IS 15914: High Tensile Strength Flat Rolled Steel Plate (Up To 6 mm), Sheet and Strip for the Manufacture of Welded Gas Cylinder

2011·0.92 MB·English

by  Bureau of Indian Standards

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IS 15914 (2011): High Tensile Strength Flat Rolled Steel
Plate (Up To 6 mm), Sheet and Strip for the Manufacture of
Welded Gas Cylinder [MTD 4: Wrought Steel Products]
“!ान $ एक न’ भारत का +नम-ण”
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IS 15914 : 2011
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—
Indian Standard
HIGH TENSILE STRENGTH FLAT ROLLED STEEL
PLATE (UP TO 6 mm), SHEET AND STRIP FOR
THE MANUFACTURE OF WELDED GAS CYLINDER —
SPECIFICATION
ICS 77.140.30
© BIS 2011
B U R E A U O F I N D I A N S T A N D A R D S
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
September 2011 Price Group 3
Wrought Steel Products Sectional Committee, MTD 4
FOREWORD
This Indian Standard 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.
Various international standards exists for high strength LPG cylinders. These standards specify requirements
for hot rolled steel sheets/strips/coils of high tensile strength grades as raw material, intended for
manufacturing welded gas cylinders. Steel weldments are normalized to refine the structure within weld-
affected area and modification of residual stresses. These grades are produced in India and supplied to
customers for export quality cylinders.
In India, LPG grade (YS: 240 MPa minimum) is being produced as per IS 6240 : 2008 ‘Hot rolled steel plate (up
to 6 mm) sheet and strip for the manufacture of low pressure liquefiable gas cylinder and liquefied petroleum
gas (LPG) containers for automotive use (fourth revision)’. There is a need to include high strength grades in
IS 6240 or to formulate a separate specification for this. Keeping this in view, the Committee decided to
formulate a separate specification in line with ISO 4978 : 1983 ‘Flat rolled steel products for welded gas
cylinders’. This will facilitate production of thinner gauge gas cylinder, which in turn reduce the weight of
domestic/auto and industrial cylinder. Benefit of these light weight cylinders includes more number of cylinders
per tonne of steel and ease of handling and transportation.
For all the tests specified in this standard (chemical/physical/others), the method as specified in relevant ISO
Standard may also be followed as an alternate method.
In the formulation of this standard, assistance has been derived from ISO 4978 : 1983 ‘Flat rolled steel
products for welded gas cylinders’.
The composition of the Committee responsible for 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 : 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.
IS 15914 : 2011
Indian Standard
HIGH TENSILE STRENGTH FLAT ROLLED STEEL
PLATE (UP TO 6 mm), SHEET AND STRIP FOR
THE MANUFACTURE OF WELDED GAS CYLINDER —
SPECIFICATION
1 SCOPE definitions given in IS 1956 (Part 4) and the following
shall apply.
This standard covers the requirements for deep
drawing quality hot rolled steel plate (up to 6 mm), 3.1 Coil — A rolled flat strip product which is wound
sheet and strip for the manufacture of welded gas into regularly superimposed laps so as to form a coil
cylinders. with almost flat side. It shall have at least 50 laps.
2 REFERENCES 3.2 Micro-alloying Elements — Elements, such as
niobium, vanadium and titanium, added singly or in
The following standards contain provisions, which
combination to obtain higher strength levels
through reference in this text constitute provisions
combined with better formability, weldability and
of this standard. At the time of publication, the
toughness as compared with non-alloyed steel
editions indicated were valid. All standards are
produced to equivalent strength levels.
subject to revision and parties to agreements based
on this standard are encouraged to investigate the 4 SUPPLY OF MATERIAL
possibility of applying the most recent editions of
4.1 General requirements relating to the supply of
the standards indicated below:
material shall conform to IS 8910.
IS No. Title
4.2 Hot rolled steel plates and sheets covered by
228 (in various Methods for chemical analysis of this standard shall be supplied in straight lengths
parts) steels and strips in coils.
1608 : 2005 Metallic materials — Tensile
5 MANUFACTURE
testing at ambient temperature
(third revision)
5.1 The processes used in making the steel and in
1730 : 1989 Steel plates, sheets, strips and manufacturing hot rolled steel plate, sheet and strip
flats for structural and general are left to the discretion of the manufacturer.
engineering purposes (second
5.1.1 However, in case sheets and strips are
revision)
manufactured through thin slab casting route, the
1956 (Part 4) : Glossary of terms relating to iron
manufacturing process shall be suitably qualified on
1975 and steel: Part 4 Steel sheet and
the basis of adequate data to ensure freedom from
strip (first revision)
centre line segregation, material inconsistency,
3803 (Part 1) : Steel — Conversion of
internal cracks and poor surface quality.
