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UNS S44625 Stainless Steel

S44625 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 thermal conductivity among wrought ferritic stainless steels. In addition, it has a moderately low electrical conductivity and a moderately high base cost.

The graph bars on the material properties cards below compare S44625 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 30 x 106 psi

Elongation at Break

22 %

Fatigue Strength

240 MPa 35 x 103 psi

Poisson's Ratio

0.27

Shear Modulus

80 GPa 12 x 106 psi

Shear Strength

370 MPa 54 x 103 psi

Tensile Strength: Ultimate (UTS)

590 MPa 86 x 103 psi

Tensile Strength: Yield (Proof)

360 MPa 52 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

450 °C 850 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1440 °C 2630 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

480 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.8 BTU/h-ft-°F

Thermal Expansion

11 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

14 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

39 MJ/kg 17 x 103 BTU/lb

Embodied Water

160 L/kg 19 gal/lb

Common Calculations

PREN (Pitting Resistance)

30

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

310 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

21 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

4.6 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Among wrought stainless steels, the composition of S44625 stainless steel is notable for containing a comparatively high amount of chromium (Cr). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.

Iron (Fe) 69.4 to 74.3
Chromium (Cr) 25 to 27.5
Molybdenum (Mo) 0.75 to 1.5
Nickel (Ni) 0 to 0.5
Manganese (Mn) 0 to 0.4
Silicon (Si) 0 to 0.4
Copper (Cu) 0 to 0.2
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.020
Nitrogen (N) 0 to 0.015
Carbon (C) 0 to 0.010

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

Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016

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

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