SIST EN 10305-3:2010
(Main)Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes
Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes
This European Standard specifies the technical delivery conditions for welded cold sized steel tubes of circular cross section for precision applications with specified outside diameter D ≤ 193,7 mm. NOTE This document may also be applied to other types (excluding square and rectangular) of cross section. Tubes according to this document are characterized by having precisely defined tolerances on dimensions and a specified maximum surface roughness. Typical fields of application are in the vehicle, furniture and general engineering industries.
Präzisionsstahlrohre - Technische Lieferbedingungen - Teil 3: Geschweißte maßgewalzte Rohre
Diese Europäische Norm enthält die technischen Lieferbedingungen für geschweißte maßgewalzte Präzisionsrohre
aus Stahl mit kreisförmigem Querschnitt und einem Nennaußendurchmesser D ≤ 193,7 mm.
ANMERKUNG Dieses Dokument darf auch für andere (mit Ausnahme quadratischer und rechteckiger) Querschnittsarten
angewendet werden.
Rohre nach diesem Dokument sind durch genau definierte Grenzabmaße und eine festgelegte maximale
Oberflächenrauheit charakterisiert. Typische Anwendungsgebiete sind der Fahrzeugbau, die Möbelindustrie
und der Allgemeine Maschinenbau.
Tubes de précision en acier - Conditions techniques de livraison - Partie 3: Tubes soudés calibrés
La présente Norme européenne spécifie les conditions techniques de livraison pour les tubes en acier soudés calibrés à froid, de section circulaire, destinés aux applications de précision avec un diamètre extérieur spécifié D =< 193,7 mm.
NOTE Le présent document peut aussi s'appliquer à d'autres types de section (à l'exclusion des carrés et rectangulaires).
Les tubes conformes au présent document se caractérisent par des tolérances dimensionnelles précises et par une rugosité maximale spécifiée. Les domaines typiques d'application se situent dans le secteur automobile, l'ameublement et l'ingénierie générale.
Jeklene cevi za precizno uporabo - Tehnični dobavni pogoji - 3. del: Varjene hladno dimenzionirane cevi
Ta evropski standard opredeljuje tehnične pogoje dostave za varjene hladno dimenzionirane cevi okroglega prereza za natančno uporabo z določenim zunanjim premerom ≤ 193,7 mm. OPOMBA: Ta dokument lahko velja tudi za druge vrste prerezov. Cevi so s tem dokumentom določene tako, da imajo natančno opredeljena odstopanja pri dimenzijah in določeno najvišjo površinsko hrapavost. Značilna področja uporabe so v avtomobilski, pohištveni in splošnih inženirskih industrijah.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Präzisionsstahlrohre - Technische Lieferbedingungen - Teil 3: Geschweißte maßgewalzte RohreTubes de précision en acier - Conditions techniques de livraison - Partie 3: Tubes soudés calibrésSteel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes77.140.75Jeklene cevi in cevni profili za posebne nameneSteel pipes and tubes for specific useICS:Ta slovenski standard je istoveten z:EN 10305-3:2010SIST EN 10305-3:2010en01-marec-2010SIST EN 10305-3:2010SLOVENSKI
STANDARDSIST EN 10305-3:20031DGRPHãþD
SIST EN 10305-3:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 10305-3
January 2010 ICS 77.140.75 Supersedes EN 10305-3:2002English Version
Steel tubes for precision applications - Technical delivery conditions - Part 3: Welded cold sized tubes
Tubes de précision en acier - Conditions techniques de livraison - Partie 3 : Tubes soudés calibrés à froid
Präzisionsstahlrohre - Technische Lieferbedingungen -Teil 3: Geschweißte maßgewalzte Rohre This European Standard was approved by CEN on 22 November 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10305-3:2010: ESIST EN 10305-3:2010
