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AISI 202 Stainless Steel vs. AISI 321 Stainless Steel

Both AISI 202 stainless steel and AISI 321 stainless steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is AISI 202 stainless steel and the bottom bar is AISI 321 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 14 to 45
34 to 50
Fatigue Strength, MPa 290 to 330
220 to 270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 490 to 590
420 to 460
Tensile Strength: Ultimate (UTS), MPa 700 to 980
590 to 690
Tensile Strength: Yield (Proof), MPa 310 to 580
220 to 350

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 410
480
Maximum Temperature: Mechanical, °C 910
870
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1360
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 13
16
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.8
3.2
Embodied Energy, MJ/kg 40
45
Embodied Water, L/kg 150
140

Common Calculations

PREN (Pitting Resistance) 20
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 260
190 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 250 to 840
130 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 35
21 to 25
Strength to Weight: Bending, points 23 to 29
20 to 22
Thermal Diffusivity, mm2/s 4.0
4.1
Thermal Shock Resistance, points 15 to 21
13 to 15

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 17 to 19
17 to 19
Iron (Fe), % 63.5 to 71.5
65.3 to 74
Manganese (Mn), % 7.5 to 10
0 to 2.0
Nickel (Ni), % 4.0 to 6.0
9.0 to 12
Nitrogen (N), % 0 to 0.25
0 to 0.1
Phosphorus (P), % 0 to 0.060
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.7