1.3243 | M35 | SKH-55
It is a tungsten‑molybdenum cobalt‑containing high‑speed steel. It offers improved red hardness and high‑temperature hardness, enhanced wear resistance and good cutting performance.
Available Form
Round Bar
Custom Diameter & Length
Flat Bar
Custom Thickness, Width & Length
Square Bar
Custom Width & Length
Steel Plate
Custom Thickness, Width & Length
Steel Grade Comparison(wt%)
| W-Nr | EN | AISI | JIS |
| 1.3243 | S6-5-2-5 | M35 | SKH-55 |
Chemical Composition
| C | Si | Mn | P | S | Cr | Mo | W | V |
| 0.86~0.94 | ≤0.45 | ≤0.40 | ≤0.030 | ≤0.030 | 3.80~4.50 | 4.70~5.20 | 5.90~6.70 | 1.75~2.10 |
Physical Properties
Density（g/cm3)：8.1
Modulus of Elasticity（Gpa): 217
Thermal Conductivity（W/（m.k)): 19.0
| Temperature/℃ | 20-100 | 2-200 | 2-300 | 2-400 |
| Coefficient of Thermal Expansion（×10-6） | 9.7 | 10.5 | 11 | 11.4 |
Heat Treatment Process
Hardening: Heat the steel evenly to 450~650°C until the whole section reaches temperature. Then quench in oil to cool.
Annealing: Heat the steel to 790~820°C, hold it well at temperature, and then let it cool slowly inside the furnace.
Tempering: Heat the steel uniformly, hold it at the selected tempering temperature, and then allow it to cool in still air. Tempering temperature: 550~570°C, hardness ≥64 HRC
Application Fields
High-stress drills, milling cutters, profile cutting tools, thread-cutting drills and cold forming tools.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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