BS 7191: 1989 be 624,096.4 : 624.014.2 660.14.016.201 969.14,018.62 : 621.791.011 British Standard Specification for Weldable structural steels for fixed offshore structures Aciers de construction soudables pour structures fixes en mer — Spécification Schweigbare Baustahle fir stationare Bauten im kiistonnahen Boreich j ‘NO COPYING WITHOUT RSI PERMISSION EXCEPT AS PERMITTED RY COPYRIGHT LAWgs 7191 : 1989 Foreword ‘Ths British Standard has been prepered under the direction Of the Iron and Steel Standards Policy Committee and specifies woldable structural ete for use in construction and in maintenance work tor offshore structures Tho standard Is adapted from BS 4360. It has been drafted in the form of a procurement specification and is intendea to be used by the purchaser and others acting on his behalt t0 procure materials for offshore structures designed to ‘operate in the European Sector. It specifies 2 more limited range of stee! forms and grades than BS 4360 and provides for enfiancad properties in some grades to reflect the needs of the European offshore industry. It also incorporates e number of options which the purchaser may invoke to meet demanding requirements in particular applications ‘The format and editorial style of BS 4360 has been utilized to the maximum extent possible ‘The new grade designations, which ave giver in appendix H of BS 4960 : 1986, and which will be adopted in the next {ull revision of that standard have been used but with an amended form of sub-grade suttix. Assessed capability. Users of this British Standard are advised to consider the desirability of assessment and registration of a supplier's quality systerns against the appropriate Part of BS 5760 by a third party certification body. Compliance with a British Standard dost not of ittolf confer immunity trom legal obiContents Page Foreword Inside front cover Committees cexpansibla Back cover Specification Section one. General 1 Scope 3 2 Definitions 3 23 General 2 4 Information to be supplied by the purchaser 3 5 Steelmaking and manutacturing process 4 6 Supply eoniion 4 7 Chemical composition and mechenical properties 4 8 Weldability data tor moditied grades ° 9 Quality of fnisod stoet 5 10 Identification of cast 8 11 Marking 7 12 Test certificates Q 13 Delivery 9 14 Mass of steel 9 Section two. Specific requirements for dimensional and shape tolerances 15 Tolerances for plates 10 16 Tolerances for sections end seamless tubulers 12 Section three. Specific requirements for testing 17 Salnetian aed identification of test samples for tensile and impact tests 13 18 Number of tense tests, 13 19 Direction and position of tensile test samples 13 20 Tensile test 8 21 Tensile west 13 22. Number of impact tests 1“ 23 Porition of impact tert samples 4 24 Impact test pieces 4 25 impact ests 4 26 Through-thickness testing for Z grades 15 27 Reteste 16 2 Wide plate and erack opening diplacnme {COD} data for modified arade paront plato 16 Section four. Specific raqutements for the chemical composition and mechanical propartias of weldable structural see plates 29 General ” Section five, Specific requirements for the chemical composition and mechanical pro Of weldable structural see sections a BS /191 = Section six. Specific requitements for the ‘chemical composition and mochanical propertios of weldabl ‘A. Comparison between grades in this standard and BS 4360 8 Options C Positions of test samples for tensile test D Position of test plece to be taken from tensile test sample when two rolled surfaces cannot be retained E Positions of test samples for impact tests F Weldability testing for moditled grades and mechanical testing of butt welds G Boad-on:plate weldability test for modified orades Tables 1 Maximum product GEV for plates. sections and less tubulars Length toleranoss for plates Width tolaranens for plates ‘Thickness tolerances for plates ‘Normal flatness tolerances for plates Maximum number of ripples/eorrugations in plate with thickness > 12 mm 7 Maximum number of ripples/corrugations in plate with thickness > 10 mm < 12 mm & Chemical composition for plates 9 Mechanical properties tor plates 10 Chemical composition for sections 11 Mechanical properties for sections 12 Chemical composition for seamless tubulart 13 Mechanical properties tor seamless tubulars 14 Plates: comparison between grades in this standard and BS 4360 15 Sections: comparison between grades in thie standard and BS 4360 1G Seamless tubulars: womparison between {grades in this standard end BS 4360 17 Restricted length