UNS S32803 Stainless Steel
S32803 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 thermal conductivity among wrought ferritic stainless steels. In addition, it has a fairly high tensile strength and a fairly high base cost.
The graph bars on the material properties cards below compare S32803 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
18 %
Fatigue Strength
350 MPa 51 x 103 psi
Poisson's Ratio
0.27
Rockwell B Hardness
86
Shear Modulus
81 GPa 12 x 106 psi
Shear Strength
420 MPa 61 x 103 psi
Tensile Strength: Ultimate (UTS)
680 MPa 99 x 103 psi
Tensile Strength: Yield (Proof)
560 MPa 81 x 103 psi
Thermal Properties
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
510 °C 940 °F
Maximum Temperature: Mechanical
1100 °C 2010 °F
Melting Completion (Liquidus)
1450 °C 2630 °F
Melting Onset (Solidus)
1400 °C 2550 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
16 W/m-K 9.4 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.6 % IACS
Otherwise Unclassified Properties
Base Metal Price
19 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
3.7 kg CO2/kg material
Embodied Energy
53 MJ/kg 23 x 103 BTU/lb
Embodied Water
180 L/kg 22 gal/lb
Common Calculations
PREN (Pitting Resistance)
36
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
760 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
25 points
Strength to Weight: Bending
22 points
Thermal Diffusivity
4.4 mm2/s
Thermal Shock Resistance
22 points
Alloy Composition
Among wrought stainless steels, the composition of S32803 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including niobium (Nb). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.
| Fe | 62.9 to 67.1 | |
| Cr | 28 to 29 | |
| Ni | 3.0 to 4.0 | |
| Mo | 1.8 to 2.5 | |
| Nb | 0.15 to 0.5 | |
| Si | 0 to 0.55 | |
| Mn | 0 to 0.5 | |
| P | 0 to 0.020 | |
| N | 0 to 0.020 | |
| C | 0 to 0.015 | |
| S | 0 to 0.0035 |
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 of Stainless Steels, Erich Folkhard et al., 2012
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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015