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IS 1786 (2008): High strength deformed steel bars and ...

Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. 1 + , 1 + 0 1 ' 5 . Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru The Right to Information, The Right to Live Step Out From the Old to the New.

In the third revision, IS 1139:1966 ‘Specification for hot rolled mild steel, medium tensile steel and high yield strength steel deformed bars for concrete reinforcement’ was merged in the standard and the title was modified to ‘Specification for high strength deformed steel bars and wires for concrete reinforcement’. The restriction to ...

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Transcription of IS 1786 (2008): High strength deformed steel bars and ...

1 Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. 1 + , 1 + 0 1 ' 5 . Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru The Right to Information, The Right to Live Step Out From the Old to the New.

2 IS 1786 (2008): High strength deformed steel bars and wires for concrete reinforcement- [CED 54: Concrete Reinforcement]. ! $ ' + - . Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge . ! > 0 B .. Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen . IS 1786:2008. i k, Indian Standard HIGH strength deformed . steel bars AND WIRES FOR. CONCRETEREINFORCEMENT . SPECIFICATION. (Fourth Revision ). I(X ; $'. @ BIS 2008. BUREAU OF INDIAN STANDARDS. MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG. NEW DELHI 110002. May 2008 Price Group 6. Concrete Reinforcement Sectional Committee, CED 54. FOREWORD. This Indian Standard (Fourth Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Concrete Reinforcement Sectional Committee had been approved by the Civil Engineering Division Council.)

3 The standard was first published in 1961 and subsequently revised in 1966, 1979 and 1985. In its second revision of 1979, the title of the standard was modified to Specification for cold-worked steel high strength deformed bars for concrete reinforcement'. In the third revision, IS 1139:1966 Specification for hot rolled mild steel , medium tensile steel and high yield strength steel deformed bars for concrete reinforcement' was merged in the standard and the title was modified to Specification for high strength deformed steel bars and wires for concrete reinforcement'. The restriction to cold working was removed in this revision and the manufacturers were allowed to resort to other routes to attain high strength . High strength deformed bars and wires for concrete reinforcement are being produced in the country for many years by cold twisting and by controlled cooling and micro-alloying.

4 A brief note on controlled cooling process is given in Annex A for information only. In the past few years there has been increasing demand for higher strength grades with higher elongation for various applications. This revision has been taken up to incorporate various changes found necessary as a result of experience gained and technological advances made in the field of steel bars and wires manufacturing, This revision incorporates the properties of high strength deformed steel bars and wires, and it is left to the manufacturer to adopt any process to satisfy the performance requirements. Following are some of the important modifications incorporated in this revision: a) A new strength grade Fe 600 has been introduced. b) Two categories based on elongation for each grade except Fe 600 have been introduced.

5 C) A new parameter percentage total elongation at maximum force' has been introduced. d) Nominal sizes have been rationalized and nominal sizes 7 rnnL 18 rnq 22 rnrQ 45 mm and 50 mm have been removed. In the formulation of this standard, due weightage has been given to international coordination among the standards and practices prevailing in different countries in addition to relating it to the practices in the field in this country. The following test methods given in this standard correspond to those given in 1S0 Standards: SI Title IS No. 1S0 No. NO, i) Mechanical testing of metals Tensile testing 1608 6892. ii) Methods for bend test 1599 7438 and 15630-1. iii) Method for re-bend test for metallic wires and bars 1786 15630-1. The composition of the Committee responsible for the formulation of this standard is given in Annex B.

6 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 NOVEMBER 2012. TO. IS 1786 : 2008 HIGH strength deformed bars AND WIRES. FOR CONCRETE REINFORCEMENT SPECIFICATION. (Fourth Revision). (Second cover page, Foreword) Insert the following after sixth para as a separate para: Provisions in this standard are at variance with similar provisions in ISO 6935-2 : 2007 steel for the reinforcement of concrete Part 2: Ribbed bars ', in view of the following: a) Geographical factors which determine the earthquake zoning and consequently the structural design considerations, structural design method/principles adopted, the design parameters and the required material properties.

7 B) Technological factors associated with the process of manufacture of the product (such as through secondary processes/induction furnace), which influence the product characteristics (like chemical composition and mechanical properties like yield strength , tensile strength , elongation, ductility, etc);. and c) Construction techniques and practices adopted in this country, the equipments used and the skill level of construction workers which also influence the product characteristics (such as bend and bond strength ). The major deviations are: a) The steel grades covered are at variance. This standard covers requirements for high strength bars only whereas ISO 6935-2 also covers bars of lower tensile strengths. b) Chemical compositions vary from that in ISO 6935-2. c) Mechanical properties specified in this standard are individual values, whereas the tensile properties in ISO 6935-2 are primarily the specified characteristic values.

8 D) Bend and re-bend test requirements vary from those in ISO 6935-2. e) Bond requirements in this standard are specified on basis of mean area of ribs whereas the requirements in ISO 6935-2 are for rib geometry. This standard additionally specifies pull out test as a requirement for approval of new or amended rib geometry.'. (Page 1, clause ) Substitute the following for the existing clause: This standard covers the requirements of deformed steel bars and wires for use as reinforcement in concrete, in the following strength grades: a) Fe 415, Fe 415D, Fe 415S;. b) Fe 500, Fe 500D, Fe 500S;. c) Fe 550, Fe 550D; and d) Fe 600. NOTES. 1 The figures following the symbol Fe indicate the specified minimum percent proof stress or yield stress, in N/mm2. 2 The letters D and S following the strength grade indicates the categories with same specified minimum percent proof stress/yield stress but with enhanced and additional requirements.

9 '. (Page 2, clause ) Substitute the following for the existing clause: The ladle analysis of steel for various grades, when carried out by the method specified in the relevant parts of IS 228 or any other established instrumental/chemical method, shall have maximum permissible percentage of constituents as follows. In case of dispute, the procedure given in IS 228 and its relevant parts Price Group 2. 1. Amend No. 1 to IS 1786 : 2008. shall be the referee method and where test methods are not specified shall be as agreed to between the purchaser and the manufacturer/supplier. Constituent Percent, Maximum Fe 415 Fe 415D Fe 415S Fe 500 Fe 500D Fe 500S Fe 550 Fe 550D Fe 600. Carbon Sulphur Phosphorus Sulphur and phosphorus NOTES. 1 For guaranteed weldability, the Carbon Equivalent, CE using the formula: CE C.

10 Mn . Cr Mo V .. Ni Cu . 6 5 15. shall not be more than percent, when micro-alloy/low alloys are used. When micro-alloys/low alloys are not used, carbon equivalent using the formula: Mn CE C . 6. shall not be more than percent. Reinforcement bars /wires with carbon equivalent above percent should, however be welded with precaution. Use of low hydrogen basic coated electrodes with matching strength bars /wires is recommended. 2 Addition of micro-alloying elements is not mandatory for any of the above grades. When strengthening elements like Nb, V, B and Ti are used individually or in combination, the total contents shall not exceed percent; in such case manufacturer shall supply the purchaser or his authorized representative a certificate stating that the total contents of the strengthening elements in the steel do not exceed the specified limit.


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