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UNS S35045 (Alloy 803) Stainless Steel

S35045 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. S35045 is the UNS number for this material. Alloy 803 is the common industry name.

It has a fairly low tensile strength among the wrought superaustenitic stainless steels in the database.

The graph bars on the material properties cards below compare S35045 stainless steel to: wrought superaustenitic 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

39 %

Fatigue Strength

170 MPa 24 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

370 MPa 54 x 103 psi

Tensile Strength: Ultimate (UTS)

540 MPa 79 x 103 psi

Tensile Strength: Yield (Proof)

190 MPa 28 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

520 °C 970 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1390 °C 2530 °F

Melting Onset (Solidus)

1340 °C 2440 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 7.1 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

34 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

5.8 kg CO2/kg material

Embodied Energy

83 MJ/kg 36 x 103 BTU/lb

Embodied Water

230 L/kg 28 gal/lb

Common Calculations

PREN (Pitting Resistance)

27

Resilience: Ultimate (Unit Rupture Work)

170 MJ/m3

Resilience: Unit (Modulus of Resilience)

94 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

3.2 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Among wrought stainless steels, the composition of S35045 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including aluminum (Al). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Aluminum is used to improve oxidation resistance. It can also enhance the effects of heat treatment.

Iron (Fe) 29.4 to 42.6
Nickel (Ni) 32 to 37
Chromium (Cr) 25 to 29
Manganese (Mn) 0 to 1.5
Silicon (Si) 0 to 1.0
Aluminum (Al) 0.15 to 0.6
Titanium (Ti) 0.15 to 0.6
Copper (Cu) 0 to 0.75
Carbon (C) 0.060 to 0.1
Phosphorus (P) 0 to 0.045
Sulfur (S) 0 to 0.015

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

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

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

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

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