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AISI 442 Stainless Steel vs. S21640 Stainless Steel

Both AISI 442 stainless steel and S21640 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 89% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is AISI 442 stainless steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
46
Fatigue Strength, MPa 210
320
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 78
78
Shear Strength, MPa 370
520
Tensile Strength: Ultimate (UTS), MPa 580
740
Tensile Strength: Yield (Proof), MPa 310
350

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
490
Maximum Temperature: Mechanical, °C 960
940
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 22
15
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 10
17
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.3
3.6
Embodied Energy, MJ/kg 32
51
Embodied Water, L/kg 130
150

Common Calculations

PREN (Pitting Resistance) 21
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
280
Resilience: Unit (Modulus of Resilience), kJ/m3 250
300
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
27
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 5.8
4.0
Thermal Shock Resistance, points 20
16

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.080
Chromium (Cr), % 18 to 23
17.5 to 19.5
Iron (Fe), % 74.1 to 82
63 to 74.3
Manganese (Mn), % 0 to 1.0
3.5 to 6.5
Molybdenum (Mo), % 0
0.5 to 2.0
Nickel (Ni), % 0 to 0.6
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030