AISI M42(UNS T11342) is the representative grade of high-carbon tungsten-molybdenum-cobalt high speed steel(HSS), which has the advantages of high normal temperature hardness (up to 70HRC) and high-temperature hardness, easy grinding and sharp.
M42 tool steel designation
AISI M42 / ASTM M42
M42 round/square bar
M42 Chemistry composition
1.05 – 1.15
3.50 – 4.25
9.00 – 10.00
1.15 – 1.85
0.95 – 1.35
0.15 – 0.65
Physical and Mechanical Properties
Soft annealing °C:820 – 860
Hardening °C: 1160-1190
Thermal expansion at 20-200° C: 9.7 10⁶m/(m*K)
Hardness, Rockwell C: 66 HRC.
For tools having severe mechanical abrasion. Particularly suitable for die-sinking cutters, milling cutters and engraving machines including gravers as well as for tool bits in automatic lathes. Also suitable for non-cutting shapings such as cold extrusion rams and titanium alloys.
Characterized by excessive put on resistance, red hardness and durability.
Easier to grind than most high speed steel.
LKALLOY is a leading Supplier of AISI M42 Steel. We mainly stocks and produces AISI M42 bar, AISI M42 flats, AISI M42 plates and other forms in various size and specifications.
Room 2509, Block A, ITL Building, Gangwu Road, Xi’an, China