IS 2041 : 1995(Reaffirmed 2000)

Edition 3.1(1997-10)

Indian Standard

STEEL PLATES FOR PRESSURE VESSELSUSED AT MODERATE AND LOW

TEMPERATURE — SPECIFICATION

( Second Revision )(Incorporating Amendment No. 1)

UDC 669.14-41 : 621.642.02

© BIS 2002

B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Price Group 3

Wrought Steel Products Sectional Committee, MTD 4

FOREWORD

This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after thedraft finalized by the Wrought Steel Products Sectional Committee had been approved byMetallurgical Engineering Division Council.This standard was first published in 1962 and subsequently revised in 1982. While reviewing thestandard in the light of experiences gained during these years, the Committee decided to revise itto bring it in line with the present practices being followed by the Indian industry.In this revision, the following changes have been made:

a) Number of grades of steel plates for pressure vessels used at moderate and low temperaturehave been reduced to three by deleting Grade 4.

b) Chemical composition and mechanical properties have been modified.c) Requirements of heat treatment has been modified and provision of re-heat treatment has

been included for material which fails to meet the requirement of mechanical properties ininitial testing.

d) Dimensional tolerances have been modified.In the preparation of this standard, necessary assistance has been derived from the followingoverseas standards:

BS 1501 (Part 1) : 1980 ‘Steels for fired and unfired pressure vessel plates: Part 1 Carbon andcarbon manganese steels’, issued by the British Standards Institution (BSI).ASTM A 516-1984 ‘Specification for pressure vessel plates, carbon steel for moderate and lowertemperature services’, issued by the American Society for Testing and Materials (ASTM).

This edition 3.1 incorporates Amendment No. 1 (October 1997). Side bar indicates modification ofthe text as the result of incorporation of the amendment.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, shall be rounded off inaccordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The number ofsignificant places retained in the rounded off value should be the same as that of the specifiedvalue in this standard.

IS 2041 : 1995

1

Indian Standard

STEEL PLATES FOR PRESSURE VESSELSUSED AT MODERATE AND LOW

TEMPERATURE — SPECIFICATION

( Second Revision )

1 SCOPE

This standard covers the requirements of steelplates for fabrication of fusion welded pressurevessels for moderate and low temperatureservices.

2 REFERENCES

The following Indian Standards are necessaryadjuncts to this standard:

3 GENERAL REQUIREMENTS

3.1 General requirements relating to supply ofmaterial shall conform to IS 8910 : 1978.3.2 Order shall include the followinginformations, as applicable:

a) Quantity (weight or number of pieces ofplates);

b) Dimensions of plates;c) Grade designation;d) Heat treatment conditions;e) Impact test requirements, if any;f) Inspection and testing conditions, if any;g) Additional requirements, if any.

4 GRADES

There shall be three grades of steel plates forpressure vessels used as moderate and lowtemperature designated as Grade 1, Grade 2and Grade 3.

5 MANUFACTURE

5.1 Steel shall be manufactured by any processof steel making at the discretion of themanufacturer.5.2 The steel shall be of killed quality. Theaustenitic grain size shall be 5 or finer whenestimated in accordance with IS 4748 : 1988.One test per cast shall be conducted fordetermination of grain size.5.2.1 Test on grain size shall not be required ifthe aluminium content of steel is not less than0.020 percent.5.3 When rolled from continuously cast slabs,ratio of slab to plate thickness shall beminimum 4 to 1.

6 CHEMICAL COMPOSITION

6.1 The ladle analysis of the material, whencarried out by the method specified in therelevant parts of IS 228 or other establishedinstrumental/chemical method shall be asgiven in Table 1. In case of dispute theprocedure given in relevant part of IS 228 shallbe the referee method. However, where themethod is not given in IS 228 or its relevantparts, the referee method shall be as agreed tobetween the purchaser and the manufacturer.

