Pipe parameters could be divided into three main groups: • dimensions and their tolerances (depending upon the tube manufacturing method). • steel grade and
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2ContentsCommittee for standardization and standard..3 Steel tubes – classification and terminology3 Technical standards of steel tubes3 Production programm – products classification by application.4 Production flow chart in Železiarne Podbrezová..6 Review of basic characteristics of steel tubes..8 Tube dimensions.8 Steel for tubes..8 Technical delivery conditions (TDC) of tubes (excludes tes ting)..10 Tube te sting .10 Quality management system, certification, legislation.12 Product section..13 Conversion table..69 Supplements:Packaging of tubes and pipes ..109 Mechanical and technological tes ting of tubes and pipes . 110 Informationelly comparison of steels112 Conversion table for hardness and tensile strength.123 Summary of technical delivery conditions for groups of tubes according to purpose of application. ..124 Note: Page numbers of actual product sort and groups – see production programm on the page 4–5.Special tables and reference Carbon equivalent formula 14 Hot dip zinc coating of steel pipes 15 Leakage test according to standards ASTM A (ASME SA) 23 Pressure equipment and legislation in EN .25 Dimension tolerances according to ISO 1129 …………………………………………..………….. ..27 Ovality, eccentricity………………………………………………………………………………………27 Tolerances according to standards ASTM A 530 and A 999 …………………………….……… ..…29 Conversion table of inch and decimal values …………………………………………………….…30 Standard wire gauge for wall thickness ………………………………………………….………..……30 Tolerances according to standards ASTM A 450 and A 1016 ..……………………..…… …….……33 NDE of boiler tubes according to standards ASTM …………………………………………………39 Condition and heat treatment terminology of precision tubes ……………………..…………….……63 Mechanical Tubing according to ASTM A – sizing methods and thermal treatments ………. ..…..…89 Preparation of ends ………………………………………………………………………………..…….98 NACE International Standards …………………………………………………………………..…….9 9Dear customers, dear ladies and gentlemen, we prepare this technical tube guide with the wiew of continual development of our firm mutual business relations. Tube guide i ncludestechnical data of steel tubes and tube semi-products, made in company Železiarne Podbrezová. Technical data are included in nat ionaland worl-wide standards or regulations, or bilateral technical delivery conditions and terms. Application of tube products have to be in compliance with particular law and rules, concerning safety, healt protection and environment. For this reason is short standardisation survey listed in handbook.Attention: In the countries of European Union there were European standards (EN) adapted into the system of national standards. Previous standards are not valid by now. Previous standards should not be used in commercial communication for this reason, but valid EN standards. Data from previous standards, shown in surveys, during temporary period support the comparison of individual tube parameters,older technical documentation study, possible tube alternative to previous standards finding e.t.c. GOST, USA (ASTM,ASME, ANSI,API ) and JIS standards are still valid.
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3Committee for standardization and standard International, worldwide recognized actual standards are issued by two st andardization ins titutions resident in Geneva: ISO (International Standards Organization) – issu-ing universal standards IEC (International Electrotechnical Commision) – is-suing electrotechnic standards ISO standards are accepted worldwide and therefore they usu- ally do not go trough the national standard systems. For steel tube they are applied rarely. ISO numbers are in brackets. European standardization European standardization is analogous to global system, but it con- sist of three committees. Two first resident in Brusel, the third one in Sophia Antipolis (France): CEN (Comité Européen de Normalisation) – issuesuniversal standards. Standards regarding iron and steel are isuued by European Commision for Standardization of Iron and Steel (ECISS) and appropriate Technical Committees. CENELEC (Comité Européen de Normalisation Élec- trotechnique) – issues electrotechnic standards ETSI (European Telecomunications Standards Insti- tute) – issues telecommunication standards National committee for standardization They issue national standards. Connecting to European Union enlarging are European standards (EN) implemented into the national standard systems (technical standard harmonization). Unlike ISO standards are EN implemented without modification and hereby all discordant national standards have to be can- celled. Connected with this the philosophy of standard use has essentially changed: in the past was performance of standard regulations obligatory. At present appear two terms: relevance and obligation of standard. The standard is valid but, except some clauses, its observance is not compulsory. Standard gives recom- mend technical terms, wich need not be applied. On the other hand two factors arise: •if the standard is specific in the contract between seller and buyer, it will become a part of contract and all its demands have to be executed •in the case some damage occures in consequence of failure of harmonized standard claims, he who failed terms, defined by gowernment act, bear liability. That’s because by law if national standard system assumes harmonized EN, it will be- come also harmonized. After publishing in Official publica- tion of national standards standard may be used for advise- ment of technical terms execution. Another standards Here belong mainly company standards. These can not