iiiiiiiiiiiiiii -- Tenaris

Customer I Clicnl!:;

Manufdcture Process I Proccso c..f<~ fabricatiOn. SEAMLESS HOT ROLLED LAMINADO EN CALIENTE SIN COSTURA

MILL TEST CERTIFICATE

IS0 11 960/API 5CT SR15 ICustom<!r's Ord~!r I Orden Clientc - Item W ~~50007.5<04 ITEM I

!:Product Type I Tipo de produc\o. CASING SEAMLESS REVESTIMIENTO

Nurnhcr I Nlimcro Page I Pagina:

08030739 1 /38 Oi!lCIOia: JUn 03, 2008

Tubos de Acero de Mexico. S.A. Carret. Mexico Veracruz Km 433.7 SN Delfino Valenzuela Tejerfa, Veracruz, Veracruz C.P. 91 697 MEXICO (52) 229 989 1100 tel (52) 229 989 1600 fax

!Customer's Rdcrcnce/l!cf€f<lr1Cia del clieme Manufacturcr·s WOJks O.de• N' I C<>nr.rrnacion de Vema I 106919103

Surf>K:Il I Sup.,rlicin. See "SUpplemt'lltary lnformation­Vcr informacion suplcrncntaria

Standard or SpecifiCation I Normas o nspeciliorcion~-s .

EDIT ION ISO 11960IAPI5CT ,EIGHTH Steel Grade I Grado de accro.

T95 1 PSL1 Ends I Extrcmos. TENARIS HW TENARISHW

Dimensions I Dimensiones.

10 314 X 0.797 INCH 273.05 X 20.24 MM

Schedule I C(>dula

NIA rlength I l ongiwd. 36.00 I 46.00 FT 10.97 /14.63 MTS

Specimen condition Specimen dimensions Test ConditiOn de Ia pmbcta Dirnensiones de Ia probeta temp

HeatW Sample w Zon<~ PipcN" Colada N" MucstraN" Zona TuboW

38837 81563 E1 00003

38838 81565 [2 00105

38&18 81575 E2 00305 388<19 81573 E1 00205

~ 1 J f.2: Ends or Sampling I t:xttcmo obtcociOn mucstra Qr: Quenched and' l cmpcr~d I Tcmptado y Revcnido

. t:·Longltudinai/ Longltudw•11 RcQ. ·Max~ MaXimum Required I Maximo Rcqucrido LMax: Longitudinit1 Muximum I Mc1xirno Lonnitudinal

l s Sc

B QT B QT

B QT () 0 1'

Type Tipo

Cyl

Cyl

Ss Cvl

Size Area fernp. Ori Tamano Secci6n de

cnsa\'0

mm mm2 ·c L 12.55 123.70 RT

L 12.53 123.31 RT

L 37.90 X 20.15 770.51 RT

L 12.53 123.31 RT

l.s: Location ol" the s:,mp'c /lotnlizaeiOn de fa muC$Lm Ss: Strip specimen 1 R"cl31l!Jular

: RT: Room Te~pcratu~c t ·rcmpl'fatt• a J\mhtcnte Oht: Obtained I Obtcnido · rMin: Jr8nsvetsc .. Minimuin I Mlnimo Traf\S>Jt!rsal

Quantity I Cantidad. 9,917.192 FT 3.022760 MTS

Y.S. U.T.S. Unit I Unidad Unit I Unidad

PSI PSI t:ul 0.5%

cquircd/Rc~qvcriOO Rcquirod/Rcqucric!o

Min: Min: Max: TMax: Min: 95.000.00 LMin: 105,000.00

LMax: 110.000.00 LMax: 101284.5 118750.8 101298.7 118<137.9

103674.0 119533.1 106461.8 121510.1

6: Oody I Cucrpo C)l: Cytinori::al / Cilin<JriC<>

215 Pcs/pz 850,020.928 LB 385.561.000 KG

Y.S. I Elongation

U.T.S. Alargamiento

Rcq. Max. %in 2 inches

Min.: API OIX. · % .. ·

0.85 . 27 0.86 ·27

0.87 38·

0.88 26 -

EUL: Exlmsion Under load Method . ' VS.: Victd Stiength I Flur.ncia

TMa_x: TransvCrsc Maximum I Maximo Tran:sYCtS.al

Nominal Weight I Peso Nominal 85.30 LBIFT 126.19 KGIM

Sc: Specimen condition I CondiciOO de b Pfobcta Ofl: Orlcntation I OricnLacOO

U1S: U~lmatc rcnsllc SUcngth I Rcsistcncia 't.Min: Longitudinal Minimum 1 Minimo l ongitooinal Mn: Minimum ., Minimo

This ccrtflteatc is issued by a r.ompuv~rin::d ~y.;tcm und il is va!id \dh C:lcetronle signat.Utc. On tho original ecrtilicato the tlaOO-mark ?OOO c:okxOO "Tmarb" is sounpt:c:l. 111 casc tlit} owr~t.!l ~ IJu! cw-i~Jina4 ccrtiOc.a.u.! would rtiooSC a copy of it. he must <~ltcst its confbfrnity to the ori~ Jirml or)C tnkif-H Lt'()n himself UIC rcstJOnstlifily lor au unlnwful or not allowed usc. 1\ny akcraoon and/or fdlSific•don will be sublccled to the law. l

;sto ccrtiflc~do sc omitc mediante~ sistoma computarimdO yes validado con firma cle'le:I/Onic-.t. Ft tcYTiHcac:to original posec in'p"cso cllogo renaris cok)r vr.rdc. fn ~ode que ¢1 poo<!C<Iur dc:l catiOcado cntrC9UC una copia. dc!berll ~J»rantitw L1 conformidad con cl original haci&ldosc reroonsablc oor cua!Quicr uso -~al o indcbidn. Cualit1uicr alcfacial y/o ralsifacidn t.-sltd :sui.t..."'li1 OJ Ia lev.

OICA 77704 0

'.

Tenaris Tubos de Acero de Mexico, S.A. Carret. Mexico Veracruz Km 433.7 SN Delfino Valenzuela Tejeria, Veracruz, Veracruz C.P. 9 1697 MEXICO

MILL TEST CERTI FICATE Number 1 N(Jmero Page 1 Pagina: (52) 229 989 1100 tel (52) 229 989 1600 fax

08023545 1 /40 15011960/APISCT SR15 Date/ ora: May 08, 2008

ustomer I Clientc: l;ustomef's Order I Orden Cficnte . Item N" ICustomer·s Rel'ercncPJRefercncia clef cliente Manuracturer·s Works OnJer N" 1 Cl)llftrmarJOn de vcnw 4$0001.54~4 ITEM 1 105248/09

Manufacture Process I Proceso de fabricaci6n. l:roduct Type I Tipo de producto. Surface I Superficie. ~EAMLESS HOT ROLLED CASING SEAMLESS VARNISHED LAMINADO EN CALIENTE SIN COSTURA REVESTIMIENTO BARNIZADO Swndard or Specirocation I Normas o cspecificaciones. ISO 11960/SCT .EIGHTH Steel Grade I Gr~do de a<ero. F.nds I Ex11omos. T ENARIS HW EDITION T95 1 PSL1 TENARIS HW Dimensions I Oimensionc ... Schedule I Cooula ~~ngth I Longitud. Quantity I Cantidad. 213 Pcs/pz Nominal Weight I Peso Nominal 10 3/4 X 0.797 INCH N/A 36.00 I 48.00 FT 9,905.971 FT 845,256.714 LB 85.30 LBIFT 273.05 X 20.24 MM 10 97 /14.63 MTS 3 019.340 MTS 383 400.000 KG 126.19 KGIM

