Daewha Alloytic Product Program for Rolling Mills - Project Sales Corp, India
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Transcript of Daewha Alloytic Product Program for Rolling Mills - Project Sales Corp, India
28.1.08 Satish Agrawal, India +91-98851-49412
PRODUCT MANUFACTURING PROGRAM FOR PRODUCT MANUFACTURING PROGRAM FOR ROLLING MILLSROLLING MILLS
28.1.08 Satish Agrawal, India +91-98851-49412
• 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
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
• 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.
Centrifugal Cast Rolls Production
28.1.08 Satish Agrawal, India +91-98851-49412
Centrifugal Cast Rolls Production
28.1.08 Satish Agrawal, India +91-98851-49412
Daewha Alloytech Rolls
28.1.08 Satish Agrawal, India +91-98851-49412
• 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.
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• Adamite (DAN 1~3)
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• SG Iron Rolls (Ductile Cast Iron Rolls)- Characterized by spheroidal graphite in matrix giving them
tensile strength to withstand heavy loads.
Roll Metallurgies
70-90High resistance to surface detritions and improvement of resistance to breakage
Spheroidal graphite + dispersed complex carbide + bainitic and martensite matrix
CentrifugalCCGI
40-65High resistance to heat crack and good mechanical properties. Low degradation in hardened penetration
Spheroidal graphite + fine pearlitic matrix
Centrifugal and /or Static
SHGI
50-80Good wear resistance. Low degradation in hardened penetration
Spheroidal graphite + bainitic matrix
CentrifugalCDG SG Iron
35-80Wide range of applicationSpheroidal graphite + ferritic or pearlitic or bainitic matrix
StaticSG iron
Hardness Hsc
CharacteristicsMicro-StructureCasting MethodMaterials
28.1.08 Satish Agrawal, India +91-98851-49412
• SG Iron Roll (Spheroidal Graphitic Iron)
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• 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)
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• 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
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• 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)
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• DPH® High Speed Steel Rolls
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• DPH® High Speed Steel Rolls
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• 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
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• High Chromium Rolls
Roll Metallurgies
28.1.08 Satish Agrawal, India +91-98851-49412
• 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)
Rolls for Hot Strip Mills
28.1.08 Satish Agrawal, India +91-98851-49412
• 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.
Rolls for Hot Strip Mills
28.1.08 Satish Agrawal, India +91-98851-49412
• 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.
Rolls for Blooming, Slabbing and Billet Mills
28.1.08 Satish Agrawal, India +91-98851-49412
• 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
Rolls for Section Mills
28.1.08 Satish Agrawal, India +91-98851-49412
Rolls for Section Mills
28.1.08 Satish Agrawal, India +91-98851-49412
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
Rolls for Bar & Wire Rod Mills
28.1.08 Satish Agrawal, India +91-98851-49412
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
Products for Bar and Wire Rod Mills
• Why Hirex
28.1.08 Satish Agrawal, India +91-98851-49412
Products for Bar and Wire Rod Mills
• Application Areas of Hirex
28.1.08 Satish Agrawal, India +91-98851-49412
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
Products for Bar and Wire Rod Mills
• Alloy-Tic Guide Rollers – Key Properties
28.1.08 Satish Agrawal, India +91-98851-49412
Products for Bar and Wire Rod Mills
• Alloy-Tic Guide Rollers – Advantages
28.1.08 Satish Agrawal, India +91-98851-49412
• 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.
Other Products Heat Resisting Furnace Roller
28.1.08 Satish Agrawal, India +91-98851-49412
Other Products Heat Resisting Furnace Roller
28.1.08 Satish Agrawal, India +91-98851-49412
Other Products Heat Resisting Furnace Roller
28.1.08 Satish Agrawal, India +91-98851-49412
Other Products –Radiant Tubes
28.1.08 Satish Agrawal, India +91-98851-49412
Other Products –Radiant Tubes