daewha alloytic product program for rolling mills

28.1.08 Satish Agrawal, India +91-98851-49412

PRODUCT MANUFACTURING PROGRAM FOR PRODUCT MANUFACTURING PROGRAM FOR ROLLING MILLSROLLING MILLS


• 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.


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


• 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


Centrifugal Cast Rolls Production


Daewha Alloytech Rolls


• 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


• Adamite (DAN 1~3)

Roll Metallurgies


• 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


• SG Iron Roll (Spheroidal Graphitic Iron)

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)

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

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)

Roll Metallurgies


• DPH® High Speed Steel Rolls

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

Roll Metallurgies


• High Chromium Rolls

Roll Metallurgies


• 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


• 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


• 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


• 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


Rolls for Section Mills


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.


Rolls for Bar & Wire Rod Mills


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



• Why Hirex



• Application Areas of Hirex



• Alloy-Tic Guide Rollers– Contains 45% (by volume) TiC,– Very lightweight, 20% lighter than tool steel– Reduces load on bearings, increases life



• Alloy-Tic Guide Rollers – Key Properties



• Alloy-Tic Guide Rollers – Advantages


• 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


Other Products Heat Resisting Furnace Roller


Other Products –Radiant Tubes

daewha alloytic product program for rolling mills

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