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SAE-AISI 1140 Steel vs. AISI 439 Stainless Steel

Both SAE-AISI 1140 steel and AISI 439 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1140 steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 180
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14 to 18
23
Fatigue Strength, MPa 230 to 370
170
Poisson's Ratio 0.29
0.28
Reduction in Area, % 39 to 46
51
Shear Modulus, GPa 72
77
Shear Strength, MPa 370 to 420
310
Tensile Strength: Ultimate (UTS), MPa 600 to 700
490
Tensile Strength: Yield (Proof), MPa 340 to 570
250

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 400
890
Melting Completion (Liquidus), °C 1460
1510
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
25
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
2.3
Embodied Energy, MJ/kg 18
34
Embodied Water, L/kg 46
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
95
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 25
18
Strength to Weight: Bending, points 20 to 22
18
Thermal Diffusivity, mm2/s 14
6.7
Thermal Shock Resistance, points 18 to 21
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0.37 to 0.44
0 to 0.030
Chromium (Cr), % 0
17 to 19
Iron (Fe), % 98.4 to 98.9
77.1 to 82.8
Manganese (Mn), % 0.7 to 1.0
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0.080 to 0.13
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.1