and width tolerances tor plates 18 Thickness tolerances for plates: all over ordered thickne:t 19 Thickness tolerances for plates : all under ordered thickness 20 Special flatness tolerances for plates 21 Weldability tost requirements for butt welds 22 Mechanical test requirements for each butt weld 23 Bead-on: plate arc eneigy and prelieat conditions Page SRR BR 8B 2% 2 26 ze 28 2 3 46BS 7191 : 1989 Figures Plates: marking, die stamping and colour cading Rolled sections: marking. die stamping and colour coding ‘Seamless tubulars: marking, die stamping and clove ending Edge camber of plates Location of impact test pieces ‘Through-thicknoze tensile test piece locations ‘Through-thiokness tensile test piece locations within plate with thickness > 40 mm Positions of test samples for tunsily test Position of test piece to be taken from tensile test sample when two rolled surfaces cannot be retaines Page " 18 3t 31 2 10 " 2 13 18 18 7 Positions of test samples for impact tests Location of Charpy V-notch impact test pieces for plate butt weld Vickers hardness testing for plate butt weld ‘The HAZ regions in a single-bevel multi-pass weld ‘The HAZ regions in a single-hevel mul: pies weld with specific zones hightighted COD specimen sectioning details Plan view of polished section halves showing method to calculate GCHAZ percentage Detail of test plate and location of hardness indentation for bead on plate hardenability test Page a a2 £8 aSection one. General 1 Scope “This British Standard specities requirements for weldable structural steels to be used in the fabrication of fixed offshore structures in the form of plates, up to and includ: ing 180 mm thick, sections complying with BS 4848 Parts 2, 4 and 5 and 8S 4 : Part 1. and seamiess tubulars Up to and including 40 mm thick In the case of welded tubulars this standard covers only the requirements for parent material ‘Minimum yield strengths up to 450 N/m” are specified together with low-temperature impact properties at temperatures down to ~40 °C. ‘The standard is applicable to offshore structures designed ‘to operate in the European offshore sector but not to steel supplied for the fabrication of subsea pipelines, risers, [process equipment, process piping, and other utilities. It is primarily applicable to the North Sea Sector, but may also be applicable in other areas provided that due consideration Is given to local conditions, e.9. temperature. This standard applies to material supplied ex-mill (see 12.1) or from merchant's stock (see 12.2) NOTE, The tities of she publletions referred to in thir stendar are Tisted on the inside back cover 2 Definitions For the purposes of this British Standard the definitions siven in BS 6562 : Part 2 apply, together with the following. 2.1 parent produet. The product ralled from one piece of steel 2.2 manufacturer. The menufacturer of the steel products 2.3 supplier. The manufacturer of material supplied €ex-mill, either/or the merchant tor material supplied trom ‘a mercham’s stock (see clause 1) 2.4 purchaser. The purchaser or his representative. 2.5 controlled rolling. A generic term for ralling procedures in which the temperatures and deformation during rolling are controlled to achieve desirable material properties 2.8 thermo-mechanical controlled rolling (TMCR). A roll- {ng procedure in which significant deformation takes place ‘at temperatures below the normalizing range permitting litte, if any, recrystallization of austenite and conferring beneficial properties an the material. The properties conterred by TMCR cannot be reproduced by subsequent normalizing or other heat treatments 2.7 concast. Material produced by 2 continuous casting process route. BS 7191 : 1989 Specification. Section one 3 General 3.1. Grade designations The now grade designations given in appendix H of AS 4360 : 1986 have heen vied bust with amended sub: ‘rade suffixes as follows, Grade 275 Provious grade 43 Grade 355 Previous arede 50 Grade 450 Previvus yode 55 Suffix D Charpy V-notch test at -20 °C. (as BS 4360) Suttix E (Charpy V-noten test at “40 °C. {as BS 4360) Supplementary Substantial modification to suffix M. the nominally equivalent BS 4360 grade Supplementary With specified through suffix, thickness properties ‘This standard includes the following grades. 