1989 elongation values: Part 1 Carbon
and low alloy steels (second 5.2 The steel shall be of fully aluminum killed and
revision) non-ageing quality. However, other elements which,
8910 : 2010 General technical delivery by binding the nitrogen, have a similar effect may
requirements for steel and steel also be used instead of, or in addition to, aluminium
products (first revision) (see also Table 1).
13566 : 1992 Recommended practice of 6 CHEMICAL COMPOSITION
pickling by H SO levelling and
oiling of LPG 2shee4ts 6.1 Ladle Analysis
IS/ISO 16160 : Continuously hot-rolled steel Ladle analysis of the material, when carried out either
2005 sheet products — Dimensional by the method specified in the relevant parts of
and shape tolerances IS 228 or any other established instrumental/chemical
method shall be as given in Table 1. In case of dispute,
3 TERMINOLOGY
the procedure given in the relevant part of IS 228
For the purpose of this standard, the following shall be the referee method. However, where the
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IS 15914 : 2011
Table 1 Chemical Composition
(Clauses 5.2, 6.1 and 6.2)
Constituent, Percent
Sl No. Grade Carbon Manganese Silicon Sulphur Phosphorus Aluminium
Max Min Max Max Max Min
(1) (2) (3) (4) (5) (6) (7) (8)
i) HS 235 0.16 0.30 0.25 0.025 0.025 0.015
ii) HS 265 0.18 0.40 0.30 0.025 0.025 0.015
iii) HS 295 0.19 0.50 0.35 0.025 0.025 0.015
iv) HS 345 0.20 0.70 0.45 0.025 0.025 0.015
NOTES
1 Elements not listed in this table may not be added intentionally to the steel. All suitable arrangements are to be made to
prevent such elements being added from scrap or other materials used during manufacture, which impair the mechanical
properties and usability.
2 Steel may be supplied with the addition of micro-alloying elements like niobium, titanium, vanadium and boron. The micro-
alloying elements shall not exceed 0.10 percent when added individually or in combination.
3 The nitrogen content of the steel shall not be more than 0.009 percent. This has to be ensured by the manufacturer by
occasional check analysis.
method is not given in IS 228 and its relevant parts, The test pieces taken for tensile test shall be from
the referee method shall be as agreed to between the the direction transverse to the direction of rolling. In
purchaser and the manufacturer. case of coils, one sample shall be tested from each
coil.
6.1.1 Alternatively the method specified in relevant
ISO/IEC Standard may be used. 7.1.1 When plate, sheets and strips of more than
one thickness are rolled from the same cast, one
6.2 Product Analysis
additional tensile test shall be made for each
Permissible variations in case of product analysis thickness.
from the limits specified in Table 1 shall be as given
7.2 Tensile Test
in Table 2.
The tensile test shall be carried out in accordance
Table 2 Permissible Variations for Product Analysis
with IS 1608, generally using a proportional gauge
Sl No. Constituent Permissible Variations length L = 5.65 S , where S is the cross-sectional
o o o
Over the Maximum and area of the test piece. Test pieces with a non-
Under the Minimum
proportional gauge length may be used; in this case
Specified Limit, Percent
Max the elongation values shall be converted in
accordance with IS 3803 (Part 1). The tensile strength,
(1) (2) (3)
yield stress and percentage elongation shall be as
i) Carbon 0.02
given in Table3.
ii) Manganese 0.03
iii) Silicon 0.03 7.2.1 Should a test piece break outside the middle
iv) Sulphur 0.005 half of its gauge length and the percentage elongation
v) Phosphorus 0.005 obtained is less than that specified, the test may be
NOTE — Aluminium content shall not be less than 0.015 discarded at the option of the manufacturer and
percent. another test made from the sample selected
representing the same cast and batch.
7 TENSILE TEST
8 RETEST
7.1 Number of Tensile Tests
If a test does not give the specified results, two
Number of samples to be tested from a cast/heat,
additional tests shall be carried out at random on the
rolled or processed, shall be as follows:
same lot. Both retests shall conform to the
requirements of this standard, otherwise, the lot shall
a) For cast/heat size up to 100 tonne —
be rejected.
