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AISI 444 Stainless Steel vs. S41045 Stainless Steel

Both AISI 444 stainless steel and S41045 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is AISI 444 stainless steel and the bottom bar is S41045 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
160
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 23
25
Fatigue Strength, MPa 210
160
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 83
70
Shear Modulus, GPa 78
76
Shear Strength, MPa 300
280
Tensile Strength: Ultimate (UTS), MPa 470
430
Tensile Strength: Yield (Proof), MPa 310
230

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 580
430
Maximum Temperature: Mechanical, °C 930
740
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 23
29
Thermal Expansion, µm/m-K 10
10

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 15
8.5
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.4
2.2
Embodied Energy, MJ/kg 47
31
Embodied Water, L/kg 130
100

Common Calculations

PREN (Pitting Resistance) 26
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
92
Resilience: Unit (Modulus of Resilience), kJ/m3 240
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
16
Strength to Weight: Bending, points 17
16
Thermal Diffusivity, mm2/s 6.2
7.8
Thermal Shock Resistance, points 16
16

Alloy Composition

Carbon (C), % 0 to 0.025
0 to 0.030
Chromium (Cr), % 17.5 to 19.5
12 to 13
Iron (Fe), % 73.3 to 80.8
83.8 to 88
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 1.8 to 2.5
0
Nickel (Ni), % 0 to 1.0
0 to 0.5
Niobium (Nb), % 0.2 to 0.8
0 to 0.6
Nitrogen (N), % 0 to 0.035
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0.2 to 0.8
0