SVENSK STANDARD SS :2013

Transkript

1 SVENSK STANDARD SS :2013 Fastställd/Approved: Publicerad/Published: Utgåva/Edition: 1 Språk/Language: engelska/english ICS: ; ; ; ; Spännarmering Allmänna krav Prestressing steels General requirements

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3 Denna standard ersätter: This standard supersedes the Swedish Standard: Edition SS SS SS SS SS SS Copyright/Upphovsrätten till denna produkt tillhör SIS, Swedish Standards Institute, Stockholm, Sverige. Användningen av denna produkt regleras av slutanvändarlicensen som återfinns i denna produkt, se standardens sista sidor. Copyright SIS, Swedish Standards Institute, Stockholm, Sweden. All rights reserved. The use of this product is governed by the end-user licence for this product. You will find the licence in the end of this document. Upplysningar om sakinnehållet i standarden lämnas av SIS, Swedish Standards Institute, telefon Standarder kan beställas hos SIS Förlag AB som även lämnar allmänna upplysningar om svensk och utländsk standard. Information about the content of the standard is available from the Swedish Standards Institute (SIS), telephone Standards may be ordered from SIS Förlag AB, who can also provide general information about Swedish and foreign standards. Standarden är framtagen av kommittén för Armering, SIS/TK 145. Har du synpunkter på innehållet i den här standarden, vill du delta i ett kommande revideringsarbete eller vara med och ta fram andra standarder inom området? Gå in på - där hittar du mer information.

4 Contents Introduction Scope Normative references Terms and definitions Symbols Classification and designation Classification Designation Information to be obtained by the manufacturer Requirements General Standard properties Special properties Evaluation of conformity General Initial inspection and initial type testing Factory production control Continuous surveillance Evaluation, reporting and action Test methods Delivery conditions Identification Delivery information Dimensions of product Packaging and handling Transport and storage Annex A (normative) Product families Annex B (normative) Additional/alternative test procedures B.1 Fatigue testing Annex C (informative) Clauses of this Standard addressing product certification C.1 Scope and relevant characteristics C.2 Procedure for product certification of prestressing steel Bibliography Page 2

5 Introduction SS , SS , SS and SS are based on pren part 1 to 4 dated The amendments in SS compared to pren are small. Except for a number of editorial changes the following may be noted: changes are made in 8.1, 8.2, 10.1 and 10.2; changes are made in Annex C (Annex C is based on Annex ZA in pren 10138); the frequency of audit testing is changed; class C2 and test solution B is omitted; stress ratio according to pren dated is used instead of force ratio and values have been changed accordingly. Where Eurocode 2 (SS-EN ) [1] gives assumptions of material properties, these are normally appropriate for designs using the materials in this standard. Where more accurate information is required the determined values in this standard may be used. This standard specifies minimum measured values whilst Eurocode 2 uses characteristic values. 3

6 1 Scope This standard SS , specifies general requirements for uncoated high tensile strength steel products, which are widely used for the prestressing of concrete and are also used for other tensile applications in the construction field. The standard applies only to products as supplied by the manufacturer. This Swedish standard together with SS , SS and SS specify the requirements of the technical classes for wire, strands and bars for a range of product families as given in Table A.1. This specification also covers uncoated high tensile strength steel products (wire, strand, bar as defined in 3.3 to 3.5) of other nominal diameters or higher technical (strength) classes whose requirements are not specified in this standard provided that: for a given product family (product type, nominal tensile strength, dimensional range), either the new nominal diameters do not deviate by more than 2,5 mm for wire and strands and 10 mm for bars from the dimensional range defined in Table A.1 or the higher technical class does not deviate by more than 100 MPa from the existing nominal tensile strength as stated in Table A.1 with no extension of the dimensional range; the manufacturing process and general properties meet the requirements in 7.1; the specified standard and special properties are as defined in 7.2 and 7.3; the evaluation of conformity is carried out according to Clause 8. NOTE 1 Extension of both nominal diameter and nominal tensile strength is not permitted for a given product family. NOTE 2 Products according to this standard are products with confirmed properties according to BFS 2008:8 and VVFS 2004:31 including amendments only when product certified. Product certification of prestressing steels is covered in Annex C. 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. SS , Prestressing steels Wire SS , Prestressing steels Strand SS , Prestressing steels Bar SS-EN 10020, Definition and classification of grades of steel SS-EN 10204, Metallic products Types of inspection documents SS-EN ISO Metallic materials Charpy pendulum impact test Part 1: Test method (ISO 148-1:2009) SS-EN ISO 377, Steel and steel products Location and preparation of samples and test pieces for mechanical testing (ISO 377:1997) SS-EN ISO , Steel for the reinforcement and prestressing of concrete Test methods Part 3: Prestressing steels (ISO :2009) SS-EN ISO , Non-alloy steel wire rod for conversion to wire Part 1: General requirements (ISO :2011) 4

