1、BS 7668:2016Weldable structural steels Hot finished structuralhollow sections in weatherresistant steels SpecificationBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Publishing and copyright informationThe BSI copyright notice displayed in this document indicates whe
2、n the documentwas last issued. The British Standards Institution 2016Published by BSI Standards Limited 2016ISBN 978 0 580 93521 3ICS 77.140.75The following BSI references relate to the work on this document:Committee reference ISE/103Draft for comment 16/30338305Publication historyFirst published,
3、June 1994Second edition, April 2004Third (present edition), September 2016Amendments issued since publicationDate Text affectedBS 7668:2016 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 24 Information and requirements to be agreed and documented 35 Class
4、ification and designation 46 Technical requirements 57 Inspection and testing 78 Samples 89 Test methods 1010 Marking 12AnnexesAnnex A (normative) Chemical composition and mechanical properties 13Annex B (normative) Location of samples and test pieces 15Bibliography 17List of figuresFigure B.1 Tensi
5、le test piece locations Items tested in full section 15Figure B.2 Location of tensile and impact test pieces Circular or ellipticalsection 15Figure B.3 Location of tensile and impact test pieces Square and rectangularsections 16List of tablesTable 1 Permissible limits on the product analysis from th
6、e ladle analysisspecified in Table A.1 4Table 2 Example of product with designated impact properties at 0 C 4Table 3 Inspection and test programme 8Table4Testunits 9Table A.1 Chemical composition (ladle analysis) 14Table A.2 Maximum carbon equivalent value (CEV) 15Table A.3 Mechanical properties 15S
7、ummary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 18, an inside back cover and a back cover.BRITISH STANDARD BS 7668:2016 The British Standards Institution 2016 iForewordPublishing informationThis British Standard is published by BSI Standards Limi
8、ted, under licence fromThe British Standards Institution, and came into effect on 30 September 2016. Itwas prepared by Technical Committee ISE/103, Structural steels other thanreinforcements. A list of organizations represented on this committee can beobtained on request to its secretary.Supersessio
9、nThis British Standard supersedes BS 7668:2004, which is withdrawn.Information about this documentThis standard applies to hot finished structural hollow sections with enhancedatmospheric corrosion resistance and includes grades that are not currentlycovered by BS EN 10210-1:2006 and BS EN 10210-2:2
10、006. The grades inBS 7668:2016 are compatible with those of similar strength level inBS EN 10025-5:2004.This is a full revision of the standard, and introduces the following principalchanges: inspection documentation requirements updated (4.2, 7.1 and 7.2); new grades introduced to ensure compatibil
11、ity with those of similarstrength level specified in BS EN 10025-5 and to reflect currently proposedfuture updates to BS EN 10210-1:2006; classification and designation updated to reflect the new grades; the use of open hearth steel prohibited where secondary steelmaking is notalso applied; impact t
12、esting now based on BS EN ISO 148-1 usinga2mmradius striker(6.5.3, 8.2.3.3 and 9.2.2); repair of the weld in SAW hollow sections permitted; welding procedures updated; test unit requirements revised; tensile testing now based on BS EN ISO 6892-1 (8.2.3.2 and 9.2.1); amendments made to specified NDT
13、requirements (9.4.2 and 9.4.3).It has been assumed in the preparation of this British Standard that theexecution of its provisions will be entrusted to appropriately qualified andexperienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are pres
14、ented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Requirements in this standard are dr
15、afted in accordance with Rules for thestructure and drafting of UK standards, subclause J.1.1, which states,“Requirements should be expressed using wording such as: When tested asdescribed in Annex A, the product shall .”. This means that only those productsthat are capable of passing the specified
16、test will be deemed to conform to thisstandard.BRITISH STANDARDBS 7668:2016ii The British Standards Institution 2016Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance
17、 with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 7668:2016 The British Standards Institution 2016 iiiBRITISH STANDARDBS 7668:2016This page deliberately left blankiv The British Standards Institution 20161 ScopeThis British Standard specifies the technical del