EN 10305-3:2010 (E) 2 Contents Page Foreword .31Scope .42Normative references .43Terms and definitions .54Symbols .65Classification and Designation .65.1Classification .65.2Designation .66Information to be supplied by the purchaser .66.1Mandatory information .66.2Options .76.3Example of an order .87Manufacturing process .87.1Steelmaking process .87.2Tube manufacture and delivery conditions .88Requirements .98.1General .98.2Chemical composition .98.3Mechanical properties . 108.4Appearance and internal soundness . 118.5Dimensions and tolerances . 129Inspection . 169.1Types of inspection . 169.2Inspection documents . 169.3Summary of inspection and testing . 1710Sampling . 1810.1Test unit . 1810.2Preparation of samples and test pieces . 1911Test methods . 1911.1Tensile test . 1911.2Flattening test . 1911.3Drift expanding test . 2011.4Dimensional inspection . 2111.5Roughness measurement . 2111.6Visual examination . 2111.7Non-destructive testing . 2111.8Retests, sorting and reprocessing . 2112Marking . 2113Protection and packaging . 22Bibliography . 23 SIST EN 10305-3:2010
EN 10305-3:2010 (E) 3 Foreword This document (EN 10305-3:2010) has been prepared by Technical Committee ECISS/TC 110 “Steel tubes, and iron and steel fittings”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2010, and conflicting national standards shall be withdrawn at the latest by July 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 10305-3:2002. EN 10305, Steel tubes for precision applications
Technical delivery conditions, consists of the following parts: Part 1: Seamless cold drawn tubes Part 2: Welded cold drawn tubes Part 3: Welded cold sized tubes Part 4: Seamless cold drawn tubes for hydraulic and pneumatic power systems Part 5: Welded cold sized square and rectangular tubes Part 6: Welded cold drawn tubes for hydraulic and pneumatic power systems According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 10305-3:2010
EN 10305-3:2010 (E) 4 1 Scope This European Standard specifies the technical delivery conditions for welded cold sized steel tubes of circular cross section for precision applications with specified outside diameter D ≤ 193,7 mm.
NOTE This document may also be applied to other types (excluding square and rectangular) of cross section. Tubes according to this document are characterized by having precisely defined tolerances on dimensions and a specified maximum surface roughness. Typical fields of application are in the vehicle, furniture and general engineering industries. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10020:2000, Definition and classification of grades of steel EN 10021:2006, General technical delivery conditions for steel products EN 10027-1, Designation systems for steels — Part 1: Steel names EN 10027-2, Designation systems for steels — Part 2: Numerical system EN 10052:1993, Vocabulary of heat treatment terms for ferrous products EN 10168, Steel products — Inspection documents — List of information and description EN 10204, Metallic products — Types of inspection documents EN 10246-11), Non-destructive testing of steel tubes — Part 1: Automatic electromagnetic testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for verification of hydraulic leak-tightness EN 10246-32), Non-destructive testing of steel tubes — Part 3: Automatic eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of imperfections EN 10246-53), Non-destructive testing of steel tubes — Part 5: Automatic full peripheral magnetic transducer/flux leakage testing of seamless and welded (except submerged arc welded) ferromagnetic steel tubes for the detection of longitudinal imperfections
1) Under revision to become EN ISO 10893-1, Non-destructive testing of steel tubes
Part 1: Automated electromagnetic testing of seamless and welded (except submerged arc-welded) steel tubes for the verification of hydraulic leak-tightness instead of the hydrostatic test (ISO/DIS 10893-1:2009). 2) Under revision to become EN ISO 10893-2, Non-destructive testing of steel tubes
Part 2: Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of imperfections (ISO/DIS 10893-2:2009). 3) Under revision to become EN ISO 10893-3, Non-destructive testing of steel tubes
Part 3: Automated full peripheral flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal and/or transversal imperfections (ISO/DIS 10893-3:2009). SIST EN 10305-3:2010
