PT. KRAKATAU STEEL DIVISI PABRIK PENGEROLAN BAJA LEMBARAN DINGIN COLD ROLLED COIL COLD ROLLED SHEET

PT. KRAKATAU STEEL COLD ROLLING MILL PRODUCTION FLOW CHART TCM BAF ECL1 CAL TPM PRP CPL HRC REC SHR SLT CRC CRS CR SLIT P&O As Rolled Full Hard Soft ECL2 Keterangan : Cold Rolling is a term used in the steel industry which applies to the operation of passing unheated metal through rollers to reduce its thickness and control its shape and finish. This process produces a smooth, dense surface and with or without subsequent heat treatment, gives the product certain controlled mechanical properties. From the above production flow, Cold Rolling Mill produces 4 (four) kinds of product. 1. Pickle and Oil : Some of CPL production that being finish product without reduction on reduction mill. 2. As Rolled : Some of TCM production that unpassing the next line such as annealing, cleaning, heating, tempering and finishing. 3. Full Hard : Some of Production that unpassing Annealing Line (BAF or CAL) and Tempering for being Finish Product. 4. Soft : Some of Production that passing to Annealing Line (BAF or CAL) with or without Cleaning line on ECL#1/ECL#2 before Tempering for being Finish Product.

PRODUCTION PLANTS LAYOUT COLD ROLLING MILL WHS PARKING AREA MARSELING YARD SLT SHR REC PRP WHS N7 YARD N1-YARD CPL TPM DE HUMI- DITY ROOM N6 YARD CAL N5 YARD BAF ECL #1 ECL #2 N4 YARD N3 YARD ROLL SHOP TCM N2-YARD ARP Roll Coolant WORK SHOP IV AMB BOILER ELECT. SHOP AIR COMP. HOT STRIP MILL PT. KRAKATAU STEEL COLD ROLLING MILL TCM Elect. Water Treatment Mobile Shop Wood Skid ADB Security Gate N E W S

PRODUCT SPECIFICATION & END USED OF COLD ROLLED COIL & COLD ROLLED SHEET PT. KRAKATAU STEEL COLD ROLLING MILL 1. Commercial Quality (CQ) : JIS G.3141 SPCC SD: SII. No ASTM A.366 DIN 1623 ST Thickness. Width Length Reff.End Use CQ Galvanize Soft Steel Strapping CQ Automotive body Bicycle Parts & Rim Building Material Cabinet Drum Electrical Appliance Galvalum Soft Galvanized Soft Office & Home Equip. Ornament Tubing/Pipe Pipe Special Duct. Steel Strapping Soft CQ Automotive Parts General Purpose Stove CQ Roll Type Writer CQ3EN Enamel Ware 2. Drawing Quality (DQ): JIS G.3141 SPCD-SD;SII No.2451;ASTM A.619; DIN St DQ Automotive Parts (Exposed). Home hold Elect.Appl. Others 3. Deep Drawing Quality (DDQ) : JIS G.3141 SPCE-SD;SII No ; ASTM A.620; DIN 1623 St DQ Automotive Parts (Unexposed). Elect.Machinery Parts. Others

MAIN FACILITIES COLD ROLLING MILL ENTRY ThicknessWidthThickness Width Max. Coil Weight ODID DIAMETER (mm) EntryProcessExit MAX. SPEED (mpm) Annual Cap. (tons) Remarks SIZE (mm) EXIT No. 1. CPL ,345EN= TCM , ECL# , CLECIM CPL LINE Manufact CLECIM 4. ECL# XXXXX160 CLECIM 5. CAL ,740 STEIN HURTEY EX=610 TO TCM=907,345 TCM TO ECL#1= 312,525 TO ECL#2= TO CAL = 202,635 TO BAF = 389,265 ECL #1 TO BAF = 117,735 TO WHS= 190,000 TO BAF = TO WHS= ECL #2 CAL 6. CAL ,000 L 0 I BAF TMBP = 62,000 CQ = 255,615 DQ = 75,670 DDQ = 113, CAL ,725 TPM TO PRP = 231,580 TO REC = 192,055 TO SHR = 130,875 TO SLT = 160,925 CLECIM CAL ,000 PRP TIN FEED = 130,000 SOFT = 90,000 CLECIM 1200 EN=23.4 EX=10 9. CAL ,250 REC FH = 83,250 SOFT = 104,000 CLECIM CAL ,875 SHR CLECIM 120 SHEET : 762x4880(max) 11. CAL ,925 SLT CLECIM PT. KRAKATAU STEEL COLD ROLLING MILL