275D, 275E, 358D, 358E (minor changes to CEV and impact requirements only) 27562 Grades with few changes from BS 4360 Grade as above but with through-thickness properties Grades substantially modified 385EM, 355EMZ, from 8S 4360 450EM, 450EMZ Apnendix.A gives a comparison between grades in this standard and those in appendix H of BS 4360 : 1986, NOTE. Clauses in sis standara are applicable to al races except Where specifically marked to indicate that thay are apalicable only (othe substantially modified a or MZ grades 32 Steel products The steel products shall comply with the general require: ments of this standard and with the specific requirements ‘applicable to the grade concerned, Where any of the Cptions given in appendix B are celled up et the time of the enquiry and order, the steel products shall, in addition, ‘comply with the requirements of these options. 4 Information to be supplied by the purchaser ‘The following information shall be supplied by the purchaser at the time of enquiry and order. {a} Details of the product form, dimensions and quantity (b) The grade of steel (coe tables 8 to 13). (c} Whether use is for primary or secondary application.BS 7191: 1989 Section one 42 Options ‘A number of options are specified in appendix 8. in the ‘vent that the purchaser does not indicate his wish to implement any of these options and specify his require ments at the time of the enquiry and order, the suppl shall supply in accordance with the basic specification. See also option 8.1 5 Steelmaking and manufacturing process 5.1 Provest 5.11 Grades 275D, 275E, 3550 and A55F The steal shall bbe made by any process except the Bessemer process. 5.1.2 Modified grades 355EM and ASOEM. The steel shall bbe made by the basic oxygen or basic electric are furnace process. All steel shall be fully killed and made to fine grain practice 6.1.3 2 grades 276E2, I65EMZ and 4SOEM2. The stee! shall be made by a low sulphur and phosphorus refining Proeace in a hacia nwygan ar hacia alectria are furnace. All steels shall be fully killed and made to a fine grain practice ‘The steel for these grades shall be vacuum degessed or ladle refined. 5.2 Rimming stool Rimming steel shall not be supplied. 5.3 Limits end segregetion control for concast modified grades 5.3.1 Provided that the resultant products comply with all the relevant requirements of this standard, the maximum thickness limit for the use of the continuous casting process shall be at the manufacturer's diseretion ‘Soe also option B.2. 5.3.2 The minimum rolling reduction ratio of concaet ‘material for plate shall be 4:1 ‘Spe also option 8.3. 15.3.3 Slab produced by the continuous casting route shall be examined for centreline segregation. The frequency of ‘testing shall be once per strand per four casts. NOTE. No aceaptance lve are specified and the manufacturer soul agre wath the purchoser atthe tm of the enquiry and ‘Order, the position of texting andthe acceptance vlust for siphur printing, macro-etching or alternative methods of ehecking 5.4 Plate forming procedures for modified grades Plate forming procedures stall wut be supplied. See also options B.4 and B.S. 6 Supply condition (see also option 8.6) 6.1 Plates of grades 275 and 355 shall be supplied in the normalized condition. 6.2 Plates of grace 450 shall be roller quenched ant tempered, See also option 8.7 6.3 Sections of grades 275 and 356 over 25 mm thick shall be normelized. GA Seamless tubulars over 12.7 mm wall thickness ehall be supplied in the normalized condition except for grade 450 Which shall be supplied quenched and tempered, 7 Chemical composition and mechanical Properties (:cc elso option B.8) 7.4 Ladia analys TAA General, The chemival composition of the steel shall bbe determined by ladle analysis and shall be as given in tables 8, 10 and 12. ‘The manufacturer shall supply details of the ladle analysis to the purchaser and this shall be an average bated on at least three samples per cast. TAZ Residual element control for modified grades 355EM, 35SEMZ, 450EM, 450EMZ, Boron (B) shall not be intentionally added to the steel nor shall vanadium (V) {or plate of grades other than 450EM and 450EMZ. Elements other than those listed in tables 8, 10 ond 12 shall not be intentionally added. Calcium treatment shall Not be used without the permission of the purchaser, ‘except where required for the purgoses of Uesulphurization {sce calcium limits given in tables 8, 10 and 12) 7.2 Product analysis: “The product analysis shall comply with the limits given in ‘tables 8, 10 and 12 and, in the case of modified grades, shall aso be within the ranges proposed by the manufac: turor (coe 7.3). See also option B.B. Product analysis shall be determined twice per cast or once per 40 t, of part thereof, whichever