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EN 1.4988 Stainless Steel vs. EN 1.4821 Stainless Steel

Both EN 1.4988 stainless steel and EN 1.4821 stainless steel are iron alloys. They have 88% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4988 stainless steel and the bottom bar is EN 1.4821 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
200
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
18
Fatigue Strength, MPa 230
280
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Shear Strength, MPa 430
450
Tensile Strength: Ultimate (UTS), MPa 640
730
Tensile Strength: Yield (Proof), MPa 290
450

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Maximum Temperature: Corrosion, °C 520
450
Maximum Temperature: Mechanical, °C 920
1100
Melting Completion (Liquidus), °C 1450
1410
Melting Onset (Solidus), °C 1400
1370
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 23
15
Density, g/cm3 7.9
7.6
Embodied Carbon, kg CO2/kg material 6.0
2.9
Embodied Energy, MJ/kg 89
41
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 22
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
110
Resilience: Unit (Modulus of Resilience), kJ/m3 210
500
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 23
26
Strength to Weight: Bending, points 21
23
Thermal Diffusivity, mm2/s 4.0
4.6
Thermal Shock Resistance, points 14
21

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.1 to 0.2
Chromium (Cr), % 15.5 to 17.5
24.5 to 26.5
Iron (Fe), % 62.1 to 69.5
64.2 to 71.1
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 1.1 to 1.5
0
Nickel (Ni), % 12.5 to 14.5
3.5 to 5.5
Niobium (Nb), % 0.4 to 1.2
0
Nitrogen (N), % 0.060 to 0.14
0 to 0.1
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.3 to 0.6
0.8 to 1.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0.6 to 0.85
0