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S35140 Stainless Steel vs. S40945 Stainless Steel

Both S35140 stainless steel and S40945 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 61% of their average alloy composition in common.

For each property being compared, the top bar is S35140 stainless steel and the bottom bar is S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
160
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
25
Fatigue Strength, MPa 250
160
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 88
69
Shear Modulus, GPa 78
75
Shear Strength, MPa 460
270
Tensile Strength: Ultimate (UTS), MPa 690
430
Tensile Strength: Yield (Proof), MPa 310
230

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 500
450
Maximum Temperature: Mechanical, °C 1100
710
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1370
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 14
26
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 31
8.0
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.5
2.2
Embodied Energy, MJ/kg 78
31
Embodied Water, L/kg 190
94

Common Calculations

PREN (Pitting Resistance) 28
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
89
Resilience: Unit (Modulus of Resilience), kJ/m3 250
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24
15
Strength to Weight: Bending, points 22
16
Thermal Diffusivity, mm2/s 3.7
6.9
Thermal Shock Resistance, points 16
15

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 20 to 22
10.5 to 11.7
Iron (Fe), % 44.1 to 52.7
85.1 to 89.3
Manganese (Mn), % 1.0 to 3.0
0 to 1.0
Molybdenum (Mo), % 1.0 to 2.0
0
Nickel (Ni), % 25 to 27
0 to 0.5
Niobium (Nb), % 0.25 to 0.75
0.18 to 0.4
Nitrogen (N), % 0.080 to 0.2
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
0.050 to 0.2