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ASTM A387 Grade 12 Steel vs. ASTM A387 Grade 22 Steel

Both ASTM A387 grade 12 steel and ASTM A387 grade 22 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A387 grade 12 steel and the bottom bar is ASTM A387 grade 22 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 160
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 25
21
Fatigue Strength, MPa 190 to 230
160 to 240
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Shear Strength, MPa 300 to 330
300 to 380
Tensile Strength: Ultimate (UTS), MPa 470 to 520
480 to 600
Tensile Strength: Yield (Proof), MPa 260 to 310
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 430
460
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
3.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.6
1.7
Embodied Energy, MJ/kg 21
23
Embodied Water, L/kg 51
58

Common Calculations

PREN (Pitting Resistance) 2.7
5.6
Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 110
85 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 250
140 to 320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 16 to 18
17 to 21
Strength to Weight: Bending, points 17 to 18
17 to 20
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 14 to 15
14 to 17

Alloy Composition

Carbon (C), % 0.050 to 0.17
0.050 to 0.15
Chromium (Cr), % 0.8 to 1.2
2.0 to 2.5
Iron (Fe), % 97 to 98.2
95.1 to 96.8
Manganese (Mn), % 0.4 to 0.65
0.3 to 0.6
Molybdenum (Mo), % 0.45 to 0.6
0.9 to 1.1
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0.15 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.025

Comparable Variants