Annealed M50 Tool Steel
Annealed SAE-AISI M50 is SAE-AISI M50 steel in the annealed condition. The graph bars on the material properties cards below compare annealed SAE-AISI M50 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
Brinell Hardness
220
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Poisson's Ratio
0.29
Shear Modulus
75 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
720 MPa 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Melting Completion (Liquidus)
1480 °C 2700 °F
Melting Onset (Solidus)
1440 °C 2630 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
35 W/m-K 21 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
8.7 % IACS
Electrical Conductivity: Equal Weight (Specific)
10 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.0 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
5.1 kg CO2/kg material
Embodied Energy
74 MJ/kg 32 x 103 BTU/lb
Embodied Water
83 L/kg 9.9 gal/lb
Common Calculations
PREN (Pitting Resistance)
19
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
26 points
Strength to Weight: Bending
23 points
Thermal Diffusivity
9.7 mm2/s
Thermal Shock Resistance
21 points
Alloy Composition
| Fe | 87 to 90.4 | |
| Mo | 3.9 to 4.8 | |
| Cr | 3.8 to 4.5 | |
| V | 0.8 to 1.3 | |
| C | 0.78 to 0.88 | |
| Si | 0.2 to 0.6 | |
| Mn | 0.15 to 0.45 | |
| 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 A600: Standard Specification for Tool Steel High Speed
Tool Steels: Properties and Performance, Rafael A. Mesquita (editor), 2016
ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015