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Cold Drawn SAE-AISI 1137 vs. Cold Finished SAE-AISI 4140

Both cold drawn SAE-AISI 1137 and cold finished SAE-AISI 4140 are iron alloys. Both are furnished in the cold worked (strain hardened) condition. They have a very high 99% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is cold drawn SAE-AISI 1137 and the bottom bar is cold finished SAE-AISI 4140.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
11
Fatigue Strength, MPa 400
360
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 460
410
Tensile Strength: Ultimate (UTS), MPa 760
690
Tensile Strength: Yield (Proof), MPa 650
590

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
43
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 12
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 48
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 81
74
Resilience: Unit (Modulus of Resilience), kJ/m3 1130
920
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 27
25
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 23
20

Alloy Composition

Carbon (C), % 0.32 to 0.39
0.38 to 0.43
Chromium (Cr), % 0
0.8 to 1.1
Iron (Fe), % 97.8 to 98.3
96.8 to 97.8
Manganese (Mn), % 1.4 to 1.7
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0.080 to 0.13
0 to 0.040