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EN 1.4640 Stainless Steel vs. ASTM A387 Grade 9 Steel

Both EN 1.4640 stainless steel and ASTM A387 grade 9 steel are iron alloys. They have 80% of their average alloy composition in common. There are 32 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 EN 1.4640 stainless steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 200
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 51
20 to 21
Fatigue Strength, MPa 230 to 250
160 to 240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Shear Strength, MPa 440 to 460
310 to 380
Tensile Strength: Ultimate (UTS), MPa 620 to 650
500 to 600
Tensile Strength: Yield (Proof), MPa 240 to 260
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 930
600
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
26
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
10

Otherwise Unclassified Properties

Base Metal Price, % relative 14
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
2.1
Embodied Energy, MJ/kg 40
28
Embodied Water, L/kg 150
87

Common Calculations

PREN (Pitting Resistance) 20
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250 to 260
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 170
140 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22 to 23
18 to 21
Strength to Weight: Bending, points 21
18 to 20
Thermal Diffusivity, mm2/s 4.0
6.9
Thermal Shock Resistance, points 14 to 15
14 to 17

Alloy Composition

Carbon (C), % 0.030 to 0.080
0 to 0.15
Chromium (Cr), % 18 to 19
8.0 to 10
Copper (Cu), % 1.3 to 2.0
0
Iron (Fe), % 67.4 to 73.6
87.1 to 90.8
Manganese (Mn), % 1.5 to 4.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 5.5 to 6.9
0
Nitrogen (N), % 0.030 to 0.11
0
Phosphorus (P), % 0 to 0.045
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.025
Vanadium (V), % 0
0 to 0.040