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FORGED ROLLS

JT Engineering International

FORGED ROLLS

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FORGED ROLLS

Cluster Rolls / Sendzimir or Sundwig /

Our principal Rolls produce all kinds of rolls for cold mill Z Hi,2 Hi, 4 Hi, 6Hi, 12 Hi and 20 Hi

Production:
  • Work rolls (WR) from steel
  • 1st Intermediate rolls (1.IMR) from steel
  • 2nd Intermediate rolls (2.|~\R) from steel
Steel grade is divided into three qualities:
  • Tool steel
  • High speed steel
  • PM steel

The Tool steel and HSS are conventional type vacuum degassed steels that are also available for further refinement by ESR (Electro Slag Remelting). The PM (powder metallurgical) steel is produced by utilizing powder metallurgy technology which allows the design of high alloyed grades without uncontrolled growth of carbides. The WR in service exposure to mechanical and thermal stresses, various types of wear and local high pressure points put high demands on roll properties. For each application, the best compromise between resistance to indentations, abrasive wear and fatigue as well as sufficient toughness must be found. Through combining chemical composition, steel elaboration and heat treatment parameters, suitable roll properties can be reached.

IMR and Side support rolls (SSR)

Abrasive and corrosive wear accentuated by the longer trips, high pressure points, thermal and mechanical stresses put more emphasis on toughness and resistance to work hardening.

Cluster mill rolls are through-hardening rolls: 1st – max. hardening – subcooling temperature 1250°C, 2nd – oil pool or an air cooling system, 3rd – levelling system 4th – washing machine and 5th – tempering to max. 65O°C.

Cluster Strip Mill Rolls

Our Principal for 2-Hi, 4-Hi, 6-Hi and other mill configurations for rolling of strip and wire, made from carbon steels, stainless steels, non-ferrous metals, super alloys and precious metals. Through the long experience and wide portfolio of roll grades, RR can provide customized rolls for various customer needs.

Production:
  • Work rolls (WR) from steel
  • Intermediate rolls (IMR) from steel
  • Back-up rolls (BUR) from steel
Steel grade is divided into three qualities:
  • Tool steel
  • Medium alloy steel

Narrow strip from HSS and PM steel will probably be produced in the future.
The tool steel: Good wear and thermal shock resistance.
Medium alloy steel: For mills with general standards and demands. Selection of grade depends on the requested depth of hardness, wear resistance and roughness retention.
Strip mill rolls are surface hardening rolls: 1st – induction hardening to max. 1100 °C, 2nd – Sub-zero treatment to min. -160°C, 3rd – tempering to max. 650°C.