:'i.W::y;~·::.'~~:"e': ;.r-~;: :' r::•:~,,~~;~}'n?~?-'?'.r}::~.::~~:;:.~;-;:-: .• :;,''\·;~;;'fr;~.;;!l.''7Y'f."'·~':f:'?II:~'~St,. ·~n±;NS.JtE1TE5T.;:rE:NS~Y'O'S~'t]E"'T'E:NSlTII\f;'"'?':·<">· :··:' .;,'":-'' · ·:.~t;·~.~~~;.:~~; ~!:~ :~:::';~,~~~f.~~~J.:;::~~~~f:~~:.;:z~~~:ry~~~~~~~~~~~~J.:~

Specimen condition Specimen dimensions TCSI Y.S. U.l.S. Y.S. Condlclon de Ia orobeta Oimension<.-s de Ia orobeta temp Unit I Uniclad Unit/ Unidad I Elongation

HeatN' Sample N" Zone Pipe N' l.s Sc Type Size Area Temp. PSI PSI U.T.S. Alargamiento Colada w Mucstra N" Zona Tobo N' Tlpo Ori ramai\o Sec ciOn de Eul 0.5%

ensavo cquired/R<Jquerido Reqoir"<.'d.IRL-qucrido Rcq. Min: TMin: Ma•. %in 2 inches

TMa-= 1Max: Min.: API LMin: 95.00000 ~in: 105,000.00 Obt

mm mm2 ·c LMax: 110,000.00 ~ax: %

38835 81551 t2 00105 a QT Cyl L 12.55 123.70 RT 99478.1 117243.1 0.85 26 38836 82267 E1 00008 B QT Cyl L 12.50 122.72 RT 100431.1 117428.0 0.86 27

JW36 82268 E1 00009 B QT Cyl L 12.53 123.31 RT 102194.8 118366.8 0.86 26

JW36 82269 E1 00014 B QT Cyl L 12.51 122.91 RT 99919.1 117300.0 0.85 26

38837 81561 E1 00205 B QT Cyl L 12.55 123.70 RT 103588.7 120898.5 0.86 2V

38837 81563 E1 30003 B QT Cyl L 12.55 123.70 RT 101284.5 118750.8 0.85 27

38838 81565 E2 30105 B QT Cyl L 12.53 123.31 RT 101298.7 11 ~37.9 0.86 27

3W48 81575 E2 30305 13 QT Ss L 37.90 X 20.45 770.51 rn 103674.0 119533.1 0 .. 87 38

38849 81573 E1 30205 B OT Cvl L 12.53 123.31 RT 106461.8 121510.1 0.88 26

( 1 I E2: f.nds of Sampling I fXlrlmO Oblo:naoo mueslfa Ls: l.ocatlon of !he sample lloca~zaciOn ~c Ia mu""ra s: 6ooy 1 Cuerpo SC; SpccitnCil condition 1 Concridon de~ probcta

QT: QoJCnCI>Cd and Tempe<P.d I fempla~o y Rcvonido Ss: SUip SI)CCir'llCO I Rectangular ()1: C)1indrical / Cilfn<lrica Ori; 0Jientation I Orientaci6n

l: Longitvdint~l/longitudinul ItT: R•;om tcmpcracurc/ TC'O'Ipcrawra Ambientc £UL~ Eda:n:tioCl Under lOad Melhod UTS: Ultimate Tensile Strength J Rcsis:tmtia

Rcq. Ma<: Ma•lmum Rcqu~co I Maximo Rcqucrido Otn: (>bl.ai•led I Obtcnklo Y.S.: Yidd Strength I Fluenc:ta I.Min: Longitudinal Minimum I Minimo Longitudinal

lMa" LOO<titooinal Maximum I Maximo l.onqitudinal 'IMirl : Transverse Minimum I Mlnimo Transversal TMax; ra· .. dnlver'SC Madn1um I Maximo Transversal Min: Minimum 1 Minimo

1'h6 ccn:ificate is issued by a co~uteli%eC1 :(_ySt(:m ano I\ is v£i<J wil.h CIOClrrJfl ic signature. On the Oflglnal certificate t.1lc lf3(1C..mark ~non coiOiCd If'" <a1.iflcodo,. cmite mcoianlc '"'lema conlpuwitodo y "'val;dodo con firma clocvoniQJ, e ""rt<ricado Ol'lglnal poscc imprcs<> <1 10g0

"Tcnaris" is stamped. In case the ownc1 of the 01'igi n~1l ccrtmc:;n_c would release a copy of it he must attest its conformity to the cwiginal one (aJ.:.ill!J TenariS cofOr V<!1t1C. rn caso de que cl ~'tlor dt:t ootiflc.<J<JO cno~e u"'a oop.la, IJCIJen1 garafUil.ar Ia coriormidad con eJ Otiginal h~ciendo!c

upon himsell tho rC!Sponsibilit'l fiJr any ll>~dwlul or notalfOwtd u>O. /\o'lV alt<lfMinn anO/or falsifoeatioo will be subjected to lhe law. rcsc,...,blc nor rualoui<.< uso ~ooal o lndcbido. Cualquil'< altCJliCi<in ylo fal:lifaci<ln C'>tara suicla a I;) lev. DICA 77704 0

= -- Tenaris Tubas de Acero de Mexico, S.A. Carret. M exico Veracruz Km 433.7 SN Delfino Va lenzuela Tejeria, Veracruz, Veracruz C.P. 91697 MEXICO

ATIACHMENT OF HARDNESS TEST AS QUENCHED

AND% OF MARTENSITE OBTAINED

Nurnller I Nt)mero Page /Pagina:

OP132127 1/3 o at.c/Dfa: Jun 03, 2008

(52) 229 989 1100 tel (52) 229 989 1600 fax

!Customer's Order I Orden C~ente · Item N" ICustomcr·s Refcrcncc/Rdett.'fltia del clientc Manufacturer's Works Order N" I Conflnnaci<in de Vcnta I4S000254(M IHM 1 I 106919/03

1'-ustorrlCr I Clionte:

Manufacture l'roccss I PrOCC$0 de fabricatiOn. !:Product fype I Tipo de producto. Surface I Supcrficie. SEAMLESS I·IOT ROLLED CASING SEAMLESS see "Supplementary Information· LAMINADO EN CALIENTE St N COSTURA REVESTIMIENTO Ver informaciOn suolcmcntaria Standard or Specification I Normas o espcdficacfones. ISO 11960/API 5CT ,EIGHTH Steel Grade I Grado de acero. Ends 1 Extremos. TENARIS HW

