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UNS S64512 (XM-32) Stainless Steel

S64512 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the heat treated (HT) condition. XM-32 is the ASTM designation for this material. S64512 is the UNS number.

It has a fairly high electrical conductivity among wrought martensitic stainless steels. In addition, it has a fairly high embodied energy and a fairly high tensile strength.

The graph bars on the material properties cards below compare S64512 stainless steel to: wrought martensitic 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

330

Elastic (Young's, Tensile) Modulus

200 GPa 28 x 106 psi

Elongation at Break

17 %

Fatigue Strength

540 MPa 79 x 103 psi

Impact Strength: V-Notched Charpy

47 J 34 ft-lb

Poisson's Ratio

0.28

Reduction in Area

34 %

Shear Modulus

76 GPa 11 x 106 psi

Shear Strength

700 MPa 100 x 103 psi

Tensile Strength: Ultimate (UTS)

1140 MPa 170 x 103 psi

Tensile Strength: Yield (Proof)

890 MPa 130 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Maximum Temperature: Corrosion

390 °C 730 °F

Maximum Temperature: Mechanical

750 °C 1380 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

28 W/m-K 16 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

3.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

4.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

3.3 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

110 L/kg 13 gal/lb

Common Calculations

PREN (Pitting Resistance)

18

Resilience: Ultimate (Unit Rupture Work)

180 MJ/m3

Resilience: Unit (Modulus of Resilience)

2020 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

40 points

Strength to Weight: Bending

31 points

Thermal Diffusivity

7.5 mm2/s

Thermal Shock Resistance

42 points

Alloy Composition

Among wrought stainless steels, the composition of S64512 stainless steel is notable for including vanadium (V). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering.

Iron (Fe) 80.6 to 84.7
Chromium (Cr) 11 to 12.5
Nickel (Ni) 2.0 to 3.0
Molybdenum (Mo) 1.5 to 2.0
Manganese (Mn) 0.5 to 0.9
Vanadium (V) 0.25 to 0.4
Silicon (Si) 0 to 0.35
Carbon (C) 0.080 to 0.15
Nitrogen (N) 0.010 to 0.050
Phosphorus (P) 0 to 0.025
Sulfur (S) 0 to 0.025

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

Followup Questions

Similar Alloys

Further Reading

ASTM A565: Standard Specification for Martensitic Stainless Steel Bars for High-Temperature Service

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