EN 10305-3:2010 (E) 5 EN 10246-74), Non-destructive testing of steel tubes — Part 7: Automatic full peripheral ultrasonic testing of seamless and welded (except submerged arc welded) tubes for the detection of longitudinal imperfections EN 10246-85), Non-destructive testing of steel tubes — Part 8: Automatic ultrasonic testing of the weld seam of electric welded steel tubes for the detection of longitudinal imperfections EN 10256, Non-destructive testing of steel tubes — Qualification and competence of level 1 and 2 non-destructive testing personnel EN 10266:2003, Steel tubes, fittings and structural hollow sections — Symbols and definitions of terms for use in product standards EN ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing (ISO 377:1997) EN ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels (ISO 2566-1:1984) EN ISO 4287, Geometrical product specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters (ISO 4287:1997) EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1:2009) EN ISO 8492, Metallic materials — Tube — Flattening test (ISO 8492:1998) EN ISO 8493, Metallic materials — Tube — Drift-expanding test (ISO 8493:1998) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 10020:2000, EN 10021:2006,
EN 10052:1993, EN 10266:2003 and the following apply. 3.1 employer organization for which a person works on a regular basis
NOTE The employer can be either the tube manufacturer or a third party organization providing non-destructive testing (NDT) services. 3.2 manufacturer party to produce and to deliver tubes in accordance with this document NOTE Where tubes are delivered by a supplier, see EN 10021:2006, Clause 6. 3.3
imperfection discontinuity in the wall or on the pipe surfaces detectable by methods described in this document
4) Under revision to become EN ISO 10893-10, Non-destructive testing of steel tubes
Part 10: Automated full peripheral ultrasonic testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of longitudinal and/or transversal imperfections (ISO/DIS 10893-10:2009). 5) Under revision to become EN ISO 10893-11, Non-destructive testing of steel tubes
Part 11: Automated ultrasonic testing of weld seam of welded steel tubes for the detection of longitudinal and/or transversal imperfections (ISO/DIS 10893-11:2009). SIST EN 10305-3:2010
EN 10305-3:2010 (E) 6 NOTE Imperfections with a size complying with the acceptance criteria specified in this document are considered to have no practical implication on the intended use of the product. 3.4 defect imperfection of a size not complying with the acceptance criteria specified in this document NOTE Defects are considered to adversely affect or limit the intended use of the product. 3.5 parent coil coil originating from the hot rolling process prior to any subsequent operation (pickling, slitting, cold rolling or coating) 4 Symbols For the purposes of this document, the symbols in EN 10266:2003 apply. 5 Classification and Designation 5.1 Classification In accordance with the classification system in EN 10020 the steel grades given in Table 2 are non-alloy quality steels. 5.2 Designation For the tubes covered by this document the steel designation consists of the number of this document (EN 10305-3) plus either: a) the steel name in accordance with EN 10027-1; or
b) the steel number in accordance with EN 10027-2. 6 Information to be supplied by the purchaser 6.1 Mandatory information The following information shall be obtained by the manufacturer at the time of enquiry and order: a) the quantity (mass or total length or number); b) the term “tube”; c) the dimensions (see 8.5.1); d) the steel designation (see 5.2); e) the delivery condition including the surface condition (see 7.2.1 and 7.2.2); f) the length and the type of tube length (see 8.5.2). SIST EN 10305-3:2010
EN 10305-3:2010 (E) 7 6.2 Options A number of options are specified in this document and these are listed below. In the event that the purchaser does not indicate his wish to implement any of these options at the time of enquiry and order, the tubes shall be supplied in accordance with the basic specification (see 6.1). 