is more stringent ‘The product analysis shall be determined on the test sample used for the verification of the mechanical properties (see section three) In the event of dispute, compliance with this standard shall be decided on the basis of an independent analysis using the methods described in BS 6200 : Part 3 or DSI llendbook No. 19, whichever is applicable,7.3 Carbon equivalent value (CEV) ‘The steel shell have maximum CLV, as given in table 1, based on product analysis and calculated using the follow. ing equation: Mo cey-c+ MO 6 Cr+ Mo+V | Ni+ Cu 5 15 7.4 Mechanical properties Mechanical propertias shall be at given in table 0 for plates, table 11 for sections and table 13 for seamless tubulars. NOTE. Ineividusl manutecturers are able to supoly stele with pecitiod minimum yield strengths slightly above thos specified in tables 9,11 and 13, Advantage may be taken ot such higher ole ifthe manufacturer can supply eutficiant property da This approach s adopted, all property values may be seed feoaraely withthe purchater 8 Weldability data for modified grades 440/mm in thiokness and Yor rolled sections and seamies tubulrs over 25 mm in thiknoe. At the time of the onquiry/order the manufacturer shell have available data on the weldability of his material ‘Any previously obtained data which the manufacturer proposes to submit shall have been verified by a competent third party, acceptable to the purchaser and who witnessed ‘the tests, All praviously obtained data presented shall bear ‘the manufacturer's stamp or seal. NOTE 2. These aata rater only to the weldobity of the mates being supplied and are intended for ute in development snd Preperation of fabrication procedures. If thew Gaty are unica thie tthe purchaer he should condor ation 2 BS 7191 : 1989 Section one 9 Quality of finished steel 9.1 Plates 9.1.1 Surface conaition. All surtaces shall be 100 % visually inspected, The surface condition shall comply with BS 6512 except as otherwise spacified in this clause. Plates shall be presented for inspection such that the steel surface can be readily examined. Weld repair by the manufacturer or supplier shall not be carried out. “The manufacturer may correct minor surface defects by grinding, but the area limitations given in 6.2.2.3 of BS 6512 : 1984 chall apply. Where defects are classified as type C in accordance with BS 6512, repair shall be followed by magnetic particle inspection ar dye penetrant inspection, 9.4.2 Internal soundins for grades other than modified ‘grades, For grades other than modified gredes, plates shel bbe deemed to comply with the internal soundness of grade LCT of BS BUM. NOTE, Unless seciied by the purchaser atthe time of ordering, ‘there ino obligtion onthe supplier to carryout ultrazone texting UUption 8.10 snouts be called up when ultrasonic testing 's required 10 be undertaken by the supplier. 9.1.3 Internat soundness for modified grades. The internal soundness of all plates shal be verified by ultrasonic testing in accordance with BS 5996 and shell comply with grade L4 of BS 5996 for MZ grades and grade LC3 of BS 5996 for M grades. Ultrasonic testing shall be carried ‘out in the final heat-treatment condition and with probe frequency of # MHz. ‘Table 1. Maximum product CEV for plates, sections and seemless tubulars Grade ‘Maximum CEV | Thickness % mm 2750 oat Up to and including 20 275E 27582 0.39 Up to and including 40 3550 0.43 Up to and including 20 365E 0.43 Up to and including 40 355EM 355EMZ | 0.43 Up to and including 40 04a (Over 40 up to and including 76 0.48, Over 78 up to and including 150 asuem asuemz | aaa Up to and including 75BS 7191 : 1989 Section one 9.2 Sections 9.2.1 Defects. All surfaces shall be 100 % visually inspected for defects. The material shall be sound and tree tram such internal and external defects or surface flaws as right preclude its use for the purpose for which it is intended. 