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.
| Fe | 29.4 to 42.6 | |
| Ni | 32 to 37 | |
| Cr | 25 to 29 | |
| Mn | 0 to 1.5 | |
| Si | 0 to 1.0 | |
| Al | 0.15 to 0.6 | |
| Ti | 0.15 to 0.6 | |
| Cu | 0 to 0.75 | |
| C | 0.060 to 0.1 | |
| P | 0 to 0.045 | |
| 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