Daewha Alloytic Product Program For Rolling Mills

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Project Sales Corp represents Daewha in India Markets and sells the product range to Tata Steel, JSW, Sunflag and others.

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Daewha Alloytic Product Program For Rolling Mills

  1. 1. PRODUCT MANUFACTURING PROGRAM FOR ROLLING MILLS 28.1.08 Satish Agrawal, India +91-98851-49412
  2. 2. • Formed with the merger of Alloytic Co. Limited, a global supplier of Titanium Carbide Guide Rollers and Hirex® rollers to bar and rod mills worldwide, and Daewha Engineering Co. Limited, a manufacturer of special steels and alloy steel mill rolls with a large casting capability. • Global customers include all original equipment suppliers like Morgan, Danieli, Morgardshammer, and who’s who’s in the steel manufacturing business, including Tata Steel, Vizag Steel, Mukand, Usha Martin and Sunflag in India. 28.1.08 Satish Agrawal, India +91-98851-49412
  3. 3. Production Facilities • High Frequency Induction Furnaces • Horizontal Centrifugal Spin Casters • Heat Treatment Furnaces • Roughing Lathes, CNC Finishing Machines, Milling Machines, Boring Machines and Vertical lathes • Certified ISO 9001 28.1.08 Satish Agrawal, India +91-98851-49412
  4. 4. Centrifugal Cast Rolls Production • Centrifugal Cast Roll production capabilities for: – roll diameter minimum 200 Ф and maximum 1400 Ф – Roll length maximum 3000 mm • Double casting method of external shell layer solidification and injection of inner core material. 28.1.08 Satish Agrawal, India +91-98851-49412
  5. 5. Centrifugal Cast Rolls Production 28.1.08 Satish Agrawal, India +91-98851-49412
  6. 6. Daewha Alloytech Rolls 28.1.08 Satish Agrawal, India +91-98851-49412
  7. 7. Roll Metallurgies • Adamite & Steel Base Rolls – Low Carbon (DSN) Base – High Carbon Base • Adamite Steel • Graphite Steel • High Carbon Base products have very hard toughness and excellent thermal shock resistance making them suitable for all rolling mills. 28.1.08 Satish Agrawal, India +91-98851-49412
  8. 8. Roll Metallurgies • Adamite (DAN 1~3) 28.1.08 Satish Agrawal, India +91-98851-49412
  9. 9. Roll Metallurgies • SG Iron Rolls (Ductile Cast Iron Rolls) - Characterized by spheroidal graphite in matrix giving them tensile strength to withstand heavy loads. Materials Casting Method Micro-Structure Characteristics Hardness Hsc SG iron Static Spheroidal graphite + Wide range of application 35-80 ferritic or pearlitic or bainitic matrix CDG SG Iron Centrifugal Spheroidal graphite + Good wear resistance. Low 50-80 bainitic matrix degradation in hardened penetration SHGI Centrifugal and /or Spheroidal graphite + fine High resistance to heat crack 40-65 Static pearlitic matrix and good mechanical properties. Low degradation in hardened penetration CCGI Centrifugal Spheroidal graphite + High resistance to surface 70-90 dispersed complex carbide detritions and improvement of + bainitic and martensite resistance to breakage matrix 28.1.08 Satish Agrawal, India +91-98851-49412
  10. 10. Roll Metallurgies • SG Iron Roll (Spheroidal Graphitic Iron) 28.1.08 Satish Agrawal, India +91-98851-49412
  11. 11. Roll Metallurgies • Indefinite Chilled Iron Rolls (Ni Grain Rolls) – High alloy centrifugal indefinite chilled roll – Graphite distributed in the matrix – High heat conductivity and thermal rigidity – High quality of product surface due to graphite – Application areas include hot strip mills (rear finishing stand), medium, small section mill (finishing stand), bar and rod mills (intermediate and finishing stand) 28.1.08 Satish Agrawal, India +91-98851-49412
  12. 12. Roll Metallurgies • DPH High Speed Steel Rolls ® – Composed of outer shell layer containing high carbon and high alloy and core layer of SG iron. • Characteristics: – High hardness, high resistance to abrasion – High resistance to adhesiveness by surface oxide layer – High resistance to heat cracks and thermal fatigue – Good surface quality – Fine and uniform structure until deep inside 28.1.08 Satish Agrawal, India +91-98851-49412
  13. 13. Roll Metallurgies • DPH High Speed Steel Rolls ® • Application Areas: – Hot strip mills (Roughing mill rolls) R2-4: Semi –HSS – Hot Strip mills (Finishing work rolls) F1-4 : HSS – Bar, Wire and rod mills (roughing and intermediate stands) 28.1.08 Satish Agrawal, India +91-98851-49412
  14. 14. Roll Metallurgies • DPH High Speed Steel Rolls ® 28.1.08 Satish Agrawal, India +91-98851-49412
  15. 15. Roll Metallurgies • DPH High Speed Steel Rolls ® 28.1.08 Satish Agrawal, India +91-98851-49412
  16. 16. Roll Metallurgies • High Chromium Rolls – Composite rolls manufactured by centrifugal casting technique – Contains variable quantity of eutectic chromium carbides and secondary carbides – Chromium contents give higher hardness and resistant to abrasion – Hard and adhesive oxide film on surface of eutectic chromium carbide – Superior mechanical properties Application Areas – Steel : HSM roughing work roll – Iron : HSM Finishing work roll (Easy Stand) Skin Pass Type Roll 28.1.08 Satish Agrawal, India +91-98851-49412
  17. 17. Roll Metallurgies • High Chromium Rolls 28.1.08 Satish Agrawal, India +91-98851-49412
