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1、BRITISH STANDARD BS 6744:2001 Stainless steel bars for the reinforcement of and use in concrete Requirements and test methods ICS 77.140.15, 91.080.40 ? +A2:2009 BS 6744:2001+A2:2009 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published un
2、der the authority of the Standards Committee and comes into effect on 15 September 2001 First published December 1986 Second edition August 2001 The following BSI references relate to the work on this British Standard: Committee reference ISE/9/1 Draft for comment 00/709560 DC Committees responsible
3、 for this British Standard The preparation of this British Standard was entrusted by Technical Committee ISE/9, Steel for concrete reinforcement, to Subcommittee ISE/9/1, Bars, wire and fabric for concrete reinforcement, upon which the following bodies were represented: British Cement Association Br
4、itish Coatings Federation Ltd. British Precast Concrete Federation Ltd. Concrete Society Department of the Environment, Transport and the Regions Highways Agency Electricity Association Institution of Structural Engineers UK Certification Authority for Reinforcing Steels UK Steel Association Amendme
5、nts issued since publication Amd. No.DateComments 157603 October 2005See Table 5 AMD 2See foreword BSI 2009 ISBN 978 0 580 59382 6 31 March 2009 w w w . b z f x w . c o m i Contents Page Forewordii 1Scope1 2Normative references1 3Terms, definitions and symbols1 4Designation5 5Standard sizes5 6Dimens
6、ions, mass and tolerances5 7Steelmaking process6 8Chemical composition6 9Surface quality8 10Surface geometry8 11Conditions of supply9 12Mechanical and physical properties9 13Retests10 14Product identification10 Annex A (normative) Determination of the effective cross-sectional area and mass per metr
7、e run of ribbed bars11 Annex B (informative) Guidance on grade selection to prevent corrosion12 Annex C (normative) Measurement of the geometrical characteristics12 Annex D (normative) Inspection and testing17 Annex E (normative) Bend test18 Annex F (normative) Method of test for fatigue properties
8、of ribbed bars18 Annex G (informative) Comparison of similar specifications19 Annex H (informative) Guidance on magnetic properties19 Annex I (informative) Third party certification19 Annex J (informative) Guidance on coefficients of thermal expansion22 Bibliography23 Figure 1 0.2 % proof test3 Figu
9、re C.1 Example of bar showing rib geometry15 Figure C.2 Rib flank inclination !, and rib height a (Section A.A from Figure C.1) 16 Figure C.3 Determining the area of the longitudinal section of a rib16 Table 1 Symbols4 Table 2 Standard sizes5 Table 3 Nominal cross-sectional area and nominal mass per
10、 metre run6 Table 4 Tolerances on mass per metre run6 Table 5 Stainless steel bar chemical composition (cast analysis) % by mass7 Table 6 Minimum relative rib area, fR8 Table 7 Tensile properties9 Table B.1 Guidance on the use of stainless steel reinforcement for different service conditions12 Table
11、 E.1 Bend test formers18 Table F.1 Fatigue test stress ranges 18 Table G.1 Comparison between the designation systems used in current and former British Standards and American steel specifications19 Table I.1 Acceptability index, k, as a function of the number of test results, n, for a reliable fail
12、ure rate of 5 % (pass = 0.95) at a probability of 90 % (1 - ! = 0.90)20 Table J.1 Comparative thermal coefficient of expansion data22 BS 6744:2001+A2:2009 BSI 2009 w w w . b z f x w . c o m ii Foreword This British Standard has been prepared by Technical Subcommittee, ISE/9/1. The start and finish o
13、f text introduced or altered by Amendment No. 1 and No. 2 is indicated in the text by tags !“ and . Informative annexes have been used to give guidance on grade selection, magnetic properties, coefficients of thermal expansion and third party certification. As far as is possible, the revision has be
14、en written to reflect the requirements of BS 4449, Specification for carbon steel bars for the reinforcement of concrete. Annex A, Annex C, Annex D, Annex E and Annex F are normative. Annex B, Annex G, Annex H, Annex I and Annex J are informative. Compliance with a British Standard cannot confer imm
15、unity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 23 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. BS 6744:2001+A2:2009 #$ BS 6744:2001+A2:2009 s
16、upersedes BS 6744:2001+A1:2005 which is withdrawn. contract. Users are responsible for its correct application. This revision contains new grades and strength levels not in the 1986 revision. #Attention is drawn to the fact that compliance with this document may involve the use of patents applied to
17、 steel grade 1.4162. The patent holder agrees to make the material available for production of stainless steel reinforcing bars on reasonable and accessible and non-discriminatory terms. Information on grade 1.4162 may be obtained from: Outokumpu Stainless Ltd, Europa Link, Sheffield, South Yorkshir
