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ASTM A182 Grade F6b vs. S21900 Stainless Steel

Both ASTM A182 grade F6b and S21900 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 78% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A182 grade F6b and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
220
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 18
50
Fatigue Strength, MPa 440
380
Poisson's Ratio 0.28
0.28
Reduction in Area, % 51
57
Shear Modulus, GPa 76
78
Shear Strength, MPa 530
510
Tensile Strength: Ultimate (UTS), MPa 850
710
Tensile Strength: Yield (Proof), MPa 710
390

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
420
Maximum Temperature: Mechanical, °C 750
980
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
14
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 8.0
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.2
3.0
Embodied Energy, MJ/kg 30
43
Embodied Water, L/kg 100
160

Common Calculations

PREN (Pitting Resistance) 14
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
300
Resilience: Unit (Modulus of Resilience), kJ/m3 1280
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 30
26
Strength to Weight: Bending, points 26
23
Thermal Diffusivity, mm2/s 6.7
3.8
Thermal Shock Resistance, points 31
15

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 11.5 to 13.5
19 to 21.5
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 81.2 to 87.1
59.4 to 67.4
Manganese (Mn), % 0 to 1.0
8.0 to 10
Molybdenum (Mo), % 0.4 to 0.6
0
Nickel (Ni), % 1.0 to 2.0
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.020
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030