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Hardened T15 Tool Steel

Hardened SAE-AISI T15 is SAE-AISI T15 steel in the hardened (H) condition. The graph bars on the material properties cards below compare hardened SAE-AISI T15 to: tool 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

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Poisson's Ratio

0.29

Rockwell C Hardness

69

Shear Modulus

76 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

2240 MPa 320 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Melting Completion (Liquidus)

1690 °C 3080 °F

Melting Onset (Solidus)

1640 °C 2990 °F

Specific Heat Capacity

430 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

21 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

43 % relative

Density

8.7 g/cm3 550 lb/ft3

Embodied Carbon

16 kg CO2/kg material

Embodied Energy

250 MJ/kg 110 x 103 BTU/lb

Embodied Water

140 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)

27

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

22 points

Strength to Weight: Axial

71 points

Strength to Weight: Bending

43 points

Thermal Diffusivity

5.6 mm2/s

Thermal Shock Resistance

70 points

Alloy Composition

Iron (Fe)Fe 67.5 to 73.5
Tungsten (W)W 11.8 to 13
Cobalt (Co)Co 4.8 to 5.3
Vanadium (V)V 4.5 to 5.3
Chromium (Cr)Cr 3.8 to 5.0
Carbon (C)C 1.5 to 1.6
Molybdenum (Mo)Mo 0 to 1.0
Manganese (Mn)Mn 0.15 to 0.4
Silicon (Si)Si 0.15 to 0.4
Nickel (Ni)Ni 0 to 0.3
Copper (Cu)Cu 0 to 0.25
Phosphorus (P)P 0 to 0.030
Sulfur (S)S 0 to 0.030

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

Followup Questions

Further Reading

ASTM A600: Standard Specification for Tool Steel High Speed

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010

Tool Steels, 5th ed., George Roberts et al., 1998

Tool Steels: Properties and Performance, Rafael A. Mesquita (editor), 2016

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996