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Overview: all advantages of precision steel strip

Hot rolled narrow strip from Hoesch Hohenlimburg offers you:

  • extraordinary tight tolerances similar to cold rolled strip
  • superior surface quality
  • uniform material properties
  • microstructures made for specific applications
  • optimum shaping properties even in higher strength steels
  • customised batch sizes

Applications Direct usage

For you as a direct user of steel strip your prerequisite is of high importance. Besides a wide range of grades and dimensions the usage of hot rolled narrow strip from Hoesch Hohenlimburg offers you the following advantages:

Advantages of the mill edge

  • the mill edge is rounded (slit strip = sharp edged)
  • the mill edge comes without burr and micro cracks (cannot be avoided by slit strip)
  • the mill edge has no embrittled work hardening (slit strip = even after an additional edge dressing work hardening may still remain)

Result:

  • leads to a higher fatigue resistance on dynamically stressed parts

Advantages of very tight thickness tolerances

Hot rolled narrow strip from Hoesch Hohenlimburg offers very tight thickness tolerances over the length as well as over the width of the strip due to the limited rolling width. This is necessary to be able to also achieve a very symmetrical cross profile on the hot rolled strip.

Result:

  • when the very tight thickness tolerances are consequently utilised this will lead to weight savings on the finished part as well as to a higher output (more parts per tonne of steel
  • extended lifetime of the tools and less downtime necessary for tool and line adjustments
  • possibility of replacing cold rolled sheets and strip

Advantages because of the availability of high strength steels even in bigger strip thickness

Because of high yield strength and high tensile strength by a good cold formability, the microalloyed and low-pearlite fine-grained steel got a wide application:

  • Because of the problem-free processing against stells with a higher carbon standard,
  • the possibility and necessity of the and weight reduction
  • as well as the possibility to save the heat treatment after creative forming.

New analysis variants makes possible to present highest strength values.

High yield and tensile strengths combined with a still very good cold formability have opened the way for micro-alloyed low pearlite fine-grained steels to a vast amount of applications:

  • because of a less difficult processing compared to high carbon steels
  • because of feasibility as well as the necessity ro reduce thickness and weight
  • and because of possible savings of heat treating operations.

New analysis options allow to reach even higher strength values.

Applications Cold rolling industry

Application related advantages of hot rolled narrow strip for the cold rolling industry. To enable you to produce a high quality cold rolled strip you need an appropriate hot rolled steel strip as a prerequisite. Our hot rolled narrow strip is the material of choice with the following advantages:

Advantages of the mill edges

  • the mill edge is rounded (slit strip = sharp edged)
  • the mill edge comes without burr and micro cracks (cannot be avoided by slit strip)
  • the mill edge has a sorbitic edge microstructure in the area of the highest demand

This leads to certain advantages:

  • even high carbon grades can be rolled down without edge cracking (no loss of material and production time)
  • fewer annealing processes are necessary which means lesser costs. Also extra heat treatment leads to a worse hardening microstructure (coarse grain caused by a longer holding time and higher temperatures) during subsequent hardening processes.
  • extended lifetime of the rolls because of natural shaped edges (instead of sharp edged work hardened material)

Advantages of a favourable transverse profile

  • Hot rolled narrow strip from thyssenkrupp Hohenlimburg offers very tight thickness tolerances over the length as well as over the width of the strip due to the limited rolling width.
  • Wedge shaped strips slit from wide strip cannot be used to produce cold strip with high demands for a symmetric profile and very tight tolerances over the strip width

Result:

  • Hot rolled narrow strip from thyssenkrupp Hohenlimburg with its consistent symmetrical shape is an excellent prerequisite for cold rolling

Advantages of a favourable microstructure

Hot rolled narrow strip from thyssenkrupp Hohenlimburg can be produced with a fine perlitic (sorbitic) microstructure over the length and the width of the strip.

Especially the microstructure of the edges – most important is the area of ca. 30 mm – can be produced with a sorbitic microstructure of nearly 100%.

This leads to certain advantages during cold rolling:

  • non alloyed as well as alloyed carbon steels can be cold rolled with high reduction levels without initial annealing processes
  • fewer annealing processes
  • finest cold rolled microstructure
  • higher uniformity of the mechanical and technological values
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