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M42

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HSS M42 block

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Specifications

Molybdenum high-speed steels and tungsten high-speed steels are two types of high-speed tool steels. Molybdenum high-speed steels, also known as group M steels, comprise less initial cost. Molybdenum steel types M1 to M10 have tungsten whereas cobalt is not found in type M6. Cobalt is totally absent in these types of molybdenum high-speed steels.

M42 tool steel, a type of molybdenum high speed tool steel, has good wear resistance and hot hardness along with high hardness values.


Applications:

M42 tool steel is mostly used for machine materials and super alloys that are difficult to machine. The machine materials include chasers, broaches, form and gear cutters, hobs, drills, milling cutters, end mills and taps.


Quick Detail: M42 BLOCK, BLOCK


COMPOSITION

        C       Si       Cr
       W
      Mo
        V
       Co
      1.08      0.45
      3.85
     1.50
     9.50
      1.20
      8.00


RELATIVE PROPERTIES

HEAT TREATING INSTRUCTIONS: HARDENING

HARDENING
CRITICAL TEMPERATURE:
Ac1: 1560°F(849℃)


Preheating: Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1500-1600°F (816-871°C), and equalize.


Austenitizing (High Heat): Heat rapidly from the preheat.

Furnace: 2150-2175°F (1177-1191°C)

Salt: 2125-2150°F (1163-1177°C)

To maximize toughness, use the lowest temperature.

To maximize hot hardness, use the highest temperature.


Quenching: Pressurized gas, warm oil, or salt. For pressurized gas, a rapid quench rate to below 1000°F

(538°C) is critical to obtain the desired properties. 

For oil, quench until black, about 900°F (482°C), then cool in still air to 150 -125°F (66-51°C).

For salt maintained at 1000-1100°F (538-593°C), equalize, then cool in still air to 150 -125°F (66-51°C).


Tempering: Temper immediately after quenching. Typical tempering range is 950-1050°F (510-566°C). Hold at temperature for 2 hours, then air cool to ambient temperature. Triple tempering is required.


ItemDimension (mm)ProcessDelivery condition
BlockT 20-200 X 300-800Hot Rolled & Hot ForgedBlack surface /Machine & Anneal



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