the powder metallurgical standard
TRANSCRIPT
CPPUPLUS (1.2379PLUS / D2PLUS)
THE POWDER METALLURGICAL STANDARD
SPECIAL STEELSANY STEEL. ANY TIME. E
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HOT PRESSED AND COMPACTED
Due to the high carbon and chromium content, CPPU (1.2379 / D2) forms coarse
carbides which are distributed in a network. Subsequent hot forming stretches the
carbide network in the forming direction, so that the forged ingot has a carbide
banding. Although the coarse carbides promote wear resistance, they reduce the
toughness, the machinability and the polishability of the material.
The modern way of powder metallurgy solves this problem. Here, the molten steel is
atomized to form a fine powder, thus preventing the formation of a coarse carbides.
Subsequent hot isostatic pressing (HIP) combines the individual powder particles to
form a solid body. The powder metallurgical cold work steel CPPUPLUS (1.2379PLUS /
D2PLUS) produced in this way has fine and dispersed carbides and therefore exhibits
better toughness, machinability and polishability.
ADVANTAGES THROUGH POWDER
METALLURGY
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CPPU (1.2379 / D2) CPPUPLUS (1.2379PLUS / D2PLUS)
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EASY MACHINING, GRINDING, AND
POLISHING
LESS TOOL WEAR DURING MACHINING
The high carbide volume of CPPU (1.2379 / D2) is particularly noticeable in the core
area of the raw material during machining. Due to the accumulation of hard eutectic
chromium carbides, there is high abrasive wear on the cutting tool during machining.
Even at low cutting speeds, high crater and flank wear must be expected. Chipping on
the cutting tools also occurs more frequently. Adjusting the machining parameters,
such as rake angle, inclination angle, cutting speed and width of cut, only lead to
limited improvements in the service life of the cutting tools.
Regarding machining, the powder metallurgical version CPPUPLUS (1.2379PLUS /
D2PLUS) shows many advantages. Due to the homogeneous microstructure and the
finer eutectic chromium carbides, the material has significantly better machinability,
grindability and polishability. As a result, the material can be machined more
economically in both soft and hard machining.
CPPU (1.2379 / D2) CPPUPLUS (1.2379PLUS / D2PLUS)
HIGH DIMENSIONAL STABILITY
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EASY HEAT TREATMENT WITH LESS DISTORTION AND LOW CRACK RISK
"What isn’t crooked isn’t hard either!" This old saying makes it clear that there is
always a risk associated with heat treatment of steels. Distortion and cracks are the
most frequent problems and particularly common with carbide rich steels such as
CPPU (1.2379 / D2). Due to the carbide and segregation banding, the conventional
steel grade has a higher dimensional change in the longitudinal direction than in the
width or thickness direction during heat treatment. In addition, the material has an
higher risk of cracking due to the pronounced carbide lines. With the powder
metallurgical grade CPPUPLUS (1.2379PLUS / D2PLUS), both distortion and the risk of
cracks are significantly reduced due to the homogeneous microstructure. In general,
there is a lower risk during heat treatment using CPPUPLUS (1.2379PLUS / D2PLUS).
Position and forming direction of the
raw material.
Carbide banding and dimensional
changes during heat treatment of
conventional steels.
Dimensional changes during heat
treatment of powder metallurgical steels.
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IMPROVED IMPACT TOUGHNESS
FOR HIGHLY STRESSED TOOLS
The homogeneous microstructure of the powder metallurgical CPPUPLUS (1.2379PLUS /
D2PLUS) provides a high toughness potential. Irrespective of the position in the raw
material block, high impact toughness can be achieved after appropriate heat
treatment. If the conventional CPPU (1.2379 / D2) reaches only 5 J at 60-62 HRC in
transverse direction, values of over 15 J can be set for the CPPUPLUS (1.2379PLUS /
D2PLUS).
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ADVANTAGES FOR PLASTICS
PROCESSING
FOR EXTRUSION AND FOR INJECTION MOLDING
Modern extruders operate at high process pressures. Many components made of
CPPU (1.2379 / D2) tend to crack. The CPPUPLUS (1.2379PLUS / D2PLUS) offers
advantages in terms of better toughness and a lower risk of cracking.
Calibrators for plastic profiles should have good wear resistance and polishability. The
conventional CPPU (1.2379 / D2) often fails due to its poor polishability. This gap is
closed by CPPUPLUS (1.2379PLUS / D2PLUS), which is easier to polish due to its
homogeneous microstructure.
Injection molds are also exposed to abrasive wear due to reinforcement fibers. At the
same time, they must be polished to a high gloss and must have sufficient toughness.
The advantages of the CPPUPLUS (1.2379PLUS / D2PLUS) can be fully exploited here.
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BENEFITS FOR COLD WORK
FOR CUTTING, PUNCHING, PRESSING, AND FORMING TOOLS
The powder metallurgical grade CPPUPLUS (1.2379PLUS / D2PLUS) also offers
advantages over the conventional CPPU (1.2379 / D2) in classic cold work.
In sheet metal processing, the higher toughness is not only noticeable in terms of
greater shock resistance. It also significantly improves edge strength, which has a
positive effect on the service life of cutting and forming tools. Thread rolling rolls and
dies also benefit from the higher toughness of CPPUPLUS (1.2379PLUS / D2PLUS).
Tools used for powder compaction are often subject to high tensile stresses in
addition to wear. High toughness with high hardness offers more safety here.
Therefore, CPPUPLUS (1.2379PLUS / D2PLUS) is also the best choice for such
applications.
Dörrenberg Edelstahl GmbH
P. O. Box 2164
51758 Engelskirchen
Phone: +49 2263 79-0
Fax: +49 2263 79-205
www.doerrenberg.de
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