IS No. Title

228 Methods for chemical analysisof steel

1599 : 1985 Method for bend test ( secondrevision )

1608 : 1995 M echanical testing of m etals —Tensile testing ( second rev ision )

1757 : 1988 Method for Charpy impact test(V-notch) for metallic materials( second revision )

3803(Part 1) : 1989

Steel-conversion of elongationvalues: Part 1 Carbon and lowalloy steels ( second revision )

4748 : 1988 Methods of estimating averagegrain size of metals ( firstrevision )

8910 : 1978 General technical deliveryrequirements for steel and steelproducts

11630 : 1986 Method for ultrasonic testing ofsteel plates for pressure vesselsand special applications

IS 2041 : 1995

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6.2 Product Analysis

Permissible variation in the case of productanalysis from the limits specified in 6.1 shall beas given in Table 2.

7 HEAT-TREATMENT

7.1 Grade 1 and Grade 2 plates of thicknessabove 12 mm shall be supplied in normalizedcondition. Plates of thickness 12 mm and belowshall be supplied in as rolled condition unlessagreed otherwise.

7.2 Grade 3 plates shall be either normalized orcontrolled rolled.

8 FREEDOM FROM DEFECTS

8.1 The finished plates shall be reasonably freefrom harmful defects, such as cracks, seams,laminations, rough and jagged edges, etc.8.2 Superficial defects may be removed bygrinding or by other suitable means, providedthe material is not reduced below thepermissible limits of tolerance at the dressedspot. Hammer dressing, patching by welding,etc, shall not be permitted.

8.3 Edge Imperfection

8.3.1 Line discontinuities 25 mm and less inlength on the edges of a plate are acceptable.8.3.2 Edge imperfections beyond the limitof 8.3.1 may be ground to the acceptable limitprovided plate size remains within respectivetolerance.

9 TOLERANCES

9.1 Thickness

9.1.1 No plate shall be under the nominalthickness at any place.9.1.2 The positive tolerance on the thickness ofthe plates shall not exceed the limits stated inTable 3.

Table 1 Chemical Composition( Clause 6.1 )

Grade Constituent, Percent

CMax

Si Mn PMax

SMax

NbMax

VMax

(1) (2) (3) (4) (5) (6) (7) (8)

1 0.20 0.15-0.35 0.60-1.20 0.035 0.035 — —

2 0.25 0.15-0.35 0.85-1.20 0.035 0.035 — —

3 0.20 0.15-0.35 0.85-1.20 0.035 0.035 0.05 0.10

NOTES1 Carbon content over the maximum specified shall be increased by:

For plates over 12 mm up to and including 50 mm thick — 0.02% MaxFor plates over 50 mm thick — 0.05% Max

2 Nb and V may be added to Grade 1 and Grade 2, subject to mutual agreement between purchaser and supplier.3 When the steel is aluminium killed, the total aluminium content shall not be less than 0.02 percent. When the steel issilicon killed, silicon content shall not be less than 0.10 percent. When the steel is silicon-aluminium killed, the siliconshall not be less than 0.03 percent and total aluminium content shall not be less than 0.01 percent.4 Nitrogen content of steel shall not exceed 0.012 percent which shall be ensured by the manufacturer by occasionalcheck analysis.5 Closer limits of composition may be agreed to between the supplier and the purchaser.

Table 2 Permissible Variation in Product Analysis

Constituent Variation Over the Specified Maximum or

Under the Minimum Limit, Percent

(1) (2)

CarbonUp to and including 0.23%

Over 0.23%0.020.03

Silicon 0.02

Manganese 0.05

Phosphorus 0.005

Sulphur 0.005

Niobium 0.01

Vanadium 0.02

IS 2041 : 1995

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9.2 Width

9.2.1 The values for the permissible deviationfrom the nominal width for plates with shearededges shall not exceed the limits stated inTable 4.

9.2.2 In case of plates with mill edges and withgas cut edges, the permissible deviation inwidth must be agreed on ordering.

9.3 Length

9.3.1 The values for the permissible upperdeviation from the nominal length for plateswith sheared edges shall not exceed the limitsstated in Table 5.

