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ASTM A387 Grade 12 Steel vs. AISI 347 Stainless Steel

Both ASTM A387 grade 12 steel and AISI 347 stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, 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 347 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 160
160 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 25
34 to 46
Fatigue Strength, MPa 190 to 230
220 to 270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 300 to 330
430 to 460
Tensile Strength: Ultimate (UTS), MPa 470 to 520
610 to 690
Tensile Strength: Yield (Proof), MPa 260 to 310
240 to 350

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 430
870
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
16
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.6
3.6
Embodied Energy, MJ/kg 21
52
Embodied Water, L/kg 51
150

Common Calculations

PREN (Pitting Resistance) 2.7
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 110
190 to 220
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 250
150 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 16 to 18
22 to 25
Strength to Weight: Bending, points 17 to 18
20 to 22
Thermal Diffusivity, mm2/s 12
4.3
Thermal Shock Resistance, points 14 to 15
13 to 15

Alloy Composition

Carbon (C), % 0.050 to 0.17
0 to 0.080
Chromium (Cr), % 0.8 to 1.2
17 to 19
Iron (Fe), % 97 to 98.2
64.1 to 74
Manganese (Mn), % 0.4 to 0.65
0 to 2.0
Molybdenum (Mo), % 0.45 to 0.6
0
Nickel (Ni), % 0
9.0 to 13
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0.15 to 0.4
0 to 0.75
Sulfur (S), % 0 to 0.025
0 to 0.030