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ASTM Grade HP Steel vs. ACI-ASTM CN7MS Steel

Both ASTM grade HP steel and ACI-ASTM CN7MS steel are iron alloys. They have 81% of their average alloy composition in common.

For each property being compared, the top bar is ASTM grade HP steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 5.1
39
Fatigue Strength, MPa 130
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 490
540
Tensile Strength: Yield (Proof), MPa 260
230

Thermal Properties

Latent Heat of Fusion, J/g 320
340
Maximum Temperature: Corrosion, °C 440
420
Maximum Temperature: Mechanical, °C 1100
1040
Melting Completion (Liquidus), °C 1370
1400
Melting Onset (Solidus), °C 1330
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
12
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 34
28
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 5.8
5.1
Embodied Energy, MJ/kg 82
71
Embodied Water, L/kg 220
180

Common Calculations

PREN (Pitting Resistance) 27
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
170
Resilience: Unit (Modulus of Resilience), kJ/m3 170
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 17
19
Thermal Diffusivity, mm2/s 3.2
3.2
Thermal Shock Resistance, points 11
13

Alloy Composition

Carbon (C), % 0.35 to 0.75
0 to 0.070
Chromium (Cr), % 24 to 28
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 29.2 to 42.7
45.4 to 53.5
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
2.5 to 3.0
Nickel (Ni), % 33 to 37
22 to 25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.5
2.5 to 3.5
Sulfur (S), % 0 to 0.040
0 to 0.030