9.2.2 Correction af minac defects. The manufacturer may remove minor surface defects by grinding but. in all cases, the thickness shall not be reduced locally by more than 3mm and the final thickness shall not be more than 4 % below the minimum otherwise allowed by 884 : Part 1 and 8S 4848 : Parts 4 and 5. “The total rectified area shall nat exceed 60.000 min* in any cone square metre (6 56 without specific approval ofthe purchaser 9.2.3 Repair by wolding. Weld repair shall only be carried fut with specifi anpraval of the purchaser. Where wold repaire are carried out, the defects chall be removed by grinding ar chipping followed by magnetic particle Inspection and then by weldina sublect r0 the following conditions. (2) After complete removal of the defect and before welding, the thickness shall not have been reduced 19, loss than 80 % of its nominal dimensions. (6) The welding shall be carried out in accordance with BS 5135 by operators approved to BS 4871 : Part 1 “The weld shall be ground smooth and flush with the adjacent surface of the product and subjected to non: destructive testing as specified by the purchaser. The manufacturer shall follow documented welding procedures established in accordance with BS 4870 Part 1 and approved by the purchaser which are appropriate for the material being welded. 8.24 Internal soundness tor moditied grades. Holled sections with & web thickness greater than 12 mm shall be subject to ultrasonic exemination of webs end flanges ‘when specified by tho purchaser and shall moet the require ments of grade Lot BS 5996, be mibject to agreement betwean the supplior and the purchoser (9.3. Soamtess eubul 19.3.1. Seamless tubulars shell be clean and free from such dofects as can be established by vieual inepection, ‘Visual inspection shall include the inside surface where practicable. 9.3.2 Surtace marks and impertections such as scabs. seams, wars, laps, slivers or gouges may be dressed by grinding and machining provided that the thickness of the seamless tube, after dressing, dovs not fall below the nom: inal thickness by more than the tolerance specified in 16.2. ‘Magnetic particle inspection shall he used to contirm removal of the detect. 9.3.3 All dressed areas shall blend smoothly into the contour of the seamless tube, 9.3.4 Seamless tubulars shall contain no dents greater then 3mm or 1 % of the outside diameter, whichever is the lesser, when measured as the gap between the lowest point Of the dent and a prolongstion of the original contour of the seamless tubular. The length of the dent in any direction shall not exceed 25 % of the soamlecs tubular outside dia meter. Al cold formed dents with a sharp bottom gouge shall be considered a defect and the gouge shall be removed by grinding. 9.3.5 All coamless tubulars shall be ultrasonically examined ‘une the full longth for laminar dafoets, The size of laminations shail be determined by manual ultrasonic examination and any seamless tubular containing a lamina: ‘hon exceeding 1000 mm? in area shall be deemed not ‘wo comply with this British Standard, 9.3.6 Ultrasonic testing of seamless tubulors sholl be carriad out for longitudinal defects and shall moot the supplementary requirements of API BL. except that the depth Df the referance notch shall be 5 % of the thickness, 9.4. Ultrasonic, magnetic particle and dye penetrant Inspection procedures For implementation of non-destructive testing procedures and evaluation. all personnel shall be qualified to CSWIP level 3.1.P to 3.4.P (CSWIP-UST-5), or equivalent as appropriate, Magnetic particle inspection personnel shall be qualified to CSWIP-MAGPEN 4 or equivalent. Where applicable ultrasonic testing shall he carried out in accordance with BS 5996, magnetic particle inspection (MPI) stall bu carried out ins acrordence with BS 6072, The manufacturer shall submit written ultrasonic and ‘magnetic particle inspection (MPI) and dye penetrant Inspection procedures tor approval prior to production of the order. These procedures stall include details of the following: (2) equipment t0 be used (0) calibration standards; (6) frequency of ealibration: (4) maintenance programmes; (e) opereter qualifications: (0) reporting procedures; (g) trequency and size of probes (ultrasonic testinal (h) measurement of field strength (MPI): {i) maximum ultrasonic seanning speed. ‘See alsv option B.11. 10 Identification of cast The manufacturer shall identify the ingots, hillats, slabs, plates, steel sections and seamless tubulars. etc. in such 4 way a3 (0 enable the finished steel to be ttaced to the ‘ost from which it was mode.11. Marking 11.1 Die stamping and paint marking 11.1.1 Generel. Die stamp digits shall be produced by round-nosed diee, shall be at least 8 mm high and ehall be ringed with white paint for ease of identification. ‘They shall be stamped on plates so that the letters are aligned at 90 ® to the principal direction of rolling. Peint ‘marking shall be in white with digits at least 40 mm high {All markings shall be located in accordance with figures 1 103, The following information shal be die stamped (a) east number; (b) if practicable, the suppliers piate/section/seamiess tubular number; NOTE. This may nor ne possible ar some secon is. Tis wt boa highlighted hy she suppor at tha time atthe enquiry and {c} type of sel and grade, (a) manufacturer's brand mark; {e) certifying authority stamp (where appropriate) The following information shall be paint marked (f) purchase order number: (g) item size (thickness, width, length, section identi cation, diameter and wall thickness, ete); (h) material grade, {0} principal rolling direction tor plates (arrow): UW) purchaser's unique identification number (where applicable). 