E:E:!::D"-IT,_,I;::::O,_,N'-:-::::----:---------r~-:-:--:-::.,-:-:-------.,,.---,--,...,..--,~-----·--------------------t::T:-"9"':5 -',:1 '-'PS":'L"::1 ---:-:-:7"'".'-------------t7:T'='EN""A"'R:71'7-S7-H7":W!...:-::.--~-,.-.,----------I Dimensions I Oimcnsioncs. rS.:hcdule I C6dula rlength I longitud. Quantity I Cantidad. Nominal Weight I Peso Nominal 10 3/4 X 0.7971NCH N/A 36.00/46.00 FT 85:30'LB/FT 213.05 X 20.24 MM 10.97/14.63 MTS 126.19 KG/M

.. , "•

,. • :.i

Heat/Colada:

I l oll Lote: I, Required I Rcquet'ido HllC lieat/Colada: I Lot/Lote: I, Require() f Rcqucrido HRC Ne:tii\..<)I<•(Ja: I LOt I l o tc: lr Required l l~cquerido l·IRC Hi!<!t/Colada:

I l ot f l.Ote: I, Required I Rcquerido HRC

38837 Min: Max: 38837 M in Max: 38837 M in Max: 38837 Mln MiJx: tsampleiMuestra: 55494 17.onetlona: El Samplc/Mucstra: 55494 I Zone/lona: E1 amp!e/Mucstra: 55494 IZoneJZona: E1 Sample/Muestra: 55494 IZone/lona: E1

Quadrant Aver Quadrant Aver Quadrant Aver Quadrant Aver

Cuadrantc 1 2 3 Prom Var Cuadranlc 1 2 3 Prom Var Cuadrante 1 2 3 Prom Var Cuadrante 1 2 3 Prom Var

1 00 45.0 47.5 46.5 46.3 2 DO 45.9 46.3 46.0 46.1 3 00 45.6 46.4 47.0 46.3 4 01) 45.0 45.9 46.4 458 Unit I Unidad MW 45.0 46.1 45.7 45.6 Unit I Unldad MW 45.7 46.2 45.4 45.8 Unit I Unidad MW 46.2 45.3 45.8 45.8 Unit I Unidad MW 45.9 455 462 45.9

HRC 10 46.2 45.8 46.2 46.1 0.7 HRC II) 46.6 47.0 47.4 47.0 1.2 HI~C 10 46.4 47.4 47.4 •47.1 1.3 HRC 10 46.6 46.7 47.5 46.9 1.1 Pipe N" /Tubo W: 00002 ILs: B I Sc: Q Pipe N' I Tubo W: 00002 ILs: B lsc: Q Pipe N' I Tubo N": 00002 JlS: B JSC: :) 'ipe N" /lubo W: 00002 llS: B I Sc: q

Heat/Colada:

I

lol i l.ote: II Required I Requerido llf~C Heat/Colada: I Lot flote: lr Required / l~equcrido I·II'IC Heat/Colada: I l ot flote: II Required I Requcrido HflC Heat/Colada:

I l otllote; lr Required I Rcquerido HRC

38838 M in: Max: 38838 Min Max; 38838 M in Max: 5 38838 Min M ax:

Sample/Muestm: 55495 !Zone/Zona: E2 Sample/Muesua: 55495 jZI)O(>JZona: E2 Sample!Mucstra: 55495 I Zonenona: E2 ISample/Mu~-stra: 55495 JZone/Zona: E2. Quadrant Aver Quadrant Av~'f Quadrant Aver Quadrant Aver

Cuadrantt~ 1 2 J Prom Var Cuadrante 1 2 3 Pwm Var Cuadrante 1 2 3 Prom Var Cuadrantc 1 2 3 Prom Var

1 00 46.6 48.3 46.9 47.3 2 00 45.2 45.9 45.1 45.4 3 OD 45.4 47.1 47.0 46.5 4 00 45.9 46.3 46.1 46.1 Unit I Unidad MW 45.8 46.4 45.7 46.0 Unit/ Unidad MW 41.2 46.6 47.8 47.2 Unit I Unidad MW 46.0 47.9 46.4 46.8 Unit I UnidaCI MW 45.8 46.7 45.9 46.1

HRC 10 45.7 45.4 45.1 45.4 1.9 HRC 10 46.6 47.5 47.1 47.1 1.8 HRC ID 46.7 47.0 45.9 46.5 0.3 H RC II) 45.2 45.1 45.6 45.3 08 l'loa w I Tuoo W: 00102 ILs: B JSC: Q Pipe WI Tubo N": 00102 ls: B ISc Q Pipe w I Tubo N": 00102 ls; B ISC: Pipe w I l'ubo N": 00102 ls: B Sc: lhis ccn:if IC:'!tc is h-:~ucd by a computcri1cd syst.t ~m <-Jnd iL is valid wilh t·k~r.lronit. signature. On lhc nriyinal c.crtificutc '.he lrdde·m.mk QfCcn colon:.'<t 1:stc catificooo se emil <: me<liantc si;;lmn.> C<l!TlliAaria do y cs validadO con firma clcr.tronica. Fl ccrtdicado origiMI poscc imprcso cllogo ·Tcnaris" is stamped. In case th'~ ovvnt.f of the or~Jtn!IJ c:mtilic:aU! \1\IOOkJ rcle~sc a copy of it. hl~ O"IU$l atU!st it\ conformity to tho original t1nc t.1k ln~J Tcnaris cobr verde. En casu d•: qun cl po~~~ior c:k~l ccrtifirndo cntr~uc un<J_ copia. d!!hc:r.t gar~mP.ar 1.') conformidad con ct origjnal ha~ndos;,l upon himself the responsbiBl'y fo.f anv unlawful or not all<r.wd U'$'' · Any alv..-ralion and/or talsific::ation will bo subicclcd to tile taw. lrC5PQnsablo por cuatquil~r U$0 ilc~~JUI u lndcttido. Cw1tquicr altcraciOn ~o falsUieacion l.'stan! SS !~a a Ia _Icy:._

OICA 777 04 0

Tenaris Tubos de Acero de Mexico. SA Car ret. Mexico Veracruz Km 433.7 SN Delfino Valenzuela Tejeria, Veracruz, Veracruz C.P. 91697 MEXICO

ATTACHMENT OF HARDNESS TEST AS QUENCHED

AND % OF MARTENSITE OBTAINED

Number I Nllmero

OP132127

Page I Pilgina:

2/3

(52) 229 989 1 1 oo tel (52) 229 989 1600 fax

Date/Dia: Jun 03, 2008 Customer I Clicnte: ICuswmer·s Order I Orden Cliente - Item N"

I<SOOOZ>-lo• rr~:M 1 jl;usrorner·s Refcrcoce/IMLYcrx.ia dd dicntc Manufacturct"S WorkS Order N" I Connrmacion de Venta I 106919/03

Manufacture Process I Proccso de fabricacion. SEAMLESS HOT ROLLED LAMINAOO EN CALIENTE SIN COSTURA Standard or Specification I Normas o cspcciflcaciones. EDITION

l:;roduct Type I Tipu de producto. CASING SEAMLESS REVEST IMIE NTO

ISO 11960/API SCT ,[IGHTH

Dimensions I Oimensiones. 10 3/4 X 0.797 INCH 273.05 X 20.24 MM

l;>thedulc I Cedula

IN/A rlongth I l.ongitud. 36.00/48.00 FT 10.97/14.63 MTS

Steel Grade I Gr•do de accro. T95 1 PSL1 Quantity I Cantidad.

