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ASTM A387 Grade 12 Steel vs. AISI 439 Stainless Steel

Both ASTM A387 grade 12 steel and AISI 439 stainless steel are iron alloys. They have 82% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 12 steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 160
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 25
23
Fatigue Strength, MPa 190 to 230
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 300 to 330
310
Tensile Strength: Ultimate (UTS), MPa 470 to 520
490
Tensile Strength: Yield (Proof), MPa 260 to 310
250

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 430
890
Melting Completion (Liquidus), °C 1470
1510
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
25
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.6
2.3
Embodied Energy, MJ/kg 21
34
Embodied Water, L/kg 51
120

Common Calculations

PREN (Pitting Resistance) 2.7
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 110
95
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 250
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 16 to 18
18
Strength to Weight: Bending, points 17 to 18
18
Thermal Diffusivity, mm2/s 12
6.7
Thermal Shock Resistance, points 14 to 15
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0.050 to 0.17
0 to 0.030
Chromium (Cr), % 0.8 to 1.2
17 to 19
Iron (Fe), % 97 to 98.2
77.1 to 82.8
Manganese (Mn), % 0.4 to 0.65
0 to 1.0
Molybdenum (Mo), % 0.45 to 0.6
0
Nickel (Ni), % 0
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0.15 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.1