11.1.2 Bundling. For sections, bundling may be carried out for sizes 203 mm and below, but shall be restricted to ‘material trom one cast. Where sections are to be used tor primary applications each individual section within a bundle shall be identified. When @ bundle is split for re-distribution the relevant identification marks, in accordance with items (a) to (e), shall be transterred +o the reconstructed bundles or to the individual items eppropriate. 8S 7191 : 1989, Section one 11.2 Colour coding Each plate shall be painted with either ane or two 50 mm wide diagonal bands, depending on the arade, extending over the edges in accordance with figure 1 Each section shall be painted with either one or two 50 mm. ‘wide bands, depending on the grade, along the longitudinal axis of the section and extending over the edges in accor: dance with figure 2. [NUIE. Inthe cate of bundled sections tie suticiant toad splashes of paint to the onde of the Bundles Only Sec also option B.12. Each seamless tubular shall be painted with either one or ‘wo 60 mm wide bands, depending on the grade, lngitudinally along the external surface and extending over ‘the edges as shown in figure 3. See also option B.12. Where two bands of the same colour are required they shall be separated by a minimum distance of 25 mm. The number and colour of bands shall be as follows: grade 40EMZ green green grade 450EM_—— green 5 grede S55EMZ blue blue grade 355EM blue - grade 35dE blue white grade 3550 blue yellow grade 275EZ red red grade 275E red S grade 2/50 unpainted — All paint for colour coding and stencil marking shall be applied to a clean, dry, ol: tree surtace and shal be able to resist weathering for at least 6 months andl shall be commercially free from cadmium, lead, zinc, copper and The colour used for colour coding and marking shall be in accordanes with the appropriate references of BS 5252, ‘as summarized below: blue 20651 green 2045 white ODES red 04653 yellow 10853. 11.3 Protective coatings Al materials shall be supplied without the addition of protective surface coatingsBS 7191 : 1989 Section one Marking {white paint )-—_ Colour of band(s) according to sleel Type — ie stamp (ringed with white paint), Z— text 90" to rolling direction Figure 1. Plates: marking, die stamping and colour coding (see clause 11) Marking (white paint)~— _Colour of band (s) according to steel type ie stamp Leinged with white paint) Macking (hite paint) __ Folaur af hand(s) arrarding Die stamp To steel lype Lenged with white paint?12 Test certificates 12.1. Ex mill supply One original ofall relevant certificates and reports, clearly {egible and in the English language shall be submitted to the purchaser at the time af desnatch ‘See also option B.13. SI units shall be used on ell documentation. ‘The mill certificates shall comply with DIN 50049 (3.1.8) and shall be acceptable to the certifying authority Thay shall contain at least the following information, {0} fsentiticotion, 02 follows: (1) mill location, (2) the purchaser's order and item number: (3) mathad of steel manufactur (4) heat or east number (6) bar, bloom or plate numbers (6) supply condition, (7) dimensior (@) grade of steel (0) Composition, 28 follows: (1) ladle analysis; (2) product analysis, (3) carbon equivatent. (c) Heat treatment, including details of heat treatment stating temperature, soaking times anu eooling method; NOTE, Records should be walabie ot de il ur period to bh arnt with the purchaser (4) Mechanical properties, as follows: (1) vield steength, tensile strongth, yield strength/ tensile strength ratio, elongation; (2) Charpy V-notch impact test results; (3) through thickness properties {if required); (4) serain age test results (if required). (e} Nominal mass (8) Non-clestructive test (NDT) results, as follows: (1) verification of results of NDT are to be included fon the test enrtificate; (2) the manufacturer's own retults of NDT are tn he endarend hy an operator