be con- trary to national standards. Further class are the standards of craft companies, e.g. in USA (AISI, ASTM, ASME, API, SAE). Valid bilateral technical terms or specifications can be shut-down between commercial partners. Technical standards are a part of legislation valid in appropriate industrial field. Specific connection of particular regulations is shown in the capters of individual tube range. Steel tubes – classification and terminologyMentioned terms of steel tubes are in standard EN 10079 or others (ISO 6929). Tube classification goes out several aspects: mode of produc- tion, cross section shape, tube ends treatment, sphere of tube usage. According to EN 10079 tubes rank among so-called long prod- ucts. It is a product having permanent circular or another hollow section along, with both ends free and with relatively long length. By mode of production are tubes divided to two big groups – seamless and welded. Each of this groups can be sectional- ized by method of tube production – hot or cold production. A part of tube products are also so-called hollow sections .Here belong seamless or welded tubes of circular, square or rectangular section, used as part of building steel constructions or machine units. Hollow bars are seamless tubes of circular section designed for production of machine parts by machining. Different from the two first tube groups hollow bars have qualitative and di- mensional parameters, which fit to requirements of workability, heat treatment or surface quality. Tubes in this guide book are ordered by application consider- ing mode of production, similar to ordering in new steel tube EN. Technical standards of steel tubes Technical characteristics of steel tubes are detailed in the appro- priate technical standards. Pipe parameters could be divided into three main groups: •dimensions and their tolerances (depending upon the tube manufacturing method) •steel grade and steel conditions •technical delivery conditions Individual national bureaus of standards use different procedures for data standardization of steel pipes. In real life three options are used: •each main group of parameters is contained in a single stan- dard. The standards are interconnected using references to the related ones. Dimensional standard contains dimensional tables and their tolerances; steel standard contains its chemical compo- sition and mechanical properties for various methods of pipe manufacturing and steel tempers. The third standard of the tech- nical delivery conditions (TDC) sets out all remaining require- ments for pipes – testing, acceptance, certificates, packaging, marking, etc. At the same time it contains references to other standards where these activities are described (e.g. STN •the second option is when steel and its characteristics are included into the TDC standard, and this one contains dimen- sional tolerances. Two standards are used to describe a pipe – dimensional standard that contains dimensional table and the TDC standard (e.g. DIN). •the third option – pipe parameters are in a single standard, which also contains the dimensional table, or extraction from the general table of dimensions constituting which is the con- tent of the general dimensional standard (e.g. NFA, EN). In real life there are cases, where both the seller and the buyer make bilateral TDC contracts, or they deliver pipes in accor- dance with the buyer’s specifications, which can also include the references to national standards. Normally, this is the case, where the demands for pipes are higher then those set-up in the national standards.
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4Production programm – products classification by application *Upon agreement also tubes (sections) with non-rounded cross section **Special offer upon agreement: Seamless or welded tubes for heat exchangers: carbon-, low alloy-, ferritic- and austenitic alloy steels the possibility of deliveries of long tubesU – bending and finning capabilitiesContinuously cast steel blooms Page 13 Seamless steel tubes for building and mechanical and general usePage 14 Steel tubes for building (hollow structural sections) Page 14 Tubes for mechanical and general engineering Page 16 Tubes for machining Page 16 Tubes for machine parts and general use*Page 16 Precision tubes and HPL tubes (seamless and welded)Page 60 – 93Seamless steel tubes for pressure equipmentsPage 22Tubes with specified room temperature properties Page 22 Tubes with specified elevated temperature properties Page 34 Alloy fine grain steel tubes for pressure equipmentsPage 42Tubes with specified low temperature properties Page 44 Tubes for heat exchangers**Page 48Tubes with internal rifflingPage 53Pipes suitable for welding and threadingPage 54Line pipePage 56Casing and tubing (upon agreement)Page 58
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5Precision cold drawn seamless steel tubes Page 60 Standard precision tubes Page 60 Cylinder tubes (for mechanical treatment – HPZ) Page 72 Cylinder tubes (HP – „ready to use“) Page 74 Tubes for hydraulic and pneumatic lines – HPL Page 76 Tubes for automotive industry Page 84 Injections tubes (for Diesel engines)Page 84Bearings tubesPage 85 Precision welded steel tubes Page 86 Cold sized precision welded tubes Page 86 Cold drawn precision welded tubes Page 88 Cold sized precision welded square and rectangular tubesPage 91Precision welded tubes for automotive industryPage 91Precision welded tubes for hydraulic and pneumatic linesPage 91Precision welded tubes for heat exchanger Page 48 Tube semiproducts Page 92 Buttwelding steel pipe fittingsPage 94Submerged arc longitudinal welded steel tubes and pipesPage 102Summary of technical delivery conditions for groups of tubes according to purpose of application see page 124.
