भारतीय िानक IS 14650 : 2023

Indian Standard
(Superseding IS 2830 : 2012, IS 2831 :
2012, IS 8052 : 2006, IS 8951 : 2001 and
IS 8952 : 1995)

पनु र्वेल्लन के ललए लिलित और अलिलित इगं ट

और अर्ध-सिाप्त इस्पात की उत्पाद — लर्वलिलि
( पहला पुनरीक्षण )

Unalloyed and Alloyed Steel Ingot

and Semi-finished Products for
Re-Rolling Purposes — Specification
( First Revision )

ICS 77.140

 BIS 2023

भारतीय िानक ब्यरू ो

BUREAU OF INDIAN STANDARDS
िानक भर्वन, 9 बहादरु िाह ज़फर िागध, नई लदल्ली - 110002
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI - 110002
www.bis.gov.in www.standardsbis.in

September 2023 Price Group 5

Wrought Steel Products Sectional Committee, MTD 04

FOREWORD

This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the draft finalized
by the Wrought Steel Products Sectional Committee had been approved by the Metallurgical Engineering
Division Council.
This standard was first published in 1999. Previously, various standards co-existed for semi-finished steel for
a particular use as well as for any steel product irrespective of its use. On the request of manufacturing as well
as user industry, the committee examined the issue and decided to formulate a single standard for all
semi-finished steels which may be used for re-rolling into any steel product irrespective of its use.

In this revision, the requirements of unalloyed and alloyed steel ingots and semi-finished products for rolling
into different steel products conforming to various product standards are covered.

With this revision, Indian Standards pertaining to ingots/semi-finished products for a particular use and
covered under IS 2830 : 2012, IS 2831 : 2012, IS 8052 : 2006, IS 8951 : 2001 and IS 8952 : 1995 shall stand
withdrawn subsequently.

The composition of the Committee responsible for the formulation of this standard is given in Annex A.

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 : 2022 ‘Rules for rounding off numerical values (second revision)’. The number of significant places
retained in the rounded off value should be the same as that of the specified value in this standard.
 IS 14650 : 2023

Indian Standard
UNALLOYED AND ALLOYED STEEL INGOT AND
SEMI-FINISHED PRODUCTS FOR RE-ROLLING PURPOSES —
SPECIFICATION
( First Revision )

1 SCOPE IS No. Title

1.1 This standard covers the requirement of
unalloyed and alloyed steel ingots and IS 11371 : 2022 Method for macroetch testing,
semi-finished products for rolling into different inspection and rating of
products conforming to applicable Indian wrought steel products (first
Standard. Semi-finished products include revision)
continuously cast products and products generally IS 12037 : 1987 Specification for macrographic
obtained by forging or rolling ingots and intended examination of steel by sulphur
for transformation into different steel products. print (baumann method)

1.2 The requirements of this standard shall not be 3 TERMINOLOGY

applicable to carbon and alloyed steel ingots and
semi-finished products for forging. For the purpose of this standard, the following
definitions in addition to those given in IS 1956
1.3 The requirements of this standard shall not be
(Part 3) shall apply.
applicable to mild steel for metal arc welding
electrodes. 3.1 Ingot — Products obtained by pouring liquid
steel into moulds of a shape appropriate to the
2 REFERENCES
subsequent processing into semi-finished
The standards given below contain provisions products, or flat or long products, generally by hot
which through reference in this text, constitute rolling or forging.
provision of this standard. At the time of NOTES
publication, the editions indicated were valid. All
standards are subject to revision and parties to 1 The shape generally resembles a truncated pyramid or
truncated cone; the side surfaces may be corrugated and
agreements based on this standard are encouraged the corners more or less rounded. Depending on
to investigate the possibility of applying the most subsequent conversion requirements, ingots may be
recent edition of these standards: dressed and/or hot scarfed or cropped without altering
their status as ‘ingots’.
IS No. Title 2 According to the cross-section, a distinction is made
between the following:
IS 228 (all parts) Methods of chemical analysis a) Ingots, having a cross-section that may be
of steels square, rectangular (of width up to twice the
thickness), polygonal, round, oval or shaped
IS 1956 (Part 3) Glossary of terms relating to according to the profile to be rolled; and
: 2019 iron and steel: Part 3 Long b) Slab ingots, of rectangular cross-section of
products (including bars, rods, width twice the thickness or over.
sections and wires) (second
3.1.1 Cast Billet Ingots — For the purpose of this
revision)
standard, cast billet ingot shall be defined as ingot,
IS 4163 : 2021/ Steel — Determination of generally of cross-section not more than 200 mm
ISO 4967 : content of non-metallic square which can be rolled directly into merchant
2013 inclusions — Micrographic products. Cast billet ingot is also sometimes
method using standard known as ‘pencil ingot’.
diagrams (fourth revision)
3.2 Semi-finished Products — Continuously cast
IS 7598 : 1990 Classification of steels (first products and products generally obtained by
revision) forging or rolling ingots and intended for
IS 8910 : 2022/ Steel and steel products — transformation into finished products. The
ISO 404 : General technical delivery cross-section is generally square, rectangular with
2013 requirements (second revision) angles more or less rounded, the section has

