MPa 430 to 550
260

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1370
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
12
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
34
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
5.8
Embodied Energy, MJ/kg 20
82
Embodied Water, L/kg 49
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 160
21
Resilience: Unit (Modulus of Resilience), kJ/m3 500 to 810
170
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23 to 32
17
Strength to Weight: Bending, points 21 to 27
17
Thermal Diffusivity, mm2/s 13
3.2
Thermal Shock Resistance, points 19 to 27
11

Alloy Composition

Carbon (C), % 0.25 to 0.35
0.35 to 0.75
Chromium (Cr), % 0.4 to 0.65
24 to 28
Iron (Fe), % 97.4 to 98.4
29.2 to 42.7
Manganese (Mn), % 0.7 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
0 to 0.5
Nickel (Ni), % 0
33 to 37
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 2.5
Sulfur (S), % 0 to 0.010
0 to 0.040