PLANT FACILITIES CONTINUOUS PICKLING LINE Material: Hot Rolled Mild Steel (0,12%C max.) Annual Capacity: tons/year (67,860 coils/year) Thickness: 1,80 to 6.00 mm Width[ Untrimmed ]: 650 mm to 1350 mm [ Trimmed ]: 600 mm to 1300 mm Coil Diameter [ Outer Dia. ]: 2000 mm. [ Inner Dia. ]: Entry=760 mm, Exit=610 mm Coil Weight: Entry=25 tons, Exit=23.4 tons Equipment Length: 250 m Strip Length: 950 m Looper Car Storage: Entry=500 m Exit=250 m Line Speed: Entry=440 mpm,Process=220 mpm,Exit=330 mpm Tank : Vol.=49.5m3x4tanks, Length=120 m Pickle Tank Solution: HCL Pickle Tank Concentration: Tank 1 = gr/l Tank 2 = gr/l Tank 3 = gr/l Tank 4 = gr/l Before the feedstock of hot rolled coil from Hot Strip Mill can be process- ed in the reduction mill, the “Scale” or surface impurities,resulting from oxidation during hot rolling, must be removed by “Pickling” in hydrochloric acid to eliminate surface imperfections. The hydrochloric acid can be regenerated by thermal decomposition of the waste pickle liquid into hydrochloric acid and iron oxide. This type of iron oxide has a high market value as there is considerable demand for it in the dyestuff and ferrite industries. Sebelum bahan baku Hot Rolled Coil (HRC) dari HSM dapat diproses di Tandem Cold Mill, “Sisik” dari permukaan HRC yang berasal dari oksidasi selama proses hot rolling harus dihilangkan dengan proses “Pickling” dengan asam chlorida (HCl). Limbah dari cairan asam chlorida dapat diolah kembali melalui proses dekomposisi menjadi cairan asam Chlorida dan oksidasi besi. Oksidasi besi dari proses ini dapat dimanfaat- kan dalam industri pencelupan dan ferrite. Specification & Facilities PT. KRAKATAU STEEL COLD ROLLING MILL

PLANT FACILITIES TANDEM COLD MILL Material: Hot Rolled Pickled coil with Carbon Content 0,12% max. Annual Capacity: tons/year Thickness: [Entry=1.80 mm to 6.00 mm ],[ Exit=0.18 mmto 3.00 mm] Width: 600 mm to 1300 mm Coil Diameter : OD:2000 mm (max), ID:[Entry =610 mm, Exit=420 or 508 mm] Exit Coil Weight: kg (max) Reduction Ratio: 92% max. Rolling Speed : 1980 mpm Working Pressure: 215 bars max. Rolling Force: 2500 MT (1250 MT/side) Power of Main : -Stand #1 (2 ea) = 3800 kw -Stand #2 (3 ea) = 5700 kw -Stand #3 (3 ea) = 5700 kw -Stand #4 (3 ea) = 5700 kw -Stand #5 (3 ea) = 5700 kw Tension Reel: 8.8 MT at the max speed. Acceleration: 2.5 m/s 2 Roll: W/R dia.= mm, Back Up Roll dia.= mm. Specification & Facilities PT. KRAKATAU STEEL COLD ROLLING MILL A Five stand four high tandem reduction mill reduce the pickled hot strip (has been pickled in CPL) to the desired thickness. The mill is computer controlled, operates at 1980 m/min and is capable of reductions of up to 92% of the incoming thickness. Perangkat penipis 5 (lima) stand dipakai untuk menipiskan baja lembaran yang sudah dibersihkan di CPL untuk mencapai ketebalan yang diingin- kan. Peralatan ini dikontrol melalui komputer dengan kecepatan rolling maksiumum 1980 m/menit dan dapat menipiskan baja lembaran maksi- mum sampai 92%.

