Eastern Tool
Steel Service, Inc.

1045 Delaum Rd.

P.O. Box 857

St. Marys, Pa 15857

Phone: (814) 834-7224
Fax: (814) 834-7225
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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


High Speed Steel Comparison Chart

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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