1
IS 14650 : 2023

uniform dimension all along the length of the 4 SUPPLY OF MATERIAL

piece. The tolerances are generally wider than
those for finished products. The surfaces can be General requirements relating to the supply of
partially or totally conditioned by scarfing, steel shall conform to IS 8910.
chipping, grinding, planning or milling and
5 PRODUCT DESIGNATION
turning.
5.1 The product designation shall follow the
3.2.1 Semi-finished Products of Square Cross- sequence below:
Section — Semi-finished products with sides of
50 mm or over, generally described as blooms, if a) Number of this Indian Standard with
the sides are greater than 200 mm or as billets, if prefix IS;
smaller. b) Corresponding product standard (CPS);
c) Number of Indian Standard of the
NOTE — These dimensions may be less for certain types
of steel, for example high-speed steels.
corresponding hot-rolled product; and
d) Grade/designation of the hot-rolled steel
3.2.2 Semi-finished Products of Rectangular product as per (c) above.
Cross-Section — Semi-finished product of cross-
5.2 The designation of steel grade shall include a
sectional area of 2 500 mm2 or over of width up to
set of characters as follows:
twice the thickness, generally described as
blooms, if the cross-sectional area is greater than a) First character: To indicate this IS
40 000 mm2 or as billets, if smaller. number;
b) Second character CPS; and
3.2.2.1 Slab — A semi-finished product of c) Third &fourth characters: To represent
rectangular cross-section with a thickness of at corresponding hot-rolled product
least 50 mm and a width of at least twice the standard and grade/designation of the
thickness, described as a slab. hot-rolled product.
Examples:
3.2.2.2 Sheet bar (slab bars) — Semi-finished
products of rectangular section, of a thickness not 1) IS 14650 CPS 2062/E250 BR
less than 6 mm, width not less than 150 mm and 2) IS 14650 CPS 1786/Fe 500D
of such dimensions that the thickness does not
exceed one quarter of the width. This product also 5.2.1 Steel designated as per a product standard
includes the product tinplate bars. can be used to produce another grade of product
provided the chemical composition fulfills the
3.2.3 Round Semi-finished Products — requirement of that grade.
Continuously cast or forged semi-finished
products of circular cross-section. 6 MANUFACTURE

3.2.4 Blank for Sections — Semi-finished 6.1 The steel shall be manufactured by any
process of steel making at the discretion of the
products intended for the manufacture of specific
manufacturer. It may be followed by secondary
sections that have been pre-formed for that refining.
purpose.
6.2 Steel shall be supplied rimmed/semi-killed/
3.2.5 VAR Ingot — Semi-finished product, usually killed as per the product standard. For cases,
shaped as round ingots or blooms, obtained by where it is not mentioned in product standard, it
melting press-formed metallic raw material or by may be supplied as agreed to between the
remelting ingots or blooms using a vacuum arc purchaser and the supplier.
remelting (VAR) furnace.
6.3 Sufficient discard shall be given from each
NOTE — Vacuum arc remelting results in products with ingot to ensure freedom from pipe, segregation
improved chemical homogeneity and inclusion
cleanliness. and other harmful defects.
6.4 Removal of surface defects shall be permitted
3.2.6 ESR Ingot — Semi-finished product, usually provided that finish dimensions are not less than
shaped as round ingots or blooms, obtained by that specified and that the operation is not likely to
melting press-formed metallic raw material or by affect the end use of the product.
remelting ingots or blooms using an electro slag
remelting (ESR) furnace. 7 CHEMICAL COMPOSITION
NOTE — Use of electro slag remelting results in 7.1 The chemical composition of steel shall
products with improved chemical homogeneity and
inclusion cleanliness. conform to the ladle analysis requirements of the

