IS 5986 (2011): Hot Rolled Steel Flat Products for ...

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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 5986 (2011): Hot Rolled Steel Flat Products forStructural forming and Flanging Purposes [MTD 4: WroughtSteel Products ]IS 5986 : 2011 Hkkjrh; ekud ySat dk;Z ,oa lajpuk gsrq rIr csfYyrbLikr osQ ySV mRikn fof'kf"V(rhljk iqujh{ )Indian StandardHOT Rolled Steel FLAT Products FORSTRUCTURAL forming AND FLANGING PURPOSES SPECIFICATION( Third Revision )ICS BIS 2011 September 2011 Price Group 4B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARGNEW DELHI 110002 Wrought Steel Products Sectional Committee, MTD 4 FOREWORDThis Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalizedby Wrought Steel Products Sectional Committee had been approved by the Metallurgical Engineering standard was first published in 1970 and subsequently revised in 1992 and 2002.}

3 While reviewing thestandard, in the light of experience gained during these years, the Committee decided to revise it to bring inline with that present practices being followed by the Indian industry. In this revision the following changeshave been made:a)Number of grades have been increased to ) Grades have been aligned with the requirements given in the corresponding international standard,ISO 20805 : 2005 Hot Rolled Steel sheet in coils of higher yield strength with improved formability andheavy thickness for cold forming .c)International grades designation system based on yield stress has been ) Clause on retest has been all the tests specified in this standard (chemical/physical/others), the method as specified in relevant ISOS tandard may also be followed as an alternate the formulation of this standard, assistance has been derived from ISO composition of the Committee responsible for the formulation of this standard is given in Annex 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 withIS 2 : 1960 Rules for rounding off numerical values (revised).

4 The number of significant places retained inthe rounded off value should be the same as that of the specified value in this standard. IS 5986 : 20111 Indian StandardHOT Rolled Steel FLAT Products FORSTRUCTURAL forming AND FLANGING PURPOSES SPECIFICATION( Third Revision )1 SCOPEThis standard covers the requirements of hot rolledflat Products of non-alloy Steel intended for use inwelded, bolted and riveted structures. This standardalso covers the requirement of flanging and formingapplications required for the manufacture of integralcoaches, automobiles and general purpose use whereguaranteed mechanical properties and suitability forflanging and forming simple cold pressed parts REFERENCESThe following standards contain provisions, whichthrough reference in this text constitute provisionsof this standard.

5 At the time of publication, theeditions indicated were valid. All standards aresubject to revision and parties to agreements basedon this standard are encouraged to investigate thepossibility of applying the most recent editions ofthe standards indicated below:IS (in variousMethods of chemical analysis of parts)steels1599 : 1985 Method for bend test (secondrevision)1608 : 2005 Metallic materials Tensiletesting at ambient temperature(thirdrevision)1730 : 1989 Dimensions for Steel plates,sheets strips and flats for generalengineering purposes (secondrevision)1757 : 1988 Method for charpy impact test (V-notch) for metallic material(second revision)1852 : 1985 Rolling and cutting tolerances forhot Rolled Steel product (fourthrevision)1956 Glossary of terms relating to ironand Steel : (Part 3).

6 1975 Hot Rolled Steel Products (excluding sheet and strip) (firstrevision) (Part 4) : 1975 Steel sheet and strip (firstrevision)8910 : 2010 General technical deliveryrequirements for steels and steelproducts (first revision)3 TERMINOLOGYFor the purpose of this standard the definitionsgiven in IS 1956 (Parts 3 and 4) shall SUPPLY OF MATERIALSG eneral requirements relating to the supply ofmaterial shall conform to IS shall be manufactured by any process ofsteel making except Bessemer process. It may befollowed by secondary refining or secondaryvacuum, shall be semi-killed or GRADET here shall be nine grades of hot Rolled Steel plates,sheets, strips and flats designated as 165, 205, 235,255, 325, 355, 420, 490 and CHEMICAL Ladle AnalysisThe ladle analysis of the Steel , when carried out bythe method specified in the relevant parts of IS 228or any other established instrumental/chemicalmethod, shall conform to the requirements as givenin Table 1.

7 This analysis shall be made from a testsample, preferably taken during casting/teeming ofthe heat. In case of dispute, the procedure given inIS 228 and its relevant parts shall be the refereemethod and where test methods are not specifiedshall be as agreed to between the purchaser and Product AnalysisThe permissible variation in the case of productIS IS 5986 : 20112analysis from the limits specified in Table 1 shall beas given in Table 2 Permissible Variation for Product AnalysisSl , Percent, MaxCarbonManganesePhosphorusSulphur CarbonEquivalent1)(1)(2)(3)(4)(5)(6)(7)i ) ii) iii) iv) ) ) ) ) ) ) ) ) ) 1 Chemical Composition(Clauses and )NOTES1 The nitrogen content of the Steel shall not be more than percent. For aluminium killed or aluminium silicon killedthe nitrogen content shall not exceed percent.

8 This shall be ensured by occasional When the Steel is killed by aluminium the total aluminium content should not be less than percent. When Steel issilicon killed the silicon content shall not be less than percent. When the Steel is aluminium silicon killed the siliconcontent shall not be less than percent and total aluminium content shall not be less than The material may be supplied in the copper bearing quality in which case the copper shall be between and on The Steel can be made with micro-alloying element like Nb, V, Ti and B either individually or in combination on mutualagreement. In which case the total micro-alloying elements should not exceed percent in ladle analysis.

9 However, incase of boron, the limit shall be As the form of sulphide inclusions may have certain influence on the cold forming properties, Steel may be treatedwith elements like Ce or Ca, if agreed to between the manufacturer and )Carbon equivalent (CE) based on ladle analysis = MnCr + Mo + VNi + CuC +++65 152)For each reduction of below the specified maximum percent carbon, an increase of percent manganese overthe specified maximum up to is Variation Over the SpecifiedMaximum Limit, Percent, Max(1)(2) (3)i) ) ) ) ) FREEDOM FROM , strips, plates and flats shall be closelyrolled to the dimensions specified. The finishedmaterial shall be free from harmful defects and shallbe reasonable smooth and flat.

10 Repair by weldingshall not be undertaken by the supplier without thepermission of the the material is supplied in the form of coils,the degree or amount of surface defects are expectedto be more than in cut length sheets since theinspection of coils does not afford the sameopportunity to reject portion continuing defects aswith cut lengths. However, an excessive amount ofdefects may be cause for case of plates, scale pits and other minorsurface defects may be removed by grinding thedepth of grinding being such that the thickness ofthe plate shall not go below the specified value, atthe spot where dressing is done. The grinding shallbe even and smooth and shall be widened enough toremove sharp ridges. Dressing with a hammer orwelding of defective spots shall not be TENSILE tensile test shall be made from finished steelfor every 100 tonne or part thereof rolledcontinuously from each cast.