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

 

 

 
 

PM M-4 High Speed Steel Data Sheet

PM M-4 is a high-vanadium special purpose high speed steel exhibiting better wear resistance and toughness than M2 and M3 in cold work punches, die inserts and cutting applications involving high speed and light cuts.


Chemical Composition

Carbon 1.40%
Manganese 0.30%
Chromium 4.00%
Molybdenum 5.25%
Vanadium 4.00%
Tungsten 5.50%
Silicon0.55%
Sulfur0.06%

Typical Applications

BroachesMilling Cutters
Gear HobsRolls
Shaper CuttersPunches
Powder Compaction Punches


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 : 1850/2150F (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 2000F (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
 

1850F

1900F

1950F

2050F

2100F

2150F

C
 

F
 

(1025C)

(1040C)

(1065C)

(1120C)

(1150C)

(1175C)


As Quenched

61

63

65

65

64.5

63.5

540

1000

56

57

60.5

62

63

64

OPTIMUM FOR MAXIMUM TOUGHNESS AND EFFECTIVE STRESS-RELIEVING.

550

1025

54

56

58.5

60

62

63

565

1050

52

54

56.5

58

60

61

595

1100

49

51

52

54

55

56

620

1150

44

45

46

48

50

51

650

1200

40

41

43

46

47

48


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

MINIMUM NUMBER
OF TEMPERS (2 HRS)
 

2

2

2

3

3

3


Surface Treatments

PM M-4 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: 225/255 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 PM M-4 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 Elasticity31psix10(6)(221 GPa)
Density0.288 lb/in3(7972 kg/M3)
Thermal Conductivity12.1 BTU/hr./ft./F21 W/m/ K)

back to products

 

  [Home] [Company] [Products]  [Newsletter] [Technical]