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AISI 316 Stainless Steel vs. AISI 321H Stainless Steel

Both AISI 316 stainless steel and AISI 321H stainless steel are iron alloys. They have a very high 96% 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 316 stainless steel and the bottom bar is AISI 321H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 360
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 8.0 to 55
40
Fatigue Strength, MPa 210 to 430
200
Poisson's Ratio 0.28
0.28
Reduction in Area, % 80
51
Rockwell B Hardness 80
82
Shear Modulus, GPa 78
77
Shear Strength, MPa 350 to 690
400
Tensile Strength: Ultimate (UTS), MPa 520 to 1180
580
Tensile Strength: Yield (Proof), MPa 230 to 850
230

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 410
480
Maximum Temperature: Mechanical, °C 590
940
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1380
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 19
16
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.9
3.2
Embodied Energy, MJ/kg 53
46
Embodied Water, L/kg 150
140

Common Calculations

PREN (Pitting Resistance) 26
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 85 to 260
190
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 1820
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18 to 41
21
Strength to Weight: Bending, points 18 to 31
20
Thermal Diffusivity, mm2/s 4.1
4.0
Thermal Shock Resistance, points 11 to 26
12

Alloy Composition

Carbon (C), % 0 to 0.080
0.040 to 0.1
Chromium (Cr), % 16 to 18
17 to 19
Iron (Fe), % 62 to 72
65.4 to 74
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 10 to 14
9.0 to 12
Nitrogen (N), % 0 to 0.1
0
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