18、ivery requirements for weldableweather resistant hot finished seamless, electric welded and submerged arcwelded (longitudinal or helical) steel structural hollow sections of circular,square, rectangular or elliptical forms. It applies to hollow sections formed hotwith or without subsequent heat trea
19、tment, or formed cold with a subsequentfull body heat treatment to obtain equivalent metallurgical conditions to thoseobtained in a hot formed product.The products are equally suitable for welded, bolted and riveted structures. Thehollow sections specified in this British Standard are intended for u
20、se inconstruction or for general engineering purposes. Requirements for tolerances,dimensions and sectional properties are specified in BS EN 10210-2.NOTE Four material grades are specified in this standard and the user should selectthe grade appropriate to the intended use and service conditions.Th
21、is British Standard does not apply to products currently covered by,BS EN 10210-1, BS EN 10219-1, BS EN 10219-2 or BS EN 10225. However, thegrades in BS 7668:2016 are compatible with those of similar strength levelspecified in BS EN 10025-5.In addition to the definitive requirements, this standard a
22、lso requires the itemsdetailed in Clause 4 to be documented. For compliance with this standard, boththe definitive requirements and the documented items are to be satisfied.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispen
23、sable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS EN 287-1, Qualification test of welders Fusion welding Part 1: SteelsBS EN 1011-1, Welding Recommendations for we
24、lding of metallic materials Part 1: General guidance for arc weldingBS EN 1011-2, Welding Recommendations for welding of metallic materials Part 2: Arc welding of ferritic steelsBS EN 10021, General technical delivery requirements for steel productsBS EN 10027-1, Designation systems for steel Part 1
25、: Steel namesBS EN 10052, Vocabulary of heat treatment terms for ferrous productsBS EN 10079, Definition of steel productsBS EN 10168, Steel products Inspection documents List of information anddescriptionBS EN 10204, Metallic products Types of inspection documentsBS EN 10210-2, Hot finished structu
26、ral hollow sections of non-alloy and finegrain steels Part 2: Tolerances, dimensions and sectional propertiesBS EN ISO 148-1, Metallic materials Charpy pendulum impact test Part 1:Test methodBS EN ISO 377, Steel and steel products Location and preparation of samplesand test pieces for mechanical tes
27、tingBS EN ISO 2566-1, Steel Conversion of elongation values Part 1: Carbon andlow alloy steelsBRITISH STANDARD BS 7668:2016 The British Standards Institution 2016 1BS EN ISO 6892-1, Metallic materials Tensile testing Part 1: Method of testat room temperatureBS EN ISO 10893-2, Non-destructive testing
28、 of steel tubes Part 2: Automatededdy current testing of seamless and welded (except submerged arc-welded)steel tubes for the detection of imperfectionsBS EN ISO 10893-3, Non-destructive testing of steel tubes Part 3: Automatedfull peripheral flux leakage testing of seamless and welded (except subme
29、rgedarc-welded) ferromagnetic steel tubes for the detection of longitudinal and/ortransverse imperfectionsBS EN ISO 10893-6, Non-destructive testing of steel tubes Part 6: Radiographictesting of the weld seam of welded steel tubes for the detection ofimperfectionsBS EN ISO 10893-7, Non-destructive t
30、esting of steel tubes Part 7: Digitalradiographic testing of the weld seam of welded steel tubes for the detection ofimperfectionsBS EN ISO 10893-11, Non-destructive testing of steel tubes Part 11:Automated ultrasonic testing of weld seam of welded steel tubes for thedetection of longitudinal and/or
31、 transverse imperfectionsBS EN ISO 15607, Specification and qualification of welding procedures formetallic materials General rulesBS EN ISO 15609-1, Specification and qualification of welding procedures formetallic materials Welding procedure specification Part 1: Arc weldingBS EN ISO 15614-1, Spec
32、ification and qualification of welding procedures formetallic materials Welding procedure test Part 1: Arc and gas welding ofsteels and arc welding of nickel and nickel alloys3 Terms and definitionsFor the purposes of this British Standard, the terms and definitions given inBS EN 10021 (inspection a
33、nd testing), BS EN 10052 (heat treatment), BS EN 10079(hollow section), BS EN 10204 and BS EN 10168 (inspection documents), and thefollowing apply.3.1 hot finishedfinal forming process of the hollow section carried out at a temperature above700 C, or where the hollow section is cold formed and then
34、subsequently fullbody heat treated at a temperature above 580 CNOTE 1 Normalized and normalized formed hollow sections (+N) can be regardedas hot finished but hot finished hollow sections cannot be regarded as normalizedunless they are processed or full body heat treated in the normalizing temperatu
