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SAE-AISI S7 Steel vs. ASTM Grade HT Steel

Both SAE-AISI S7 steel and ASTM grade HT steel are iron alloys. They have 50% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S7 steel and the bottom bar is ASTM grade HT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
500

Thermal Properties

Latent Heat of Fusion, J/g 260
310
Melting Completion (Liquidus), °C 1460
1390
Melting Onset (Solidus), °C 1420
1340
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
12
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
31
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.3
5.4
Embodied Energy, MJ/kg 31
76
Embodied Water, L/kg 65
190

Common Calculations

PREN (Pitting Resistance) 8.4
18
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24 to 72
18
Strength to Weight: Bending, points 22 to 46
18
Thermal Diffusivity, mm2/s 11
3.2
Thermal Shock Resistance, points 22 to 66
12

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.35 to 0.75
Chromium (Cr), % 3.0 to 3.5
15 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 94.9
38.2 to 51.7
Manganese (Mn), % 0.2 to 0.9
0 to 2.0
Molybdenum (Mo), % 1.3 to 1.8
0 to 0.5
Nickel (Ni), % 0
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 1.0
0 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0 to 0.3
0