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Annealed SAE-AISI A7 vs. ASTM A387 Grade 9 Class 1

Both annealed SAE-AISI A7 and ASTM A387 grade 9 class 1 are iron alloys. Both are furnished in the annealed condition. They have a moderately high 92% 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 A7 and the bottom bar is ASTM A387 grade 9 class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Tensile Strength: Ultimate (UTS), MPa 800
500

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 37
26
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
6.5
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 13
2.1
Embodied Energy, MJ/kg 200
28
Embodied Water, L/kg 100
87

Common Calculations

PREN (Pitting Resistance) 11
12
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29
18
Strength to Weight: Bending, points 25
18
Thermal Diffusivity, mm2/s 10
6.9
Thermal Shock Resistance, points 27
14

Alloy Composition

Carbon (C), % 2.0 to 2.9
0 to 0.15
Chromium (Cr), % 5.0 to 5.8
8.0 to 10
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 87.7
87.1 to 90.8
Manganese (Mn), % 0 to 0.8
0.3 to 0.6
Molybdenum (Mo), % 0.9 to 1.4
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 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0 to 0.040