MakeItFrom.com
Menu (ESC)

UNS S44537 Stainless Steel

S44537 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 fairly high base cost and a fairly high embodied energy among wrought ferritic stainless steels.

The graph bars on the material properties cards below compare S44537 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

180

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

21 %

Fatigue Strength

230 MPa 34 x 103 psi

Poisson's Ratio

0.27

Rockwell B Hardness

80

Shear Modulus

79 GPa 11 x 106 psi

Shear Strength

320 MPa 47 x 103 psi

Tensile Strength: Ultimate (UTS)

510 MPa 74 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

530 °C 990 °F

Maximum Temperature: Mechanical

1000 °C 1840 °F

Melting Completion (Liquidus)

1480 °C 2690 °F

Melting Onset (Solidus)

1430 °C 2610 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

21 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

19 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

3.4 kg CO2/kg material

Embodied Energy

50 MJ/kg 21 x 103 BTU/lb

Embodied Water

140 L/kg 17 gal/lb

Common Calculations

PREN (Pitting Resistance)

26

Resilience: Ultimate (Unit Rupture Work)

95 MJ/m3

Resilience: Unit (Modulus of Resilience)

320 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

5.6 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among wrought stainless steels, the composition of S44537 stainless steel is notable for including lanthanum (La) and tungsten (W). Lanthanum is used to get better mechanical properties from heat treatment. Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects.

Iron (Fe) 69 to 78.6
Chromium (Cr) 20 to 24
Tungsten (W) 1.0 to 3.0
Niobium (Nb) 0.2 to 1.0
Manganese (Mn) 0 to 0.8
Silicon (Si) 0.1 to 0.6
Nickel (Ni) 0 to 0.5
Copper (Cu) 0 to 0.5
Lanthanum (La) 0.040 to 0.2
Titanium (Ti) 0.020 to 0.2
Aluminum (Al) 0 to 0.1
Phosphorus (P) 0 to 0.050
Nitrogen (N) 0 to 0.040
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.0060

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

Followup Questions

Similar Alloys

Further Reading

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

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015