High Speed
Tool Steel
|
Gateway M-2 is a tungsten-molybdenum high speed tool steel. It has a
wider heat treat range than most of the high speed steels, and has a resistance
to
decarburazation. It offers an excellent combination of good red hardness, toughness
and wear resistance. |
|
Typical Chemistry
|
Carbon
|
0.85
|
Chromium
|
4.00
|
| |
Manganese
|
0.30
|
Vanadium
|
2.00
|
| |
Silicon
|
0.30
|
Molybdenum
|
5.00
|
| |
Tungsten
|
6.00
|
Phosphorus
|
.030 max
|
| |
|
|
Sulfur
|
.030 max
|
Applications
|
Gateway M-2 is suitable for use in high speed tooling applications
requiring a combination of good
red hardness, toughness and wear resistance. Typical applications include
drills, taps, punches, reamers, broaches, planer knives, lathe tools,
form cutters, milling cutters, end mills and
gear cutters. |
Annealing
|
Heat slowly to 1600 F, and hold for uniformity, cool at a
rate of 30 F per hour to 900 F, thenair cool. Expected BHN 241 max. |
Heat Treating
|
Preheat slowly to
1550 F, soak until uniformly heated, and heat rapidly to 2250 F-2250F.
Heating vary from a few minutes to a maximum of 15 minutes, depending
on the size of the tool. Cool in air, oil or a molten salt bath operating
at 1000 F-1100 F. In case of oil quenching, it is usually good practice
to interrupt the quench by removing the tool after it has reached about
1000 F, and allow the cooling to continue in still air. Tools should
be allowed to cool to 150 F, or when they can be held by the bare hand
and then tempered immediately. |
Tempering
|
A tempering range
of 1000 F - 1050 F is recommended. Parts should be held a minimum of
2 hours per inch of thickness. Double tempering is recommended. The following
tempering table may be used as a guide. 1" dia specimens were used
for this test, it may be found that heavier sections are several points
lower. Table is based on 2250 F hardening temperature. |
| |
|
|
|
Tempering Temperature (F)
|
Oil Quenched
Hardness (hrc)
|
Air Quenched
Hardness (hrc)
|
|
300
|
65.0
|
65.0
|
|
400
|
64.0
|
63.0
|
|
500
|
63.0
|
62.5
|
|
600
|
62.5
|
62.5
|
|
700
|
63.0
|
62.5 '
|
|
800
|
63.5
|
63.5
|
|
850
|
63.5
|
63.5
|
|
900
|
65.0
|
64.0
|
|
950
|
66.0
|
65.0
|
|
1000
|
66.0
|
65.5
|
|
1050
|
66.0
|
63.5
|
|
1100
|
64.5
|
61.5
|
|
1150
|
62.0
|
60.0
|
|
1200
|
53.5
|
53.0
|
|
1300
|
43.0
|
39.5
|
|
Note: Variations
in section size, heating rate, soak time, quench rate and tempering
will cause deviations from the above values. Gateway Metals should
be consulted for specific applications. |
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