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ASTM A387 Grade 91 Class 2 vs. ASTM A204 Steel

Both ASTM A387 grade 91 class 2 and ASTM A204 steel are iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 91 class 2 and the bottom bar is ASTM A204 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
160 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
18 to 22
Fatigue Strength, MPa 330
200 to 220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 420
330 to 360
Tensile Strength: Ultimate (UTS), MPa 670
520 to 590
Tensile Strength: Yield (Proof), MPa 470
290 to 330

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 600
410
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420 to 1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
52
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 10
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
2.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.6
1.5
Embodied Energy, MJ/kg 37
20
Embodied Water, L/kg 88
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
90 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 580
220 to 290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
18 to 21
Strength to Weight: Bending, points 22
18 to 20
Thermal Diffusivity, mm2/s 6.9
14
Thermal Shock Resistance, points 19
15 to 17