IS 4923 (1997): Hollow steel sections for structural use ...

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2 > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 4923 (1997): Hollow steel sections for structural use -Specification [MTD 19: steel Tubes, Pipes abd Fittings]IS 4923 : 1997 *m d&i $Fm & Ekz tiwlIwb !T+T&H--rn (FTm~) Indian Standard HOLLOWSTEELSECTIONSFOR STRUCTURALUSE-SPECIFICATION ( Second Revision ICS OBIS 1997 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 September 1997 Price Group 3 J steel Tubes, Pipes and Fittings Sectional Committee, MTD 19 FOREWORD This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the steel Tubes, Pipes and Fittings Sectional Committee had been approved by the Metallurgical Engineering Division Council. This standard was first published in 1968 and was revised in 1985. In view of the recent developments in the use of Hollow steel sections for structural use, the committee decided to revise this standard incorporating the following main modifications : a) Table 1 has been modified to cover sizes of square Hollow sections presently being used.

3 B) Table 2 has been modified to cover sizes of rectangular Hollow sections presently being used in the country. c) References have been updated. d) Various clauses have been aligned with the present practice being followed. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding off numerical values (revised) . The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. AMENDMENT NO. 1 DECEMBER 1998 TO IS 4923 : 1997 Hollow steel sections FOR structural USE - SPECIFICATION ( Sectnd Revision) (Page 2, Fig. 1) - Substitute the folIowing figure. for the existing figure: Mu = Maximum permitted outside axncr mdius in mm. v = TotaJ measured hvist in milJJmetrcs.

4 FIG. 1 MEASUREMENTOF TWISTOF SQUAW AND RECTANGULAR sections (MlD19) Reprography Unit, BIS, New Delhi, India :1997 HOLLOWSTEELSECTIONSFORSTRUCTURALUSE SPECIFICATION(SecondReviswn)(Page5,Table 1) Insettthefollowingattheend:Table1 DimensionandPropertiesofSquareHollowSect ionsr_ Ll&gnationl. E ..;180x180x4180x180x5180X180X<180xli30x[ (MTD19)( )Depth lMcknessweightAreaMomentRadioaElasticPla sticofWIC%DofofModulusModuhaSeetionInert iaGyrationmmmmkglmcm2cm4cmcm3cm3(2)(3)(4 )(5)(6)(7)(8)(9) . ~ - ,..1,,.. ,B[ ,ln& :1997 HOLLOWSTEELSECTIONSFORSTRUCTURALUSE SPECIFICATION(SecondRevision)(Page2,clau se9,Title) Substitute STRAIGHTNESS,TWISTANDCONCAVITY/CONVEXITY & STRAIGHTNESSANDTWIST (Page2, ) : :xi_xloo.~ ~ ~100B B H ,a= :1997(Page2, ,tabularmatter) Insertthefollowingattheend: aConcavity/convexity1percentofthesize I(Page3, ,tabularmatter) Insertthefollowingattheend: g)Concavity/convexity1percentofthesize l(MTD19)ReprographyUnit,BIS,NewDelhi,Ind ia 2008 TOIS 4923 : 1997 HOLLOWSTEELSECTIONSFORSTRUC1'lJRALUSE -SPECIFICATION(.]]

5 ;lon)[Puge5,Table1(see also )]-SubstitutelDesignation/Size'for'Desig nation'.(Page6,Table2) -Substitute'Designation/Size'for'Designa tion'.(M'I'I)19)Reprography Unit, BIS, AMENDMENT NO. 5 JUNE 2010 TO IS 4923 : 1997 Hollow steel sections FOR structural USE SPECIFICATION ( Second Revision ) (Page 2, clause , para 2) Delete. (Page 2, clause ) Substitute the following for the existing: Manufacturer name/Logo/Trade-mark shall be embossed on each Hollow section . Each Hollow section shall have size designation suitably marked on it. [Page 3, clause (c)(2)] Substitute 10 tonnes, Min for 10 tonnes . (MTD 19) Reprography Unit, BIS, New Delhi, India AMENDMENT NO. 6 JUNE 2011 TO IS 4923 : 1997 Hollow steel sections FOR structural USE SPECIFICATION ( Second Revision ) (Page 2, clause 10) Substitute the following for the existing: 10 COATING Hollow sections may be varnished, painted or oiled externally or may be galvanized as agreed between the purchaser and the manufacturer.

