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PMM-4 Powder Metal Products
POWDER METAL M4
HIGH SPEED STEEL
ANALYSIS
C |
MN |
S |
SI |
CR |
W |
MO |
V |
1.45 |
0.25 |
0.008 |
0.25 |
4.50 |
5.50 |
4.50 |
3.85 |
SIZE AVAILABILITY
Flats - Rounds - Squares - Hollowbar
Standard Sizes - Non-Standard Sizes - Metric Sizes
Powder Metal M4 high speed steel is an extremely versatile high speed steel which provides a unique combination of high wear resistance with high impact toughness and transverse bend strength. A large volume of vanadium carbides provides the high wear resistance. The high impact toughness and high transverse bend strength are results of the fine grain size, small carbides, and superior cleanliness of the powder metallurgy (PM) microstructure. Powder Metal M4 offers improved cutting tool life compared to conventionally wrought M1, M2, M7 and other lower-alloyed high speed steels. Powder Metal M4 also excels in cold work tooling applications where it provides better toughness and wear resistance than high-carbon, high-chromium die steels such as D2 and D3.
PM M4 HEAT TREATING INSRUCTIONS
Hardening
Preheating: 1500-1550°F, equalize. A second preheat at 1850-1900°F is recommended for vacuum hardening.
Critical Temperature: Acl: 1545°F
Austenitizing (High Heat): Heat rapidly from the preheat.
For Cutting Tools: Soak for 5 to 15 minutes; Furnace: 2150-2200°F; Salt Bath: 2125-2175°F
For Cold Work Tooling: Soak for 20 to 45 minutes; Furnace: 1875-2125°F; Salt Bath: 1850-2100°F
Quenching: Pressurized gas, warm oil, or salt. For pressurized gas quenching the quench rate to below 1000°F is critical to obtain the desired properties
For oil, quench until black, about 900°F, then cool in still air to 150-125°F.
For salt maintained at 1000-1100°F, equalize in the salt, then cool in still air to 150-125°F.
As Oil Quenched from |
HRC |
1900°F, 45 minutes |
60 |
2000°F,20 minutes |
63 |
2100°F,15 minutes |
65 |
2200°F,5 minutes |
63 |
Tempering: Temper immediately after quenching. Typical temperature range is 1000-1100°F. Do not temper below 1000°F. Hold at temperature for 2 hours then air cool to ambient temperature. Double tempering is required. Triple tempering is required when austenitized at 2100°F or higher.
Oil Quenched from 1900°F, 45 minutes |
|
Oil Quenched from 2200°F, 5 minutes |
Tempering Temp °F |
HRC |
Tempering Temp °F |
HRC |
1000 |
59 |
1000 |
66 |
1050 |
58 |
1050 |
65 |
1100 |
55 |
1100 |
62.5 |
1150 |
51 |
1150 |
59 |
1200 |
45 |
1200 |
55 |
Annealing
Annealing must be performed after hot working and before re-hardening. Heat at a rate not exceeding 400°F per hour to 15751600°F and hold at temperature for 1 hour per inch of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 50°F per hour to 1000°F. Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be a maximum of 255 HB.
Hot Hardness
Oil Quenched from 2200°F and triple tempered at 1025°F
Test Temperature |
HRC |
72°F |
65.5 |
600°F |
62 |
800°F |
60 |
1000°F |
57 |
1100°F |
54 |
1200°F |
44 |
1300°F |
20 |
The data presented herein are typical values and do not warrant suitability for any specific application or use of this material. Normal variations in the chemical composition, the size of the product, and heat treatment parameters may result in different values for the various physical and mechanical properties. Data is typical and should not be construed as actual values for any catagory.
Applications and technical information require engineers and tool designers to exercise independent judgement. |