2
 IS 14650 : 2023

relevant product standard under which the ingots each cast.

and semi-finished products have been ordered.
9 SELECTION OF TEST SAMPLE FOR
7.1.1 The ladle analysis of steel shall be CHECK ANALYSIS
carried either by the method specified in the
relevant parts of IS 228 or any other established 9.1 In the case of ingots, if required, the samples
instrumental/chemical method. In case of dispute, for product analysis shall be prepared by
the procedure given in the relevant part of IS 228 forging/rolling down to 30 mm round section.
shall be referee method. However, where the 9.1.1 Drilling shall be taken from the sample
method is not given in IS 228 or its relevant parts, representing two-third, one half and one-third of
the referee method shall be as agreed to between height from bottom of the ingot separately.
the purchaser and the manufacturer.
9.2 In case of billets, blooms and slabs, the sample
7.1.2 Elements not quoted in the relevant product
for check analysis shall be taken from the location
standard should not be intentionally added to the
as shown in Fig.1.
steel without the agreement of the purchaser,
except those intended for finishing the heat. 9.3 For other products, the location of sample
shall be as mutually agreed between the purchaser
7.1.3 In order to get the desired properties,
and the manufacturer.
restricted chemistry may be mutually agreed to
between the purchaser and the supplier. 10 DIMENSIONS
7.2 Check Analysis
10.1 The size and shapes shall be subject to
7.2.1 Check analysis shall be carried out on the mutual agreement between the purchaser and the
product from the standard position (see 9). manufacturer.
Permissible variations in the case of check
analysis from the limits of ladle analysis shall be 10.2 The length shall be subject to mutual
as specified in the relevant product standard. agreement between the purchaser and the
manufacturer.
7.2.2 Variation shall not be applicable both over
and under the specified limits in several 11 TOLERANCES
determinations in one heat.
11.1 In case of cast billet ingots, a tolerance of
7.2.3 Check analysis shall not apply to rimming + 5 mm shall be permitted on the specified width
steel. across flat.
8 SAMPLING 11.2 In case of billets, blooms and slabs, the
At least one ladle analysis shall be taken from following tolerances shall apply:

Sl No. Product Width Across Flat Thickness Tolerances on

Width/Thickness
mm mm mm
(1) (2) (3) (4) (5)
i) Billets Up to and including 75 — ± 1.5
> 75 to 125 — ± 3.0
> 125 to 150 — + 4.0
- 3.0
Over 150 — + 6.0
- 3.0
ii) Blooms Up to and including 150 — + 4.0
- 3.0
Over 150 — + 6.0
- 3.0
iii) Slabs — Up to and including 150 + 3.0
- 4.0
— Over 150 + 3.0
- 6.0
Up to and including 300 — + 3.0
- 6.0
Over 300 — + 5.0
- 10.0

3
IS 14650 : 2023

FIG. 1 LOCATION FOR TAKING SAMPLE FOR CHECK ANALYSIS

11.3 For other products, tolerances shall be blooms, the bend shall not exceed 5 mm per
subject to mutual agreement between the meter.
purchaser and the manufacturer.
11.6 Camber
11.4 A tolerance of ± 150 mm shall be permitted In the case of slabs, the camber shall not exceed
on the specified length. 8 mm per meter of slab length subject to a
maximum of 40 mm.
11.5 Bend
11.7 The following supplementary requirements
In the case of slabs, the bend shall not exceed of tolerance that are considered suitable for use
8 mm per meter of slab length subject to a with each material shall be applicable when
maximum of 40 mm. In the case of billets and mutually agreed to and specified in the order:

