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AWS E308H vs. ASTM A387 Grade 12 Steel

Both AWS E308H and ASTM A387 grade 12 steel are iron alloys. They have 70% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AWS E308H and the bottom bar is ASTM A387 grade 12 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
25
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 620
470 to 520

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
44
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 16
2.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.2
1.6
Embodied Energy, MJ/kg 46
21
Embodied Water, L/kg 150
51

Common Calculations

PREN (Pitting Resistance) 21
2.7
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
16 to 18
Strength to Weight: Bending, points 21
17 to 18
Thermal Diffusivity, mm2/s 4.2
12
Thermal Shock Resistance, points 16
14 to 15

Alloy Composition

Carbon (C), % 0.040 to 0.080
0.050 to 0.17
Chromium (Cr), % 18 to 21
0.8 to 1.2
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 62.9 to 72.5
97 to 98.2
Manganese (Mn), % 0.5 to 2.5
0.4 to 0.65
Molybdenum (Mo), % 0 to 0.75
0.45 to 0.6
Nickel (Ni), % 9.0 to 11
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0.15 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.025