7 SS-EN ISO , Non-alloy steel wire rod for conversion to wire Part 2: Specific requirements for generalpurpose wire rod (ISO :2011) SS-EN ISO , Non-alloy steel wire rod for conversion to wire Part 4: Specific requirements for wire rod for special applications (ISO :2011) 3 Terms and definitions For the purposes of this document, the terms and definitions given in SS , SS , SS and the following apply. 3.1 bar product manufactured in straight lengths in a hot rolling mill NOTE It may be plain or have ribs or threads. 3.2 characteristic value value having a prescribed probability of not being attained in a hypothetical unlimited test series NOTE In the context of this standard the characteristic value is (unless otherwise indicated) the lower limit of the statistical tolerance interval at which there is a 95 % probability (1 - α = 0,95) that 95 % (p = 0,95) of the values are at or above this lower limit. This definition refers to the long-term quality level of production. 3.3 consignment (delivery batch) total amount of the product in the same delivery to a purchaser, which may consist of products coming from several units of manufacture 3.4 factory production control permanent internal production control exercised by the manufacturer 3.5 heat quantity of steel corresponding to the same casting operation identified by a single number designated by the steel manufacturer 3.6 inspection conformity evaluation by observation and judgement accompanied as appropriate by measurement, testing or gauging 3.7 maximum value value which no test result shall exceed 3.8 median average value of the third and fourth test result from the ordered series of results of a corrosion test on six test pieces 3.9 minimum value value below which no test result shall fall 5

8 3.10 processed bar bar treated after production by accelerated cooling (including quenching), cold stretching or additional tempering, either singly or in combination NOTE It may be plain or have ribs or threads product family group of products of the same type and same technical class (strength class) NOTE 1 Their surface configuration may vary e.g. plain or indented. NOTE 2 See Annex A for product families covered by SS , SS , SS product type specific delivery form of prestressing steel NOTE See Table A special properties properties prescribed in this standard that are not determined as part of the factory production control requirements for every unit of inspection 3.14 standard properties properties prescribed in this standard as part of the factory production control requirements for every unit of inspection 3.15 strand product consisting of a number of cold drawn wires spun together in the same direction and with the same lay length that is given a final thermo-mechanical treatment NOTE 1 The strand is then wound into large diameter coils (see ). NOTE 2 The common types of strands are as follows: a) 2-wire strand: Two wires spun together over a theoretical common axis; b) 3-wire strand: Three wires spun together over a theoretical common axis; c) 7-wire strand: A straight core wire around which are spun six wires in one layer; d) 7-wire compacted strand: 7-wire strand that has been drawn through a die, or compressed by other means, before the final thermo-mechanical treatment; e) Indented 3-wire strand or 7-wire strand: Strand produced from indented wires. The central wire of 7-wire strand may be plain with no indentations testing laboratory laboratory carrying out the various tests required to evaluate the products NOTE The testing laboratory may be located at the manufacturer's production area, located on the manufacturer's site or located remote to the manufacturer's site independent to the manufacturer. 6

