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ACI-ASTM CN7M Steel vs. ASTM Grade HI Steel

Both ACI-ASTM CN7M steel and ASTM grade HI steel are iron alloys. They have 81% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CN7M steel and the bottom bar is ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 44
11
Fatigue Strength, MPa 190
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 480
550
Tensile Strength: Yield (Proof), MPa 200
270

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Maximum Temperature: Corrosion, °C 430
450
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1450
1350
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 15
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 32
23
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 5.6
4.1
Embodied Energy, MJ/kg 78
59
Embodied Water, L/kg 210
200

Common Calculations

PREN (Pitting Resistance) 29
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
52
Resilience: Unit (Modulus of Resilience), kJ/m3 110
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
20
Strength to Weight: Bending, points 17
19
Thermal Diffusivity, mm2/s 5.6
3.9
Thermal Shock Resistance, points 12
12

Alloy Composition

Carbon (C), % 0 to 0.070
0.2 to 0.5
Chromium (Cr), % 19 to 22
26 to 30
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
46.9 to 59.8
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 2.0 to 3.0
0 to 0.5
Nickel (Ni), % 27.5 to 30.5
14 to 18
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 2.0
Sulfur (S), % 0 to 0.040
0 to 0.040