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EN 1.4988 Stainless Steel vs. EN 1.4306 Stainless Steel

Both EN 1.4988 stainless steel and EN 1.4306 stainless steel are iron alloys. They have a moderately high 95% 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 1.4306 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
190 to 270
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
14 to 45
Fatigue Strength, MPa 230
190 to 330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 430
400 to 550
Tensile Strength: Ultimate (UTS), MPa 640
580 to 900
Tensile Strength: Yield (Proof), MPa 290
210 to 570

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 520
420
Maximum Temperature: Mechanical, °C 920
960
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 23
16
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 6.0
3.2
Embodied Energy, MJ/kg 89
45
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 22
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
110 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 210
110 to 820
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 23
21 to 32
Strength to Weight: Bending, points 21
20 to 27
Thermal Diffusivity, mm2/s 4.0
4.0
Thermal Shock Resistance, points 14
13 to 20

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.030
Chromium (Cr), % 15.5 to 17.5
18 to 20
Iron (Fe), % 62.1 to 69.5
64.8 to 72
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
10 to 12
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 0.045
Silicon (Si), % 0.3 to 0.6
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0.6 to 0.85
0