Sl No. Defects Product Tolerances

(1) (2) (3) (4)

i) Out of square Slab ≤ 0.01 x width in mm
Bloom/billet up to & 5 mm Max measured as
including 150 mm diagonal difference
in cross-section
Over 150 mm 7 mm Max

ii) Round corners Rolled slab Plain thickness at the extreme edge
shall be ≥ 0.5 x thickness in mm

iii) Ridges due to gas cutting Slab Less than or equal to uniform
ridges spread over the entire cross-
section. A single ridge of 20 mm or
limited number of ridges with
more than 5 mm depth

iv) Taper (width variation Slab 6 mm, Max

on top and bottoms
surface at one location)

v) Edge slanting (width Slab 10 mm, Max

variation on top and
bottom surface at one
location)

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 IS 14650 : 2023

Sl No. Defects Product Tolerances

(1) (2) (3) (4)

vi) Convexity (difference in Slab 6 mm, Max
thickness from edge to
curve)

vii) Chamfering (length Slab 10 mm, Max

variation on top and
bottom surface at one
location)
viii) Wedge(thickness Slab 3 mm, Max
variation at the edges
along the cross section)
ix) Scarfing pits Slab/bloom/billet Depth ≤ 0.05 x thickness
Width ≥ 6 x depth in mm

12 FREEDOM FROM DEFECTS 14 MARKING

12.1 Ingots shall either be supplied free from 14.1 Unless agreed otherwise, the material shall
harmful defects, such as, segregation, piping, be marked as given in 14.2 and 14.3.
cracks, inclusions and blow-holes by appropriate
14.2 Each material shall be legibly stamped or
top and bottom discard and dressing or supplied
painted or affixed with any heat proof label with
with suitable surface dressing only, without top
the cast number; and optionally with the name or
and bottom discard if mutually agreed to between
trade mark of the manufacturer.
the purchaser and the manufacturer.
14.3 The ends may be suitably painted as per the
12.2 The semi-finished products shall be free from
agreement between the purchaser and the
all harmful defects, such as cracks, surface flaws,
manufacturer.
laminations and rough, jagged & imperfect edges.
12.3 Billets, blooms and slabs shall be reasonably 14.4 BIS Certification Marking
free from camber, off flat, out of square, round
The product(s) conforming to the requirements of
corners, ridges of gas cutting, tapers and pit of
this standard may be certified as per the
scarfing.
conformity assessment schemes under the
provisions of the Bureau of Indian Standards Act,
13 OPTIONAL TESTS
2016 and the Rules and Regulations framed
13.1 If mutually agreed to between the purchaser thereunder, and the product(s) may be marked
and the manufacturer, the following tests may be with the Standard Mark.
carried out wherever applicable:
15 ORDERING INFORMATION
a) Macro examination (see IS 11371);
b) Sulphur print tests (see IS 12037); and While placing an order for the product(s) covered
c) Inclusion content (see IS 4163). by this standard, the purchaser should specify
clearly the following:
13.2 The acceptable limits for the above tests shall
be mutually agreed to between the purchaser and a) Steel grade;
the manufacturer, unless specified in the product b) Size;
standard. c) Tests and test report required;
d) Optional tests, if any as per 13;
13.3 Besides the tests mentioned at 13.1, any other e) Supplementary requirement, if any as per
test considered essential for ensuring the final 11.6; and
quality of product may also be carried out as f) Special requirements, if any.
agreed to between the manufacturer and the
purchaser.

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IS 14650 : 2023

ANNEX A
(Foreword)
COMMITTEE COMPOSITION
Wrought Steel Products Sectional Committee, MTD 04

Organization Representative(s)

SAIL, Research & Development Center for Iron & SHRI NIRVIK BANERJEE (Chairperson)
Steel, Ranchi

All India Induction Furnace Association, New Delhi SHRI A. K. SHARMA

SHRI PRABHAKAR MISHRA (Alternate)

AM/NS Steel Hazira, Surat SHRI DEEPAK GUPTA

SHRI KALPESH DAVE (Alternate)

Bharat Heavy Electrical Ltd, Bhopal SHRI S. K. MAHAJAN

SHRI ARUN KHARE (Alternate)

