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SAE-AISI 9255 Steel vs. AISI 304N Stainless Steel

Both SAE-AISI 9255 steel and AISI 304N stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is AISI 304N stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
190 to 360
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
9.1 to 45
Fatigue Strength, MPa 270
220 to 440
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Shear Strength, MPa 430
420 to 700
Tensile Strength: Ultimate (UTS), MPa 680
620 to 1180
Tensile Strength: Yield (Proof), MPa 390
270 to 850

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 400
960
Melting Completion (Liquidus), °C 1430
1420
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 46
16
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
15
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.0
Embodied Energy, MJ/kg 20
43
Embodied Water, L/kg 46
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
98 to 280
Resilience: Unit (Modulus of Resilience), kJ/m3 400
180 to 1830
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
22 to 42
Strength to Weight: Bending, points 22
21 to 32
Thermal Diffusivity, mm2/s 13
4.2
Thermal Shock Resistance, points 21
14 to 26

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.080
Chromium (Cr), % 0
18 to 20
Iron (Fe), % 96.2 to 97
66.4 to 73.9
Manganese (Mn), % 0.7 to 1.0
0 to 2.0
Nickel (Ni), % 0
8.0 to 10.5
Nitrogen (N), % 0
0.1 to 0.16
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 1.8 to 2.2
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030