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6Production flow chart in Železiarne Podbrezová Steel production Hot finished tubes production Division of bloomsElectric arc furnaceLadle furnaceContinuously casting Rotary heat furnaceSizing millRemoval of scale Piercing pressElongating millPush benchWithdrawal mill Ends cuttingReheating furnaceStretch reducing millColling bed CuttingStraighteningNondestructive ExaminationFinal lengths
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8SteelSpecific weightCoefficient Carbon7,85 kg.dm –31Austenitic stainless7,97 kg.dm –31,015 Ferritic and martensitic7,73 kg.dm –30,985Review of basic characteristics of steel tubes ElementMass rate in % 12Alaluminium0,30 Bboron0,0008 Bibismuth0,10 Cocobalt0,30 Crchrome0,300,50 Cucopper0,400,50 Lalantanides (each)0,10 Mnmanganese1,651,80 Momolybdenum0,080,10 Nbniobium0,060,08 Ninickel0,300,50 Pblead0,40 Seselenium0,10 Sisilicium0,60 Tetellurium0,10 Tititanium0,050,12 Vvanadium0,100,12 Wwolfram0,30 Zrzircon0,050,12 Other elements (except: carbon, phosphorus, sulphur, nitrogen), (each) 0,10 The following formula is used for calculation of reference weight (mass): M = (D – T) × T × 0,0246615 (kg/m), or x10,69 [in(lb/ft)]. Formula is applicable for carbon steel. For other steel the value is multiplied by the following coefficient: Steels for tubes Steel definition and division according to EN 10020 – steel is defined like: •material with iron mass rate upper then rate of any other ele- ments•content of carbon (C) is less than 2%, what is current limit between steel and cast iron (except some Cr-steel with al- lowed content of carbon more than 2%) •steel contains also more elements, shown in following table: Limit value of elements for non alloyed and alloyed steel – col- umn Nr.1 Weldable fine grain structural alloyed steel. Limit value of chem- ical composition of qualitative and high-grade steel – column Nr. 2 The basic characteristics classification is detailed in the previ- ous section. In this chapter there is a general description of these characteristics with the aim to serve as basis for description of individual particular types and groups of steel tubes. They are: •tube sizes •steel for tubes –steel classifications and definitions –steel marking system for tubes according to EN •technical delivery conditions (TDC) of tubes (excludes testing) •tube testing –test types –types of document control –individual tests Tube dimensions The tube dimensions belong among the basic characteristics of tubes. For industry needs and general use, tubes are manufac- tured in diameters ranging from tenths of milimeters to those hav- ing diameter of a few meters. It is mandatory that the tube sizes be set out in such a way that they define the tube complet ely from this point of view. In the tubes with circular cross section, there are, except for the length, three main dimensions: outside diameter, inside diameter and wall thickness. In circular tubes two v alues out of those mentioned are given. According to tube t ypes we can also assign to dimensions the appropriate dimensional tolerances. Dimensions of individual tubes are not created by chance, butthey are arranged into the dimensional sequels under the specific system. The tube sizes are in mm; in the USA and some other countries they use inches (“Zoll” in German). In this case tubes are also classified into two groups – “Tubes” are those used in mechanical applications and in energy facilities, while inches are used for the actual outside diameter. “Pipes” are those used in pipelines for different matters. Pipe size is denoted as the nominal pipe size, and up to 12 inches the denotation is given as an ap- proximate value (clearance) of the inside pipe diameter (more details can be found in the particular pipe types). After converting the pipe dimensions to milimetres used in the SI system there is a first and preferred sequel of outside diameters of steel pipes created (the first series in EN 10220, DIN 2448, etc.). However, this doesn’t mean that the pipes within Series 2 and 3 are not used at all. The sizes in Series 2 and 3 (for use in Europe, and supplemented by rounded off dimensions in mm) constitute the standards for Tubes, used in energy facilities design, and in tubes int ended for mechanical usage.Sequel of pipe wall thicknesses has its origin in