AISI M2
AISI M2
M2 is a tungsten-molybdenum high speed steel and is a popular grade for general purpose applications. It has a wider heat treating range than most of the molybdenum high speed steels, coupled with a resistance t decarburization that is characteristic of tungsten types. M2 offers an excellent combination of red hardness, toughness, and wear resistance.
TYPICAL APPLICATIONS
Drills, taps, end mills, reamers, milling cutters, hobs, form tools, saws, lathe and planer tools, chasers, broaches and boring tools.
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TYPICAL ANALYSIS
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Type M2 (T11302)
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Carbon
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.78 - .88
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Manganese
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.15 - .88
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Silicon
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.20 - .45
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Tungsten
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5.50 – 6.75
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Molybdenum
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4.50 – 5.50
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Chromium
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3.75 – 4.50
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Vanadium
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1.75 – 2.20
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Nickel
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.30 MAX
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FORGING
Start forging at
Do not forge below
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1900-2100° F (1038-1149° C)
1700° F (927° C)
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NORMALIZING
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Do not normalize
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ANNEALING
Temperature
Rate of cooling, max. per hour
Typical annealed hardness, Brinell
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1600-1650° F (871-899° C)
40° F (22° C)
212-241
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HARDENING
Rate of heating
Preheat temperature
Hardening temperature
Tine at temperature, minutes
Quenching medium
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Rapidly from preheat
1350-1550° F (732-843° C)
2175-2250° F (1191-1232° C)
2-5
O, A or S
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TEMPERING
Tempering temperature
Approx. tempered hardness, Rockwell C
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1000-1100° F (538-593° C)
60-65
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WEAR RESISTANCE
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Very High
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TOUGHNESS
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Low
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RESISTANCE TO SOFTENING EFFECT OF ELEVATED TEMPERATURE
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Very High
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DEPTH OF HARDENING
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Deep
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MACHINABILITY
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Medium
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GRINDABILITY
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Low
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DISTORTION IN HEAT TREATING
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A or S: Low/ O: Medium
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SAFETY IN HARDENING
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Medium
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RESISTANCE TO DECARBURIZATION
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High
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