BUREAU OF INDIAN STANDARDS ( CENTRAL MARKS …

1 BUREAU OF INDIAN STANDARDS ( CENTRAL MARKS DEPARTMENT-III ) Our Ref: CMD-III/16:Sectoral Manual. 26-04-2007 Subject: Preparation of Sectoral manuals. for rolled Steel Products (Sheets) (IS 277, 513, 648, 1029, 1079, 1993, 2002, , 10748). Sectoral Manuals for rolled Steel Products (Sheets)(IS 277, 513, 648, 1029, 1079, 1993, 2002, 10748) has been prepared (Copy enclosed). Vide CMD note Ref:CMD-I/3:10 dated 12/12/2006 Sectoral manual is circulated to all ROs/BOs and also pasted on BIS intranet for comments ,however no comments have yet been received by CMD-III, Since MDM-II, MDK-I and Jamshedpur is operating maximum no.

2 Of licences for rolled Steel Products (Sheets) therefore are requested to kindly examine the manual and send comments to CMD-III within 15 days latest by 10th of May so that CMD-III may take further necessary action to finalize the manual. This may be taken on Top Priority. Nawal Kishore Sc B (CMD-III) Sc F & Head (CMD-III) MDM-II,MDK-I Cc to all ROs/BOs- Sectoral manual was put on the intranet but no comments received so far. ROs /BOs operating licences for these products may request concerned officer to go through the manual and send their comments within 15 Days. 2 DRAFT Doc Date of Manual for Certification of Hot and Cold rolled Steel Flat Products (Black and Coated) to ( IS 277:2003, IS 513:1994, IS 648:1994, IS 1029:1970, IS 1079:1994, IS 1993:1993/ ISO 1111-1:1983, IS 2002:1992, IS 10748:2004) (First Issue) B U R E A U O F I N D I A N S T A N D A R D S MA N A K B H A V A N 9 B.

3 S. Z A F A R M A R G NEW DELHI 110001 Contents Section Page 3 Title 1 Foreword and Scope 3 Product Description Section I 4 Specifications Section - II 9 Manufacturing Process & Control Section - III 11 Inspection and Testing Section - IV -1 18 Test Methods

4 Section - IV II 23 Test Equipment Section - IV-III 25 Certification Criteria Section V 28 Other Important Aspects Section VI 34 Annexure - I Steel Making 36 Annexure - II Steel Refining 37 Annexure - III Casting 38 Annexure - IV Hot rolling & 39 Cold rolling Annexure - V Metal Coating 40 Annexure - VI Sample Size 41 Annexure - VII Do 42 Annexure - VII Grouping of 43 Sections Annexure - IX Do 44 Appendix - A Design Aspects And sample selections Appendix - B Manufacturing processes Appendix C Solidifications Mechanism and steel defects Appendix D Tree diagram for stop marking Appendix - E ISI Monogram for Standard mark Appendix - F & G STI for IS 277 and part of STI to IS 1029 FOREWORD Use of steel as an engineering material needs no introduction.

5 Since long wrought steel is produced and subsequently processed through mechanical working in various grades and in basically two 4forms viz. long and flat products and are subjected to further manufacturing processes for use in construction, manufacturing machinery, transportation and other engineering hardware, components, domestic appliances etc. Flat products viz. strip, sheet and plate have their unique uses in important manufacturing sectors like in automobiles, railways, shipping, pressure vessels including boilers, pipes for conveying fluids, domestic appliances like that of manufacturing white goods, security & storage items, in construction like those in roofing, in packaging where tinplate plays important role and there are many more areas where steel flat products are put to use. In fact, of late there is continuous rise in the production and demand of quality flat products globally and specially in our country, recently, due to advent of automobile industry and rise in existing road, Railways, water transportation system including shipping, rise in demand of pressure vessels, widening construction sector, to meet the requirements of the relevant industries/sectors.

6 Over last three decades BIS has been catering to this requirement by introducing quality certification MARKS scheme as per various INDIAN STANDARDS formulated; in private & public sector steel plants both in primary and secondary units. In between there has been significant rise in secondary steel sector and the trend is towards further rise in this area. More over overseas industries have been granted licenses & this process is likely to rise because of import of sheets & strips for developing automobile sector and rise in global trade. This manual is aimed at providing a consolidated account of production process, quality control aspects of certification criteria which will bring uniformity in approach towards granting of licenses and supervision on the operation thereof. Scope: The present manual covers the flat steel products in Hot rolled , (HR) Cold rolled (CR) and coated conditions to various standard specifications viz.

7 IS 277, 513, 648, 1029, 1079, 1993, 2002 and 10748. The products are in various forms viz. as strips in coils, sheets in straight lengths, plates either in coils or in straight lengths and galvanized sheets (IS 277) which are also in supply as plain or corrugated sheets. These flat products are produced in large quantities under BIS Quality Certification MARKS Scheme to respective specifications at various primary steel plants, secondary steel units by re-rollers and industries processing for coated products. This manual shall serve to provide an out line of the steel technology involved in production process and quality control aspects thereof which are expected to assist in objective assessment on operational issues. Further the basics dealt with on certification criteria shall guide in the procedures of supervision over the operation of the licenses.

8 These may also help in effective interaction with plant personnel and as such shall bring uniformity in certification practices all over the country as are carried out by various Branch and Inspection Offices. In doing so it provides product descriptions, their respective specifications, manufacturing processes, process control/quality assurance system and practice and special requirements of the products, if any. Specifications referred to be their latest version as are existing now, it is expected that there may be changes in some of the aspects on the revision of STANDARDS as and when they take place. Though the manual shall have references to various STIs to the different products addressed in this manual it shall not be replacing them. It is intended for the internal use of BIS inspecting officers. SECTION I Product Description Present manual is meant for steel flat products which comprise of strip, sheet and plate.

9 These products are identified by their width to be many times higher than of their thickness in sharp contrast to long products where the sections are square or rectangular having ratio of width to thickness as small. Long products can also be of round cross section. It will be worth while to provide standard definitions of each of them. There are specified maximum thickness to 5distinguish strip from sheet and minimum specified thickness of the section to distinguish plate from sheet. One aspect, however, stands well defined in strip that it is always supplied in coils & sheets in straight lengths. Strips below 5mm thickness if cut in to straight lengths shall be called sheets where as the strips of 5mm thickness and above if cut in to straight lengths shall be called plates. Sheets and plates can be produced in straight lengths and supplied as such.

10 The definition of each of the flat products as provided in IS 1956 (Part 3 & 4) are as under. a) Strip A hot or cold rolled flat product and rolled approximately in rectangular cross section of thickness usually 12 mm and below with mill rolled or trimmed or sheared edges and in coil form. Wide strip Hot/cold rolled strip of width normally equal or greater than 600 mm. Narrow strip Hot/Cold rolled strip of width normally less than 600 mm. Sheet A hot or cold rolled flat product rolled in rectangular section of thickness below 5 mm and supplied in straight lengths. The width is at least 100 times the thickness and edges can be mill finished, trimmed, sheared or flame cut. A sheet can also be obtained by cutting strips. Plate A hot or cold rolled flat product, rolled from an ingot or slab, in rectangular cross section of thickness 5 mm and above and width 600 mm and above and supplied in straight lengths.