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IS 5488 (1987): Dimensions and dimensional tolerances forhot rolled steel plates for ship's hull structure [CED 7:Structural Engineering and structural sections]

IS:5488 -1987

Indian Standard DIMENSIONS AND DIMENSIONAL

TOLERANCES FOR HOT-ROLLED STEEL PLATES FOR SHIP’S HULL STRUCTURE

(First Revision)

Structural Sections Sectional Committee, SMDC 6

Chu irman

SHRI M. DHAR Flat No. 56, E-l Kailash Apartment,

New Delhi

Members Representing

SHRI V. K. AGRAWAL Hindustan Aluminium Corporation Ltd, Renukoot

SHRI N. G. SHARMA ( Alternate > SHRI R. N. AGGARWAL Steel Authority of India Ltd (Bokaro Steel

SHRI B. K. SRIVASTAVA (Alternate ) Plant ), Bokaro

SHRI S. BANERJEE Steel Re-Rolling Mills Association of India, Calcutta

SHRI A. P. BHAYNAGAR Steel Authority of India Ltd (Durgapur Steel

SHRI P. K. DEBNATH ( AIternute ) Plant ), Durgapur

SHRI N. BHATTACHARYA Garden Reach Shipbuilder & Engineers Ltd,

SHRI C. S. CHAUHA

SHRI B. B. CHAKRAVERTI

Calcutta Directorate General of Supplies & Disposals

( Inspection Wing ), New Delhi Superintendence Co of India (Pvt) Ltd,

Calcutta SHRI A. K. SHOME ( Alternote )

SHRI D. S. DESAI M. N. Dastur & Co Pvt Ltd, Calcutta SHRI B. K. DUTTA Iron & Steel Control. Calcutta

SHRI S. S. SAHA ( Alternote)

( Continued onpage 2 )

0 Copyright 1987

BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

IS ~5488 - 1987

( Continued from page 1 ) Members

SHRI S. K. GANGULV SHRI M. P. JASUJA

Represen ring

Institution of Engineers ( India ), Calcutta Steel Authority of India Ltd ( Research &

Development Centre for Iron & Steel ), Ranchi

JOINT DIRECTOR STANDARDS ( WAOON I ), RDSO

Ministry of Railways

JOINT DIRECTOR STANDARDS ( B & S ) SB, RDSO ( Alternate )

SHRI A. J. JOSHI Steel Authority of India Ltd (Bhilai Steel Plant ), Bhilai

SHRI A. G. RAMA RAO ( Alternate ) LT-COL KULWANT SINGH Engineer-in-Chief’s Branch, Army Headquarters,

New lklhi _ _ - _ ._ _ MAJOR S. B. PURI ( Alternate)

SHRI S. K. MITRA Indian Iron & Steel Co Ltd. Burnpur SHRI S. DUTTA ( Alternate ‘r

SHRI P. K. MUKHE~JEE ’ Braithwaite & Co Ltd, Calcutta SHRI AMIT KUMAR BHATTACHARY~

( Alternate ) SHRI P. V. NAIK Richardson & Cruddas Ltd, Bombay SHRI KAMMAL PRAKASH Metallureical & Engineering Consultants

( India ) Ltd, Ranchi- SHRI C. S. KANNAN ( Alternate )

SHRI N. S. R. V. RAJU Hindustan Shipyard Ltd, Visakhapat nam SHRI D. KRISHNAMURTHY ( Alternote )

SHRI S. K. SADHU Jessop & Co Ltd, Calcutta SHRI S. C. CHAKRAVARTI ( Alternrrte )

SHRI S. K. SARNA Visakhapatnam Steel Project, Visakhapatnam SHRI G. N. RAO (Alternate)

SHRI M. C. SARANGDHAR Stup & Co Ltd, Bombay SHRI M. K. CHATTERJEE ( A lternate )

SHRI K. R. SENGUPTA Joint Plant Committee, Calcutta SHRI B. P. GHOSH ( A Iternate)

SHRI S. N. SINGH EMC Steelal Ltd, Calcutta SHRI C. K. NAG ( AIternate)

SHRI K. S. SRINIVASAN National Buildines Organization. New Delhi SHRI A. K. LAL ( Alternate )

SHRI K. SURYANARAYANAN Indian Aluminium Co Ltd, Calcutta SHRI G. M. MENON ( Alternate )

SHRI D. THIRUVENGADAM Tube Products of India, Madras c

SHRI K. V. VIJAYARAGHAVAN ( Alternate )

