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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 T-15 High Speed Steel Data Sheet
PM T-15 is a tungsten type super high speed steel containing high vanadium for excellent abrasion resistance and cobalt for good red hardness. PM T-15 is ideal for cutting difficult to machine materials where high frictional heat is present.
Chemical Composition
| Carbon | 1.60% |
| Manganese | 0.30% |
| Chromium | 4.00% |
| Cobalt | 5.00% |
| Vanadium | 4.90% |
| Tungsten | 12.00% |
| Silicon | 0.30% |
| Sulfur | 0.06% |
Typical Applications
| Broaches | Milling Cutters |
| Gear Hobs | Spade Drills |
| Taps | End Mills |
| Shaper Cutters |
Thermal Treatments
Preheat : 1500/1550F (820/845C), equalize, Second preheating stage at 1800/1850F (1010/1040C)recommended for vacuum or atmosphere hardening. equalize.
Austenize : 2125/2250F (1165/1235C), 30/45 minutes at temperature. Standard recommendation to achieve RC 66-68 after tempering is to use 2225/2250F (1220/1235C)
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. Triple tempering is required if austenizing at 2000F (1095C) or above.
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
|
2125F
|
2150F
|
2175F
|
2200F
|
2225F
|
2250F
|
|
°C
|
°F
|
(1165C)
|
(1180C)
|
(1190C)
|
(1205C)
|
(1220C)
|
(1235C)
|
|
|
As Quenched
|
67
|
66.5
|
66
|
65.5
|
64.5
|
64
|
|
540
|
1000
|
65
|
65.5
|
66
|
66.5
|
67
|
67.5
|
|
OPTIMUM FOR MAXIMUM TOUGHNESS AND EFFECTIVE STRESS-RELIEVING.
|
|
550
|
1025
|
64.5
|
65
|
65.5
|
66
|
66.5
|
67
|
|
565
|
1050
|
64
|
64.5
|
65
|
65.5
|
66
|
66.5
|
|
595
|
1100
|
62
|
62.5
|
63
|
63.5
|
64
|
64.5
|
|
620
|
1150
|
57
|
58.5
|
59.5
|
60.5
|
61
|
61.5
|
|
650
|
1200
|
54
|
55
|
56
|
57
|
57.5
|
58
|
|
|
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
|
10
|
5
|
5
|
5
|
MINIMUM NUMBER
OF TEMPERS (2 HRS)
|
3
|
3
|
3
|
3
|
3
|
3
|
Surface Treatments
PM T-15 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: 245/275 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 PM T-15 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) | (221 GPa) |
| Density | 0.296 lb/in3 | (8193 kg/M3) |
| Thermal Conductivity | 11.5 BTU/hr./ft./F | 19 W/m/ °K) |
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