# 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 10 ^{6} psi*

Elongation at Break

18 *%*

Fatigue Strength

350 *MPa* 51 *x 10 ^{3} psi*

Poisson's Ratio

0.27

Rockwell B Hardness

86

Shear Modulus

81 *GPa* 12 *x 10 ^{6} psi*

Shear Strength

420 *MPa* 61 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

680 *MPa* 99 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

560 *MPa* 81 *x 10 ^{3} 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/cm ^{3}* 480

*lb/ft*

^{3}Embodied Carbon

3.7 *kg CO _{2}/kg material*

Embodied Energy

53 *MJ/kg* 23 *x 10 ^{3} BTU/lb*

Embodied Water

180 *L/kg* 22 *gal/lb*

## Common Calculations

PREN (Pitting Resistance)

36

Resilience: Ultimate (Unit Rupture Work)

120 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

760 *kJ/m ^{3}*

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 *mm ^{2}/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