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ASTM A387 Grade 9 Steel vs. ASTM A387 Grade 11 Steel

Both ASTM A387 grade 9 steel and ASTM A387 grade 11 steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A387 grade 9 steel and the bottom bar is ASTM A387 grade 11 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 21
25
Fatigue Strength, MPa 160 to 240
200 to 250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 310 to 380
320 to 390
Tensile Strength: Ultimate (UTS), MPa 500 to 600
500 to 600
Tensile Strength: Yield (Proof), MPa 230 to 350
270 to 350

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 600
430
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 10
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
2.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.1
1.6
Embodied Energy, MJ/kg 28
21
Embodied Water, L/kg 87
53

Common Calculations

PREN (Pitting Resistance) 12
3.1
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
100 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
200 to 320
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18 to 21
18 to 21
Strength to Weight: Bending, points 18 to 20
18 to 20
Thermal Diffusivity, mm2/s 6.9
11
Thermal Shock Resistance, points 14 to 17
15 to 18

Alloy Composition

Carbon (C), % 0 to 0.15
0.050 to 0.17
Chromium (Cr), % 8.0 to 10
1.0 to 1.5
Iron (Fe), % 87.1 to 90.8
96.2 to 97.6
Manganese (Mn), % 0.3 to 0.6
0.4 to 0.65
Molybdenum (Mo), % 0.9 to 1.1
0.45 to 0.65
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 1.0
0.5 to 0.8
Sulfur (S), % 0 to 0.025
0 to 0.025
Vanadium (V), % 0 to 0.040
0

Comparable Variants