PLANT FACILITIES BATCH ANNEALING FURNACE Specification & Facilities Annual Production : 500,000 tons/year GeneralTin PlateOthers Thickness (mm) Width (mm) Coil Diameter [ OD] (mm) [ ID ] Weight (MT) 23.4 MT max Stack (coils) 4 44 Stack Weight (MT) 94 MT max57.2 MT max64 MT max Stack Height (mm) 4100 (max)4500 Stack Load Factor 60.85%68% Bottom Temp.Soaking: 620oC (min) x 6 hrs (min) Gas controlled Temp.: 660 o C to 730 o C Unloading Temp.: 90 o C (Max) Heating Time: hrs After cold reduction rolling, some of the coils after passing the electrolytic cleaning line or directly has to be annealed in single stack bell type annealing furnaces. The strip which has been stretch and hardned in the mill is unsuitable for any forming or drawing. So it must be heat-treaded at a temperature between 590 o C o C to obtain proper characteristics of ductility, yield elongation, softness and draw ability for further processing purposed. Setelah proses penipisan di TCM, beberapa coil setelah melalui proses electrolytic cleaning atau langsung dari TCM harus di panaskan di Batch Annealing Furnace untuk proses pengkristalisasian. Strip yang mengalami penekanan dan pengerasan di lintasan mill sebelumnya mengakibatkan perubahan struktur pada strip tersebut. Sehingga untuk mengembalikannya harus dipanaskan pada temperatur 590 o C o C untuk menentukan karakteristik yang tepat dari strip agar didapat ductibility,yield elongation, softness dan drawability yang dikehendaki. PT. KRAKATAU STEEL COLD ROLLING MILL

PLANT FACILITIES ELECTROLYTIC CLEANING LINE #1 Specification & Facilities Material: CRC with yield point stress=80 kg/mm2 (max). Annual Production: 350,000 tons Thickness: <0.40 mm Width[Untrimmed]: 600 mm to 1300 mm [Trimmed]: 550 mm to 1250 mm Coil Diameter [ Outer Dia. ]: 2000 mm (max) [ Inner Dia. ]: Entry/Exit = 420 or 508 mm Exit Coil Weight: kg (max) Line Speed : 800 mpm Cleaning Powder: Mixture of SiO2,Ne2CO3 and NaOH Alkali Cleaner [Concentration]: 30 to 40 gr/lt [Temperature]: 75 to 85 o C Current Brush Roll: 14 to 22 Amp Ejector Water Flow: 15 to 20 m 3 /hr Temperatur Air Dryer: 130 o C (Min) Rectifier Current: 25,000 Amp. (max),30 volt (max) - 2 sets. After cold reduction rolling, the remaining oil film and grease on the strip surface must be removed. For this purpose the electrolytic cleaning line using high current density which is an electrolytic process was installed. The high current is supplied from the conductor rolls as positive electrodes to the solution as negative electrode ( wrap to wrap system). Therefore, the oil grease layer is removed from the strip surface. The line is made up of : Entry section, process section and exit section. Setelah proses penipisan di TCM, oli tipis yang melapisi kedua permukaan strip, grease dan material lainnya yang terbawa pada waktu proses reduksi harus dihilangkan. Untuk maksud tersebut digunakan Electrolytic Cleaning Line #1 yang menggunakan arus tinggi. Arus tinggi ini disupplies dari roll konduktor sebagai elektrode positif, solusi sebagai elektrode negatif (wrap to wrap system), oleh karena itu oli, grease dan material lainnya dapat dihilangkan/dibersihkan dari kedua permukaan strip. Lintasan ECL#1 ini terdiri dari Entry Section, Process Section dan Exit Section. PT. KRAKATAU STEEL COLD ROLLING MILL

PLANT FACILITIES ELECTROLYTIC CLEANING LINE #2 Specification & Facilities Material: CRC with yield point stress=80 kg/mm2 (max). Annual Production: 1st=200,000 MT, 2nd=300,000 MT. Thickness: >=0.40 mm Width: 600 mm to 1300 mm Coil Diameter [ Outer Dia. ]: 1000 mm (min) ; 2000 mm (max) [ Inner Dia. ]: Entry/Exit= 508 mm (max) Exit Coil Weight: 23.4 MT (max) Line Speed : Entry & Exit 1st=160 mpm, 2nd=330 mpm Cleaning Powder: Natrium Hydroxide with Silicate Base Alkali Cleaner [Concentration]: 30 to 40 gr/lt [Temperature]: 75 to 85 o C Current Brush Roll: 22 to 26 Amp Temperatur Air Dryer: 130 o C (Min) Rectifier Current: 6,000 Amp. (max),30 volt (max). Line Tension: POR 2600 kg DEG 4600 kg REC 7000 kg PT. KRAKATAU STEEL COLD ROLLING MILL After cold reduction rolling, the remaining oil film and grease on the strip surface must be removed. For this purpose the electrolytic cleaning line using 6000 amp current density which is an electrolytic process was installed. The current is supplied with using grid to grid system. Therefore, the oil grease layer is removed from the strip surface. The line is made up of : Entry section, process section and exit section. Setelah proses penipisan di TCM, oli tipis yang melapisi kedua permukaan strip, grease dan material lainnya yang terbawa pada waktu proses reduksi harus dihilangkan. Untuk maksud tersebut digunakan Electrolytic Cleaning Line #2 yang menggunakan arus 6000 amp (max). Arus ini disupplies dengan menggunakan grid to grid system, oleh karena itu oli, grease dan material lainnya dapat dihilangkan/dibersihkan dari kedua permukaan strip. Lintasan ECL#2 ini terdiri dari Entry Section, Process Section dan Exit Section.

