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UNS S41045 Stainless Steel

S41045 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 low tensile strength among wrought ferritic stainless steels. In addition, it has a moderately high thermal conductivity and a moderately high ductility.

The graph bars on the material properties cards below compare S41045 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

160

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

25 %

Fatigue Strength

160 MPa 23 x 103 psi

Poisson's Ratio

0.28

Rockwell B Hardness

70

Shear Modulus

76 GPa 11 x 106 psi

Shear Strength

280 MPa 40 x 103 psi

Tensile Strength: Ultimate (UTS)

430 MPa 63 x 103 psi

Tensile Strength: Yield (Proof)

230 MPa 33 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Maximum Temperature: Corrosion

430 °C 810 °F

Maximum Temperature: Mechanical

740 °C 1370 °F

Melting Completion (Liquidus)

1450 °C 2640 °F

Melting Onset (Solidus)

1400 °C 2560 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

29 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

8.5 % relative

Density

7.8 g/cm3 480 lb/ft3

Embodied Carbon

2.2 kg CO2/kg material

Embodied Energy

31 MJ/kg 13 x 103 BTU/lb

Embodied Water

100 L/kg 12 gal/lb

Common Calculations

PREN (Pitting Resistance)

13

Resilience: Ultimate (Unit Rupture Work)

92 MJ/m3

Resilience: Unit (Modulus of Resilience)

140 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

16 points

Strength to Weight: Bending

16 points

Thermal Diffusivity

7.8 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Among wrought stainless steels, the composition of S41045 stainless steel is notable for including niobium (Nb). Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Iron (Fe) 83.8 to 88
Chromium (Cr) 12 to 13
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Niobium (Nb) 0 to 0.6
Nickel (Ni) 0 to 0.5
Phosphorus (P) 0 to 0.040
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.030
Nitrogen (N) 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 and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

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

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