HIGH SPEED STEEL-M42

M42 High-Speed Steel is a premium, cobalt-rich alloy specifically developed for applications requiring exceptional hot hardness and superior performance under extreme conditions. The high cobalt content in its composition significantly enhances its ability to retain hardness and cutting efficiency, even at elevated temperatures, making it an excellent choice for high-stress machining and cutting operations. This steel is designed to provide a perfect combination of machinability, wear resistance, and durability, ensuring consistent performance in demanding industrial environments.

One of the standout features of M42 is its heat-treated hardness, which can reach up to 70 HRc. This remarkable level of hardness not only improves its cutting capabilities but also extends the tool’s service life by offering outstanding resistance to wear and deformation.

Chemical Composition

Element Min Max
Carbon, C 0.36 0.42
Manganese, Mn 1.00
Silicon, Si 1.00
Molybdenum, Mo 1.00 1.30
Chromium, Cr 12.50 14.50
Sulfur, S 0.33
Phosphor, P 0.33

PHYSICAL PROPERTIES

Properties Metric Imperial
Density 7.81 g/cm³ 0.282 lb/in³

Mechanical PROPERTIES

Properties Metric Imperial
Hardness, Rockwell C (oil quenched from 1204°C, 5 minutes) 64.3 64.3
Hardness, Rockwell C (oil quenched from 1177°C, 5 minutes) 65.5 65.5
Hardness, Rockwell C (oil quenched from 1163°C) 65.8 65.8
Izod impact unnotched (oil quenched at 1191°C; 510°C temper temperature) 13.6 J 10.0 ft-lb
Izod impact unnotched (oil quenched at 1191°C; 622°C temper temperature) 24.4 J 25.8
Machinability (1% carbon steel) 35.0 – 40.0% 35.0 – 40.0%
Poisson’s ratio 0.27-0.30 0.27-0.30
Elastic modulus 0.27-0.30 27557-30458 ksi

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