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EN 1.4988 Stainless Steel vs. EN 1.4938 Stainless Steel

Both EN 1.4988 stainless steel and EN 1.4938 stainless steel are iron alloys. They have 83% 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 1.4988 stainless steel and the bottom bar is EN 1.4938 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
16 to 17
Fatigue Strength, MPa 230
390 to 520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Shear Strength, MPa 430
540 to 630
Tensile Strength: Ultimate (UTS), MPa 640
870 to 1030
Tensile Strength: Yield (Proof), MPa 290
640 to 870

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 520
390
Maximum Temperature: Mechanical, °C 920
750
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 15
30
Thermal Expansion, µm/m-K 16
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 23
10
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 6.0
3.3
Embodied Energy, MJ/kg 89
47
Embodied Water, L/kg 150
110

Common Calculations

PREN (Pitting Resistance) 22
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 210
1050 to 1920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 23
31 to 37
Strength to Weight: Bending, points 21
26 to 29
Thermal Diffusivity, mm2/s 4.0
8.1
Thermal Shock Resistance, points 14
30 to 35

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.080 to 0.15
Chromium (Cr), % 15.5 to 17.5
11 to 12.5
Iron (Fe), % 62.1 to 69.5
80.5 to 84.8
Manganese (Mn), % 0 to 1.5
0.4 to 0.9
Molybdenum (Mo), % 1.1 to 1.5
1.5 to 2.0
Nickel (Ni), % 12.5 to 14.5
2.0 to 3.0
Niobium (Nb), % 0.4 to 1.2
0
Nitrogen (N), % 0.060 to 0.14
0.020 to 0.040
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.3 to 0.6
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0.6 to 0.85
0.25 to 0.4