|
|
|
CPM 9V
|
|
|
| Powder
Metal |
CPM 9V is an air-hardening, powder metal
tool steel that provides very |
| Tool
Steel |
high
wear resistance in combination with high impact toughness. A large volume of hard |
|
vanadium carbides provides the high
wear resistance. CPM 9V
contains less carbon |
|
and vanadium than CPM 10V,
which results in a lower obtainable hardness, slightly lower |
|
wear resistance, but a significant
increase in toughness. The lower
carbon content also enables |
|
CPM 9V to be used in warm and hot
work applications where resistance to thermal fatigue is |
|
important. |
|
| |
|
|
|
|
|
|
|
|
|
| Typical
Chemistry |
|
Carbon |
1.80 |
|
Chromium |
5.25 |
|
|
Manganese |
0.50 |
|
Vanadium |
9.00 |
|
|
Silicon |
0.90 |
|
Molybdenum |
1.35 |
|
| |
|
|
|
|
|
|
|
|
|
| Applications |
CPM 9V may be used in
unique tooling applications for improved toughness |
|
compared
to CPM 10V and high speed steels, and improved wear resistance compared
to |
|
Gateway
D2 and other tool steels. Duratech™ Nine is widely used for plastic injection feed |
|
screws, non-return valves, shear
blades, and forging dies. |
|
| |
|
|
|
|
|
|
|
|
|
| Annealing |
Annealing
must be performed after hot working and before rehardening. Heat at a rate not |
|
exceeding
400 F per hour to 1600-1650 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. |
|
| |
|
|
|
|
|
|
|
|
|
| Heat
Treating |
Preheat to 1500/1550 F,
equalize. |
|
|
Heat rapidly to the high heat from
the preheat. |
|
|
For optimum wear
resistance: |
Soak 5 to 15 minutes. |
|
|
|
|
Furnace or Salt Bath: |
2150 F |
|
|
For balance of wear &
toughness: |
Soak 15 to 30 minutes. |
|
|
|
|
|
Furnace or Salt Bath: |
2000 F |
|
|
For maximum toughness and |
|
|
|
|
|
minimum distortion: |
|
Soak for 30 to 60 minutes. |
|
|
|
|
Furnace: |
|
1900 F |
|
|
|
|
Salt Bath: |
|
1875 F |
|
|
Quenching: |
Pressurized gas, warm oil, or
salt. Sections less than 2-1/2"
tk may be air cooled |
|
to maximum hardness. Sections 2-1/2" tk or more must be
quenched at a faster rate, using one |
|
of the methods below, to
obtain maximum hardness. |
|
|
For pressurized gas, the
furnace should have a minimum quench pressure of 4 bars. The quench |
|
rate 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. |
| |
|
|
|
|
|
|
|
|
|
| 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 2050 F or |
|
higher. |
|
|
|
|
|
Note: |
See
your Gateway Metals representative to obtain specific heat treatment |
|
information
to obtain certain hardness readings for your specific application. 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. |
|
|
|
|
|
|
|
|
|
|
|
|
