Hardened H25 Tool Steel
Hardened SAE-AISI H25 is SAE-AISI H25 steel in the hardened (H) condition. The graph bars on the material properties cards below compare hardened SAE-AISI H25 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
50
Shear Modulus
79 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
1620 MPa 240 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Melting Completion (Liquidus)
1750 °C 3180 °F
Melting Onset (Solidus)
1700 °C 3090 °F
Specific Heat Capacity
420 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
26 W/m-K 15 BTU/h-ft-°F
Thermal Expansion
12 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
38 % relative
Density
9.1 g/cm3 570 lb/ft3
Embodied Carbon
6.2 kg CO2/kg material
Embodied Energy
93 MJ/kg 40 x 103 BTU/lb
Embodied Water
83 L/kg 9.9 gal/lb
Common Calculations
PREN (Pitting Resistance)
29
Stiffness to Weight: Axial
12 points
Stiffness to Weight: Bending
22 points
Strength to Weight: Axial
50 points
Strength to Weight: Bending
34 points
Thermal Diffusivity
6.7 mm2/s
Thermal Shock Resistance
49 points
Alloy Composition
| Fe | 77.2 to 81.3 | |
| W | 14 to 16 | |
| Cr | 3.8 to 4.5 | |
| V | 0.4 to 0.6 | |
| Mn | 0.15 to 0.4 | |
| Si | 0.15 to 0.4 | |
| C | 0.22 to 0.32 | |
| Ni | 0 to 0.3 | |
| Cu | 0 to 0.25 | |
| P | 0 to 0.030 | |
| S | 0 to 0.030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM A681: Standard Specification for Tool Steels Alloy
Tool Steels: Properties and Performance, Rafael A. Mesquita (editor), 2016
ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996