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SAE-AISI 81B45 Steel vs. ASTM Grade HT Steel

Both SAE-AISI 81B45 steel and ASTM grade HT steel are iron alloys. They have 47% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 81B45 steel and the bottom bar is ASTM grade HT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 200
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 24
4.6
Fatigue Strength, MPa 250 to 350
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 540 to 670
500
Tensile Strength: Yield (Proof), MPa 350 to 560
270

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 410
1010
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 7.2
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
31
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.5
5.4
Embodied Energy, MJ/kg 20
76
Embodied Water, L/kg 49
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 110
19
Resilience: Unit (Modulus of Resilience), kJ/m3 320 to 840
180
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19 to 24
18
Strength to Weight: Bending, points 19 to 22
18
Thermal Diffusivity, mm2/s 11
3.2
Thermal Shock Resistance, points 17 to 21
12

Alloy Composition

Boron (B), % 0.00050 to 0.0030
0
Carbon (C), % 0.43 to 0.48
0.35 to 0.75
Chromium (Cr), % 0.35 to 0.55
15 to 19
Iron (Fe), % 97 to 98
38.2 to 51.7
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.080 to 0.15
0 to 0.5
Nickel (Ni), % 0.2 to 0.4
33 to 37
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 2.5
Sulfur (S), % 0 to 0.040
0 to 0.040