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EN 1.4021 Stainless Steel vs. EN 1.7390 Steel

Both EN 1.4021 stainless steel and EN 1.7390 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 31 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 1.4021 stainless steel and the bottom bar is EN 1.7390 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
16
Fatigue Strength, MPa 240 to 380
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
74
Shear Strength, MPa 390 to 530
440
Tensile Strength: Ultimate (UTS), MPa 630 to 880
710
Tensile Strength: Yield (Proof), MPa 390 to 670
480

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 760
510
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 30
40
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
4.3
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.7
Embodied Energy, MJ/kg 27
23
Embodied Water, L/kg 100
69

Common Calculations

PREN (Pitting Resistance) 13
6.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 110
100
Resilience: Unit (Modulus of Resilience), kJ/m3 400 to 1160
600
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 23 to 31
25
Strength to Weight: Bending, points 21 to 26
23
Thermal Diffusivity, mm2/s 8.1
11
Thermal Shock Resistance, points 22 to 31
20

Alloy Composition

Carbon (C), % 0.16 to 0.25
0 to 0.18
Chromium (Cr), % 12 to 14
4.0 to 6.0
Iron (Fe), % 83.2 to 87.8
91.9 to 95.3
Manganese (Mn), % 0 to 1.5
0.3 to 0.8
Molybdenum (Mo), % 0
0.45 to 0.65
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.015