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S21800 Stainless Steel vs. SAE-AISI 9255 Steel

Both S21800 stainless steel and SAE-AISI 9255 steel are iron alloys. Both are furnished in the annealed condition. They have 65% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
21
Fatigue Strength, MPa 330
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
72
Shear Strength, MPa 510
430
Tensile Strength: Ultimate (UTS), MPa 740
680
Tensile Strength: Yield (Proof), MPa 390
390

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Mechanical, °C 900
400
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1310
1390
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.0
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 3.1
1.5
Embodied Energy, MJ/kg 45
20
Embodied Water, L/kg 150
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
120
Resilience: Unit (Modulus of Resilience), kJ/m3 390
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
24
Strength to Weight: Bending, points 24
22
Thermal Shock Resistance, points 17
21

Alloy Composition

Carbon (C), % 0 to 0.1
0.51 to 0.59
Chromium (Cr), % 16 to 18
0
Iron (Fe), % 59.1 to 65.4
96.2 to 97
Manganese (Mn), % 7.0 to 9.0
0.7 to 1.0
Nickel (Ni), % 8.0 to 9.0
0
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.035
Silicon (Si), % 3.5 to 4.5
1.8 to 2.2
Sulfur (S), % 0 to 0.030
0 to 0.040