9 3.17 threshold level quantitative expression of the behaviour of a construction product, for an action to which it is subject or which it generates under the intended use conditions 3.18 threshold value quantitative expression of the limiting value of a construction product, for an action to which it is subject or which it generates under the intended use conditions 3.19 unit of inspection quantity of product coming from a unit of manufacture and presented at any one time for examination and release purposes NOTE The physical limits on unit of inspection depends on each product type, see unit of manufacture quantity of product of the same nominal diameter, surface configuration and technical class (strength class) that is manufactured according to the same specified manufacturing conditions NOTE The physical limits on unit of manufacture depends on each product type, see unit of product quantity of product coming from a subdivision of a unit of manufacture, generally in the form as delivered to a purchaser NOTE The physical limits on unit of product depend on each product type, see wire product manufactured by cold working of wire rod that is in a suitable metallurgical condition for cold working and which is given a final thermo-mechanical treatment NOTE The surface of the wire is plain or indented. It may be covered by a residue of drawing lubricant. The wire is wound into large diameter coils (see ) or delivered in bundles of cut lengths wire rod hot rolled steel delivered in coils, used for cold working treatment such as wire drawing 7

10 4 Symbols The symbols used in this standard and the corresponding designations are given in Table 1. Table 1 Symbols and corresponding designations Symbol Unit Designation α Statistically reliable failure rate d mm Nominal diameter of the product S n mm 2 Nominal cross-sectional area of the product M g/m Nominal mass per metre of the product F m kn Specified characteristic value of maximum force F m, max kn Specified maximum value of maximum force F p0,1 kn Specified characteristic value of 0,1 % proof force A gt % Specified minimum value of percentage total elongation at maximum force F ma kn Actual maximum force, in the tensile test, determined on a test piece adjacent to the test piece submitted to special property test F up kn Upper force in the axial force fatigue test F r N Force range in the axial force fatigue test F Hz Frequency of force cycles in the axial force fatigue test D % Maximum permitted value of the average percentage reduction of the maximum force in the deflected tensile test m r kn Average value of the test results for maximum force or 0,1 % proof force K Coefficient function of the number of test results N Number of test results for maximum force or 0,1 % proof force S kn Estimated standard deviation of the test results for maximum force or 0,1 % proof force C v kn Specified characteristic value for maximum force or 0,1 % proof force M g Mass of the test piece R m MPa Nominal tensile strength d sw mm Nominal diameter of a constitutive wire of a strand D i mm Minimum internal diameter of a coil of wire or strand E GPa Modulus of elasticity 8

11 5 Classification and designation 5.1 Classification All steels covered by SS , SS , SS and SS are classified as special steels according to SS-EN Designation The products covered by this Swedish Standard shall be designated as given in SS , SS and SS Information to be obtained by the manufacturer The following information shall be obtained by the manufacturer at the time of enquiry and order: a) designation of the product in accordance with SS , SS or SS ; b) packaging and protection requirements and in the case of products supplied in bundles the maximum mass of the individual bundle; c) requirements concerning information to accompany the delivery exceeding 10.2 (e.g. test values and copies of force/extension diagrams from all coils or bundles, typical relaxation values); d) special requirements for labelling exceeding 10.1; e) nominal depth of indentations for indented wire. 7 Requirements 7.1 General Steelmaking processes The steel may be made by any process except that air or mixed air-oxygen bottom blown processes shall not be used Primary incoming materials The primary products (billets or wire rod) shall be manufactured according to and associated processes, which will ensure products fully conforming to requirements. The wire rod shall conform to SS-EN ISO and SS-EN ISO or SS-EN ISO and SS-EN ISO Freedom from defects The finished product shall be free from any defects likely to impair its performance. Products with rusted steel shall not be supplied unless the rust is a thin film. The underlying steel surface shall appear to be smooth to the unaided eye. Bars may be covered by a layer of scale Welds Wire and bar shall not contain welds in the product, as supplied by the manufacturer. Strand with normal production lengths may contain welds made in the individual wires before cold drawing, but shall not contain any welds made during or after cold drawing. 9