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ASTM Grade HG10 MNN Steel vs. ASTM Grade HI Steel

Both ASTM grade HG10 MNN steel and ASTM grade HI steel are iron alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 87% of their average alloy composition in common.

For each property being compared, the top bar is ASTM grade HG10 MNN steel and the bottom bar is ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
11
Fatigue Strength, MPa 170
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 590
550
Tensile Strength: Yield (Proof), MPa 250
270

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Maximum Temperature: Corrosion, °C 500
450
Maximum Temperature: Mechanical, °C 990
1100
Melting Completion (Liquidus), °C 1420
1400
Melting Onset (Solidus), °C 1370
1350
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 21
23
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.0
4.1
Embodied Energy, MJ/kg 58
59
Embodied Water, L/kg 160
200

Common Calculations

PREN (Pitting Resistance) 25
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
52
Resilience: Unit (Modulus of Resilience), kJ/m3 160
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
20
Strength to Weight: Bending, points 20
19
Thermal Diffusivity, mm2/s 3.9
3.9
Thermal Shock Resistance, points 13
12

Alloy Composition

Carbon (C), % 0.070 to 0.11
0.2 to 0.5
Chromium (Cr), % 18.5 to 20.5
26 to 30
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 57.9 to 66.5
46.9 to 59.8
Manganese (Mn), % 3.0 to 5.0
0 to 2.0
Molybdenum (Mo), % 0.25 to 0.45
0 to 0.5
Nickel (Ni), % 11.5 to 13.5
14 to 18
Niobium (Nb), % 0.2 to 1.0
0
Nitrogen (N), % 0.2 to 0.3
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.7
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040