approved under CSWIP-UST'5 or equivalent; (3) details of segregation control monitoring are to be given in a separate report. BS 7191 : 1989 Section one In addition to items (a) to (f), the analysis of residual elements and the results of any additional testing deemed necessary by the Purchaser shall be submitted in the form of separate reports 12.2 Marchant supply If any tol ie supplied from a merchant's stack, ‘the merchant shall be responsible tor the following. (a) Supplying to the purchaser a copy of the original fadar requirements placed on the mill and the subse ‘quent sales history of the product. (b) Supplying to the purchaser all documentation required by vis standard including an vriyiiel wpy of the mill certificate (see 12.1) or a copy verified by the certification authority, (c) Satisfying the purchaser by means of numbers or Identification marks on the steel (or tab when parcels of steel are bundled) that such steel has buen tested and complies with this standard, as applicable to the material specified, particularly where the dimensions CF condition of the steel have been altered. 13 Delivery ‘At least 1 week prior to the start of delivery the supplier shall confirm with the purchaser the place for delivery of Uw sel ‘Steel shall be delivered together with an sccumpuniying advice note which shall contain the following minimum information: (2) mill location; (b) the purchaser's purchase order anu itern number, (6) cast number: (a) toct/plate number; {e) the plate/seamless tubular/section sizes; (1) the material rade. 14 Mass of steel The mass ot plates, sections or seamless tubulars shall be calculated on the Lasis that the steel has a Uensity of 7850 kg/m?BS 7191 : 1989 Section two Section two. Specific requirements for dimensional and shape tolerances 15 Tolerances for plates 15.1 General Tolerances for plates produced on continuous mills shall comply with BS 1449 : Part 1 Tolerances tor plates produced on non-continuous mills shall comply with 18.2 t0 15.6. 16.2 Length tolerances for plates The length tolerances on ordered length for plates shall be {2s given in table 2. The length of a plate shall be taken as ‘the langth of the largest rectangle contained within the plate. ‘Seo also option 8.14. “Table 2. Length tolerances for plates Ordered eth Toluene Less than 4 000 ce “0 4000 to les than 6 000 2 6000 to less than 8 000 24 £8 000 roles than 10 000 3, 10 000 to less than 1B OOD 3 18.000 up to and including 20.000. | 59,5 16.3 Width tolerances for plates ‘The width tolerances on ordered width for plater shall be {¢ given in table 3. Width shall be measured perpendicular to the major axis ot the plate. Table 3. Width tolerances for plates dred width Tolerances mm mam 600 to tess than 2 000 % 2.000 to less than 3.000 a 3.000 up to and inetuding 4000 | 2, 18.4 Thickness tolerances ‘The thickness Lolerances on ordered thickness of plates shall be as given in table 4. Thickness shall be measured at any point more than 15 mm from the edges of the plata Seo also options 8.16 and B.16. 15.5 Edge camber for plates alge camhor chall he limitad en that it chall he pnecibie to inscribe the dimensions of the ordered plate within the delivered size. The edge camber, C, shall be taken as the ‘maximum deviation between one longitudinal edge and the straight line joining the two ende of thie edge (coe figure 4) 16.6 Flatness tolerances for plates Tro flatness tolerances for plates shall not exceed the ‘normal flatness tolerances given in table 6 tor the straight: ‘edge selected except that, for thicknesses of 50 mm and ‘over, the flatness tolerance shall be based on a straightedge Fangth of 2000 mm forall directions To measure flatness, the plate resting under its own weight hall be placed on 2 flat horizontal surface. Deviations with respect to flatness shall be determined by measuring the distance between the plate and a straightedge resting on the plate, the straightedge being placed in any direction See aso option B.14. ‘able 4. Thickness tolerances for plates Ordered thickness - Width of plate (in mm) Upto and | Over 000 | Gver2 600] Over 2 000] Over 600 incivsing | upto and. | upto and | upto ana | upto ana 2000 | Incleding | ineuding | Including] Incuding Tso” | S000” | 3300" | «000 Less than 5 +040 |£050 +050 |- : 5 to less than 8 2045 [+060 |+080 | soar 8 to less than 26 +056 [06s |+080 |+085 | +0095 26 to lee than 40 +055 |2070 |+080 |+085 |+095 40 t0 lees than 80 +060 |+080 |+085 [2095 [+105 80 upto and including 160] 21.10 [21.15 | #120 |2125 | 21.25