18、e S9 1TZ.$ BSI 2009 This publication does not purport to include all the necessary provisions of a NOTE It is anticipated that this standard will be reviewed in 2009. w w w . b z f x w . c o m 1 1 Scope This British Standard specifies requirements and describes methods of test for solid stainless st
19、eel bars used for the reinforcement of, and use in, concrete. It covers plain round steel bars in grade 200 and ribbed and plain steel bars in grades 500 and 650. This Standard applies to bars in which the ribs have been formed by the cold working or hot rolling processes. This Standard also applies
20、 to plain bars. Stainless steel bars produced from material whose metallurgical history is not known and fully documented are excluded from this standard. 2 Normative references The following normative documents contain provisions which, through references in this text, constitute provisions of this
21、 British Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS 8666, Specification for scheduling, dimensioning, bending and cutting of steel reinforceme
22、nt for concrete. BS EN 10002 (all parts), Tensile testing of metallic materials. BS EN 10021, General technical delivery requirements for steel and iron products. BS EN 10045-1, Charpy impact test on metallic materials Part 1: Test method (V- and U-notches). BS EN 10088-1, Stainless steels Part 1: L
23、ist of stainless steels. BS EN 10088-3, Stainless steels Part 3: Technical delivery conditions for semi-finished products, bars, rods and sections for general purposes. BS EN 10221, Specification for surface quality classes for hot-rolled bars and rods Technical delivery conditions. BS EN ISO 3651-2
24、, Determination of resistance to intergranular corrosion of stainless steels Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels Corrosion test in media containing sulfuric acid. ISO 10606, Steel for the reinforcement of concrete Determination of percentage total elongatio
25、n at maximum force. 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this British Standard the terms, definitions and symbols given in BS EN 10088-1 and the following apply. 3.1.1 bar product of plain round or ribbed cross-section 3.1.2 cold worked ribbed bar ribbed bar
26、 that has been cold worked to meet the property and geometrical requirements of this British Standard 3.1.3 hot rolled ribbed bar ribbed bar that has been hot worked to meet the property and geometrical requirements of this British Standard BS 6744:2001+A2:2009 BSI 2009 w w w . b z f x w . c o m 2 3
27、.1.4 nominal diameter, d diameter of a circle with an area equal to the effective cross-sectional area of the bar NOTE See clauses 5 and 6. 3.1.5 coil continuous as-rolled bar in the form of a coil 3.1.6 length piece of nominally straight bar cut to a specified length 3.1.7 bundle two or more coils
28、or a number of lengths properly bound together 3.1.8 batch any quantity of bars of one size, from one cast and grade, whether in coils or bundles, produced by one manufacturer or supplier, presented for examination at any one time 3.1.9 longitudinal rib uniform continuous protrusion parallel to the
29、axis of the bar 3.1.10 transverse rib any rib on the surface of the bar other than a longitudinal rib 3.1.11 rib height, a distance from the highest point of the rib (transverse or longitudinal) to the surface of the core (see Figure C.2) 3.1.12 rib spacing, c distance between the centres of two con
30、secutive transverse ribs, measured parallel to the axis of the bar (see Figure C.1) 3.1.13 relative rib area, fR area of the projections of all ribs on a plane perpendicular to the longitudinal axis of the wire, or bar, or rod, divided by the wire length and the nominal circumference 3.1.14 transver
31、se rib inclination, “ “ angle between the axis of the transverse rib and the longitudinal axis of the bar (see Figure C.3) 3.1.15 transverse rib flank inclination, ! ! angle between the rib flank and the longitudinal axis of the bar (see Figure C.2) 3.1.16 cast (heat) analysis chemical analysis repr
32、esentative of the cast (heat) determined by the steelmaker at his discretion in a manner of his choice BS 6744:2001+A2:2009 BSI 2009 w w w . b z f x w . c o m 3 3.1.17 product analysis chemical analysis carried out on a sample of the product 3.1.18 manufacturer organization that produces reinforcing
33、 steel, including steelmakers, re-rollers and cold workers 3.1.19 supplier organization supplying reinforcing steel to an end user NOTE The product may be supplied in straight lengths or fabricated in accordance with BS 8666. 3.1.20 purchaser organization that purchases the product for use in reinfo