1) specification of a steel grade not specified in this document (see 8.2); 2) suitability for hot-dip galvanizing (see 8.2); 3) surface condition for further processing (see 8.4.1); 4) removal of internal weld bead (see 8.4.2); 5) measurement of surface roughness (see 8.4.4); 6) specific surface roughness (see 8.4.4); 7) non-destructive testing of the weld seam for the detection of longitudinal imperfections (see 8.4.8); 8) non-destructive testing of the full tube circumference for the detection of longitudinal imperfections (see 8.4.8); 9) non-destructive testing for verification of leak-tightness (see 8.4.8); 10) specification of a procedure to test transverse welds for the detection of imperfections (see 8.4.8); 11) specification of a cross section other than circular (see 8.5.1.1); 12) reduced diameter tolerances (see 8.5.1.2); 13) unilateral diameter tolerance (see 8.5.1.2); 14) reduced wall thickness tolerance (see 8.5.1.3); 15) unilateral wall thickness tolerance (see 8.5.1.3); 16) another specified length and/or tolerance (see 8.5.2); 17) tolerance for exact lengths ≤ 500 mm or > 8 000 mm (see 8.5.2); 18) reduced maximum deviation from straightness (see 8.5.3); 19) specified end finishing (see 8.5.4); 20) inspection certificate 3.1 (see 9.1 and 9.2.1); 21) inspection certificates 3.2 (see 9.2.1); 22) flattening or drift expanding test for delivery condition +A or +N (see Table 9); 23) test unit with tubes from one cast
only (see 10.1); 24) more restrictive requirement on flattening test (see 11.2); 25) alternative marking (see Clause 12); 26) delivery without corrosion protection (see Clause 13); SIST EN 10305-3:2010
EN 10305-3:2010 (E) 8 27) specified corrosion protection (see Clause 13); 28) unbundled tubes or specific method of packaging (see Clause 13). 6.3 Example of an order 12 000 m tube with an outside diameter of 40 mm and a wall thickness of 1,5 mm in accordance with this document, made of steel grade E235 in the normalized condition, pickled, to be delivered in standard lengths of 6 m with an 3.1 inspection certificate in accordance with EN 10204. 12 000 m tubes – 40 x 1,5 – EN 10305-3 – E235+N, S2 – 6 m standard length – Option 20 7 Manufacturing process 7.1 Steelmaking process The steelmaking process is at the discretion of the manufacturer with the exception that the open hearth (Siemens-Martin) process shall not be employed unless in combination with a secondary steelmaking or ladle refining process. Steels shall be fully killed. NOTE This excludes the use of rimming, balanced or semi-killed steel. 7.2 Tube manufacture and delivery conditions 7.2.1
The tubes shall be manufactured from strip by electric welding. The tubes shall not contain strip end welds except for tubes to be supplied coiled for which the delivery conditions +A or +N may be specified.
Possible surface conditions are: a) S1 (black); b) S2 (pickled); c) S3 (cold rolled); d) S4 (coated to an agreed condition). NOTE The surface conditions S1 and S3 apply for the strip. The surface condition S2 and S4 may apply for the strip or the tube; the purchaser should, where necessary, indicate the required condition at the time of enquiry and order. 7.2.2
Tubes made of the steel grades E155, E195, E235, E275 and E355 shall be supplied in the delivery condition +CR1 or +A or +N (see Table 1). Tubes made of the grades E190, E220, E260, E320, E370 and E420 shall be supplied in the delivery condition +CR2. 7.2.3
All non-destructive testing (NDT) activities shall be carried out by qualified and competent level 1, 2 and/or 3 personnel authorized to operate by the employer.
The qualification shall be in accordance with EN 10256 or, at least, an equivalent to it. It is recommended that the level 3 personnel be certified in accordance with EN 473 or, at least, an equivalent to it. The operating authorization issued by the employer shall be in accordance with a written procedure. NDT operations shall be authorized by a level 3 NDT individual approved by the employer. SIST EN 10305-3:2010
EN 10305-3:2010 (E) 9 NOTE The definition of levels 1, 2 and 3 can be found in appropriate standards, e.g. EN 473 and EN 10256. Table 1 — Delivery conditions Designation Symbola
Description Welded and cold sized +CR1
Normally not heat treated, but suitable for final annealing. b +CR2
Not intended for heat treatment after the welding and sizing. c Soft annealed +A After welding and sizing the tubes are annealed in a controlled atmosphere. Normalized +N After welding and sizing the tubes are normalized in a controlled atmosphere. a In accordance with EN 10027-1. b After annealing or normalizing, the resulting mechanical properties meet the requirements specified in Table 4 for the delivery condition +A or +N, respectively.
