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ASTM A387 Grade 22 Steel vs. ASTM A387 Grade 91 Class 2

Both ASTM A387 grade 22 steel and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 93% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A387 grade 22 steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
20
Fatigue Strength, MPa 160 to 240
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
75
Shear Strength, MPa 300 to 380
420
Tensile Strength: Ultimate (UTS), MPa 480 to 600
670
Tensile Strength: Yield (Proof), MPa 230 to 350
470

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 460
600
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
10

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
7.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.7
2.6
Embodied Energy, MJ/kg 23
37
Embodied Water, L/kg 58
88

Common Calculations

PREN (Pitting Resistance) 5.6
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 85 to 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17 to 21
24
Strength to Weight: Bending, points 17 to 20
22
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 14 to 17
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0.050 to 0.15
0.080 to 0.12
Chromium (Cr), % 2.0 to 2.5
8.0 to 9.5
Iron (Fe), % 95.1 to 96.8
87.3 to 90.3
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.9 to 1.1
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.5
0.2 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010