34、rced concrete production 3.1.21 0.2 % proof strength, Rp0.2 stress at which a non-proportional extension is equal to 0.2 % of the extensometer gauge length (Le) (see Figure 1) 3.1.22 characteristic strength value of the proof stress, having a prescribed probability of not being attained in a hypothe
35、tical unlimited test series the characteristic value is the lower limit of the one-sided statistical tolerance interval at which there is a 90 % probability (i.e. 1-! = 0.90) 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
36、production Key A = Proof strength, non-proportional extension (Rp0.2 MPa) B = Specified percentage non-proportional extension (0.2 %) Figure 1 0.2% proof test A B 0Percentage elongation or Percentage extension Stress BS 6744:2001+A2:2009 BSI 2009 w w w . b z f x w . c o m 4 3.2 Table of symbols The
37、symbols used in this British Standard are described in Table 1. Table 1 Symbols SymbolUnitDescriptionClause(s) dmmNominal diameter of the bar3.1.4, 10.3.2, C.3.2, D.1.4, F.2 Rp0,2MPa0,2 % proof strength, non-proportional extension5.3 RmMPaTensile strength12.1, D.1.4, I.2.3, I.2.4 A5%Percentage elong
38、ation after fracture12.1, D.1.4, I.2.3, I.2.4 Agt%Percentage total elongation at maximum force12.1, D.1.4, I.2.3, I.2.4 cvCharacteristic value3.1.22, I.2.4 MmRkg/mMass per metre run of barA.1 MkgMass of bar sampleA.1, A.2 LmLength of bar sampleA.1, A.2 kg/dm3DensityA.1, A.2 MkgMass of bar sample aft
39、er removal of ribsA.2 mAverage of a population of resultsI.1.2, I.2.4 kAcceptability indexI.1.2, I.2.4 Standard deviation of a population of resultsI.1.2, I.2.4 Amm2Cross-sectional area of the barA.1 ammMaximum height of transverse rib3.1.11, 10.3.2, C.2.1 ammHeight of longitudinal ribC.2.2, C.3.2 a
40、!mmRib height at the quarter-pointC.3.3 ammmRib height at the mid-pointC.3.3 ammRib height at the three-quarters pointC.3.3 cmmTransverse rib spacing3.1.12, 10.3.2, C.2.3, C.3.2 PmmPitch for cold-twisted barsC.2.4 CfimmPart of the circumference without ribC.2.5 Angle between the axis of a transverse
41、 rib and the bar axis3.1.14, 10.3.2, C.2.6, C.3.2 !Transverse rib flank inclination3.1.15, 10.3.2, C.2.7 fRRelative rib area3.1.13, 10.2, C.3.1, C.3.2, C.3.3, C.3.4 FRmm2Area of the longitudinal section of one ribC.3.2 n, m, q, pIndices used in calculations of fR and FRC.3.2 Empirical factor in empi
42、rical formula for fRC.3.3 BS 6744:2001+A2:2009 BSI 2009 w w w . b z f x w . c o m 5 4 Designation 4.1 The steel designation numbers used in this standard shall be defined in accordance with BS EN 10088-1. 4.2 The products covered by this British Standard shall be designated in the following sequence
43、: a) the description of the product form (e.g. plain round or ribbed bar or coil); b) the number of this British Standard (BS 6744:2001); e) the strength grade (see Table 6). EXAMPLE In accordance with this British Standard, a ribbed bar with a nominal diameter of 20 mm, a nominal length of 12 000 m
44、m, steel designation number 1.4301, and strength grade 500: Ribbed bar BS 6744:2001-2012000-1.4301, 500. 5 Standard sizes The range of sizes of bars in all grades shall be from 3 mm to 50 mm. NOTE 1 The range of standard sizes is given in Table 2. Table 2 Standard sizes NOTE 2 Other sizes may be mad
45、e available on request. 6 Dimensions, mass and tolerances 6.1 Effective cross-sectional area and mass per metre run The effective cross-sectional area and mass per metre run of the bars shall be calculated using the method described in Annex A. The values for the nominal cross-sectional area and nom
46、inal mass per metre run of individual bars shall be as given in Table 3. The tolerances on mass per metre run shall be in accordance with Table 4. NOTE The values for the nominal mass per metre run are calculated from the values of the nominal cross-sectional area using GradeNominal sizes mm 200a3,
47、4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 25, 30, 35, 40, 50 5003, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 25, 32, 40, 50 6503, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 25 ,32,40,50 a Plain only BS 6744:2001+A2:2009 #$ density values in BS EN 10088-1. d) the BS EN 10088-1 steel designation number (see #Table 5$ c) th
48、e nominal dimensions of the product (see clause 5 and 6.2); ); BSI 2009 w w w . b z f x w . c o m 6 Table 3 Nominal cross-sectional area and nominal mass per metre run Table 4 Tolerances on mass per metre run 6.2 Length 6.2.1 The nominal length of bars shall be agreed at the time of enquiry and orde
49、r. NOTE 1 The preferred length is 6 m. NOTE 2 Bar lengths available are: k20 mm up to 12 m; 20 mm up to 9 m. 6.2.2 Unless otherwise agreed at the time of enquiry and order, the permissible deviation from the nominal length shall be mm. 7 Steelmaking process Unless a special steelmaking process is agreed when ordering, the steelmaking process for steels conforming to BS EN 10088 shall be at t