Central Boilers Board, New Delhi SHRI S. K. JAIN

Cold Rolled Steel Manufacturers Association of SHRI SHIVAJEE PATHAK

India, New Delhi SHRI N. K. SOOD (Alternate)

DMRL, Ministry of Defence, Hyderabad SHRI R. V. S. NAGESH

Indian Machine Tools Manufacturers Association SHRI Y. BALARAMAIAH

Bengaluru

Institute of Steel Development and Growth, Kolkata SHRI P. L. RAO

SHRI SAJAL KUMAR GHORAI (Alternate)

Jindal Steel & Power Ltd (JSPL), Raigarh SHRI JOY DUTTA

JSW Ltd, Bellary SHRI DEVASISH MISHRA

SHRI G. V. RAMANA (Alternate)

JSW Steel Ltd, Dolvi/Salem SHRI SUBHASIS CHAKRABORTY

SHRI B. M. HASAN (Alternate)

Ministry of Defence (DGOFB), Kolkata SHRI R. D. BARMA

Ministry of Defence (DGQA), Ichapur SHRI K.YADAV

SHRI G. SUBBA RAO (Alternate)

Ministry of Shipping, New Delhi SHRI ANIL PRUTHI

SHRI RAMJI SINGH (Alternate)

Ministry of Steel (Government of India), New Delhi SHRI PARMJEET SINGH

SHRI BHAGIRATHI PRADHAN (Alternate)

Power Grid Corporation, Gurugram SHRI MANOJ KUMAR GUPTA

SHRI DEEPAK KUMAR SAHOO (Alternate)

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 IS 14650 : 2023

Organization Representative(s)

Rashtriya Ispat Nigam Limited, Vishakapatnam SHRIMATI RUCHIRA GUPTA

SHRI SHANKAR JEE (Alternate)
Research Designs and Standards Organization SHRI MANOJ KUMAR GUPTA
(RDSO), Lucknow SHRI SHAILESH ORAON (Alternate)

SAIL, Bhilai Steel Plant, Bhilai SHRI SHRIRANG KHANKHOJE

SHRI K. V. SHANKAR (Alternate)

SAIL, Bokaro Steel Plant, Bokaro SHRIMATI BISWASI SUNITA MINZ

SHRIMATI ROSELIN DODRAE (Alternate)

SAIL, Research & Development center for Iron & SHRI P. PATHAK
Steel, Ranchi SHRI S. SRIKANTH (Alternate)

SAIL, Rourkela Steel Plant, Rourkela SHRI KUNTAL PATWARI

SHRI RAMAKRISHNAN P. (Alternate)

Society of Indian Automobile Manufacturers SHRI KARTIKE KARWAL

(SIAM), New Delhi SHRI KANISHKA CHANA (Alternate)

Steel Authority of India Limited, IISCO Steel Plant, SHRI A. DASGUPTA

Barddhaman SHRI SAIKAT DE (Alternate)

Tata Blue Scope Steel Ltd, Pune SHRI RAJESH MAHESHWARI

Tata Motors Ltd, Pune SHRI PRADEEP KULKARNI

SHRI LOKESH PALIWAL (Alternate)

Tata Steel Ltd, Jamshedpur SHRI AVTAR SINGH SAINI

SHRI SUDIPTO SARKAR (Alternate)

The Tin Plate Company of India Ltd, Jameshedpur SHRI S. J. DEY

SHRI SUBRATA SADHU (Alternate)

In Personal Capacity, New Delhi SHRI A. C. R. DAS

BIS Directorate General SHRI SANJIV MAINI, SCIENTIST ‘F’/SENIOR

DIRECTOR AND HEAD (METALLURGICAL
ENGINEERING) [REPRESENTING DIRECTOR
GENERAL (Ex-officio)]

Member Secretary
SHRI ARUN PUCCHAKAYALA
SCIENTIST ‘D’/JOINT DIRECTOR
(METALLURGICAL ENGINEERING), BIS

7
Bureau of Indian Standards

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development of the activities of standardization, marking and quality certification of goods and attending to
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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
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should ascertain that they are in possession of the latest amendments or edition by referring to the website-
www.bis.gov.in or www.standardsbis.in
This Indian Standard has been developed from Doc No.: MTD 04 (21561).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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