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AISI 329 Stainless Steel vs. S17700 Stainless Steel

Both AISI 329 stainless steel and S17700 stainless steel are iron alloys. They have a moderately high 90% of their average alloy composition in common.

For each property being compared, the top bar is AISI 329 stainless steel and the bottom bar is S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
180 to 430
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
1.0 to 23
Fatigue Strength, MPa 330
290 to 560
Poisson's Ratio 0.27
0.28
Rockwell C Hardness 24
41 to 46
Shear Modulus, GPa 80
76
Shear Strength, MPa 440
740 to 940
Tensile Strength: Ultimate (UTS), MPa 710
1180 to 1650
Tensile Strength: Yield (Proof), MPa 540
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 450
410
Maximum Temperature: Mechanical, °C 1100
890
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 16
13
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.1
2.8
Embodied Energy, MJ/kg 44
40
Embodied Water, L/kg 170
150

Common Calculations

PREN (Pitting Resistance) 30
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 730
460 to 3750
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
42 to 59
Strength to Weight: Bending, points 23
32 to 40
Thermal Diffusivity, mm2/s 4.3
4.1
Thermal Shock Resistance, points 19
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), % 23 to 28
16 to 18
Iron (Fe), % 63.1 to 74
70.5 to 76.8
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 1.0 to 2.0
0
Nickel (Ni), % 2.0 to 5.0
6.5 to 7.8
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030