35、rerange.NOTE 2 Cold formed electric welded tubes supplied with heat treatment only ofthe weld seam are not in accordance with this standard as they cannot be classifiedas hot finished.3.2 test unitquantity of hollow sections from one or more cast(s) of the same grade anddimensions, manufactured by t
36、he same process in the same supply and, ifapplicable, heat treatment, condition, submitted for acceptance or verificationtesting at the same timeNOTE The hollow sections can be manufactured by electric welding, submerged arcwelding, etc.BRITISH STANDARDBS 7668:20162 The British Standards Institution
37、 20164 Information and requirements to be agreed anddocumented4.1 InformationThe following information to be supplied by the purchaser shall be fullydocumented. For compliance with the standard both the definite requirementsspecified throughout the standard and the following documented items shall b
38、esatisfied:a) the quantity (mass or total length);b) the range and type of length (see BS EN 10210-2);c) details of the product form:d) HFCHS (hot finished circular hollow sections);e) HFRHS (hot finished square or rectangular hollow sections);f) HFEHS (hot finished elliptical hollow sections);g) th
39、e designation (see Clause 5);h) the dimensions (see BS EN 10210-2);i) the options (see 4.3).4.2 RequirementsThe following items to be agreed between the contracting parties are specifiedin the clauses referred to and shall be fully documented.a) The conditions under which, and the extent to which, w
40、elding repair to thebody shall be carried out (see 6.7.5).b) If an inspection document 3.2 (in accordance with BS EN 10204) is specified,the purchaser shall notify the manufacturer of the address of theorganization or person nominated by the purchaser to carry out theinspection and produce the certi
41、ficate of conformity.NOTE See 7.2 for different types of inspection documents.4.3 OptionsThe optional requirements, which if required shall be specified and documentedat the time of the enquiry and/or order, are as follows.a) Product analysis shall be carried out in accordance with 6.4.1 and Table 1
42、.b) The Cr, Cu, Mo, Ni, Ti and V ladle analysis contents shall be reported in theinspection certificate in accordance with 6.4.1.c) A maximum carbon equivalent value (CEV) shall be provided (see 6.4.3).d) The body of the hollow section shall not be repaired by welding (see 6.7.5).In the absence of s
43、uch information, the manufacturer shall supply in accordancewith the basic specification.BRITISH STANDARD BS 7668:2016 The British Standards Institution 2016 3Table 1 Permissible limits on the product analysis from the ladle analysis specified in Table A.1Grade Permissible deviation of product analy
44、sis from ladle analysisCSiMnP S CrMoNiAlTOTCu Nb Ti V% by massS355J0WH+0.02 +0.05-0.05+0.10+0.005 +0.005 +0.10 +0.03 +0.05 -0.005 +0.07 +0.010 +0.02 +0.02S355J2WHS355K2WHS420K2WH5 Classification and designationFor the products covered by this British Standard, the steel names shall beallocated in ac
45、cordance with BS EN 10027-1.NOTE 1 Within the strength grades specified in Annex A, qualities J0, J2 and K2are specified. These differ in respect of specified impact test requirements (see TableA.3).NOTE 2 In accordance with the classification system in BS EN 10020, all of thesesteel grades are allo
46、y special steels.The product designation shall consist of the following: the number of this British Standard: BS 7668; the capital letter S for structural steel; the minimum specified yield strength in MPa for thicknesses: 16 mm; the characters J0 for the quality with specified impact properties at
47、0 C; the characters J2 or K2 for the qualities with specified impact properties at-20 C; the capital letters WH to indicate structural hollow sections of weatherresistant steel.NOTE 3 Table 2 illustrates how the product is designated with impact properties at0 C.Table 2 Example of product with desig
48、nated impact properties at 0 CBS 7668 S 355 J0 WHNumber of thisstandardStructural steelMinimum yieldstrength (MPa) forthickness 16 mmImpact properties,27 Joules at 0 CHollow section ofweather resistantsteelBRITISH STANDARDBS 7668:20164 The British Standards Institution 20166 Technical requirements6.
49、1 GeneralHollow sections shall conform to the requirements of Annex A.6.2 Delivery conditionThe products shall be delivered in either the hot finished or full bodynormalized condition.NOTE The steel manufacturing process is at the discretion of the steel producerwith the exception that the open hearth (Siemens-Martin) process can not beemployed unless in combination with a secondary steelmaking or ladle refiningprocess.6.3 Hollow section manufacturing proc