c If further heat treatment is applied, the resulting mechanical properties may be outside the specified
requirements. 8 Requirements 8.1 General The tubes, when supplied in a delivery condition indicated in Table 1 and inspected in accordance with Clauses 9, 10 and 11, shall comply with the requirements of this document. In addition, the general technical delivery requirements specified in EN 10021 apply. 8.2 Chemical composition The cast analysis reported by the steel producer shall apply and comply with the requirements of Table 2. A steel grade not specified in this document may be specified (see option 1). Option 1:
A steel grade not specified in this document with a maximum total content of alloying elements of
5 % and agreed chemical composition, mechanical properties and delivery condition, is specified. NOTE When subsequently welding tubes produced in accordance with this document, account should be taken of the fact that the behaviour of the steel during and after welding is dependent not only on the steel composition and the delivery condition, but also on the conditions of preparing for and carrying out the welding. Option 2: The composition of the specified steel grade shall be such that it is suitable for hot-dip galvanizing (see e.g. EN ISO 1461 for guidance). SIST EN 10305-3:2010
EN 10305-3:2010 (E) 10 Table 2 — Chemical composition (cast analysis)a Steel grade in % by mass Steel name Steel number C max. Si max. Mn max. P max. S max. Altotal b min. E155 1.0033 0,11 0,35 0,70 0,025 0,025 0,015 E190 1.0031 0,10 E195 1.0034 0,15 0,35 0,70 0,025 0,025 0,015 E220 1.0215 0,14 E235 1.0308 0,17 0,35 1,20 0,025 0,025 0,015 E260 1.0220 0,16 E275 1.0225 0,21 0,35 1,40 0,025 0,025 0,015 E320 1.0237 0,20 E355
1.0580 0,22 0,55 1,60 0,025 0,025 0,020 E370 1.0261 0,21 E420 1.0575 0,16 0,50 1,70 0,025 0,025 0,020 a Elements not included in this table (but see footnote b) shall not be intentionally added to the steel without the agreement of the purchaser, except for elements which may be added for the purposes of deoxidation and/or nitrogen binding. All appropriate measures shall be taken to prevent the addition of undesirable elements from scrap or other materials used in the steel making process. b This requirement is not applicable provided the steel contains a sufficient amount of other nitrogen binding elements, such as Ti, Nb or V. When using titanium, the manufacturer shall verify that (Al + Ti/2) ≥ 0,020. Additions of Nb, Ti and V are permitted at the discretion of the manufacturer. The content of these elements shall be reported. Table 3 specifies the permissible deviations of product analysis from the specified limits on cast analysis given in Table 2. Table 3 — Permissible deviations of the product analysis from the specified limits on cast analysis given in Table 2 Element Limiting value for cast analysis in accordance with Table 2 % by mass Permissible deviation of the product analysis
% by mass C ≤ 0,22 + 0,02 Si ≤ 0,55 + 0,05 Mn ≤ 1,70 + 0,10 P ≤ 0,025 + 0,005 S ≤ 0,025 + 0,005 Al ≥ 0,015 - 0,005 8.3 Mechanical properties The mechanical properties of the tubes shall conform to the requirements of Tables 4 and 5 and, if applicable, 11.2 or 11.3. SIST EN 10305-3:2010
EN 10305-3:2010 (E) 11 NOTE Subsequent processing (cold or hot) may change the mechanical properties. Table 4 — Mechanical properties at room temperature for the delivery conditions +CR1, +A and +N Steel grade Minimum values for the delivery conditiona
+CR1b, c
+Ac +N Steel name Steel number Rm MPa A % Rm MPa A % Rm MPa ReHd