the inch Unit sys- tem, where in order to express a size uses fractions. The series “Schedule” forms pipe wall thickness (40, 60, 80, 120, etc.), and in some dimensions is interconnected with the mass class (STD, XS, XXS). These values, converted to milimeters, form a part of pipe wall thickness series. (Note: size – value Schedule, e.g. 40, is not constant, bud dependant upon the outside diameter of a pipe). In the Tube category the wall thickness values are de- rived either from “scales” BWG, SWG, or other ones. After con- version to milimetres, these values become a part of sequel in steel tube w all thicknesses.For precision tubes used in Europe and in countries using SI units are established the dimensional series with rounded off measures of outside diameters and wall thicknesses. ElementIndex Cr, Co, Mn, Ni, Si, W4 Al, Be, Cu, Mo, Nb, Pb, Ta, Ti, V, Zr10 Ce, N, P, S100 B1000 Note – Alloy steel: 1. Steel is also given in EN. 2. Cast analysis is valid. 3. Minimum element content – see table. 4. In the case when maximum element content is given, 70% of that value (except Mn) is used for qualification. Index of defining of alloying elements content characteristic number
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9Steel quality groups accord- ing to chemical composition NON-ALLOY STEELS Element contents beyond the tabulated values STAINLESS STEELS Max. contents C 1,2% Min. contents Cr 10,5% Ni contents less than 2,5% or Ni contents over 2,5% OTHER ALLOY STEELS Non stainless steel, contents of, at least, a single element within the tabulated values. Classification of steel within the main quality groups Classification of steels according to EN 10020NON-ALLOY QUALITY STEELS For general requirements: – impact energy – grain size – formability ALLOY QUALITY STEELS fine-grain steels steels for rails and reinforcing steels for demanding use alloy steels by Cu steels for electronics NON-ALLOY SPECIAL STEELS Designed for quenching and tempering and surface hardening etc. Minimal val- ue of impact energy guaranteed. Low con- tents of non-metallic inclusions. BASIC CHARACTERISTICSCorrosion resisting steelsCreep resisting steels Heat resisting steelsALLOY SPECIAL STEELS structural steels for pressure vessels for anti-friction bearings tool steels high-speed steels special physical characteristics ++Designation system for steels according to EN EN 10027 – 1Steel names(ISO/TS 4949) Abbreviated designation systemPrincipal symbolsEN ECISS IC10 Additional symbolsEN 10027 – 2 Numerical system According to EN 10027 – 1 the steel names divide into the two main groups: •Group 1 – steel designated according to the usage and me- chanical properties •Group 2 – steel designated according to the chemical com- position. These further divide into the four subgroups. Group 1 S–structural steel (for general usage) P–steel fo r pressure equipmentsL–steel for pipelines E–steel for machine parts (the subsequent number stands for the minimum yield value in v N/mm 2)B–concrete reinforcing steel Y–prestressed concrete reinforcing steel R–steel for rails H–high strenght steel for cold rolled flat products D–sheet products from mild steel for cold forming – cold rolled T–thin sheets and strips for packingM–sheets and strips for electronic industry The first four steel kinds are used for tubes. Group 2 – includes 4 subgroups •non-alloy carbon steel (with controlled C content) – desig- nation: Letter C and the number corresponding to the centupli- cate of the average range specified for carbon content (C22)•Non-alloy carbon steel containing Mn > 1% and al-loyed steel with the contents of individual alloying elementsless then 5% – designation:a) number corresponding to the carbon contents centuplicate b) chemical symbols of alloying elements arranged accord-ing to the descending content of elements c) numbers set out following the alloying elements content. Mean element content, multiplied by index from table and approximated tu higher number (25CrMo4).