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AISI 348H Stainless Steel vs. AISI 446 Stainless Steel

Both AISI 348H stainless steel and AISI 446 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 88% of their average alloy composition in common. There are 35 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 AISI 348H stainless steel and the bottom bar is AISI 446 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
23
Fatigue Strength, MPa 200
200
Poisson's Ratio 0.28
0.27
Reduction in Area, % 51
50
Rockwell B Hardness 79
84
Shear Modulus, GPa 77
79
Shear Strength, MPa 400
360
Tensile Strength: Ultimate (UTS), MPa 580
570
Tensile Strength: Yield (Proof), MPa 230
300

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 500
440
Maximum Temperature: Mechanical, °C 940
1180
Melting Completion (Liquidus), °C 1430
1510
Melting Onset (Solidus), °C 1390
1430
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 16
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 20
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.9
2.4
Embodied Energy, MJ/kg 56
35
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 18
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
110
Resilience: Unit (Modulus of Resilience), kJ/m3 140
230
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 21
21
Strength to Weight: Bending, points 20
20
Thermal Diffusivity, mm2/s 4.1
4.6
Thermal Shock Resistance, points 13
19

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.2
Chromium (Cr), % 17 to 19
23 to 27
Cobalt (Co), % 0 to 0.2
0
Iron (Fe), % 63.8 to 73.6
69.2 to 77
Manganese (Mn), % 0 to 2.0
0 to 1.5
Nickel (Ni), % 9.0 to 13
0 to 0.75
Niobium (Nb), % 0.32 to 1.0
0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0 to 0.1
0