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SAE-AISI 1144 Steel vs. SAE-AISI 1070 Steel

Both SAE-AISI 1144 steel and SAE-AISI 1070 steel are iron alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI 1144 steel and the bottom bar is SAE-AISI 1070 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
190 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
10 to 13
Fatigue Strength, MPa 280 to 430
270 to 350
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34 to 40
34 to 51
Shear Modulus, GPa 72
72
Shear Strength, MPa 460 to 510
380 to 460
Tensile Strength: Ultimate (UTS), MPa 750 to 840
640 to 760
Tensile Strength: Yield (Proof), MPa 420 to 690
420 to 560

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
50
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
12

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 47
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91 to 110
59 to 86
Resilience: Unit (Modulus of Resilience), kJ/m3 480 to 1290
470 to 850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 27 to 30
23 to 27
Strength to Weight: Bending, points 23 to 25
21 to 24
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 22 to 24
21 to 25

Alloy Composition

Carbon (C), % 0.4 to 0.48
0.65 to 0.75
Iron (Fe), % 97.5 to 98
98.3 to 98.8
Manganese (Mn), % 1.4 to 1.7
0.6 to 0.9
Phosphorus (P), % 0 to 0.040
0 to 0.040
Sulfur (S), % 0.24 to 0.33
0 to 0.050

Comparable Variants