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1 STEELPL ATES STEEL PLATES3334353637384245464749505152535455 565859606272 ContentsPressure Vessel Available STEEL Grades Characteristics (non-HIC guaranteed) Characteristics (HIC guaranteed) Supplementary Requirement 9%Ni STEEL High Mn Cryogenic STEEL Testing and Evaluation MethodsStructure & Construction Available STEEL Grades STEEL plate for Construction Structure SN STEEL for Building Structure PILAC STEEL for Building Structure HSB STEEL for Bridge Structure Additional Guaranteed Quality EN10025 Structural STEEL STEEL plate for Mechanical Structure Abrasion-Resistant STEEL High Strength STEEL for Welded Structure (POSTEN)TMCP SteelList of Mechanical TestMarkingMill Test CertificateAvailable DimensionsGlobal Sales Network46 810 12 151617202122242527282930 ContentsIntroduction: Pohang, Gwangyang WorksPOSCO ProfileR&D SystemManufacturing ProcessQuality Management SystemShipbuilding Approved STEEL Grades Chemical Composition & Mechanical Properties Development of New Products Offshore Available STEEL Grades Mechanical Properties - CTOD Mechanical Properties - Others Guaranteed Supplementary Requirement Main Supply Records API Steels for Line Pipe Available Sizes : HRC Products Available Sizes : plate Products Main Supply Records Testing and Evaluation Methods 4681012 1516172021222425272829303334353637384245 464749505152535455565859606272 Contents : POSCO & - CTOD - API Line Pipe.

2 Table (HIC ) (HIC ) 9%Ni High Mn Cryogenic STEEL (HIC,SSCC) SN PILAC HSB EN10025 (POSTEN)TMCP (Marking) POSCO ( ) : : API : 16,18 5 (2013) : : API : 20,231 (2013) : Pohang WorksGwangyang WorksPohangGwangyangCHINAjAPANkOREAS eoul04 POSCO STEEL PlatesPOSCO STEEL Plates05 POSCO POSCO 06 POSCO STEEL PlatesPOSCO STEEL Plates07 US STEEL US STEEL , SeAH STEEL Corp.

3 2009 6 80 (Zhangziagang)STS 20 (Chingdao)STS 80% Mill Mill Mill krakatau STEEL 600 Mill 120 20 STS Mill 1,5 0 0 1,8 0 0 jul. 1972 #1 Feb. 1978 #2 Nov. 1988 #2 jun. 1990 Sep. 1997 #3 jul. 2001 ERP(Enterprise Resource Planning) Nov. 2003 #3 jun. 2005 #2 Aug. 2010 (250 ) jul. 2011 (N,Q ,T ) 1 ( : WORLD STEEL DyNAMICS, ) ( ) 1 POSCO 2 SAIL 3 NLMk 4 Severstal 5 CSN * 2011 (FOR TuNE, )1970 1980 1990 2000 200710 1968 1973 1 ( ) 1983 ( )1988 1992 ( )2002 POSCO 1994 1995 2005 2008 2000 20 30 History( , )

4 POSCO STEEL PLATES Charpy DWTT Tear , (CO2. H2S) / (SSCC) / SSCC POSCO : * RIST Research Institute of Industrial Science & Technology (1987 )* POSTECH Pohang University of Science & Technology (1986 ) POSLAB 08 POSCO STEEL Plates09 POSCO #1 #2 #3 #4 ( / ) 62 270 118 250 (mm) 6~120 6~200 ~200 8~200 (mm)

5 Max 3,100 Max 4,500 Max 4,000 Max 5,300 (mm) Max 15,500 Max 25,000 Max 25,000 Max 25,000 - 21 - 28 Power 3,600 x 1 7, 2 0 0 1 (RM) 8,000 1 12,000 x 2 9,000 1 (FM) - Multi jet Type Multi jet Type Multi Laminar jet Type ( x 28m) ( x 24m) ( x 24m) - 50mmt(75kg ) - 50mmt(75kg )/SlitteruT (SMT) (SMT) (SMT) (NDT) - NQT x 1 Nor x 1 NQT x 1 (20 , )(Nor ) Nor x 1 (40 ) (20 ) Batch(3 ) Batch(3 ) / , , (TMCP, Nor ) (TMCP, Nor , QT) (TMCP, Nor , QT)

6 Roughing MillFinishing MillDividing ShearCold Thickness GuageShot BlastCold LevelerWarehousingMarking / Inspectionultrasonic TestCrop ShearDouble Side ShearAccelerated CoolingReheating FurnaceHeat TreatmentContinuous CastingConverterHot LevelerCooling Bed10 POSCO STEEL PlatesPOSCO STEEL Plates11 POSCO ISO 9001, 14001 Finishing MillShippingFinishing / Inspection & WarehousingDividing ShearCrop ShearDouble Side ShearInspection Flow of STEEL PlateRoughing MillAccelerated CoolingHot LevelerCooling BedCold Levelerultrasonic TestSlab Inpectionthickness width length weightPlate Thickness MeasureSurface Inspectionscale roll markPlate Temperature MeasureSize, Surface, Shape InspectionInternal Defect InspectionHeat TreatmentInternal InspectionReheating Furnace12 POSCO STEEL PlatesPOSCO STEEL Plates13 ISO9001 LRQA( ) 3 ISO14001 LRQA( )

7 3 POSCO 11 POSCO Big 3 TMCP TMCP A,B,D,E AH32~EH32 A,B,D,E AH32~EH32 AH40~EH40 EH47 AH36~EH36 AH36~EH36 kR( ) 100 83 100 100 100 80 RL37 (50) ABS( ) 100 83 100 100 100 80 VH-060 (50) LR( ) 100 90 100 100 100 80 LTFH36 (50) DNV( ) 100 90 100 100 100 80 NV4-4 (50)

8 Nk( ) 100 83 100 100 100 80 kL37 (40) GL( ) 100 90 100 100 100 80 - BV( ) 100 90 100 100 100 80 510LF (40) CR( ) 100 90 100 100 100 - - RINA( ) 100 90 100 100 100 - 460LE/LF (40) CCS( ) 100 90 100 100 100 - - RS( ) 100 100 100 100 100 - - GradeEH47.

9 (mm)14 POSCO STEEL PlatesPOSCO STEEL Plates15 & Grade A B D E AH~EH32~40 EH47 C Mn > > > > ~ Si P S Cu.

10 - 1) Cr,Ni,Mo,S-Al,Nb,V,Ti 1) Al, Nb, V Ceq AH32~EH32 , AH36~EH36 , AH40~EH40 t 50 50 < t 70 70 < t 100 A, B, D, E 235 400~520 22 27 34 41 AH~EH32 315 440~570 22 31 38 46 (440~590)1) AH~EH36 355 490~630 21 34 41 50 AH~EH40 390 510~660 20 39 46 55 EH472) 460 570~720 17 64 Grade (MPa) (MPa) (%) S0 Longitudinal(Joule)1) ABS, CCS, LR, Nk 2) ABS draft rule( ) : EH47-TM, EH40-TM( ), AH40-TM( ) EH47-TM 80 -10 C CTOD, -40 C HAZ , EH40-TM( ) 80 Tandem EG EH36 AH40-T( ) 80 (1mm/m.