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S21800 Stainless Steel vs. S40945 Stainless Steel

Both S21800 stainless steel and S40945 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 75% of their average alloy composition in common. There are 30 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 S21800 stainless steel and the bottom bar is S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
25
Fatigue Strength, MPa 330
160
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 88
69
Shear Modulus, GPa 75
75
Shear Strength, MPa 510
270
Tensile Strength: Ultimate (UTS), MPa 740
430
Tensile Strength: Yield (Proof), MPa 390
230

Thermal Properties

Latent Heat of Fusion, J/g 340
270
Maximum Temperature: Corrosion, °C 410
450
Maximum Temperature: Mechanical, °C 900
710
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1310
1410
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 15
8.0
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 3.1
2.2
Embodied Energy, MJ/kg 45
31
Embodied Water, L/kg 150
94

Common Calculations

PREN (Pitting Resistance) 19
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
89
Resilience: Unit (Modulus of Resilience), kJ/m3 390
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
15
Strength to Weight: Bending, points 24
16
Thermal Shock Resistance, points 17
15

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 16 to 18
10.5 to 11.7
Iron (Fe), % 59.1 to 65.4
85.1 to 89.3
Manganese (Mn), % 7.0 to 9.0
0 to 1.0
Nickel (Ni), % 8.0 to 9.0
0 to 0.5
Niobium (Nb), % 0
0.18 to 0.4
Nitrogen (N), % 0.080 to 0.18
0 to 0.030
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.050 to 0.2