Surface I Supenocie. See "Supplementary Information" Ver informacion suolcmcntaria Ends I £xtremos. TENARIS HW T ENARISHW Nominal Weight I Peso Nominal 85.30 LB/FT 126.19 KG/M

.. ·.· :' '· 1.,:-~; .. ., ... · . . ... · · :' . . .'! . - ~~··: ·. "THROUGH WALL HARDNESS' lDUREtA EN ELTSPESOR .. - ·. '·

:

Hear/Colada:

I Lot!Lote: I

1 Required I R<::querido fiRC l"lcmJColada: I Lotllote: 1

1

Required I Rcqucrido liRC tiea1/Colilda: I Lot/lote: lr Required I Rcqucrido HRC Hear/Colada: I Lor /Lore: I, Required I Requcr!d•> J8848 Min: Max: 38848 M in Max: 38848 Min Max: 38848 Min Max:

·amplc/Mue~rra: 55497 I Zone/Zona: E2 Samplc/Mucstra: 55497 !Zonellona: E2 amplc/Mucstra: 55497 !Zone/Zona: E2 Samp!e/Muestra: 55497 I Zone/Zona: Quadrant Aver Quadrant Aver Quadrant Aver Quadrant Aver

Cuadrantc 1 2 3 Prono Var Cuodr-ante 1 2 3 Prom Var Cuadrante 1 2 3 Prilm Var Cua<tanto 1 2 3 Prom

1 00 46.5 47.0 46.0 46.5 2 00 46.5 47.8 46.5 46.9 3 00 45.3 47.2 46.7 46.4 4 00 45.6 45.3 46.7 45.9 Unit/ Unidad MW 44.9 46.2 47.0 46.0 Unit I Unidad MW 45.6 46.8 47.0 46.5 Unit I Unidad MW 45.9 46.0 46.7 46.2 Unit/ Unidad MW 46.3 46.7 46 .. 4 46.5

HRC ID 47.6 46.7 46.8 47.0 1.0 HRC 10 47.7 47.5 46.3 47.2 0.7 HRC ID 46.8 47.2 46.7 46.9 0.7 HRC ID 47.2 47.8 46.5 47.2 ?ipe W /Tubo N': 00331 lt.s: 13 IS<:: Q Pipe N" I Tubo N": 00331 ILs: B ISc: Q 'ipl) N' I Tubo N": 00331 ILs: B JSc: Q Pipe N' I Tubo N•: 00331 ILs: B ISc:

Hear/Colada:

I Lot/ lote: II Required I Rcquerido IIRC Heat/Colada: I Loti Lote: II Required I Requcrido HRC HealfColada: I tot ll.ote: lr Required I Requerido ~IRC HeaVColaela: I Lot/ Lote: I, Required I Rcqucriuo

38849 Min: Mtnc: 3884~ M1n Max; 38849 Min Max: 38849 Min Max: Sample/Mueslra: 55496 IZoMilona: E1 ampleiMuestra: 55496 l loncllona: El ampfeJMuesua: 55496 I Zone/Zona: El Samplc/MuestJa: 55496 JZoneiZona:

Quadrant Aver Quadrant Aver Quadrant Aver Quadront Aver

Coadrante 1 2 3 Prom Var Cuadrante 1 2 3 Prom Var Cuadranr"e 1 2 3 Prom Var Cuadmn1c 1 2 3 Prom

1 00 46 7 47.2 45.4 46.4 2 OD 46.0 46.8 47.2 46.7 3 00 45.7 46.1 47.6 46.5 4 00 45.8 46.4 47.8 46.7

Unit I Unidad MW 46.4 46.6 45.4 46.1 Unit I Unidael MW 45.4 46.1 46.8 46.1 Unit I Unidall MW 46.4 494 47.9 47.9 Unit I Unidad MW 47.9 46.6 46.6 47.0

HRC ID 46.9 47.2 46.8 47.0 0.9 Hr~c ID 47.2 47.8 47.4 47.5 1.4 HRC ID 47.9 47.9 46.8 47.5 1A HRC ll) 47.8 47.7 48.4 48.0 Pipe N' I TubO W: 00206 lls: B ISc: Q Pipe N" I TullO N": 00206 Jls: ll JSc: Q 'ipo N' I Tubo N': 00206 Ls: B ISc: - Q Pipe N" /lubo N': 00206 Ls: B Sc:

