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AISI 347H Stainless Steel vs. AISI 321 Stainless Steel

Both AISI 347H stainless steel and AISI 321 stainless steel are iron alloys. Their average alloy composition is basically identical. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AISI 347H stainless steel and the bottom bar is AISI 321 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
34 to 50
Fatigue Strength, MPa 200
220 to 270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 400
420 to 460
Tensile Strength: Ultimate (UTS), MPa 580
590 to 690
Tensile Strength: Yield (Proof), MPa 230
220 to 350

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 480
480
Maximum Temperature: Mechanical, °C 940
870
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 16
17

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 19
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
3.2
Embodied Energy, MJ/kg 52
45
Embodied Water, L/kg 150
140

Common Calculations

PREN (Pitting Resistance) 18
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
190 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 140
130 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
21 to 25
Strength to Weight: Bending, points 20
20 to 22
Thermal Diffusivity, mm2/s 4.2
4.1
Thermal Shock Resistance, points 13
13 to 15

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.080
Chromium (Cr), % 17 to 19
17 to 19
Iron (Fe), % 64.1 to 74
65.3 to 74
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 9.0 to 13
9.0 to 12
Niobium (Nb), % 0 to 1.0
0
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.7