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SAE-AISI 4340M Steel vs. SAE-AISI 1132 Steel

Both SAE-AISI 4340M steel and SAE-AISI 1132 steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is SAE-AISI 1132 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
190 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
14 to 18
Fatigue Strength, MPa 690
240 to 380
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 1360
400 to 440
Tensile Strength: Ultimate (UTS), MPa 2340
640 to 720
Tensile Strength: Yield (Proof), MPa 1240
350 to 590

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 430
400
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
51
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
1.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.4
Embodied Energy, MJ/kg 26
19
Embodied Water, L/kg 55
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
93 to 97
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
330 to 940
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
23 to 25
Strength to Weight: Bending, points 51
21 to 23
Thermal Diffusivity, mm2/s 10
14
Thermal Shock Resistance, points 70
19 to 22

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.24 to 0.34
Chromium (Cr), % 0.7 to 1.0
0
Iron (Fe), % 93.3 to 94.8
97.8 to 98.3
Manganese (Mn), % 0.65 to 0.9
1.4 to 1.7
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0
Sulfur (S), % 0 to 0.012
0.080 to 0.13
Vanadium (V), % 0.050 to 0.1
0