•alloy steel with alloying addition content (a minimum of ver 5%) – designation: a) characteristic letter X (X11CrMo9-1) b) number – centuplicate of the mean carbon content c) chemical symbols of alloying elements d) numbers set out following the alloying elements content. Mean element content approximated tu higher number. •high-speed steel – designationa) characteristic letters HS (HS 6-5-2)b) numbers set out following the alloying elements content Regulation EN ECISS IC10 sets out additiional symbols forsteel (Group 1 and 2). These symbols form the suffixes to the steel mark end (e.g. S 275 J0). The supplementary sym- bols for steel products are detailed in Table 1, 2 and 3, and plus (+) must separate them from the preceding sym- bols – e.g. S 275 J0+A. Symbols for steel tubes G–other characteristics (according to the need 1 to 2 digits) H–hollow profile or steel for higher temperatures according to steel type (S, P) L–steel for low temperatures R–steel for room temperatures (ambient temperature) M–thermo mechanically rolled N–normalized annealing or normalized rolled Q–quenched T–steel for tubes EN 10027 – 2 includes the numerical system. The first digit is 1 – steel, followed by two digit of the steel and the steel se- quence number (1.0402, 1.7218, 1.7386, 1.3339) .• Classification of steels see also ISO 4948-1 and ISO 4948-2
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10Technical delivery conditions (TDC) of tubes (excludes inspection) All tubes requirements are concentrated in the TDC Standards. Specific data are included in standards for several groups of tubes General TDC for steel production are EN 10021 (ISO 404). Symbols and definitions of terms for use in product standards are in EN 10266. Important part is the tube testing. Tube inspectionTube testing proves that properties of tubes meet the require- ments of an order and appropriate standards. The process divide up into three parts: • setting out the test type (EN 10021, EN 10204, ISO 10474) • setting out the type of a document inspection (EN 10204) • selection of individual tests (particularly TDC) The individual parts are connected without possibility of any com- bination. Proper tests of particular tubes are speciefied in TDC. •Non-specific and specific inspection Non-specific inspection –contains only mandatory tests according to the particular standard –test specimens do not have to be from their own delivery –testing station does not have to be independent from the tubes treatment plant Specific inspection –except for mandatory tests it contains other free selected tests –tube specimens are from the delivery, and their number is set by standard –testing station must be independent from the pipe treatment plant•Tests –mandatory – as per individual TDC standards –optional – agreed upon while placing an order for the tubes chosen from standard •Quality – TR 1, TR 2 depends on:–chemical composition (Al contents) –mechanical properties value (bending impact test) –type of tubes testing (specific and non-specific testing) •Test category – TC1 and TC2 depends on:–establishing of a standard –chemical composition (carbon or alloyed steel) –possibility of choice in placing an order for pipes (in C steel) The categories differ from each other mainly by the require- ment for non-destructive testing of pipes, or selection of alter- native tests.•Types of inspection documents The summary of certificate types meets the requirements of EN 10204 in accordance with the type of inspection: Non-specific inspection 2.1Certificate of compliance with the order (manufacturer) 2.2Test Report (manufacturer) Specific testing 2.3Specific Test Report (manufacturer) – manufacturer’s test certificate, test results based on specific testing. This isonly issued if the manufacturer has no independent test- ing station. If the testing station is independent, in lieu of this certificate a Certificat e 3.1.B has to be issued. 3.1.AInspection Certificate 3.1.A (office inspector) 3.1.BInspection Certificate 3.1.B (works inspector) 3.1.CInspection Certificate 3.1.C (purchase inspector) 3.2Inspection Report 3.2 (works and purchase inspector) EN 10204: 2004 Issue customizes following test certificates: 2.1Declaration of compliance with the order 2.2Test report 2.3Not considered 3.1Inspection certificate 3.1 (former 3.1.B) 3.2Inspection certificate 3.2 (former 3.1.A, 3.1.C, 3.2) In EN is the table – Relation between class qualification ac- cording to Regulation 97/23 EU, supplement I., section 4.3 and type of certificate. The tests are divide into groups: •value of steel chemical composition – cast – product •dimensional inspection •mechanical properties*- tensile test- (hardness) – impact test •technological