M2 Steel Composition | M2 tool steel | M2 tool steel properties | Tool

M2 tool steel |M2 Steel Composition|

M2 tool steel properties | Tool

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WHAT IS M2 TOOL STEEL?

M2 tool-steel is a general purpose molybdenum high

speed steel.

This grade is characterized by balanced combination of abrasion resistance, toughness and good red hardness.

Due to its comparatively low carbon content,

M2 tool-steel has an excellent combination of toughness properties and abrasion resistance,

when properly hardened and tempered.

Grade m2 high speed steel is by using far the maximum popular high speed steel replacing high speed steel grade t1 in most programs.

AISI- M2 steel

Class High speed steel
Type Tool steel
Category Molybdenum High speed steel
Grades U.S ASTM A600, SAE J437, SAE J438, AISI M2
Germany DIN 1.3343
U.K B.S, BM2
Availability In Stock

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WHAT ARE THE APPLICATIONS OF THE M2 TOOL STEEL?

The application of the m2 tool-steel is as follows:-

  • widely used in all kinds of cutting tools
  • knife and punches
  • die applications.

Ordinary programs for m2 high speed steel are broaching tools, reamers, twist drills, faucets, metal saws, milling tools. M2 is appropriate for cold forming tool which includes extrusion rams and dies. Additionally widely utilized in all styles of cutting tool ,die applications and knife and punches. Plastic moulds with expanded put on resistance and screws.

The primary use of high-speed steels is still within the manufacture of numerous cutting tools.

WHAT IS THE M2 STEEL COMPOSITION?

The M2 steel composition is as follows:-

AISI M2 Steel Composition
Elements Weight in %
Carbon 0.78-1.05
Chromium 3.75-4.50
Tungsten 5.50-6.75
Molybdenum 4.50-5.50
Vanadium 1.75-2.20
Iron Balance
Silicon 0.20-0.45
Sulphor 0.30 max
Phosphorus 0.30 max
Manganese 0.15-0.40

WHAT ARE THE PHYSICAL PROPERTIES OF M2 TOOL STEEL?

The physical properties of the m2 tool-steel is as follows :-

Density 0.294 lb/in3 (8138 kg/m3)
Specific Gravity 8.15
Modulus of Elasticity 0.294 lb/in3 (8138 kg/m3)
Thermal conductivity 24 Btu/ft/hr/°F 41.5 W/m/°K
Machinability 65% of a 1% carbon steel

WHAT IS THE COEFFICIENT OF THERMAL EXPANSION 65HRC?

The coefficient of thermal expansion 65 hrc is as follows :-

Coefficient Of Thermal Expansion 65HRC
Temperature ºF in/inºF x106 Temperature ºC mm/mmºCx106
70-200 5.69 21-93 12.00
70-400 6.09 21-204 12.90
70-600 6.42 21-316 13.70
70-800 6.70 21-428 12.00
70-1000 6.97 21-358 12.55

WHAT IS THE VARIOUS STEPS FOR MAKING M2 TOOL STEEL BETTER?

There are 5 various steps for making M2 tool-steel better :-

  • HEAT TREATENING.
  • TEMPERING.
  • QUENCHING.
  • ANNEAKING.
  • STRESS RELEAVING.

HEAT TREATMENT :-

Preheat at 1450 F before heating for hardening.

Then heat rapidly from 1450 F to 2200 F and hold for 3 to 5 minutes followed by quenching in oil, air or salt bath.

TEMPERING :-

Double tempering is mandatory. Temper at 560°C/1040°F for a hardness of Rockwell C 60 to 65.

For hardness, strength and toughness the best tempering range is 1000 to 1050° F.

QUENCHING :-

Quenching to about 550°C / 1022°F then air cooling down to room temperature.

After equalizing withdraw parts from the air cooled and warm salt to 150° F.

ANNEALING :-

  • Soft annealing at 850 ° C – 900 ° C / 1560 ° F – 1650 ° F temperature,
  • slow cooling 10 ° C / 18 ° F / h to 700 ° C / 1290 ° F, maximum 260 Brinell hardness.

STRESS RELIEVING :-

Stress relieving For 600 ° C – 700 ° C / 1120 ° F – 1290 ° F, approx. 2 hours at temperature, slow cool cooling to 500 ° C / 930 ° F.

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