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AISI 348H Stainless Steel vs. AISI 429 Stainless Steel

Both AISI 348H stainless steel and AISI 429 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 85% of their average alloy composition in common.

For each property being compared, the top bar is AISI 348H stainless steel and the bottom bar is AISI 429 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
25
Fatigue Strength, MPa 200
180
Poisson's Ratio 0.28
0.28
Reduction in Area, % 51
50
Rockwell B Hardness 79
78
Shear Modulus, GPa 77
77
Shear Strength, MPa 400
300
Tensile Strength: Ultimate (UTS), MPa 580
480
Tensile Strength: Yield (Proof), MPa 230
260

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 500
400
Maximum Temperature: Mechanical, °C 940
810
Melting Completion (Liquidus), °C 1430
1440
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
26
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 20
7.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.9
2.0
Embodied Energy, MJ/kg 56
28
Embodied Water, L/kg 150
110

Common Calculations

PREN (Pitting Resistance) 18
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
99
Resilience: Unit (Modulus of Resilience), kJ/m3 140
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
17
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 4.1
6.9
Thermal Shock Resistance, points 13
17

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.12
Chromium (Cr), % 17 to 19
14 to 16
Cobalt (Co), % 0 to 0.2
0
Iron (Fe), % 63.8 to 73.6
81.8 to 86
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 9.0 to 13
0
Niobium (Nb), % 0.32 to 1.0
0
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