MPa A % E155 1.0033 290 15 260 28 270 to 410 155 28 E195 1.0034 330 8 290 28 300 to 440 195 28 E235 1.0308 390 7 315 25 340 to 480 235 25 E275 1.0225 440 6 390 22 410 to 550 275 22 E355 1.0580 540 5 450 22 490 to 630 355 22 a Rm: tensile strength; ReH: upper yield strength (but see 11.1); A: elongation after fracture. For symbols for the delivery condition see Table 1. b Depending on the degree of cold forming the strip material and sizing the as welded tube, the yield strength may nearly be as high as the tensile strength. For calculation purposes yield strength values of ReH ≥ 0,7 Rm are recommended in the +CR1 condition. c The mechanical properties and technological properties of the weld zone may, in the case of the delivery conditions +CR1 and +A, differ from those of the base material. d For tubes with outside diameter ≤ 30 mm and wall thickness ≤ 3 mm the ReH minimum values are 10 MPa lower than the values given in this Table. Table 5 — Mechanical properties (minimum values) at room temperature
for the delivery condition +CR2a Steel grade Tensile strength Yield strength Elongation after fracture Steel name Steel number Rm MPa ReH MPa A % E190 1.0031 270 190 26 E220 1.0215 310 220 23 E260 1.0220 340 260 21 E320 1.0237 410 320 19 E370 1.0261 450 370 15 E420 1.0575 490 420 12 NOTE The mechanical and technological properties of the weld zone may differ from those of the base material. a For the symbol for the delivery condition see Table 1. 8.4 Appearance and internal soundness 8.4.1
The internal and external surface finish of the tubes shall be typical of the manufacturing process and, where applicable, the heat treatment employed.
Option 3: A surface condition suitable for special further processing is specified by the purchaser. SIST EN 10305-3:2010
EN 10305-3:2010 (E) 12 Normally, the finish and surface condition shall be such that any surface imperfections requiring dressing can be identified. Any surface imperfections, which in accordance with the manufacturer's experience might be considered defects as specified in 8.4.5, shall be dressed in accordance with 8.4.6, or the tube or part of tube shall be rejected. 8.4.2
The external weld bead shall be removed flush with the surface. The height of the internal weld is not limited, unless option 4 is specified. Option 4:
The height of the internal weld bead shall not exceed a specified value or be removed. The wall thickness in the weld area shall not be lower than the specified minimum wall thickness. 8.4.3
Outside the weld area, the roughness on the outside surface shall be: Ra ≤ 4 µm.
8.4.4
Verification of surface roughness and/or improved levels of roughness may be specified (see options 5 and 6). Option 5: The surface roughness shall be measured in accordance with 11.5 and reported. Option 6: A specific surface roughness of agreed type and limiting value is specified. The roughness shall be measured and reported. 8.4.5
Surface imperfections which encroach on the specified minimum wall thickness shall be considered defects and tubes containing these shall be deemed not to conform to this document.
8.4.6
It shall be permissible to dress, only by grinding or machining, surface imperfections provided that, after doing so, the wall thickness in the dressed area is not less than the specified minimum wall thickness. All dressed areas shall blend smoothly into the contour of the tube. 8.4.7
Tubes in the delivery condition +A or +N shall be free of loose scale but may show discoloration. 8.4.8
Verification of internal soundness by non-destructive testing may be specified by the purchaser (see options 7 to 9). Option 7: Non-destructive testing of the weld seam for the detection of longitudinal imperfections shall be carried out in accordance with 11.7.1 is specified. Option 8: Non-destructive testing of the full tube circumference for the detection of longitudinal imperfections shall be carried out in accordance with 11.7.1 is specified. Option 9: Non-destructive testing for verification of leak tightness shall be carried out in accordance with 11.7.2. Strip end welds on tubes to be supplied coiled shall be subjected to an additional testing. The testing method is
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