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SAE-AISI A7 Steel vs. S40975 Stainless Steel

Both SAE-AISI A7 steel and S40975 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is S40975 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
460

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
26
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 10
6.5
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 13
2.0
Embodied Energy, MJ/kg 200
28
Embodied Water, L/kg 100
95

Common Calculations

PREN (Pitting Resistance) 11
11
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 77
17
Strength to Weight: Bending, points 25 to 48
17
Thermal Diffusivity, mm2/s 10
7.0
Thermal Shock Resistance, points 27 to 72
17

Alloy Composition

Carbon (C), % 2.0 to 2.9
0 to 0.030
Chromium (Cr), % 5.0 to 5.8
10.5 to 11.7
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 87.7
84.4 to 89
Manganese (Mn), % 0 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0.5 to 1.0
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.75
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0