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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.

Iron (Fe) 81.2 to 87.1
Chromium (Cr) 11.5 to 13.5
Nickel (Ni) 1.0 to 2.0
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Molybdenum (Mo) 0.4 to 0.6
Copper (Cu) 0 to 0.5
Carbon (C) 0 to 0.15
Phosphorus (P) 0 to 0.020
Sulfur (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