Hardened W1 Tool Steel
Hardened AISI W1 is AISI W1 steel in the hardened (H) condition. The graph bars on the material properties cards below compare hardened AISI W1 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
190 GPa 27 x 106 psi
Poisson's Ratio
0.29
Rockwell C Hardness
72
Shear Modulus
72 GPa 10 x 106 psi
Tensile Strength: Ultimate (UTS)
2320 MPa 340 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Melting Completion (Liquidus)
1450 °C 2640 °F
Melting Onset (Solidus)
1410 °C 2570 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
48 W/m-K 28 BTU/h-ft-°F
Thermal Expansion
10 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.1 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
2.2 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.6 kg CO2/kg material
Embodied Energy
21 MJ/kg 9.2 x 103 BTU/lb
Embodied Water
47 L/kg 5.5 gal/lb
Common Calculations
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
83 points
Strength to Weight: Bending
50 points
Thermal Diffusivity
13 mm2/s
Thermal Shock Resistance
85 points
Alloy Composition
| Fe | 96.4 to 98.9 | |
| C | 0.7 to 1.5 | |
| Mn | 0.35 to 0.73 | |
| Si | 0.1 to 0.4 | |
| Ni | 0 to 0.2 | |
| Cu | 0 to 0.2 | |
| Cr | 0 to 0.15 | |
| W | 0 to 0.15 | |
| Mo | 0 to 0.1 | |
| V | 0 to 0.1 | |
| P | 0 to 0.025 | |
| S | 0 to 0.025 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM A686: Standard Specification for Tool Steel, Carbon
Tool Steels: Properties and Performance, Rafael A. Mesquita (editor), 2016