Overview. Sarclad Limited. Rolltex EDT range. Rolltex EDC a new development project to replace chrome plating of textured rolls

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2 Overview Sarclad Limited Rolltex EDT range Rolltex EDC a new development project to replace chrome plating of textured rolls

3 Sarclad Limited Sarclad Ltd Headquarters, Sheffield UK Design & Manufacturing Product development Sales & marketing Service & after sales support Sarclad NA, Pittsburgh USA Sales & marketing Commissioning & service After Sales support Sarclad China, Shanghai Sarclad India, Bangalore Opened 2015

4 Sarclad Limited Providing Technology Based Equipment to The Metals Industry since 1977 Rolltex EDT for Roll Texturing > 90 units supplied worldwide

5 Rolltex EDT

6 The EDT Process Principle of EDT process Single spark created 20,000 times per second Electrode Plasma Gas Bubble Spark Roll surface Spark created between electrode and roll Gas bubble forms Spark melts roll surface forming a crater Gas bubble grows

7 The EDT Process Principle of EDT process Single crater

8 The EDT Process Principle of EDT process Multiple craters

9 What is EDT used for? EDT produces rolls with an homogenous texture.

10 Textured What is EDT used for? EDT rolls are used cold rolling applications to transfer the texture onto the sheet steel. 5 Stand Tandem Batch Anneal Temper 56 inch (1424mm) Auto body Strip White Product Electro Zinc EDT & Chrome Plating Chrome Plated 1,2,3,4 Temper 80 inch (2000mm) Textured & Chrome Plated Hot Dip Galvanising Textured & Chrome Plated Skin Pass

11 What is EDT used for? EDT rolls used in Production of strip for Auto body and domestic white goods

12 EDT benefits EDT in Production of strip for Auto body and domestic white goods Surface Preparation for Coating Removes minor imperfections Better surface for bonding of paint coatings Industry standard for Automotive applications Formability Retains lubricant before and during pressing Reduces friction in the press Retains surface appearance after forming

13 Sarclad Rolltex EDT machine range Type 1-72 Electrodes for production of up to 1000 rolls per month Type 2-36 Electrodes for production of up to 600 rolls per month Type 3-12 Electrode for production of 300 rolls per month (or narrow strip, Z mills) Type 4 - Eco EDT low volume production up to 100 rolls per month

14 Sarclad Rolltex EDT machine range 72 Electrodes

15 Sarclad Rolltex EDT machine range 36 Electrodes

16 Sarclad Rolltex EDT machine range 12 Electrodes

17 Rolltex ECO

18 Sarclad Rolltex MICRO

19 Sarclad Rolltex - Main Components Electrodes

20 Sarclad Rolltex EDT machine main components Texturing head

21 Sarclad Rolltex EDT machine process simulation ROLL

22 Rolltex EDC

23 Electrical Discharge Coating (EDC) Collaborative project involving Sarclad, Tata NL and CRM EU-funded project CrFreeRolls Objective to find alternative for Cr-VI plating of temper mill work rolls

24 Electrical Discharge Coating (EDC) Principle V EDC electrode time Dielectric Power supply EDC layer Roll Texturing and surface hardening in one process

25 Recast layer thickness (µm) EDC Research Pulse current (A) 8 passes 16 passes Significant influence of the applied current on the layer thickness

26 Recast layer deposited W

27 Recast layer deposited carbides Isolated WC deposits

28 Recast layer deposited carbides

29 EDC process optimisation Earlier trial Increased carbide deposition

30 Proportion (wt%) EDC Research Number of passes Austentite 4A Austenite 8A Austenite 17A Cementite 4A Cementite 8A Cementite 17A Austenite and cementite content changes with number of passes at 4A

31 EDC Validation 2 pairs of Tata standard work rolls textured with EDC Texturing time around twice as long as EDT EDC of rolls at Sarclad for industrial trials at Tata Steel NL

32 Sarclad validation 3D topology of rolls Drive side Sa: 2.44 Sa: 2.45 Sa: 2.46 Very homogeneous EDC surface finish across the roll

33 EDC Validation Tata NL temper mill 21 EDC rolls ready for industrial trials

34 Ra Ra (μm) (μm) EDC Validation Industrial trials roughness retention 2,5 Roughness on on coils coils (114K) - EDC comparison compared EDC with to Cr-pl EDT+Cr rolls 2 1,5 1 0,5 Campaigns rolled with Cr plated rolls EDC Ra constant during full-length 900 tons campaign Good strip surface quality cum weight (tons) Promising results prompting further industrial trials

35 EDC Summary Electrode manufacture optimised Isotropic EDC coated surface produced with hard constituents Thickness of recast layer can be controlled Laboratory tests roughness retention of EDC coating comparable to EDT + Cr-plating First industrial trials very promising Cost savings due to the elimination of additional hardening processes

36 EDC Future Commercialisation of EDC Product launch as part of Sarclad Rolltex equipment on all new EDT machines Upgrade available for all existing Sarclad machines

37 Experience + Innovation Over 35 years of experience Developing new solutions for new roll applications