[1 I E2: Ends of Sampling I Extrcmo obl~:ncion lfiU\lStra Is: I oc4Jtlon of the sample ILocalizodO:r! de fa rnucstra 0: Body I Cucrpo Sc: Specimen conditio• I C:omttcion de Ia pmbcta Q: Quenched I T ompla<fo Oil: Outside Oiam(~cr 1 Oiamctro Extcrno MW: Middle Wall I Centro 10; lm.crnai Oittmotcr I ()!:'!metro fntcrno Min: Minimt¥11/ Mlnimo Mi\x: Maxlrrun I ~ximo Avor.: 1\YOtago Prom.: Promodio var.: variation I Variation

~~~ ccrtiFocatc ~ issued by • <omputL~ilod S'f'U:m and il << vnlid with clectmni< signature. On tile original <Citlfocatc the trade-moll< grc1m <Oic>rt:d IEooifiC<ldO sc ornitr. m<ldiMtc sO!cmil compUlarltildO y cs valid•do con frnna '~"'""'";,,. _ El ccrtificodo arigilol flO'SCO imprcso cllogo naris" is stampoct ~ c:aso the O'llftl)r or lhe oritJiu;,l CCfliriC(l{C V«luld release a copy of It, he must ancst its conformity to U•~ origi'MI Dill! tak.inB s colorvt'fdC'. t:n CMO de que 1~1 pOSf!OOa del ccrtiflcado cnU't .. 'gUC una copia. dl•t)L.~ 9<Jflilntit.a:r IB oonforrnidad con ei cwlginal hacicn<Jose

on himself IIIC rcsponsib~ity ror any unlil\1\fular not allow..'>d uoe. Any alto<atlon ond/or fals~ic<Jtion will b<l so.tllccted to tro law. n"'ble oor cuaiQuicr uso ilt'®l o ildct>idl>. Cualqula' •ttcr•don y/o folsiticacion C>'at~ sol cia ala Icy.

,I HRC

E2

Var

1.3 Q

HRC

E1

Var

1.3

DICA '777 040

-- Tenaris ATTACHMENT OF HARDNESS TEST AS QUENCHED

AND %OF MARTENSITE: OBTA I NED

Number I Numero Page I Pagina:

OP1 32127 3 / 3 Date/Dfa: Jun 03, 2008

Tubos de Acero de Mexico, S.A. Carret. Mexico Veracruz Km 433.7 SN Delf ino Valenzuela Tejeria, Veracruz, Veracruz C.P. 91697 MEXICO (52) 229 989 1100 tel (52) 229 989 1600 f ax

Customer I Clicnte: Custnmcr·s ReferenceiReferencia del clientc Manuf<~cturef's Works Clfder N" I Confinnacion de Venta

Manufacture Process I Proceso de fabricaci6n. SEAMLESS HOT ROLLED LAMINADO EN CALIENTE SIN COSTURA Standard or Spcci focation I Normas o especificaciones. EDITION

N" 110950

4500025404 ITEM 1 Product Type I Tipo de producto. CASING SEAMLESS REVESTIMIENTO

ISO 11960/API SCT .EIGHTH

This ccnifl(.alC is ~'"SUt'd by a cOtl'lpi.J(crilcd systcm and I. is V:Jiid w1th cloc"tronlc si9naturc. <XI the Ollginal ccnifrcatc the trade-matt green cotored "Tcnaris" is starr.,od. In ca:.c lhe own<.'f of lhe (l(iQilli:'ll CM:irteato wavid relc:asc a copy of it. he must attest its coniOnnlty to the oliginal one taking u n himself the rc iba· ior a unlawful or not allowed""'· An atta-ation and/or falsification will be su ·ccw<l to the law.

Steel Grade I Gmdo de acero. T951 PSLl Quantity I Cantldad.

106919/03 Surface I Supc<ficie. See ''Supplementary Information" Vcr informacion su lementaria Ends I Extrcmos. TENARIS HW TENARISHW Nominal Weight I Peso Nominal 85.30 LB/FT 126.19 KG/M

DICA 777 040

--- Tenaris Tubos de Acero de Mexico, SA Carret. Mexico Veracruz Km 433.7 SN Delfino Valenzuela Tejeria, Veracruz, Veracruz C.P. 91697 MEXICO

ATIACHMENT OF HARDNESS TEST AS QUENCHED

AND% OF MARTENSITE OBTAINED

Number I Numero

O P131707

Page I Pagina:

1 I 4

(52} 229 989 1100 tel (52) 229 989 1600 fax

Date/Dia: May 08, 2008 Cw.;tomer I Clicnt.e: ICustom~n Order I Oroen Cliente • item N"

14500025404 I fEM 1 jC.r.."tomcr ·s RcfcrencciRcfcrencia del cliente Manufocturer's Wort<.s Order N" I Confirmation de Venta I 105248109

Manufw:urc Process I Proceso de fabricaciOn. SEAMLESS fiOT ROLLED LAMINADO EN CALIENTE SI N COSTURA S!arldarcl or Spocir.cation I NO£mas o cspecincaciofl()S. EDITION

'

:Product Type I Tipo de producto. CASING SEAMLESS REVESTIMIENTO

ISO 11960/SCT .EIGHTH

Dimensions I Dimensioncs. l iSchedule I C~'dula !'Length I Longitucl. 10 3/4 X 0.797 INCH N/A 36.00 /48.00 FT 273.05 X 20.24 MM 10.97/ 14.63 MTS

Steel Grade I Gr3do de accra. T951 PSL1 Quanti\)' I Cantidad.

. . .,, , . : t : '! : ·,::. - >

,,l ' , • • , ,.'·'< ·; •,o ; Co : \":' THROUGH WALL HARDNESS I'DURtZAIN·EC'ESPESOR ''

Beat/Colada:

I Lot/Late: I, Required I Requerido HllC Heat/Colada: I Lot I Lote: I, Required I Requericlo HRC Heal/Colada: I Lolllote: I, Required I Requerido

38835 Min: Max: 38835 Min Max: 38835 Min Max: SampleiMu~o~tra: 55492 !Zone/Zona: E1 ample/Mt.ewa: 55492 I ZoncfLon.~: E1 S..mplc/MUC5tf 3: 55492 !Zone/Zona:

Quadrant Aver Quadrant Aver Quadrant Aver

Cuadranle 1 2 3 Prom Var Cuaclrantc 1 2 3 Prom Var Cuadrante 1 2 3 Prom

1 OD 450 44.7 45.9 45.2 2 OD 46.4 46.1 46.1 46.2 3 00 46.4 47.2 46.9 46.8 Unit I Uniclad MW 454 44 8 45.8 45.3 Unit I Unidad MW 47.9 46.4 46.5 46.9 Unit/ Unidad MW 47.6 46.2 47.5 47.1

HRC 10 46.1 46.2 46.1 46.1 0.9 HRC 10 46.0 47.7 47.3 47.0 0.8 HRC II) 46.1 46.8 46.5 46.5 Pipe N' I TtJbo N": 00102 Ls: B Sc: 'ipc N' /Tubo N': 00102 L<: B lk Q Pipe N' I l'ubo N': 00102 ls: B Sc:

Hea!IColada: I Lotllote: 1. Requin..xl I Requericlo fiRC Heat/Colada: I Lot/Late: t Required I Requcndo HRC 1-leatiColada: I Lot I Late: lr Required I Requericla 38836 Min: Max: 38836 Min Max: 38836 Min Max:

Sample/Muestra: 55491 j ZonciZona: (2 ~ple/Muestra: 55491 llone!Zona: E2 · SamplcJMuestra: 55491 I Zone/Zona:

Quadrant Aver Quadrant Aver Quadrant Aver