  18. 18. Rolls for Hot Strip Mills • Requirements of work rolls for roughing stands – Wear resistance – Heat-crack resistance – Free from scale banding – Reduce slippages to minimum for higher rolling speeds and quality of strip product Keeping this in mind: • Daewha Alloytech rolls come in centrifugally Adamite (DAU-1C), High Chromium Cast Steel (DHS-1C) and Semi High Speed Steel (DXS-C) 28.1.08 Satish Agrawal, India +91-98851-49412
  19. 19. Rolls for Hot Strip Mills • Requirements of work rolls for finishing stands – Resistance to wear and surface deterioration – Front finishing stands to withstand high rolling temperatures and a high draft to avoid scaling off and scaling banding – For rear finishing stand rolls, resistance to crack by cobble required. Keeping this in mind: • Daewha Alloytech rolls come in high chromium cast iron with high resistance to scaling-banding (DHW-3C) and high speed steel with increased resistance to abrasion (DXSW-2C). For rear finishing stand rolls DA provides anti-segregation and enhanced carbide ICDP (DGNV-2C) rolls. 28.1.08 Satish Agrawal, India +91-98851-49412
  20. 20. Rolls for Blooming, Slabbing and Billet Mills • Billet, Slab and Bloom Mill rolls must withstand high rolling loads, have great heat resistance and retain hardness even at the bottom of the deep groove. Keeping this in mind, Daewha Alloytech • SHGI Roll (DIS-1) has a hardness (Hs) of 45-50 and is most suitable for roughing stand. Highly resistant to heat cracking. • Intermediate Rolls have a hardness of 55-60. • For Finishing Rolls, centrifugal double poured SG Iron roll provides excellent wear resistance and good surface finish to the product. 28.1.08 Satish Agrawal, India +91-98851-49412
  21. 21. Rolls for Section Mills • Requirements of rolls in section mills – High toughness – Rolls need deep groove in the barrels, quantity of rolling per operation is enormous. Surface hardness not to differ from groove bottom hardness. – Must be highly resistant to heat cracking and abrasion. Keeping this in mind, Daewha Alloytech provides – Adamite (DAN-2) and Graphitic steel (DAG-2) with high toughness for breakdown mill – Adamite (DAN-3) and Graphitic Steel (DAG-1) with high resistance to abrasion, SHGI (DIS-2) with high surface quality, centrifugal double cast SG Iron for roughing and intermediate stands. – Finishing stands rolls come in CCGI (DIW-1C), CDP SG Iron (DIN-6) with high resistance to abrasion due to centrifugal casting. – H Beam Rolls come in High Carbon Adamite (DAU-2C), Graphite Steel (DAG-2C) with high toughness and hardness 28.1.08 Satish Agrawal, India +91-98851-49412
  22. 22. Rolls for Section Mills 28.1.08 Satish Agrawal, India +91-98851-49412
  23. 23. Rolls for Bar & Wire Rod Mills • Various kinds of rolls used in Bar and Wire Rod Mills. • Roughing Stand roll requires resistance to abrasion and thermal resistance. • Intermediate and finishing stand rolls need higher hardness and surface quality. • Daewha Alloytech provides: • For Roughing Stands – Adamite (DAN-2) with biting property and strength – SHGI Roll (DIS-1) rolls with high surface quality. • For Intermediate & Finishing Stands – Centrifugal High Speed Steel (DXS-C) and centrifugal CCGI (DIW-2C). – CCGI preferred for high hardness and surface quality. 28.1.08 Satish Agrawal, India +91-98851-49412
  24. 24. Rolls for Bar & Wire Rod Mills 28.1.08 Satish Agrawal, India +91-98851-49412
  25. 25. Products for Bar and Wire Rod Mills • Introducing Hirex – a new material, centrifugally casted high speed steel with higher heat resistance and lower cost – Eliminates problems faced by DCI and WC rolls 28.1.08 Satish Agrawal, India +91-98851-49412
  26. 26. Products for Bar and Wire Rod Mills • Why Hirex 28.1.08 Satish Agrawal, India +91-98851-49412
  27. 27. Products for Bar and Wire Rod Mills • Application Areas of Hirex 28.1.08 Satish Agrawal, India +91-98851-49412
  28. 28. Products for Bar and Wire Rod Mills • Alloy-Tic Guide Rollers – Contains 45% (by volume) TiC, – Very lightweight, 20% lighter than tool steel – Reduces load on bearings, increases life 28.1.08 Satish Agrawal, India +91-98851-49412
  29. 29. Products for Bar and Wire Rod Mills • Alloy-Tic Guide Rollers – Key Properties 28.1.08 Satish Agrawal, India +91-98851-49412
  30. 30. Products for Bar and Wire Rod Mills • Alloy-Tic Guide Rollers – Advantages 28.1.08 Satish Agrawal, India +91-98851-49412
  31. 31. Other Products Heat Resisting Furnace Roller • Hearth Rollers in mini mills needs to be changed periodically (approx 6-8 months) due to heat resistant brick’s breakage and separation from main roller body. • The heat resisting brick is filled between the wheels which is contacted with the products directly during process. • Daewha Alloytech Co. Limited has developed new type of hearth roller that eliminates this problem, with remarkable improvement in performance. 28.1.08 Satish Agrawal, India +91-98851-49412
  32. 32. Other Products Heat Resisting Furnace Roller 28.1.08 Satish Agrawal, India +91-98851-49412
  33. 33. Other Products Heat Resisting Furnace Roller 28.1.08 Satish Agrawal, India +91-98851-49412
  34. 34. Other Products – Radiant Tubes 28.1.08 Satish Agrawal, India +91-98851-49412
  35. 35. Other Products – Radiant Tubes 28.1.08 Satish Agrawal, India +91-98851-49412

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