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EN 1.4749 Stainless Steel vs. EN 1.4740 Stainless Steel

Both EN 1.4749 stainless steel and EN 1.4740 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 90% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is EN 1.4749 stainless steel and the bottom bar is EN 1.4740 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
260
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 16
22
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
77

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 450
410
Maximum Temperature: Mechanical, °C 1100
900
Melting Completion (Liquidus), °C 1420
1420
Melting Onset (Solidus), °C 1380
1370
Specific Heat Capacity, J/kg-K 490
490
Thermal Conductivity, W/m-K 17
18
Thermal Expansion, µm/m-K 9.6
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 13
9.5
Density, g/cm3 7.6
7.6
Embodied Carbon, kg CO2/kg material 2.5
2.3
Embodied Energy, MJ/kg 36
32
Embodied Water, L/kg 160
120

Common Calculations

PREN (Pitting Resistance) 31
18
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
25
Thermal Diffusivity, mm2/s 4.6
4.8

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.3 to 0.5
Chromium (Cr), % 26 to 29
16 to 19
Iron (Fe), % 68.5 to 73.7
75.4 to 82.7
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
1.0 to 2.5
Sulfur (S), % 0 to 0.015
0 to 0.030