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UNS S45503 Stainless Steel

S45503 stainless steel is a precipitation-hardening stainless steel formulated for primary forming into wrought products. It can have a fairly high tensile strength and a moderately low ductility among wrought precipitation-hardening stainless steels.

The properties of S45503 stainless steel include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare S45503 stainless steel to: wrought precipitation-hardening 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

410 to 500

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

4.6 to 6.8 %

Fatigue Strength

710 to 800 MPa 100 to 120 x 103 psi

Poisson's Ratio

0.28

Reduction in Area

17 to 28 %

Rockwell C Hardness

46 to 54

Shear Modulus

75 GPa 11 x 106 psi

Shear Strength

940 to 1070 MPa 140 to 160 x 103 psi

Tensile Strength: Ultimate (UTS)

1610 to 1850 MPa 230 to 270 x 103 psi

Tensile Strength: Yield (Proof)

1430 to 1700 MPa 210 to 250 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Maximum Temperature: Corrosion

640 °C 1190 °F

Maximum Temperature: Mechanical

760 °C 1400 °F

Melting Completion (Liquidus)

1440 °C 2630 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

11 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

15 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

3.4 kg CO2/kg material

Embodied Energy

48 MJ/kg 21 x 103 BTU/lb

Embodied Water

120 L/kg 14 gal/lb

Common Calculations

PREN (Pitting Resistance)

13

Resilience: Ultimate (Unit Rupture Work)

82 to 110 MJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

57 to 65 points

Strength to Weight: Bending

39 to 43 points

Thermal Shock Resistance

56 to 64 points

Alloy Composition

Among wrought stainless steels, the composition of S45503 stainless steel is notable for including titanium (Ti) and niobium (Nb). Titanium is used to broadly improve mechanical properties. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Iron (Fe) 72.4 to 78.9
Chromium (Cr) 11 to 12.5
Nickel (Ni) 7.5 to 9.5
Copper (Cu) 1.5 to 2.5
Titanium (Ti) 1.0 to 1.4
Niobium (Nb) 0.1 to 0.5
Manganese (Mn) 0 to 0.5
Molybdenum (Mo) 0 to 0.5
Silicon (Si) 0 to 0.2
Carbon (C) 0 to 0.010
Phosphorus (P) 0 to 0.010
Sulfur (S) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A564: Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes

Metallic Materials: Physical, Mechanical, and Corrosion Properties, Philip A. Schweitzer, 2003

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