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AISI 321 Stainless Steel vs. S17700 Stainless Steel

Both AISI 321 stainless steel and S17700 stainless steel are iron alloys. They have a moderately high 95% 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 321 stainless steel and the bottom bar is S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
180 to 430
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34 to 50
1.0 to 23
Fatigue Strength, MPa 220 to 270
290 to 560
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Shear Strength, MPa 420 to 460
740 to 940
Tensile Strength: Ultimate (UTS), MPa 590 to 690
1180 to 1650
Tensile Strength: Yield (Proof), MPa 220 to 350
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 480
410
Maximum Temperature: Mechanical, °C 870
890
Melting Completion (Liquidus), °C 1430
1440
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.7

Otherwise Unclassified Properties

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

Common Calculations

PREN (Pitting Resistance) 19
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 230
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 310
460 to 3750
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
42 to 59
Strength to Weight: Bending, points 20 to 22
32 to 40
Thermal Diffusivity, mm2/s 4.1
4.1
Thermal Shock Resistance, points 13 to 15
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0 to 0.080
0 to 0.090
Chromium (Cr), % 17 to 19
16 to 18
Iron (Fe), % 65.3 to 74
70.5 to 76.8
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 9.0 to 12
6.5 to 7.8
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0 to 0.7
0