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S44725 Stainless Steel vs. EN 1.7729 Steel

Both S44725 stainless steel and EN 1.7729 steel are iron alloys. They have 73% of their average alloy composition in common. There are 32 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 S44725 stainless steel and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
270
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 22
17
Fatigue Strength, MPa 210
500
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 320
560
Tensile Strength: Ultimate (UTS), MPa 500
910
Tensile Strength: Yield (Proof), MPa 310
750

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
40
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 15
3.8
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
3.3
Embodied Energy, MJ/kg 44
49
Embodied Water, L/kg 170
59

Common Calculations

PREN (Pitting Resistance) 33
4.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
150
Resilience: Unit (Modulus of Resilience), kJ/m3 240
1500
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
32
Strength to Weight: Bending, points 18
27
Thermal Diffusivity, mm2/s 4.6
11
Thermal Shock Resistance, points 16
27

Alloy Composition

Aluminum (Al), % 0
0.015 to 0.080
Arsenic (As), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0 to 0.015
0.17 to 0.23
Chromium (Cr), % 25 to 28.5
0.9 to 1.2
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 67.6 to 73.5
94.8 to 97
Manganese (Mn), % 0 to 0.4
0.35 to 0.75
Molybdenum (Mo), % 1.5 to 2.5
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0 to 0.2
Niobium (Nb), % 0 to 0.26
0
Nitrogen (N), % 0 to 0.018
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.040
0 to 0.4
Sulfur (S), % 0 to 0.020
0 to 0.015
Tin (Sn), % 0
0 to 0.020
Titanium (Ti), % 0 to 0.26
0.070 to 0.15
Vanadium (V), % 0
0.6 to 0.8