9.3.2 For plates with mill edges and with gascut edges, the permissible deviations in lengthmust be agreed on ordering.

9.4 Straightness of the Longitudinal Edge and Squareness

Every plate supplied must contain onerectangle of the nominal dimensions orderedfor the width and length.

9.5 Flatness

9.5.1 Permissible deviation from flatness shallbe as given in Table 6.

9.5.2 The deviations from flatness must bemeasured at a distance of at least 25 mm fromthe longitudinal edges and at least 200 mmfrom the ends of the plate.

10 THEORETICAL MASS

A density of 7.85 g/cm3 shall be taken for thedetermination of the theoretical mass of plate.

Table 3 Tolerances on the Nominal Thickness of Plate( Clause 9.1.2 )

Nominal Thickness Tolerance Above Nominal Thickness onDifferent Width Range (mm) of Plate

Overmm

Up to and includingmm Up to and

Including2 200 mm

Over 2 200up to and Including

2 500 mm

Over 2500 mm

(1) (2) (3) (4) (5)

— 20 0.8 0.9 1.1

20 25 1.0 1.1 1.2

25 30 1.2 1.4 1.5

30 40 1.6 1.8 2.0

40 50 2.0 2.3 2.5

50 70 2.6 3.0 3.3

70 100 3.3 3.5 3.8

NOTE — Thickness shall be measured at a location not less than 25 mm from the plate edges.

Table 4 Tolerances on the Nominal Widthof Plates with Sheared Edges

( Clause 9.2.1 )All dimensions in millimetres.

Nominal Width Tolerance on the Nominal Width

Over Up to and Including Plus Minus

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

— 1 500 16 6

1 500 2 000 20 6

2 000 2 500 22 6

2 500 — 25 6

Table 5 Tolerances on the Nominal Length of Plates

( Clause 9.3.1 )All dimensions in millimetres.

Nominal Length Tolerance on the Nominal Length

Over Up to and including Plus Minus

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

— 4 000 20 6

1 000 6 000 25 6

6 000 8 000 35 6

8 000 10 000 40 6

10 000 15 000 45 6

15 000 — 50 6

IS 2041 : 1995

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Table 6 Permissible Deviation from Flatness

( Clause 9.6.1 )All dimensions in millimetres.

11 MECHANICAL PROPERTIES

11.1 Tensile Test

11.1.1 Number of TestsOne tensile test shall be taken from each plateas rolled. When plates are produced from coils,three tensile tests shall be made from each coil.

11.1.2 Orientation of Test SampleThe longitudinal axis of the tensile test sampleshall be perpendicular to the final rollingdirection of the plate.

11.1.3 Location of Test SampleThe tensile test sample shall be taken at adistance of one-fourth of the total width of platefrom one longitudinal edge of the plate. In thecase of plates produced from coils, first sampleshall be taken from prior to the first plate,second from approximately central lap of thecoil and third from end of the last plate.

11.1.4 When heat-treatment is specified, thetest sample shall be taken from the plate in theheat treated condition or from full thicknesstest samples simultaneously heat treated withthe plate.11.1.5 Test sample shall be prepared inaccordance with IS 1608 : 1995.

11.1.6 Tensile Test Result

11.1.6.1 The tensile test shall be carried out inaccordance with IS 1608 : 1995, generally usinga proportional gauge lengthLo = 5.65 where So is the cross sectionalarea of the test piece. Test pieces with a nonproportional gauge length may be used; in thiscase the elongation values shall be converted inaccordance with IS 3808 (Part 1) : 1989. Thetensile strength, yield stress and percentageelongation shall be as given in Table 7.

