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Annealed SAE-AISI H26 vs. ASTM A387 Grade 21 Class 1

Both annealed SAE-AISI H26 and ASTM A387 grade 21 class 1 are iron alloys. Both are furnished in the annealed condition. They have 79% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI H26 and the bottom bar is ASTM A387 grade 21 class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
150
Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
74
Tensile Strength: Ultimate (UTS), MPa 720
500

Thermal Properties

Latent Heat of Fusion, J/g 240
260
Melting Completion (Liquidus), °C 1810
1470
Melting Onset (Solidus), °C 1760
1430
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 22
41
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 45
4.1
Density, g/cm3 9.3
7.9
Embodied Carbon, kg CO2/kg material 8.1
1.8
Embodied Energy, MJ/kg 120
23
Embodied Water, L/kg 90
62

Common Calculations

PREN (Pitting Resistance) 34
6.4
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 22
18
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 5.6
11
Thermal Shock Resistance, points 22
14

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.050 to 0.15
Chromium (Cr), % 3.8 to 4.5
2.8 to 3.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 73.3 to 77.5
94.4 to 96
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.15 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 17.3 to 19
0
Vanadium (V), % 0.75 to 1.3
0