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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.
M42 Steel Applications:
M42 steel can be used in conditions where the demand for hot hardness is important. Commonly used for cutting tools including twist drills, taps, broaches tools, milling cutters, reamers, end mills, bandsaw blades, cold work tools, and thread rolling dies.
PROPERTIES:
HSS M42 high speed steel is highly Cobalt alloyed. The composition of speed steel makes for a good combination of toughness and hardness. By virtue of these well-balanced properties M42 high speed steel has come into wide use for all cutting tools.
Characteristics:
All-round applicability
Good machine-ability
Good performance
Good hot hardness
Good wear resistance
All Grades Comparison:
|
AISI |
DIN |
AFNOR |
JIS |
UNS |
|
M42 |
DIN 1.3247 |
07-05-04-04-02 |
SKH59 |
T11342 |
M42 Steel Chemical Composition(%)
|
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
V |
W |
Co |
Cu |
|
1.05-1.15 |
0.15-0.65 |
0.15-0.40 |
0.030 max |
0.030 max |
3.50-4.25 |
0.3 max |
9.00-10.00 |
0.95-1.35 |
1.15-1.85 |
7.75-8.75 |
0.25 max |
METHODS OF MAKING TOOLS:
HSS high speed steel can be worked in the same way as other high-speed steels by plastic forming, machining, grinding, electrical discharge machining, welding and polishing. In grinding, local heating of the surface, which might alter the temper, must be avoided. Grinding wheel makers can furnish advice on the choice of grinding wheels. Machining is carried out using carbide or high speed steel tools.
Final Grinding
Select the correct grade of wheel in consultation with the grinding wheel manufacturer. Ensure the grinding wheel is in good condition by means of a suitable dressing tool. Wet grinding is a preferable option using a copious supply of coolant. If dry grinding is resorted to then use a very soft wheel.
