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Eastern
Tool
Steel Service, Inc.
1045 Delaum Rd.
P.O.
Box 857
St.
Marys, Pa 15857
Phone:
(814) 834-7224
Fax:
(814) 834-7225
Or
Contact Us
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M-2 High Speed Steel Data Sheet
M-2 is a general purpose molybdenum-type high speed steel exhibiting well-balanced toughness, wear resistance and red hardness properties. This grade is commonly used in cold work punches and dies and cutting applications involving high speed and light cuts.
Chemical Composition
| Carbon | 0.85% |
| Manganese | 0.28% |
| Chromium | 4.15% |
| Molybdenum | 5.00% |
| Vanadium | 1.85% |
| Tungsten | 6.15% |
| Silicon | 0.30% |
Typical Applications
| Broaches | Milling Cutters |
| Drill Bits | Pins |
| Reamers | Punches |
| Powder Compaction Pins |
Thermal Treatments
Preheat : 1450/1500F (820/845C), equalize, Second preheating stage at 1850/1900F (1010/1040C)recommended for vacuum or atmosphere hardening. equalize.
Austenize : 1950/2225F (1010/1175C), 30/45 minutes at temperature. Standard recommendation to achieve RC 60-62 after tempering is to use 2050F (1120C)
Quench : Salt, oil or atmosphere quench to 1000-1100F(540-595C), equalize, then air cool to below 125F(50C) or hand warm. Vacuum or atmosphere quench rate through 1850-1300F(1010-705C) range is critical to achieve optimum heat treat results.
Temper : 1000F (540C) minimum, hold 2 hours at temperature, air cool. Temper twice minimum. Triple tempering is recommended if austenizing at 2100F (1095C)
Cryogenic Treating : Refrigeration treatments may improve long term dimensional stability by transforming retained austenite. Refrigeration treatments should generally be performed after the first temper, and must be followed by a temper.
Hardening Data
|
Temperature
|
1950F
|
2000F
|
2050F
|
2100F
|
2150F
|
2200F
|
|
°C
|
°F
|
(1065C)
|
(1095C)
|
(1120C)
|
(1150C)
|
(1175C)
|
(1205C)
|
|
|
As Quenched
|
62
|
63
|
64
|
65
|
65
|
66
|
|
540
|
1000
|
60
|
61
|
62
|
63
|
64
|
65
|
|
OPTIMUM FOR MAXIMUM TOUGHNESS AND EFFECTIVE STRESS-RELIEVING.
|
|
550
|
1025
|
59
|
60
|
62
|
63
|
64
|
65
|
|
565
|
1050
|
59
|
60
|
61
|
62
|
63.5
|
64
|
|
595
|
1100
|
57
|
59
|
60
|
61
|
62
|
63
|
|
610
|
1125
|
55
|
57
|
58
|
58.5
|
60
|
61
|
|
620
|
1150
|
53
|
54
|
55.5
|
57
|
58
|
59
|
|
|
NOTE A:
|
RESULTS MAY VARY WITH HARDENING METHOD AND SECTION SIZE. SALT OR OIL
QUENCHING WILL GIVE MAXIMUM RESPONSE. VACUUM OR ATMOSPHERE COOLING MAY
RESULT IN UP TO 1-2 HRC POINTS LOWER. |
MINIMUM TIME AT
AUST TEMP (MINS)
|
60
|
45
|
30
|
20
|
15
|
10
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MINIMUM NUMBER
OF TEMPERS (2 HRS)
|
2
|
2
|
2
|
3
|
3
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3
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Surface Treatments
M-2 can be nitrided, steam tempered or titanium-nitride coated if desired. If the CVD TiN treatment is used, care is required in vacuum hardening.
Annealing
Heat to 1600F (870C), hold 2 hours, slow cool 30F (15C)/hour maximum) to 1000F (540C), then furnace or air cool.
Typical annealed hardness: 217/255 BHN.
Stress Relieving
Annealed Material: Heat to 1100/1300F(595/740C), hold two hours, cool in still air.
Hardened Material: Heat to 25F(15C) below original tempering temperature, hold two hours, cool in still air.
Welding
Welding of M-2 is generally not recommended. If weld repair must be performed, use air hardening tool steel filler material.
Annealed Material: Preheat 1000/1100F(540/595C), maintain over 1000F(540C) during welding. Reanneal or temper 1550F(845C) 6 hours after welding.
Hardened Material: Preheat to 25F(15C) below original tempering temperature (1000F(540C) minimum). Maintain above 900F(480C) during welding. Cool to 150F(65C) after welding. Temper 25F(15C) below original tempering temperature. Minimum 1000F(540C)
Physical Properties
| Modulus of Elasticity | 31psix10(6) | (221 GPa) |
| Density | 0.288 lb/in3 | (7972 kg/M3) |
| Thermal Conductivity | 12.1 BTU/hr./ft./F | 21 W/m/ °K) |
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