M-42 (1.3247) High speed steel

Specification

M42 high speed steel is a premium cobalt high speed steel with a chemical composition designed for high hardness and superior hot hardness. These properties make the steel an excellent choice for machining high-strength and pre-hardened steels, high-hardness alloys, and the difficult-to-machine, nonferrous super alloys used in the aerospace, oil, and power generation industries.
HSS M42 steel exhibits excellent wear resistance by virtue of high heat-treated hardness (68 to 70 HRC), and the high cobalt content imparts the hot hardness. As such, the cutting edges on tools made from high speed steel stay sharp and hard in heavy-duty and high-production cutting applications.

Application

For complicated and accurate cutting tools for hard and high speed cutting, bandsaw blades, cutting tools including twist drills, taps, broaches tools, milling cutters, reamers, end mills, knifes, thread rolling dies.

Chemical Analysis %

C	Mn	Cr	Si	Mo	V	W	CO	P	S
1.05-1.15	0.15-0.40	3.50-4.25	0.15-0.65	9.0-10.0	0.95-1.35	1.15-1.85	7.75-8.75	0.030 Max	0.030 Max

Delivery condition
Annealed 269 HB MAX
Heat Treatment

Soft Annealing	Stress-relief annealing	1st preheating	2nd and 3rd preheating	Cooling	Hardness	Hardening	Quenching	tempering	Hardness after quenching HRC
790-840°C	600-650°C	850°approx in an air-circulating furnace	850°C 850-1050°C	Furnace	269HB	1170-1190°C	Air, Oil, thermal bath,550°C	At least three times 540-570°C	64-68

Tempering °C

Tempering°C	300	400	500	600	650
HRC	61	61	66	64	50