SHRI S. G. TUDEKAR Steel Authority of India Ltd ( Rourkela Steel Plant ) , Rourkela

SHRI J. N. BHAMBRY ( Alternute ) SHRI P. VISHWAKARMA Tata Iron & Steel Co Ltd, Jamshedpur

SHRI A. HAQUE ( Aiternrite) SHRI B. MUKHERII, Director General, BIS ( Ex-oficio Member ) Director ( Strut & Met )

Secretary SHRI S. S. SETHI

Joint Director ( Strut & Met ), BIS ( Continued on page 8 )

2

IS : 5488 - 1987

Indian Standard

DIMENSIONS AND DIMENSIONAL TOLERANCES FOR HOT-ROLLED STEEL PLATES FOR SHIP’S HULL STRUCTURE

( First Revision) 0. FOREWORD

0.1 This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards on 24 June 1987, after the draft finalized by the Structural Sections Sectional Committee had been approved by the Structural and Metals Division Council.

0.2 IS : 1730 ( Part 1 )-1974* covers mainly dimensions of steel plates for structural and general engineering purposes. In order to cover a wider range of size and closer tolerances required for ship’s hull, this standard has been formulated.

0.3 This standard was first published in 1969. In this revision, the sizes of plates have been realigned on the pattern of IS : 1730 ( Part 1 )-1974” thereby giving more flexibility in choosing appropriate thickness of plates required. Tolerances on thicknesses have been made stringent.

0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, express- ing the result of a test or analysis, shall .be rounded off in accordance with IS : 2-1960t. The number of significant places retained in the rounded off value should be the same as that of the specified value in this _ _ standard.

1. SCOPE

1.1 This standard specifies dimensions, and rolling for hot-rolled steel plates for ship’s hull structure.

L

and cutting tolerances

*Dimensions for steel plate, sheet and strip for structural and general engi- neering purposes (first revision ).

tRules for rounding off numerical values ( revised ).

3

IS : 5488 - 1987

1.2 This standard is mainly intended to cover plates rolled from steel con- forming to IS : 3039-1980*.

2. DESIGNATION

2.1 Plates for ship’s hull shall be designated as ISSP followed by figures denoting thickness (mm) x width (mm) x length (mm) of the plate, for example, ISSP 6 x 1 000 x 6 000.

3. DIMENSIONS

3.1 Thickness - The nominal thickness of plates in mm shall be as follows:

5.0, 6.0, 7.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 25*0,28*0, 32.0, 360, 40.0, 45.0, 50.0, 56-O and 63-O.

3.1.1 For ship repair and ship construction, plates of thickness other than those mentioned in 3.1 in steps OF O-5 mm are also used. However, their supply shall be subject to the agreement with the customer.

3.1.2 Tolerance on Thickness - The tolerance on thickness shall be as follows:

Thickness

mm

Up to and including 12

Over 12 up to and including

Over 15 up to and including

Over 45

Tolerance r_--_h_-_-7 Plus Minus

(mm)

15

7 percent of thickness 0.4

5 percent of thickness 0.4

45 4 percent of thickness (0.02 tt + 0.1)

4 percent of thickness 1.0 L

NOTE - Tolerances stringent than those specified above may be obtained subject to negotiation with the supplier.

3.1.3 The thickness shall be measured at each corner, in the middle of each width and in the middle of each length of each plate. These measure- ments shall be 50 mm away from the edge and at points arbitrarily

*Specification for structural steel for construction of hull of ships (first revz’sion ). tt is the thickness of the plate.

4

IS : w38 - 1987

chosen. The thickness measured at each of these points shall satisfy the tolerances specified in 3.1.2.

3.2 Length and Width - The nominal sizes of plates corresponding to the thickness, as specified in 3.1, shall be as given in Table 1.

3.3 Tolerance on Width and Length of Sheared Plates

3.3.1 Width - The tolerance on width of plate shall bf: as follows:

Length Width Tolerance on Width for Thickness of mm mm ------ -h-.-----~

Up to and Inclu- Over 20 mm ding 20 mm

~__-h__ --7 Plus Minus %i Minus mm mm mm mm

Up to and inclu- Up to and inclu- 10 0.0 15 0.0 ding 8 000 ding 2 000

Up to and inclu- Over 2 000 0.5 percent 0.0 20 0.0 ding 8 000 of width

Over 8000 All widths 0.2 percent 0.0 0.3 percent 0.0 of length of length

NOTE 1 - Plates over 32 mm in thickness may be supplied with either as- rolled or gas-cut edges. The tolerance on width in such cases shall be subjected to agreement between the purchaser and the supplier.

