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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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PM M-48 High Speed Steel Data Sheet
PM M-48 is a tungsten type super high speed steel hardenable to RC 68-69. It contains high vanadium for excellent abrasion resistance and cobalt for excellent red hardness. PM M-48 is ideal for special purpose cutting tools requiring super high hardness and red hardness, excellent wear resistance and good toughness.
Chemical Composition
| Carbon |
1.50% |
| Molybdenum |
5.25% |
| Chromium |
3.75% |
| Cobalt |
8.50% |
| Vanadium |
3.10% |
| Tungsten |
9.75% |
| Sulfur |
0.07% |
Typical Applications
| Broaches |
|
Milling Cutters |
| Gear Hobs |
|
Tool Bits |
| Taps |
|
End Mills |
| Shaper Cutters |
|
High Hardness Forming Tools |
Thermal Treatments
Preheat : 1500/1550F (820/845C), equalize, Second preheating stage at 1800/1850F (1010/1040C)recommended for vacuum or atmosphere hardening. equalize.
Austenize : 2100/2200F (1150/1205C), 30/45 minutes at temperature. Standard recommendation to achieve RC 67-69 after tempering is to use 2150/2175F (1175/1190C)
Quench : Salt, oil or atmosphere quench to 1000-1100F(540-595C), equalize, then air cool to below 125F(50C) or hand warm. A fast quench rate from 1850 (1010C) through 1100F(595C) range is critical to achieve optimum heat treat results.
Temper : 1000F (540C) minimum, hold 2 hours at temperature, air cool. Triple tempering is required, quadruple tempering is recommended.
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
|
2100F
|
2125F
|
2150F
|
2175F
|
2200F
|
|
°C
|
°F
|
(1150C)
|
(1165C)
|
(1175C)
|
(1190C)
|
(1205C)
|
|
|
As Quenched
|
68
|
68
|
67
|
66.5
|
66.5
|
|
540
|
1000
|
67
|
67.5
|
68
|
68.5
|
69
|
|
OPTIMUM FOR MAXIMUM TOUGHNESS AND EFFECTIVE STRESS-RELIEVING.
|
|
550
|
1025
|
66.5
|
67
|
67.5
|
68
|
68.5
|
|
565
|
1050
|
65.5
|
66.5
|
67
|
67.5
|
68
|
|
595
|
1100
|
63
|
64
|
65
|
66
|
66.5
|
|
620
|
1150
|
59
|
60
|
61.5
|
63
|
64
|
|
650
|
1200
|
53
|
55
|
57
|
59
|
60
|
|
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)
|
10
|
10
|
5
|
5
|
3
|
MINIMUM NUMBER
OF TEMPERS (2 HRS)
|
3
|
3
|
3
|
4
|
4
|
Surface Treatments
PM M-48 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: 285/311 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, or 1000F (540C)minimum, hold two hours, cool in still air.
Welding
Welding of PM M-48 is generally not recommended due to the fine-grain microstructure produced by the PM process. 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) |
(214 GPa) |
| Density |
0.298 lb/in3 |
(8255 kg/M3) |
| Thermal Conductivity |
11.74 BTU/hr./ft./F |
19 W/m/ °K) |
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