Table 7 Mechanical Properties

11.1.6.2 In case of plates from coil, all materialbetween any two test locations that meet therequirement is acceptable.11.1.6.3 Should a tensile test piece break outside the middle half of its gauge length and ifthe percentage elongation is less than thespecified minimum, the test may be discardedat the suppliers option and a fresh testconducted from the same plate.11.2 Bend Test

11.2.1 One bend test sample shall be takenfrom each plate as rolled or from each coil.Orientation and location shall be same as fortensile tests.11.2.2 Bend test shall be conducted inaccordance with IS 1599 : 1985. The test piece,shall withstand, without fracture or crackingbeing bend over 180° against mandrel ofdiameter three times the thickness of testsample.11.3 Low Temperature Charpy Impact Test (V-notch Tests)

11.3.1 Charpy impact test shall be conducted ifor as agreed to at time of ordering.11.3.2 Number of TestsOne impact test (3 samples) shall be made fromeach plate as rolled. When plates are suppliedfrom coils, the number of impact test requiredshall be the same as the number for tensiletest.11.3.3 OrientationThe longitudinal axis of the samples shall beoriented parallel to the final direction of rolling.Notch axis shall be perpendicular to the rolledsurface.11.3.4 When heat-treatment is specified thetest sample shall be taken from the plate inheat treated condition or from full thicknesstest samples simultaneously heat treated withthe plate.11.3.5 The average impact test values of threetest samples lying next to one another in thetest sample, when tested in accordance withIS 1757 : 1988, at a temperature of –10°C forgrades 1 and 2, and –20°C for grade 3 shall not

Nominal Thickness Permissible Deviation from Flatness Measured on 1000 mm

of Plate Surface in AnyDirectionOver Up to and

Including

(1) (2) (3)

— 5 9

5 8 8

8 25 7

25 40 6

40 — 7

So

Grade Yield Stress, MPa, Min

Tensile Strength,

MPa

Elongation Percent on Gauge Length

5.65 , Min

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

1 220 415-550 21

2 260 490-620 21

3 355 490-640 21

So

IS 2041 : 1995

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be less than 27 joules. Any individual valuemay be below the specified minimum but shallnot be less than 75 percent of that value.11.3.5.1 Any other test temperature andminimum impact value can be agreed to at thetime of ordering.11.4 Retests

11.4.1 Should any one of the test samples firstselected, fail to pass any of the tests specified inthis standard, two further samples shall beselected for testing in respect of each failure.Retest samples shall be drawn from the sameplate from which the original test had beendrawn. If the test pieces from either of thesesamples fail the material represented by thetest samples shall be rejected.11.5 Re-heat Treatment

If any heat treated material fails to meet themechanical requirements specified, thesupplier may re-heat treat the material and inthat case, all mechanical properties shall bere-evaluated.

12 NON DESTRUCTIVE TESTS

Ultrasonic testing of plates as perIS 11630 : 1986 may be carried out as permutual agreement at the time of ordering. Theacceptance standard shall be specified by thepurchaser.

13 RUST PROTECTION

After inspection and approval, if so desired bythe purchaser, each plate shall be painted withone coat of boiler linseed oil or a suitable rustpreventive material, as agreed to between thesupplier and the purchaser.

14 MARKING

14.1 For plates 6 mm and over in thickness, thename or trade mark of the manufacturer, castnumber, grade and plate number shall belegibly steel die stamped on each finished plateat 150 mm from one of the transverse edges atthe middle.14.2 For plates under 6 mm in thickness, themarking specified in 14.1 shall be legiblystenciled instead of stamping.

14.3 BIS Certification Marking

The material may also be marked with theStandard Mark.

14.3.1 The use of the Standard Mark isgoverned by the provisions of the Bureau ofIndian Standards Act, 1986 and the Rules andRegulations made thereunder. The details ofconditions under which the licence for the useof the Standard Mark may be granted tomanufacturers or producers may be obtainedfrom the Bureau of Indian Standards.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates that nochanges are needed; if the review indicates that changes are needed, it is taken up for revision. Users ofIndian Standards should ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of ‘BIS Catalogue’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Doc : No. MTD 4 (4049)

Amendments Issued Since Publication

Amend No. Date of Issue

Amd. No. 1 October 1997

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