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AISI 309H Stainless Steel vs. S40975 Stainless Steel

Both AISI 309H stainless steel and S40975 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 75% of their average alloy composition in common. There are 34 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 309H stainless steel and the bottom bar is S40975 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
170
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
22
Fatigue Strength, MPa 200
210
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 82
81
Shear Modulus, GPa 78
75
Shear Strength, MPa 400
290
Tensile Strength: Ultimate (UTS), MPa 580
460
Tensile Strength: Yield (Proof), MPa 230
310

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 440
450
Maximum Temperature: Mechanical, °C 1080
710
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
26
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 19
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
2.0
Embodied Energy, MJ/kg 51
28
Embodied Water, L/kg 170
95

Common Calculations

PREN (Pitting Resistance) 23
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
93
Resilience: Unit (Modulus of Resilience), kJ/m3 130
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
17
Strength to Weight: Bending, points 20
17
Thermal Diffusivity, mm2/s 4.0
7.0
Thermal Shock Resistance, points 13
17

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.030
Chromium (Cr), % 22 to 24
10.5 to 11.7
Iron (Fe), % 58.1 to 66
84.4 to 89
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 12 to 15
0.5 to 1.0
Nitrogen (N), % 0
0 to 0.030
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
0 to 0.75