2samples;
b) For cast size between 100 and 200 tonne — 9 FREEDOM FROM DEFECTS
3samples; and
The finished material shall be free from harmful
c) For cast size over 200 tonne — 4 samples.
defects such as seams, pipe, lamination, cracks,
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IS 15914 : 2011
Table 3 Mechanical Properties
(Clause 7.2)
Sl No. Grade Tensile Yield Stress Percent Elongation Reference Heat
Strength MPa at Gauge Length Treatment Austenitizing
MPa 5.65 S Temperature1)
o
Min Min Min
(1) (2) (3) (4) (5) (6)
i) HS 235 360-460 235 25 920-960
ii) HS 265 410-510 265 22 890-930
iii) HS 295 450-560 295 20 890-930
iv) HS 245 490-610 345 18 880-920
NOTE — The above properties are specified for cold formed and normalized cylinder. However tensile properties of hot rolled
plate/sheet/strip are to be mutually agreed upon by the producer and by the cylinder manufacturer.
1)Time at austenitizing temperature: approximately 2 min/mm of plate thickness.
slivers, rolled-in-scale, blisters and pitted surface 11.2 Subject to prior agreement between the
which will impair the drawability. manufacturer and the purchaser, the material may be
pickled and levelled with a suitable protective
NOTE — When the material is supplied in the form of
treatment in accordance with IS 13566.
coils, the degree or amount of surface defects are expected
to be more than in cut length sheets since the inspection
12 WELDABILITY
of coils does not afford the same opportunity to reject
the portion containing defects as with cut length. However,
The steels are weldable by the usually fusion welding
an excessive amount of defects may be a cause for
rejection. It may be noted that hot rolled material may processes.
have some tertiary scale on the surface of the product
and the presence of such scale should not be considered as 13 MARKING
surface defect.
13.1 Steel plates and sheets shall be supplied in
10 DIMENSIONS AND TOLERANCES bundles and strips in coils. The mass of the bundle
or coil shall be as agreed to between the purchaser
10.1 Unless otherwise specified, the dimensions of
and the manufacturer. Each plate and sheet in each
steel plate, sheet and strip shall conform to the
bundle shall be legibly marked with the cast/coil
dimensions as given in IS 1730.
number. The top sheet in each bundle shall also be
10.2 Unless otherwise specified, the dimensional marked with the name of the manufacturer or trade-
and shape tolerances of steel plate, sheet and mark. Each bundle shall further carry a metal tag
strip shall conform to the requirements as given in bearing the cast/coil number and the manufacturer’s
IS/ISO 16160. name or trade-mark or such information may be given
on the top of the steel envelope containing the sheets
11 CONDITION OF DELIVERY
during packing. In case of coils, each coil shall be
11.1 The delivery condition shall be agreed at the legibly marked with the cast/coil number, grade and
time of enquiry and order. The material may be manufacturer’s name or trade-mark.
supplied in ‘hot rolled and normalized’ or ‘hot rolled
13.2 BIS Certification Marking
under controlled conditions’.
The material may also be marked with Standard Mark.
The products can however, also be delivered in other
conditions such as, 13.2.1 The use of the Standard Mark is governed
by the provisions of the Bureau of Indian Standards
a) hot rolled;
Act, 1986 and the Rules and Regulations made
b) hot rolled and pickled;
thereunder. The details of conditions under which
c) cold rolled; and
the licence for the use of the Standard Mark may be
d) cold rolled and annealed. granted to manufacturers or producers may be
obtained from the Bureau of Indian Standards.
NOTE — The terms ‘hot rolled normalized’ or ‘hot rolled
under controlled conditions’ refer to the conditions leading
to a structure and to properties typical of those for
material in the normalized condition.