tests*- flattening – drift expanding – flanging – bending- ring tensile test •leak tightness test – hydrostatic test – non-destructive testing •non-destructive testing – longitudinal defects (eddy currents, leakage fluxes,- transverse defects ultrasonic)- laminar defects •other tests (metallography, corrosion resistance, etc.) * see page 110 Table below lists the overview of the leak tightness test and non-destructive testing: MethodSTN, DIN (SEP)EN ASTMDimensionsISO Tightness testHydrostatic pressure42 0415.8Normy TDPD < 140 mm NDT01 5047SEP 192510 246 - 1NDT 930201 5049 01 5054 Non-destructive tests (NDT)Eddy currents01 5054(PRP 02-74)10 246 - 3E 309D > 4 mm, T > 0,5 mm 9304Leakage fluxes01 5047SEP 191310 246 – 5E 570D > 32 mm, T > 2 mm**9402 Ultrasonic – L longitudinal imperf.01 5028 – 2SEP 191510 246 – 7E 213D > 13 mm, T > 1(2) mm** 9303Ultrasonic – Q transverse imperf.01 5028 – 3SEP 191810 246 – 6 9305Ultrasonic – D laminar imperf.01 5028 – 4SEP 191910 246 – 14 Tube lengths – see List of standards given for each of tube groups 1)** Values for Podbrezová 2) SEP 1917 – Eddy currents testing for electric-resistance welded tubing
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11EN 10216 – 1EN 10216 – 2, 3, 4 Quality TR1 or TR2Test category TC1 or TC2 C- steel, sort of quality is included in steel nameC- steel – option TC1 or TC2 Alloy steel – TC2 only 1. Leak tightness test Mandatory test for all tubes. Option from methods: 1.1 Hydrostatic test Hydrostatic test shall be carried out at a test pressure of 70 bar or a test pressure P calculated using the following equation , whichever is lower: P = 20x (SxT)/D, where S = stress in MPa, corresponding to 70% of minimum yield strength. 1.2 NDT (electromagnetic test) according to EN 10246 – 1 (E) Option from methods: 1.2.1 encircling coil – diameter of drilled hole in reference standard may be specific as percentage of wall thickness or diame ter of tube1.2.2 rotary probe coil – reference standard with depth of the notch of 12,5% of nominal wall thickness T (min. 0,5 mm, max 1,5 mm).Width of notch is smaller as depth, length min. 50 mm. 2. Non-destructive testing – longitudinal imperfections 2.1 Quality TR2 – optional test2.2 Test category TC2 – mandatory test – option from methods:- option from methods: 2.1.1 EN 10246-3 (electromagnetic)2.2.1 EN 10246-7 (ultrasonic) Level U2, sub-category C 2.1.2 EN 10246-5 (flux leak tightness)2.2.2 EN 10246-5 (flux leak tightness) Level F2 2.1.3 EN 10246-7 (ultrasonic) Level 3, sub-category C 2.3 transverse imperfections (EN 10246-6, U2C) and 2.4 laminar imperfections (EN 10246-14, U2) 2.5 measurement of WT (EN 10246-13) – only as optional test upon agreement. Leak tightness test and NDT of tubes for pressure purposes according to EN The pressure tubes of category TC2 are usually tested with combination of two NDT:- electromagnetic (eddy current) test (leak t ightnes)- ultrasonic test (NDT) Testing methods E –Eddy Current (EN 10246-1 and 3). (Test 1.2 and 2.1.1 in the table above.) For tubes with D 4 mm.Encircling coil – level of admitance E1H, E2H, E3H, E4H (diameter of drilled hole in reference standard may be specific as ter D – see table in standard) Rotary probe coil – level of admitance E2, E3, E4, E5 F –Flux Leakage (EN 10246-5). (Testing 2.1.2 and 2.2.2 in the table above.) For tubes with D 10 mm. Level of admitance F2, F3, F4, F5, F6 U –Ultrasonic – longitudinal imperfections EN 10246-7 – transverse imperfections EN 10246-6 – laminar imperfections EN 10246-14 (WT over 5 mm) – measurement of WT (EN 10246-13) (WT over 4,5–5 mm) (Tests 2.1.3, 2.2.1, 2.3, 2.4 and 2.5 in the table above). For tubes with D 10 mm and rate D/T > 5. For smaller rate agreement. Level of admitance of EN 10246-7 – U1, U2, U3, U4, U5, U6 Semilevel A, B, C, D Test level and depth of gauge notch in % of wall thickness: 13 25 310 412,5 515 620 Note EN 10216-1 – only C-steel is included in standard Subcategory – minimum depth of notch (mm) A0,1 B0,2 C0,3 D0,5 Subcategories A, B, C, D are applied for cold formed and machined tubes. Subcategories C and D are applied for hot rolled tubes.Other values of levels of admitance as in EN – upon agreement. Transverse, laminar testing and measurement of WT imperfections – upon agreement only. Testing according to ASTM A – see page 39
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