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EN 1.4658 Stainless Steel vs. ASTM A387 Grade 21 Steel

Both EN 1.4658 stainless steel and ASTM A387 grade 21 steel are iron alloys. They have 62% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.4658 stainless steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 28
21
Fatigue Strength, MPa 530
160 to 250
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
74
Shear Strength, MPa 580
310 to 370
Tensile Strength: Ultimate (UTS), MPa 900
500 to 590
Tensile Strength: Yield (Proof), MPa 730
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Maximum Temperature: Mechanical, °C 1100
480
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
41
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
4.1
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 4.5
1.8
Embodied Energy, MJ/kg 61
23
Embodied Water, L/kg 200
62

Common Calculations

PREN (Pitting Resistance) 49
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1280
140 to 320
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32
18 to 21
Strength to Weight: Bending, points 26
18 to 20
Thermal Diffusivity, mm2/s 4.3
11
Thermal Shock Resistance, points 24
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.15
Chromium (Cr), % 26 to 29
2.8 to 3.3
Cobalt (Co), % 0.5 to 2.0
0
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 50.9 to 63.7
94.4 to 96
Manganese (Mn), % 0 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 4.0 to 5.0
0.9 to 1.1
Nickel (Ni), % 5.5 to 9.5
0
Nitrogen (N), % 0.3 to 0.5
0
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.025