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UNS S44660 (26-3-3) Stainless Steel

S44660 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. S44660 is the UNS number for this material. 26-3-3 is the common industry name.

It has a fairly high base cost among wrought ferritic stainless steels. In addition, it has a fairly high embodied energy and a fairly high tensile strength.

The graph bars on the material properties cards below compare S44660 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

Brinell Hardness

210

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

20 %

Fatigue Strength

330 MPa 48 x 103 psi

Poisson's Ratio

0.27

Rockwell B Hardness

88

Shear Modulus

81 GPa 12 x 106 psi

Shear Strength

410 MPa 59 x 103 psi

Tensile Strength: Ultimate (UTS)

660 MPa 95 x 103 psi

Tensile Strength: Yield (Proof)

510 MPa 74 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

640 °C 1190 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1410 °C 2580 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.6 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

21 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

4.3 kg CO2/kg material

Embodied Energy

61 MJ/kg 26 x 103 BTU/lb

Embodied Water

180 L/kg 21 gal/lb

Common Calculations

PREN (Pitting Resistance)

38

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

640 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

4.5 mm2/s

Thermal Shock Resistance

21 points

Alloy Composition

Among wrought stainless steels, the composition of S44660 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including titanium (Ti). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Titanium is used to broadly improve mechanical properties.

Iron (Fe) 60.4 to 71
Chromium (Cr) 25 to 28
Molybdenum (Mo) 3.0 to 4.0
Nickel (Ni) 1.0 to 3.5
Niobium (Nb) 0.2 to 1.0
Titanium (Ti) 0.2 to 1.0
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Phosphorus (P) 0 to 0.040
Nitrogen (N) 0 to 0.040
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.030

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

Followup Questions

Similar Alloys

Further Reading

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

ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

Corrosion of Stainless Steels, A. John Sedriks, 1996

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

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