PLANT FACILITIES CONTINUOUS ANNEALING LINE Specification & Facilities Material: CRC with yield point stress=80 kg/mm2 (max). Annual Production: 200,000 tons/year (Soft=90,000,Tin Plate=130,0000) Thickness: 0.18 mm to 0.60 mm Width: 600 mm to 1067 mm Coil Diameter [ Outer Dia. ]: mm (max) [ Inner Dia. ]: mm (max) Exit Coil Weight: 20 MT (max) Line Speed : Entry/Exit=580 mpm; Proses=450 mpm Threading=60 mpm. Cleaning Powder: Alkali Cleaner [Concentration]: 30 to 40 gr/lt [Temperature]: 75 to 85 o C [Line Speed ] : 200 to 450 mpm Rinsing System : [Current Brush Roll]: 14 to 22 Amp [Ejector Water Flow]: 15 to 20 m 3 /hr Temperature Air Dryer: 130 o C (Min) Rectifier Current: 15,000 Amp. (max),24 volt (max) - 2 sets. Heating / Holding Temp.: 670 o C o C (max) Cooling Temp.: 400 o C o C (max) Furnace Exit Temp.: 100 o C (max) The purpose of the annealing process is to recrystalize the strip coming from Cold Reduction Mill, since the strip thickness is reduced in Tandem Cold Mill, the crystalline structure of Cooled Rolled Steel is stretched out, crushed out and hardened, so the strip losses its properties to be easily bent, deep-drawn, etc. In this annealing process. The strip is heated up to 700 o C max. (depends on quality required) and kept at this temperature for certain period and then cooled down; so, the new crystal grains grow gradually. Tujuan utama dari proses annealing ini adalah pengkristalisasian kembali strip setelah diproses di Tandem Cold Mill. Ketika tebal strip mengalami proses penipisan di Tandem Cold Mill, struktur kristal dari strip mengalami perubahan sehingga daya properties mekanisnya berkurang. Dalam proses annealing strip dipanaskan sampai 700 o C max, selama periode tertentu, kemudian didinginkan (Proses kristalisasi). Proses ini dapat meningkatkan properties mekanis dari strip sehingga diperoleh kemampuan formability, drawabilty, ductility yang dikehendaki. PT. KRAKATAU STEEL COLD ROLLING MILL

PLANT FACILITIES TEMPER PASS MILL Specification & Facilities Material: CRC (Annealed),Tight wound coils,C=0.12% (max) Annual Production: 700,000 tons/year Thickness: 0.18 mm to 3.00 mm Width: 600 mm to 1300 mm Coil Diameter [ Outer Dia. ]: Entry= mm; Exit=900 to 2000 mm. [ Inner Dia. ]: mm (max) Exit Coil Weight: 23.4 MT (max) Rolling parameter setting: Single std :Roll Force=170 MT (min);Ext.=2% Double std :Roll Force=180 MT (min);Ext.=2% Maximum Rolling Speed : 1980 mpm (new W/R) Maximum Rolling Force: 1200 MT (600 MT per side) Mill Acceleration: 2 m/s 2 Maximum Elongation: 2% Power of main motors: Stand #1 = 4 x 424……………………… KW Stand #2 = 2 x 424……………………… KW Pay of Reel reel, 3.3 MT at max speed KW Tension Reel = 5MT at max speed…… KW Entry/Exit Tension Bridle ……………… KW The Temper rolling is a cold working operation, similar in principle to cold reduction. The difference is that, in temper rolling one strives to get definite mechanical properties, definite surface pattern and improvement of strip shape. Small reduction of % are also taken, whereas in cold reduction, the reduction is far, greater magnitude (50-90%). Pada prinsipnya, Temper Mill adalah sama dengan Tandem Cold Reduction Mill (TCM). Perbedaannya adalah didalam Temper Mill ini berusaha untuk mendapatkan sifat-sifat mekanik logam yang diperlukan, kerataan permukaan dan meningkatkan strip shape. Reduksi di TPM sangatlah kecil antara % sedangkan penipisan di TCM jauh lebih besar dari TPM yaitu 50-90%. PT. KRAKATAU STEEL COLD ROLLING MILL

