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SAE-AISI 4340M Steel vs. AISI 204 Stainless Steel

Both SAE-AISI 4340M steel and AISI 204 stainless steel are iron alloys. They have 77% 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 4340M steel and the bottom bar is AISI 204 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
210 to 330
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
23 to 39
Fatigue Strength, MPa 690
320 to 720
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Shear Strength, MPa 1360
500 to 700
Tensile Strength: Ultimate (UTS), MPa 2340
730 to 1100
Tensile Strength: Yield (Proof), MPa 1240
380 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
850
Melting Completion (Liquidus), °C 1440
1410
Melting Onset (Solidus), °C 1400
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
10
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.9
2.4
Embodied Energy, MJ/kg 26
35
Embodied Water, L/kg 55
130

Common Calculations

PREN (Pitting Resistance) 2.2
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
240 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
360 to 2940
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
27 to 40
Strength to Weight: Bending, points 51
24 to 31
Thermal Diffusivity, mm2/s 10
4.1
Thermal Shock Resistance, points 70
16 to 24

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 1.0
15 to 17
Iron (Fe), % 93.3 to 94.8
69.6 to 76.4
Manganese (Mn), % 0.65 to 0.9
7.0 to 9.0
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
1.5 to 3.0
Nitrogen (N), % 0
0.15 to 0.3
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0