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UNS S44401 Stainless Steel

S44401 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. It has a moderately low electrical conductivity among the wrought ferritic stainless steels in the database.

The graph bars on the material properties cards below compare S44401 stainless steel to: wrought ferritic 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

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

21 %

Fatigue Strength

200 MPa 29 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

300 MPa 44 x 103 psi

Tensile Strength: Ultimate (UTS)

480 MPa 70 x 103 psi

Tensile Strength: Yield (Proof)

300 MPa 44 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

510 °C 940 °F

Maximum Temperature: Mechanical

930 °C 1710 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

22 W/m-K 13 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

40 MJ/kg 17 x 103 BTU/lb

Embodied Water

130 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)

26

Resilience: Ultimate (Unit Rupture Work)

90 MJ/m3

Resilience: Unit (Modulus of Resilience)

230 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

5.9 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among wrought stainless steels, the composition of S44401 stainless steel is notable for including titanium (Ti). Titanium is used to broadly improve mechanical properties.

Iron (Fe) 75.1 to 80.6
Chromium (Cr) 17.5 to 19.5
Molybdenum (Mo) 1.8 to 2.5
Manganese (Mn) 0 to 1.0
Nickel (Ni) 0 to 1.0
Titanium (Ti) 0.2 to 0.8
Phosphorus (P) 0 to 0.040
Nitrogen (N) 0 to 0.035
Sulfur (S) 0 to 0.030
Carbon (C) 0 to 0.025

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A493: Standard Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging

ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010