Since 1961
Italy
A wide service centers network providing you technological equipment, spare parts, technical support, inspections, repairs and operating and training services for the steel industry
 
 
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  DanCut550 knives
for quenched
bars to perform
up to
7 times

fewer knife changes.
   
  DanCut710:
high-performance
knives

for slab cutting
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  Long and Flat Products
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  DanCut: Danieli shear blades
added-value consumables
 
Danieli knives exploit the best characteristics of hot and cold special tool steels resulting in extended lifetime (fewer stops, less maintemance) as well as better cut quality in casting and rolling operations.
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  The shear blade, as a unique component of the machine that comes into contact with the rolled material, is responsible for the transmission of the shearing load generated by the machine and for performing the cut. Its purpose is not only represented by its ability to execute the cut, but also by its capacity for repeating this task over the longest time possible without significant decrease in cutting quality. Furthermore, the shear blade has to be able to withstand very high shearing loads represented in the form of compressive forces, such as in its impact with the rolled materials and elevated thermal shocks, without suffering cutting edge deformations, cracking or chip-off phenomena. The final performances of a shearing blade depends on the correct steel grade definition, its manufacturing process and the final heat treatment, and represent an important factor for the final productivity of the rolling mill in terms of forced production breaks for shear blade changing and of quality of the cut surfaces.
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  Left
DanCut550 knives for quenched bars to perform up to seven times fewer knife changes by Emirates Steel Industries (UAE).

Right
DanCut710 for hot slab cutting in continuous casting and hot rolling lines. It is the only one that allows the Customer to exploit its shear blades without major problems like excessive cracks that might lead to shear blade breakdown, and allows to perform multiple regrinding in order to maximize the blades lifetime performances.
 
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placeholder1px > DanCut550 knives <
  for quenched bars to perform
up to 7 times fewer knife changes.
On-field experience results.
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  Thanks to Danieli Service continuous investment into research & development of DanCut products, Danieli Service recently introduced a revolutionary material capable of significant performance improvements with the flying shears used for quenched and tempered bars cutting. This shears have to cut bars that on their surface present cold material properties (around 200°C) while the core is still hot (650°C), and this means that the same blade has to be able to shear together both physical states. Before the introduction of the new DanCut550 special steel grade there were two main philosophies for material selection on such application. One school of thought utilizes hot working tool steels (similar to DanCut510) which unfortunately have an unsatisfactory wear -resistance and hardness for cutting the external surface of the bar, and the shear blade cutting edge gets often knicked and deformed. The second school of thought utilizes the standard cold working tool steels (similar to DanCut330) that present a better wear rate but unfortunately are often subjected to surface cracking and chip-off phenomena mainly due to insufficient material toughness and incapability to withstand thermal shocks. With the introduction of DanCut550 steel grade these unwanted effects affecting the shear blades have been solved and the lifetime performances has been improved by achieving the correct cutting edge wearing.
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  Left
Detail of the 3- knife cutting shear placed after the QTB lines and before the high-speed Twin Channel system for bar delivery on cooling bed.

Right
View of the on-line water quenching and self-tempering section of Danieli rebars rolling mill.
 
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  DanCut550 is a patented special steel grade obtained from an unconventional melting process and is characterized by a superior toughness combined together with an elevated wear resistance characteristic, an uncommon final hardness (superior to any other kind of similar steel grade) and a high thermal shock resistance (very similar to the best heatresisting hot working tool steels). The combination of these properties provides to DanCut550 the capability for both hot and cold material cutting. From the tests performed on-site together with Danieli customers on standard material and DanCut550 we have obtained the following results:
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placeholder Test 1 (*) Customer: Hadeed, KSA
  Rolled material 25 mm QTB (600-650 °C)
  Original standard blades 2,400 cuts
  DanCut550 test blades 6,900 cuts
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  Rolled material 32 mm QTB (600-650 °C)
  Original standard blades 1,410 cuts
  DanCut550 test blades 4,048 cuts
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  Rolled material 16 mm - QTB (600-650 °C)
  Original standard blades 62,131 cuts
  DanCut550 test blades 422,012 cuts
  (*) Danieli drum shear
with 3-blade set
 
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Standard blade after 62,131 CVR shear cuts on ø16 - the cutting edge is deeply worn-out.

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DanCut550 blade after 301,403 CVR shear cuts on ø16 - no chip-off present on the cutting edge and no deep wear out. The blade has worn correctly, with only the cutting edge losing its sharpness.

 
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  These results were obtained by testing both materials in the same working conditions considering shear setting parameters, shear wear-out state and rolled material steel grade, dimension and temperatures. The performance difference between those steel grades in first place is given by the toughness difference. Standard blade material is more fragile and subjected to chip-off, so its cutting edge wears out mainly due to small portion of material detachment. This sort of phenomena increases the gap between the blades reducing the cutting quality and forcing the customer to remove the blade from service prematurely. This phenomena can be clearly seen in picture above.
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  > DanCut710 <
  high-performance knives for slab cutting.
 
       
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  Another remarkable achievement can be obtained by the application of DanCut710 blades on the thin slab cutting pendulum shear. This shear is used to cut up to 110 mm thick slabs at a temperature between 800 and 1100°C. The combination of high thickness and temperature together with slow cutting speed, heat radiation and limited distance between the slab and the blades in rest position, requires a material capable of withstanding high amounts of heat and yet maintain its mechanical properties at elevated temperatures. For such applications, Danieli has introduced DanCut710 special alloy which is a Ni-Cr creep-resisting alloy capable of withstanding those extremely heavy working conditions and characterized by very high toughness and wear resistance also at elevated working temperatures. Among all available steel grades, DanCut710 is the only one that allows the customer to exploit its shear blades without major problems like excessive cracks that lead to shear blade breakdown, and allows multiple regrinding in order to maximize the blades lifetime performances.
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  Sample of DanCut710 tensile test after specific precipitation hardening heat treatment.
 
   
  According to Danieli’s philosophy for continuous research and development of new shearing solutions, our engineering team is developing new improvements for special applications like the high-speed shears in endless rolling hot strip mills, as well as for improving standard hot and cold cutting applications for high gauges and special steels. This kind of philosophy and continuous innovation make the Danieli DanCut product line a reliable source for high-quality and technologically advanced spare parts.
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  Download technical card (pdf file)
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placeholder1px English version
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placeholder1px Russian version
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  "Danieli Service Info" bulletin previous issue
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Contact us
 
TheReliableInnovativeTeam Danieli Service Headquarters
Via Nazionale, 41
33042 Buttrio (UD) Italy
Tel (39) 0432.1958729
Fax (39) 0432.1958736
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