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EN 1.4958 Stainless Steel vs. ASTM A387 Grade 9 Steel

Both EN 1.4958 stainless steel and ASTM A387 grade 9 steel are iron alloys. They have 56% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.4958 stainless steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
20 to 21
Fatigue Strength, MPa 170
160 to 240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Shear Strength, MPa 430
310 to 380
Tensile Strength: Ultimate (UTS), MPa 630
500 to 600
Tensile Strength: Yield (Proof), MPa 190
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Mechanical, °C 1090
600
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
26
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
10

Otherwise Unclassified Properties

Base Metal Price, % relative 30
6.5
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.3
2.1
Embodied Energy, MJ/kg 75
28
Embodied Water, L/kg 200
87

Common Calculations

PREN (Pitting Resistance) 21
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 95
140 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
18 to 21
Strength to Weight: Bending, points 20
18 to 20
Thermal Diffusivity, mm2/s 3.2
6.9
Thermal Shock Resistance, points 15
14 to 17

Alloy Composition

Aluminum (Al), % 0.2 to 0.5
0
Carbon (C), % 0.030 to 0.080
0 to 0.15
Chromium (Cr), % 19 to 22
8.0 to 10
Cobalt (Co), % 0 to 0.5
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 41.1 to 50.6
87.1 to 90.8
Manganese (Mn), % 0 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 30 to 32.5
0
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.015
0 to 0.025
Silicon (Si), % 0 to 0.7
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.025
Titanium (Ti), % 0.2 to 0.5
0
Vanadium (V), % 0
0 to 0.040