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IS 15914 : 2011
ANNEX A
(Foreword)
COMMITTEE COMPOSITION
Wrought Steel Products Sectional Committee, MTD 4
Organization Representative(s)
Tata Steel Ltd, Jamshedpur DR D. BHATTACHRJEE (Chairman)
SHRI INDRANIL CHAKRABORTY (Alternate I)
DR A. N. BHAGAT (Alternate II)
All India Induction Furnace Association, New Delhi SHRI L. N. GOSWAMI
Bharat Heavy Electricals Ltd, Tiruchirapalli SHRI V. RAJASEKHARAN
Central Boilers Board, New Delhi REPRESENTATIVE
Central Public Works Department, New Delhi CHIEF ENGINEER (NDR)
DGS&D, Bhilai Nagar/Delhi REPRESENTATIVE
Escorts Knowledge Management Centre, Faridabad SHRI ALOK NAYAR
Essar Steels Ltd, Hazira DR A. K. DAS
SHRI R. K. BALASUBRAMANIAM (Alternate)
Instiute of Steel Development and Growth, Kolkata SHRI JAYANTA KUMAR SAHA
Jindal South West Ltd, Vasind SHRI M.K. MAHESHWARI
M.N. Dastur & Co Ltd, Kolkata/Delhi SHRI SUBHABRATA SENGUPTA
SHRI V. K. TYAGI (Alternate)
Ministry of Defence (DGOFB), Kolkata SHRI P. S. BANDHOPADHYAY
SHRI T. BASU (Alternate)
Ministry of Defence (DGQA), Ichapur SHRI S. K. KHILNANEY
SHRI P. MEENA (Alternate)
Ministry of Railways (RDSO), Lucknow SHRI RADHEY SHAM
SHRI V. D. MEHARKURE (Alternate)
Ministry of Steel (Government of India), New Delhi SHRI A. C. R. DAS
SHRI B. D. GHOSH (Alternate)
Power Grid Corporation of India Ltd, Gurgaon SHRI K. N. M. RAO
SHRI M.K. SETHI (Alternate)
Rashtriya Ispat Nigam Ltd (VSP), Vishkhapatnam SHRI P. K. SEN
SHRI P. SRINIVAS (Alternate)
SAIL, Bhilai Steel Plant, Bhilai SHRI S. BHATTACHARYA
SHRI P. K. DATTA (Alternate)
SAIL, Bokaro Steel Plant, Bokaro DR M. M. S. SODHI
SHRI P. S. REDDY (Alternate)
SAIL, Central Marketing Organization, Kolkata SHRI P. C. JHA
SHRI B. V. S.PANDIT (Alternate)
SAIL, Research & Development Center for Iron & Steel, Ranchi DR B. K. JHA
SHRI ATUL SAXENA (Alternate)
SAIL, Rourkela Steel Plant, Rourkela SHRI C. MUTHUSWAMY
SHRI S. MUKHOPADHYAYA (Alternate)
Steel Re-rolling Mills Association of India, Mandi Gobindgarh SHRI B. M. BERIWALA
COL SURINDER SINGH (Alternate)

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IS 15914 : 2011
Organization Representative(s)
Tata Motors Limited, Pune SHRI B. R. GALGALI
SHRI U. B. PATHAK (Alternate)
Tata BlueScope Steel Ltd, Pune SHRI RAJESH MAHESHWARI
SHRI SANJAY SARASWAT (Alternate)
TCE Consulting Engineers, Jamshedpur DR M. D. MAHESHWARI
BIS Directorate General DR (SHRIMATI) SNEH BHATLA, Scientist ‘F’ and Head (MTD)
[Representing Director General (Ex-officio)]
Member Secretary
SHRI DEEPAK JAIN
Scientist ‘E’ (MTD), BIS
Flat Steel Products Subcommittee, MTD 4 : 3
TCE Consulting Engineers, Jamshedpur DR M. D. MAHESHWARI (Convener)
Bhushan Power and Steel Ltd, Hooghly SHRI P. S. PAUL
Federation of Engineering Industries of India, New Delhi SHRI H. L. BHARDWAJ
SHRI H. L. BANSAL (Alternate)
Indian Oil Corporation Limited, Noida SHRI M. K. JHA
SHRI T. BANDHOPADHYAY (Alternate)
Ispat Industries Limited, Dolvi SHRI RAMBRIKSH SINGH
SHRI RAJENDERA K. VERMA (Alternate)
Metal Containers Manufacturers Association, New Delhi SHRI SANJAY BHATIA
SHRI DIWAKAR SHETTY (Alternate)
SAIL, Bhilai Steel Plant, Bhilai SHRI A. DASGUPTA
SHRI K. L. BALASUBRAMANAIAN (Alternate)
SAIL, R&D Centre for Iron & Steel, Ranchi SHRIMATI ANJANA DEVA
SAIL, Salem Steel Plant, Salem SHRI S. S. SISODIA
Tata Motors Limited, Pune SHRI V. HARIHARAN
Tata Steel Ltd, Jamshedpur SHRI M. SHOME
The Tin Plate Company of India Ltd, Jamshedpur SHRI T. K. GHOSH
SHRI A. K. GHOSH (Alternate)
Thyssenkrupp Electrical Steel India Pvt Ltd, Nashik SHRI J. SREENIVAS
SHRI KAPIL KAPOOR (Alternate)
Welspun Gujrat Sthal Rohren Ltd, Anjar SHRI B. LAKSHMINARASIMHAM

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