6 In case of galvanizing, the mass of zinc coating shall be as per the agreement between the manufacturer and purchaser. (MTD 19) Reprography Unit, BIS, New Delhi, India IS 4923 : 1997 Indian Standard Hollow steel sections FOR structural USE - SPECIFICATION 1 SCOPE 5 DESIGNATION This standard covers the requirements for hot and cold formed square and rectangular Hollow steel sections for structural use. 2 REFERENCES A Hollow section shall be designated by its outside dimensions and its thickness in millimetres and shall be further classified into CF or HF depending upon whether it is cold formed or hot formed . The following Indian Standards are necessary adjuncts to this standard: Examples: IS No. 228 Title Methods of chemical analysis of pig iron, cast iron and plain carbon and low alloy steels 1387 : 1993 General requirements for the supply of metallurgical materials (second revision) A hot formed square Hollow section with outside dimensions of 50 mm square and mm thickness is designated as 50 x 50 x HF SHS.

7 A cold formed square Hollow section with outside dimensions of 50 mm square and mm thickness is designated as 50 x 50 x CF SHS. 1608 : 1995 Mechanical testing of metals - Tensile testing (second revision) a) b) Cl 3 TERMINOLOGY A hot formed rectangular Hollow sectional with outside dimensions of 40 mm depth, 25 mm breadth and mm thickness is designated as 40 x 25 x HF RHS. For the purpose of this standard, the following definitions shall apply. Black section 6 MANUFACTURE section as manufactured, but without any subsequent surface treatment. Exact Length Specified length of a single section as mentioned by the purchaser. The Hollow sections shall be manufactured from steel made by any approved process which, shall show not more than percent of sulphur and not more than percent of phosphorus. NOTE- Ihe copper bearing steel may be used in manufac- turing the sections subject to mutual agreement between the manufacturer and the purchaser.

8 Copper content to range between to percent. Random Length Normal manufacturing lengths which may vary over a range of several metres. Alternatively, a length range agreed to between the manufacturer and the purchaser. section The analysis of steel shall be carried out either by the methods specified in IS 228 and its relevant parts or any other established instrumen- tal/chemical method. In case of dispute the procedure given in IS 228 and its relevant parts shall be the referee method. When used without qualification it refers to one length of square or rectangular Hollow section covered by this specification. section 1 GENERAL REQUIREMENTS 4 SUPPLY OF MATERIAL Tubes for forming into square and rectangular Hollow sections shall be manufactured by one of the following processes : a) Seamless, b) Hot finished welded, or c) Electric resistance or induction welded. 7 BASIS OF CALCULATION General requirements relating to the supply of steel Hollow sections shall conform to IS 1387.

9 For the purpose of the standard, the weights are calculated on the basis that steel weighs kg/cm* per metre run. For calculating cross- 1 IS 4923 : 1997 sectional area and weight per unit length, corner radii have taken into consideration (see Annex A). 8 DIMENSIONS AND WEIGHTS The standard sizes and weights of Hollow sections with other geometrical properties shall be as given in Tables 1 and 2 (see pages 5 and 6). Sizes ot her than those given in Tables 1 and 2 may be supplied by mutual agreement between the supplier and the purchaser. 9 STRAIGHTNESS AND TWIST The tubes shall be supplied either in finish straightened or mill straightened condition as agreed to between the purchaser and the manufacturer for which maximum deviation from straightness shall be as under. For tubes in finish straightened condition 1/6 OOth of length at the centre of the length. For tubes in mill straightened condition l/ZlOth of any length at the centre of the length.

10 Twist shall be measured for square and rectan- gular sections as given in Fig. 1. The tolerances on twist shall be 2 mm plus mm/m measured in accordance with the figure. t r ma = Maximum permitted outside comer radius in mm. V = Total measured twist in millimetres. FIG. 1 MEASUREMENT OF TWIST OF SQUARE AND RECTANGULAR sections 10 OILING AND PAINTING Hollow sections may be varnished painted or oiled externally, if so agreed between the purchaser and the supplier. 11 PACKING Where Hollow sections are to be bundled for transport, these shall, unless otherwise specified, be secured together by rope, soft wire or straps. If other packing is required, it shall be agreed to between the purchaser and the manufacturer. 12 MARKING Each Hollow section shall have the name of the manufacturer and size designation suitably marked on it. Alternatively, a label containing the particulars may be attached to a bundle of Hollow sections .