Cuadrante 1 z 3 Prom Var Cuadrante 1 2 3 Prom Var Cuadrante 1 2 3 Prom

1 OD 46.1 45.7 45.8 45.9 2 00 45.3 44 .7 44.9 15.0 3 OD 45.1 44.2 442 44.5

Unit I Unidad MW 46.1 45.5 45.3 45.6 Unitlllnldad MW 45.6 44 .7 45.1 45.1 llnit/ llnidad MW 45.4 44 .7 45.0 45.0

HRC 10 44.6 44.5 44.2 44.4 1.5 HRC 10 44.5 45.3 45.8 45.2 0.2 HRC 10 43 .5 43.6 43.6 43.6 Pipe N' I Tubo N': 00021 lls: B ISc: Q Pipt~ W ITubo N': 00021 ILs: a ISc: Q ?ipe N" !Tubo N': 00021 lls: B ISc:

'lh~ cc1tifc ate is issuC!d by a computcri1.cd system and iL is vatid with <!kx:tJe~nic sign:ttorc. On \he origlr\31 cett lfk:ato tho tracb-mark gn:r~n c-<)IOJ'cd

HRC

E1

· Var

0.6 Q

HRC

E2

Var

1.4 Q

SUI'face 1 Supcrficie. VARNISHED BARNIZADO Encls 1 Extremes. TENARISHW

TENARIS HW

Nominal Weight I Peso Nominal 85.30 LB/FT 126.19 KG/M

He~t/Colada: I Lot llote: t Required I Requerido

38835 Min Max: Sample/Muestra: 55492 IZoneiZooa:

Quadrant Aver

· Cuadrantc 1 2 3 Prom

4 Of) 46.1 45.9 46.1 46.0 UnitltJnidad MW 46.8 46.2 45.3 46.1

HRC 10 46.9 45.9 45.4 46.1 !Pipe WI Tubo N': 00102 Ls: B ISc:

Heal/Colada: I Lot llote: 11

Required 1 Requerido

38836 Min Max:. sample/Muest<a: 55491 Zonellona:

Quadrant Aver

Cuadraote 1 2 3 Prom

4 00 44.8 44 .2 45.7 44.9 Unit{ Unidad MW 45.4 45.7 44.0 45.0

HRC 10 43.4 43 .8 44.2 438 Pipe WI Tuho N': 00021 Jls: B ISc:

HRC

El

var

0.1

~

HRC

E2

Var

1.2 Q

''Tt:naris" is stBmpccJ, In c::ase the owner of the <IC'iginal ccrt;itlcatc Wllld rt.>lcasc:, copy ot it, he must atrest its conformity to the crigk"lal one taking ~~<to co~ifocado so oml!c mo(f;anto si<u:m.> computari?~do y cs validado con nrmo olcctr6nico. r-1 cott;rrc•do orig;nal posee irr<PfOSO or lcgo

renarls c()lorvordc. [ n caso ck! que cl posccdo( d<:l ccJti:fi(;3(Ja Olltfcgue un.1 copia ~beet~ g.lranti7.ar fa conformidad con cl origin~l haei<mdoso upen llimsdf the rcsponsibHil'f lor any unlawful or not anowcr:~ usc. Any alteration and/t:< f•,.."-"<ion wil be subjcc<cd to the law. rcsponS'lbiC !"". waJgu;cr ulO liCQal o n<llbrdo. CU.IcoMor •ltcracioo ~1o fa~tr~C<~!:ion eswa Slllma ala lev.

DICI\ 177 04 0

--- Tenaris

Customer 1 Cliente:

Manuracture Process I Proceso de fabricati6n. SEAMLESS HOT ROLLED LAMINADO EN CALIENTE SIN COSTURA f>tandard or Specification I Nom1as o especificaciones. EDITION

ATTACHMENT OF HARDNESS TEST AS QUENCHED

AND% OF MARTENSITE OBTAINED

Number I Numero Page I Pagina:

OP131707 2 I 4 Date/Dia: May 08, 2008

Tubos de Acero de Mexico. S.A. Carret. Mexico Veracruz Km 433.7 SN Delfino Valenzuela Tejeria, Veracruz, Veracruz C.P. 91697 MEXICO (52) 229 989 11 00 tel (52) 229 989 1600 fax

!Customers Order I Orden Cliente • item W 1<500025<04 ITEM 1

I Customer·s ReferencetRererenda del cliente Manufacturer's Worl<s Order W I Conlirmaci6n de Venta

!:Product Type I Tipo de p<oducto. CASING SEAMLESS REVESTIMIENTO

ISO 11960/5CT .EIGHTH

I 105248/09

Steel Grade I Grado de acero. T95 1 PSL 1

Surface I Superlicie. VARNISHED BARNIZAOO Ends I Extremos. TENARIS HW

TENARIS HW

Dimensions I Oimensiones. 10 3/4 X 0.797 INCH 273.05 X 20.24 MM

1;;chedule I Co!dula IN/A r

length I longitud. 36.00 /48.00 FT 10.97 114.63 MTS

Quantity I Cantidad. Nominal Weight I Peso Nominal 85.30 LBIFT 126.19 KG/M

l;~:~;~~~~~r.~t~~!f:~'}l~~~;~df~!~t:~;~.';~;;(~JRr.~~d1;~:~~,~·~.;~{<!:'-'-:~?.:·;.·.~ .~'!.· ::· t''' • ,., HJX~Ol\JtS~rrE:ST-r:t1EI\f$1\'Y&~if'!JE~·lJ@l~]~:fl1-\'«.{~\~~'\Jl:-~;ryr~~~-~, "~~:"Y~f:e·.•r·t~;" i~~~~~;;;~t~\1~-!.'f:;~~,~rr.r.ftf§.~fp;~t~l~:~~t

'THROUGH WAlL HARDNESS /DUREZA:.:[N ELESPESOR- , ' -.:.}.· . .. · :· . . ....

HeatiColada: I lotllote: II Required I Requerido HRC Heat/Colada: I l ot/tote: I 1

Required I Requerido HRC HeaVColada: T Lot / tote: 1 11equired I Requerido HRC Heat/Colada: I Lot/Lote: II Required I Requerido HRC

38837 Min: Max: 38837 Min Max: 38837 Min Max: 38837 Min Max: SampiPlMuestra: 55493 IZone/Z011a: E2 SampleJMuestra: 55493 Zone/Zona: E2 SamDfefMuestra: 55493 I Zone/Zona: E2 Sample/Muestra: 55493 I Zone/Zona: E2

Quadrant Aver Quadrant Aver Quadrant Aver Quadrant Aver

Cuadrame 1 2 3 Prom Var Cuadrante 1 2 3 Prom Var Cuadrante 1 2 3 Prom Vat Cuadrante 1 2 3 Prom Var

1 00 45.1 47.0 46.5 46.2 2 00 47.5 47.2 47 .2 47.3 3 00 46.4 46.5 46.2 46.4 4 00 48.9 48.7 48.4 48.7 Unit! Unidad MW 45.9 45.2 46.3 45.8 Unit I Unidad MW 45.8 46.3 46.4 46.2 Unitt Unidad MW 45.3 46.3 46.1 45.9 Unit /Unidad MW 45.9 46.4 46.6 46.3

HRC 10 46.4 46.3 46.7 46.5 0.7 HRC 10 45.5 46.0 46.3 45.9 1.4 HRC 10 45.9 45.7 46.6 46.1 0.5 HRC 10 46.3 45.4 46.2 46.0 2.7 Pipe N" I TubO N": 00217 Ls: B Sc: Q Pipe N" I Tubo N": 00217 ILs: B ISc: Q Pipe N" I Tubo N": 00217 ls: B Sc: Q Pipe N" I TubO N": 00217 ls: B Sc: Q

HeatiColada: I l ot/tote: I 1

Required I Requerido HRC Heat/Colada: I t otllote: I 1

Required I Requerldo HRC HeaVColada: I Lot I tote: 1 Required I Requerido HRC HeatiColada: I l otllote: I, Required I Requerido HRC

38837 Min: Max: 38837 Min Max: 38837 Min Max: 38837 Min Max:

Sample/Muestra: 55494 I Zone/Zona: E1 Sample/Muest.ra: 55494 Zooe/Zona: E1 Safiii)leJMuestra: 55494 I Zone/Zona: El Sample/Muestra: 55494 IZoneJZona: E1

