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SAE-AISI A7 Steel vs. AISI 439 Stainless Steel

Both SAE-AISI A7 steel and AISI 439 stainless steel are iron alloys. They have 86% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
490

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1470
1510
Melting Onset (Solidus), °C 1430
1430
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
25
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.0
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 13
2.3
Embodied Energy, MJ/kg 200
34
Embodied Water, L/kg 100
120

Common Calculations

PREN (Pitting Resistance) 11
18
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 77
18
Strength to Weight: Bending, points 25 to 48
18
Thermal Diffusivity, mm2/s 10
6.7
Thermal Shock Resistance, points 27 to 72
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 2.0 to 2.9
0 to 0.030
Chromium (Cr), % 5.0 to 5.8
17 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 87.7
77.1 to 82.8
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 to 0.5
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
0.2 to 1.1
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0