Specification & Facilities Material: CRC, Yield Strength 28 kg/mm2 max. Annual Production: 220,000 tons/year Thickness: 0.20 mm to 0.60 mm Width[Trimmed]: 500 mm to 1250 mm [Untrimmed]: 550 mm to 1300 mm Coil Diameter [ Outer Dia. ]: Entry= mm; Exit=700 to 1500 mm. [ Inner Dia. ]: mm (max) Entry Coil Weight: 23.4 MT (max) Exit Coil Weight: 10 MT (max) Oil Coating Blade: mg/m2 Line Speed[Proc.Section]: 1220 mpm (max) [Threading]: 30 mpm This line special for final inspection process to complete the quality of product such as, oiling, side trimming and packing in coils. Thickness range can be processed for this line is 0,20 mm mm. Lini ini khusus untuk inspeksi akhir dari proses untuk melengkapi kualitas produk sesuai dengan permintaan customer seperti, pelumasan oli, pemotongan sisi dan pembungkusan dalam bentuk gulungan. Ketebalan yang dapat diproses di lini ini adalah 0,20 mm - 0,60 mm. PT. KRAKATAU STEEL COLD ROLLING MILL PLANT FACILITIES PREPARATION LINE

Specification & Facilities PT. KRAKATAU STEEL COLD ROLLING MILL PLANT FACILITIES RECOILING LINE Material: CRC, Yield Strength 28 kg/mm2 max. Annual Production: 200,000 tons/year (Soft= ,Tin Plate=83.250) Thickness: 0.18 mm to 3.00 mm Width[Trimmed]: 500 mm to 1250 mm [Untrimmed]: 550 mm to 1300 mm Coil Diameter [ Outer Dia. ]: Entry= mm; Exit=700 to 2000 mm. [ Inner Dia. ]: mm (max) Entry / Exit Coil Weight: 23.4 MT (max) Oil Coating Blade: mg/m2 Line Speed[Proc.Section]: 500 mpm (max) [Threading]: 30 mpm This line special for final inspection process to complete the quality of product such as, oiling, side trimming and packing in coils. Thickness range can be processed for this line is 0,20 mm mm. Lini ini khusus untuk inspeksi akhir dari proses untuk melengkapi kualitas produk sesuai dengan permintaan customer seperti, pelumasan oli, pemotongan sisi dan pembungkusan dalam bentuk gulungan. Ketebalan yang dapat diproses di lini ini adalah 0,20 mm - 3,00 mm.

Specification & Facilities PT. KRAKATAU STEEL COLD ROLLING MILL PLANT FACILITIES SHEARING LINE Material: CRC, Yield Strength 28 kg/mm2 max. Annual Production: 120,000 tons/year Thickness: 0.18 mm to 3.00 mm Width[Trimmed]: 500 mm to 1250 mm [Untrimmed]: 550 mm to 1300 mm Coil Diameter [ Outer Dia. ]: Entry=2000 mm (max) [ Inner Dia. ]: mm (max) Entry Coil Weight: 23.4 MT (max) Exit Packing Weight: 5 MT (max) / Pack Length: mm Height Pack: 700 mm Oil Coating Blade: mg/m2 Line Speed[Shear.Section]: 122 mpm (max) [Threading]: 30 mpm [Piling Section]: 145 mpm (max) This line special for final inspection process to complete the quality of product such as, oiling, side trimming, shearing and sheet packing. Thickness range can be processed for this line is 0,20 mm mm. Lini ini khusus untuk inspeksi akhir dari proses untuk melengkapi kualitas produk sesuai dengan permintaan customer seperti, pelumasan oli, pemotongan sisi, pemotongan dalam bentuk lembaran dan pembungkusannya. Ketebalan yang dapat diproses di lini ini adalah 0,20 mm - 3,00 mm.