Quadrant Aver Quadrant AYer Quadr8nt Aver Quadrant Aver

Cuadrante 1 2 3 Prom Var Cuadrante 1 2 3 Prom Var · Cuadrante 1 2 3 Prom var Cuadranre 1 2 3 Prom Var

1 00 45.0 47.5 46.5 46.3 2 00 45.9 46.3 46.0 46.1 3 00 45.6 46.4 47.0 46.3 4 00 45.0 45.9 46.4 45.8

Unit/ Unidad MW 450 46.1 45.7 45.6 Unit I Unidad MW 45.7 46.2 45.4 45.8 Unit I Unidad MW 46.2 45.3 45.8 45.8 Unitt Unidad MW 45.9 45.5 46.2 45.9

HRC 10 46.2 45.8 46.2 46.1 0.7 HRC 10 46.6 47.0 47.4 47.0 1.2 HRC 10 46.4 47.4 47.4 47.1 1.3 HRC 10 46.6 46.7 47.5 46.9 1.1

ipe N" I TubO N": 30002 Its: B ISc: Q Pipe N' I Tubo W: 30002 ILs: B Sc: Q PiOe N" I Tubo N": 30002 lls: B ISc: Q Pipe W I Tullo N": 30002 l.s: B Sc: Q

This ccnif.catc is issued by a ~utcrizcd system and it is valid with <:loc.tronic signature. On thl~ u tiginal c:ert.ifteatc tOO trado-mart ~ccn colored 1:• (1>rtilic:.>do se emkc mediante sistema computariza<IO y cs valida<IO con f•ma cJI)C{(()ni<a. a certificado original pO<CC imprcso cl logo

MTcnarisM is stamped. ln case the owner of lhe Oliginul ct.rtifJCatc would tclcasc il copy ot it. hi~ must altcst ib conformity to lhc orlgir\31 one: takin9 Tcnaris color verde. En case do que cl posoodor del cert.ifado cntrcgue I.Ala copia, debcfa garantizar Ia cont'ocmidad con el original haciGndosc

uooo himself tllc ruoonsib~itv tor anv unlawful or not allowtd usc. llnv alteration and/or falsification will be 5Ubiccted to ll1c low. rMOOOsablc oor cualaui<T uso ii<'Oal o indcbitlo. Cualquior alter..: iOn ylo falsificodon cstara su· eta a Ia Icy. DICA 777040

-- Tenaris ATTACHMENT OF HARDNESS TEST AS QUENCHED

AND% OF MARTENSITE OBTAINED

Number I Numero Page 1 Pagina:

OP131707 3 / 4 Date/ Dla: May 08, 2008

Tubos <le Acero de Mexico, S.A. Carret. Mexico Veracru;z: Km 433.7 SN Delfino Valenzuela Tejeria, Veracruz, Veracruz C.P. 91697 MEXICO (52) 229 989 1100 te l (52) 229 989 1600 fax

I'-U5tomer I Clientc: !Customers Order I Orden Cliente - Item w k;ooozs~o~ IT!rM 1 lCustomen Reference/Referencia del clicnte Manufacturer-s Works Order N" I Confirmation de Vcnta

105248/09 Manufaclure Proces$ I Proceso de fabrkocion. SEAM LESS HOT ROLLED LAMINADO EN CALIE NTE SIN COSTURA I

:Procluct Type I "lipo de proclucto. CASI NG SEAMLESS REVESTIMIENTO

Standard or Specification I Normas o especificaciones. EDITION

ISO 11960/5CT ,EIGHTH

Dimensions I Oimensiooes. 10 3/4 X 0.797 INCH 273.05 X 20.24 MM

l;;chedulc I Ct:'<lula IN/A

Heat/Colada:

I lotllote: I, Required I Requerido HRC

38838 Min: Max: SampleiMuestra: 55495 IZone!Zona: E2

Quadrant Aver

Cuadrante 1 2 3 Prom Var

1 00 46.6 48.3 469 473 Unit! Unidad MW 45.8 46.4 45.7 460

HRC 10 45.7 45.4 45.1 45.4 1.9 Pipe N" I Tubo N": 30102 ILs: B ISc: Q

Heal/Colada:

I Lot 1 Lote: I, Required I Requerido HRC

38848 Min: Max: SampfeiMuestra: 55497 I Zone/Zona: E2

Quadrant Aver

Cuaorame 1 2 3 Prom Var

1 00 46.5 47 .0 46.0 46.5 Unit I Unidad MW 44.9 46.2 47.0 46.0

HRC 10 47.6 46.7 46.8 47 0 1.0 Pipe w I Tubo N": 30331 ll.s: B Sc: Q

rlengtl1 I Longil.ud. 36.00 / 48.00 FT 10.97 /14.63 MTS

HeatJColada: I Lotllote: I, Required I Requcrido 38838 Min Max:

Sample!Muestra: 55495 I Zone/Zona: Quadrant Avc>:r

Cuadrante 1 2 3 Prom

2 00 45.2 45.9 45.1 45.4

Unit I Unidad MW 47.2 46.6 47.8 47.2

HRC 10 46.6 47.5 47.1 47.1 Pipe N• I l"ubo N": 30102 lb : B lsc:

HeatJCotada: I Lotllote: I, R~'Quired I Rt'Qucrido _38848 Min Max:

Sample/Muestra: 55497 I Zone/Zona:

Qua~ant Aver

Cuadrame 1 2 3 Prom

2 00 46.5 47.8 46.5 46.9 Unitt Unidad MW 45.6 46.8 47.0 46.5

HI~C 10 47.7 47.5 463 47.2 l'ipc WI Tubo N": 30331 ILs: B ISc:

'rhi$ ccf'tificato is ~d by a computcri.zcd system owd it fsv;)tkJ with cloctronic sign<!luw. On the orlgirH'd CC!flific:atc the trade--rna~ groon colored "reoaris'" is stamped. In case the owner of the oriQinaJ ccctlflutc! \'IIOukJ rcf1:<1SC ~ oopy of 1t. he must: 11tt.est it$ c:(.)(lformity to the origin~t one fai:.ing uoon himself the resi)Onsibifitv for an unlawful or not allowe<f ust!, Anv al(.cralioo 1.nC11or f<~ISificatiOn will t>e sutlieeu:!d to the law.

Steel Grade I Grado de acero. T951 PSL1 Quantity I Canticlad.

HRC Heat/Colada: I Lot/ Lote: t Required I Requclido 38838 Min Max:

E2 Sample/Mue.wa: 55495 I Zone/Zona: Quadrant Aver

var Cuadtante 1 2 3 Prom

3 00 45.4 47.1 47.0 46.5 Unit I Unidad MW 46.0 47.9 46.4 46.8

1.8 HRC 10 46.7 47.0 45.9 46.5

HRC

E2

Var

0.3 Q tii:Oe WI 'fubo N": 30102 lt.s: B JSc: Q

HRC H('.at/Colada: I Lotllote: II Required I Requerido HRC

38848 Min Max:

E2 . SarnoleJMuestra: 55497 I Zone/Zona: E2 Quadrant Aver

Var Cuadr<mte 1 2 3 Prom Var

3 00 45.3 47.2 46.7 46.4

Unit I Unidad MW 45.9 46.0 46.7 46.2 0.7 HRC 10 46.8 47.2 46 7 46.9 0.7

Q ipe N" /Tubo N": 30331 ls: B Sc: Q

SUlfacc I Superficie. VARNISHED BARNIZADO Ends I Extremos. TENARISHW

T ENARIS HW

Nominal Weight 1 Peso Nominal 85.30 LB/FT 126.19 KG/M

HcatJCotada: I Lot I Lote: lr Required I Requerido 38838 Min Max:

Sample!Muewa: 55495 IZoneiZona: Qua <kant Aver

Cuadrante 1 2 3 Prom

4 00 45.9 46.3 46.1 46.1

Unit I Unidad MW 45.8 46.7 45.9 46.1

HRC 10 45.2 45.1 45.6 45 .3 Pipe WI Tubo N": 30102. Its: B Sc:

