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UNS S15500 (15-5 PH, 1.4545, XM-12) Stainless Steel

S15500 stainless steel is a precipitation-hardening stainless steel formulated for primary forming into wrought products. XM-12 is the ASTM designation for this material. 1.4545 is the EN numeric designation. S15500 is the UNS number. And 15-5 PH is the common industry name.

It has a moderately low embodied energy among the wrought precipitation-hardening stainless steels in the database.

The properties of S15500 stainless steel include seven 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 S15500 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

290 to 430

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

6.8 to 16 %

Fatigue Strength

350 to 650 MPa 51 to 95 x 103 psi

Impact Strength: V-Notched Charpy

7.8 to 53 J 5.7 to 39 ft-lb

Poisson's Ratio

0.28

Reduction in Area

17 to 40 %

Rockwell C Hardness

27 to 46

Shear Modulus

75 GPa 11 x 106 psi

Shear Strength

540 to 870 MPa 79 to 130 x 103 psi

Tensile Strength: Ultimate (UTS)

890 to 1490 MPa 130 to 220 x 103 psi

Tensile Strength: Yield (Proof)

590 to 1310 MPa 85 to 190 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

440 °C 830 °F

Maximum Temperature: Mechanical

820 °C 1510 °F

Melting Completion (Liquidus)

1430 °C 2600 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.8 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

13 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

39 MJ/kg 17 x 103 BTU/lb

Embodied Water

130 L/kg 15 gal/lb

Common Calculations

PREN (Pitting Resistance)

15

Resilience: Ultimate (Unit Rupture Work)

98 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

890 to 4460 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

32 to 53 points

Strength to Weight: Bending

26 to 37 points

Thermal Diffusivity

4.6 mm2/s

Thermal Shock Resistance

30 to 50 points

Alloy Composition

Among wrought stainless steels, the composition of S15500 stainless steel is notable for including niobium (Nb) and copper (Cu). Niobium is primarily used to improve yield strength, particularly at elevated temperatures. Copper is used to improve resistance to acids, and to improve formability.

Iron (Fe) 71.9 to 79.9
Chromium (Cr) 14 to 15.5
Nickel (Ni) 3.5 to 5.5
Copper (Cu) 2.5 to 4.5
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Niobium (Nb) 0.15 to 0.45
Carbon (C) 0 to 0.070
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.030

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

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

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