ASTM A182 Grade F6b (S41026) Stainless Steel
ASTM A182 grade F6b is a martensitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. F6b is the ASTM designation for this material. S41026 is the UNS number.
The graph bars on the material properties cards below compare ASTM A182 grade F6b to: wrought martensitic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
260
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
18 %
Fatigue Strength
440 MPa 63 x 103 psi
Poisson's Ratio
0.28
Reduction in Area
51 %
Shear Modulus
76 GPa 11 x 106 psi
Shear Strength
530 MPa 76 x 103 psi
Tensile Strength: Ultimate (UTS)
850 MPa 120 x 103 psi
Tensile Strength: Yield (Proof)
710 MPa 100 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
390 °C 730 °F
Maximum Temperature: Mechanical
750 °C 1390 °F
Melting Completion (Liquidus)
1450 °C 2630 °F
Melting Onset (Solidus)
1400 °C 2560 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
25 W/m-K 14 BTU/h-ft-°F
Thermal Expansion
10 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.8 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
8.0 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
2.2 kg CO2/kg material
Embodied Energy
30 MJ/kg 13 x 103 BTU/lb
Embodied Water
100 L/kg 12 gal/lb
Common Calculations
PREN (Pitting Resistance)
14
Resilience: Ultimate (Unit Rupture Work)
140 MJ/m3
Resilience: Unit (Modulus of Resilience)
1280 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
30 points
Strength to Weight: Bending
26 points
Thermal Diffusivity
6.7 mm2/s
Thermal Shock Resistance
31 points
Alloy Composition
Among wrought stainless steels, the composition of ASTM A182 grade F6b is notable for including copper (Cu). Copper is used to improve resistance to acids, and to improve formability.
| Fe | 81.2 to 87.1 | |
| Cr | 11.5 to 13.5 | |
| Ni | 1.0 to 2.0 | |
| Mn | 0 to 1.0 | |
| Si | 0 to 1.0 | |
| Mo | 0.4 to 0.6 | |
| Cu | 0 to 0.5 | |
| C | 0 to 0.15 | |
| P | 0 to 0.020 | |
| S | 0 to 0.020 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service