fleat!Colada: I Lot /lote: lr Required I Requerldo 38848 Min Max: .

Sample/Mucstra: 55497 I Zone/Zona:

Quadrant Aver

Cuadrante . 1 2 3 Prom

4 00 45.6 45.3 46.7 45.9

. Unit I Unidad MW 46.3 46.7 46.4 46.5

H R C ll) 47.2 47.8 46.5 47.2 Pipe N' I Tubo N": 30331 lls: B ISc:

l:"j(>::a<Jo se cmtc mediante sistema compularizado yes validado con nnna ckl<vonior. fl ccrT.if~ado origifml posce impreso ellogo $ oolor vcl'dn. En C.'lSO cr. que el posccdor d~ ccrtificado cnt~ una copia. ck:bt.'f~ g.ararl.i.nw ta conformkJad con el original haci~ndosc 1sable oor c~lauicr uso {1(.~1 o indctlido. Cualquicr akeradon y/o ratsiffCecl6o l.-st.ara .~t<l a Ia lov.

HRC

E2

Var

0.8 Q

HRC

E2

var

1.3 0

OlCA 777 04 0

;;;;;;;;;;;;;; -- Tenaris Tubos de Acero de Mexico, S.A. Car ret. Mexico Veracruz Km 433.7 SN Delfino Valenzuela Tejerfa, Veracruz, Veracruz C.P. 91697 MEXICO

ATTACHMENT OF HARDNESS TEST AS QUENCHED

AND % OF MARTENSITE OBTAINED

Number I Numero

OP131707 Page I Pagi na: (52) 229 989 11 00 tel

(52) 229 989 1600 fax

4/4 oateiDia: May 08, 2008

Customer I Clicntc: (Customer's Order I Orden Cliente -Item N" 1450007.5404 ITf.M 1

(Customc( s Referencellleferencia del cliente ManufactUJ'Cr"s Works Order W I Confirmaci6n de Venta I 105248109

Mamrfacture Process 1 Proceso de fabr"IC3cion. SEAMLESS HOT ROLLED LAMINADO EN CALIENTE SIN COSTURA !

:Product Type I Tipo de producto. CASING SEAMLESS Rf.VESTIM IENTO

Standard or Specification I Normas o especificaciones. EDITION

ISO 1196015CT ,EIGHTH

Dim~'<lsions I Oimensiones. 103/4 X 0.797 INCH 273.05 X 20.24 MM

ISthedule I Cll<lula IN/A

HeatJColada :

I

Lot/late: II Required I Requerido HRC

38849 Min: Max: Sample/Mucstra: 55496 I Zone/Zona: E1

Quadrant Aver

Cuadrantc 1 2 3 Prom Var

1 00 467 47.2 45.4 46.4 Unit/ Unidad MW 46.4 46.6 45.4 46.1

HRC 10 46.9 47.2 46.8 470 0.9 Pipe N" /Tubo W: 30206 IL.: B Sc: Q

~~ I EZ: fnds of S.mpling I r:xrrcmo obtcru:lon mucw• Q: Qucru:hr.d I Templado Min: Minimum I Minimo Vat.: Variation I Vari2JciOn

!'length I Longitud. 36.00 I 48.00 FT 10.97 f 14.63 MTS

Heat/Colada: I lor /lore: I, Required I Requerido 38849 Min Max;

SampleiMucsl!a: 55496 !Zone/Zona: Quadrant Aver

Cuadrante 1 2 3 Prom

2 00 46.0 46.8 47.2 46.7 Unit/ Unidad MW 45.4 46.1 46.8 46.1

HRC 10 47.2 47.8 47.4 47.5 Pipe N" I Tubo N": 30206 ls: B ISC:

u; tocatroo d L'lc sample /Locart::adon de Ia mucstra 00: Outside Diameter I D~mctro Cxterno Max;·Maximum I Mallmo

l'his islo ocrtify that tho proc.Ju<:t desu itJJCJ h':to h;lS been manufactured. sampk!d. t~stc-d, and inspoc:tc-d in aOCOfdancc wtth purchase)" ocdor

requirements. Thlscertificate;s not a d(t;lilration or origin no- may it be used as adcc~aration of origif\.

hi'S tC.rtlfa tc is issued by a oompul<!f11..::d s~tcm and it is valid with cklctronK: signaLUIC. On lhc orl9:.0al t(~ificatc the tradc-maf1( green colored · rcnarls" is stamped. In cas<! the ~r ot the o~ioa! certificate would rclc~SC' a cop~· of it. he must attest' its conformity to tt1c ori9fna_l one taking uoon himself the resDOnsibiritv for any un!avd'ul or !'tOt ii!f!OY.oed use. A.m a!toration andtor rafs.ifac;:~tion will bo subicc:ted to the law.

Steel Grade I Grado de acero. T95 1 PSL1 Quantity I CantidOO .

HRC Heat/Colada: I 38849

lot I Lote:

El Samole/Muestra: 55496 Quadrant

II Requiced I Requerido HRC Min Max:

!Zone/Zona: E1 Aver·

Surface I Superfrcie. VARNISHED BARNI ZADO Ends I Extremos. TENARISHW

TENARIS HW

Nominal Weight I Peso Nominal 85.30 LBJFT 126.19 KG/M

.. ·.: .. " .

Heat/Colada: I Lot l lote:

38849 Samplc/Mucsl!a: 55496

Quadrant

. . . ~- ·~t .. : .. ·-· ~ ·' ·· ·.

Required I Requerido

Min Max: !Zone/Zona:

Aver

:;·:·

HRC

El

Var Cuadrante 1 2 3 Prom Var Cuadrante 1 2 3 Prom var

1.4 Q

3 OD 45.7 46.1 47.6 Unit/ Unidad MW 464 494 47.9

HRC 10 47.9 47.9 46 .8 Pioc N" I Tubo N' : 30206 lls: B

8~ Body I Cucrpo MW: Mi<ldiO WaH I CCOifO Aver.: Avcrag~

46.5 47.9

47.5 Sc:

4 00 45.8 46.4 Unit/ Unidad MW 47.9 466

1.4 HRC 10 478 47.7 Pipe N"/ Tubo N": 30206 Its:

Sc Specimen condition J ConditiOn de~ probola 10: bM:emal Diameter I Ofamctro lnremo Prom.: Promedio

Por ol pro!i<!nto ccrtllcamos que cl m_ateria.l ;)QUi dc.'Serito h.a sido fabficado. mU\."SUeado. cn~yado c 1nspeccionadcl de ao.n:((SO

a k:ls requis;tos de su ordcn de oo~ra. Es\c ccrtJficado no cs. ni j:lJe(JC w t.MdO:, como una dl>claracion de Otigan, ~

TFNAI-?IS UUALII Y LJI:.P,!\H I MI:.N I SIGNA I URIJ

47.8 46.7

46.6 47.0 48.4 48.0 B lk

Qt!AUTVCUHIFICI\TION DEPT. O:H IH 01· A , ·RTIFICATION DEPT.

1.3 Q

Df.PTO. 0~ Cf;RTif!CI\CION 0 ( Clll.IOAO

DE LA CRUZ MARTINEZ JOSE

RESPONSAll~ Ct. DEP. 0. Of.: CERTifiCACION UE CALIUAO

JUAN F"A-NCISCO RE.NATO AVI LA ALDAPA

cenificado se cmltc mediante sistema tomJ'llltMi't.ado y cs valitfado con rrma '*'<;uonica. tl ccnificaOO original poocc imp1CSO C4 1ogo $ oolor verdi':. En cz!j() de que cl posccdor del ccrtiticado cntrcguc IJ'Ia C<~ia. debcra garantil.ar Ia corlormidad con el orig'nal har.icndcr;c

. nsablc nor cualnui<.• uso ilt'<>al o indt'bido Cuak!uior ale<acklo /o fal<ificacinn cstara s..;cta a Ia lov.

I

DICA 717 04 0