NOTE 2 - Plates below 32 mm in thickness are supplied in as-rolled condi- tion, the tolerances shall be mutually agreed to between the purchaser and the supplier.

3.3.2 Length 3.3.2.1 The tolerance on length of plate produced in non-continuous

mill shall be as follows:

Length r-_&_7 lover Up to and

Including

mm mm

- 6 000

6 000 8 000

8 000 -

Tolerance on Length for Thickness ~_~__~~~~~h~_~_~~~~

Up to and Including 20 mm Over 20 mm r-_--h-__~ _-h-_T

Plus Minus Plus Minus mm mm mm mm

0.5 percent 0.0 0.5 percent 0.0 of length of length

35 0.0 0.5 percent 0 *O of length

35 0.0 40 0.0

5

3 . . TABLE 1 NOMINAL SIZES OF PLATES

( Clause 3.2 )

All dimensions in millimetres.

Length 4 Maximum Thickness of Plates --- --

5 000 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63

6000 63 63 63 63 63 63 63 63 63 56 56 50 50 45 45 40

7 000 63 63 63 63 63 63 63 63 56 56 50 45 45 40 40 36

8 000 63 63 63 63 63 63 63 56 50 4.5 45 40 40 36 36 32

m 9 300 63 63 63 63 56 56 56 50 45 40 40 36 36 32 32 28 JO 000 63 63 63 56 50 50 50 45 40 36 36 32 32 28 28 25

11 000 63 63 56 50 50 50 45 40 36 32 32 28 28 25 25 22

12 000 63 63 56 50 45 45 40 36 32 28 28 25 25 22 22 20

12 500 63 63 56 50 45 45 40 36 32 28 28 25 25 22 22 20

13 000 63 56 50 45 40 40 36 32 28 25 25 25 25 22 22 20

13 500 63 56 50 45 40 40 36 32 28 25 25 25 25 22 22 20

14 000 63 56 50 45 40 40 36 32 28 25 25 25 25 22 22 20 15 000 56 50 45 40 40 36 32 28 25 25 25 25 22 22 20 20'

NOTE 1 - This table gives the values of maximum thickness for each combination of tiidth and length. This means that any thickness ( see 3.1 and 3.1.1) less than the maximum thickness specified in this table is available for the particular width x length combination.

NOTE 2 - Supply in width and lengths, other than those given above, may be done as per mutual agreement.

c

TS:5488-1987

3.3.2.2 Length - The tolerance for length of plates from 5 to 10 mm thickness, when produced in continuous mill, shall be plus 1 percent of the length subject to a maximum of 70 mm. The minus tolerance for length shall be nil.

NOTE - Plates over 32 mm in thickness may be supplied with either as-rolled or gas-cut edges. The length tolerance in such cases shall be subject to agreement between the purchaser and the supplier.

3.4 Mass - The nominal mass of the plates shall be calculated on the basis of 7.85 kg/m2 per mm of thickness.

IS : 5488 - 1987

( Continued from page 2 )

Panel for Dimensions for Hot-Rolled Steel Plates for Ship’s Hull Structures, SMDC 6 : P16

Convener

SHRI P. LAXMINARAYANA

Members

Representing

Hindustan Shipyard Ltd, Visakhapatnam

LT M. BANERJEE SHRI T. N. BASU

Ministry of Defence ( Navy ) Garden Reach Shipbuilders & Engineers

Calcutta Ltd,

SHRI S. K. GHOSE ( AZternate ) SHRI CHANDRAKANT Steel Authority of India Ltd ( Bhilai

Plant ), Bhilai SHRI K. K. HANDA Steel Authority of India Ltd (Bokaro

Plant ), Bokaro

Steel

Steel

SHR~ S. S. DHANOIA ( Alternate ) SHRI MADAN LAL KOCHHAR American Bureau of Shipping, Bombay

SHRI T. PARTHASARTHY ( Alternate ) SHRI K. MANOHARAN Cochin Shipyard Ltd, Cochin SHRI P. G. NAMBIAR Mazagon Dock Ltd, Bombay

SHRI S. K. DEV ( Alternate) SHFU P.M. PATKAR Det Norske Veritas, Bombay

SHRI P. P. KAORAY (Alternate) SHRI Y. P. SHARMA Steel Authority of India Ltd ( Rourkela Steel

Plant ), Rourkela SHRI P. B. RAO ( Alternate)

8