S 8500
1991
( Reaffirmed 1995 )
_FTT
@%ml )
Indian S tand ta nd ar
.
STRUCTURAL STEEL-MICROALLOYED (MEDIUM AND HIGH STRENGTH QUALITIES) SPECIFICATION irst
UDC
vision vision
669*14*018*29
Wrought
Steel Products
Sectional
Committee,
MTD
FOREWORD This standard is one of a series of standards being issued for implementation of BIS Steel Economy Programme. These steel are specific class of steel in which enhanced mechanical properties are obtained by the incorporation of low proportions of one or more alloying elements. These steels are generally intended for applications where saving in mass may be effected by reason of their greater yield strengths. The manufacturer appropriate. This standard -made:
is allowed full
was originally
freedom
published
in the
selection
of alloying
in 1977. In this revision
elements
the following
he considers
changes have been
a)
Structural Steel ( Medium The title of the standard has been changed to “Microalloyed and High Strength Quality )” from “Weldable Structural Steel ( Medium and High Strength Quality )“.
b)
Steel Grade
Fe 640HT has been deleted.
cl Lower maximum limits for sulphur and phosphorous Provisions of IS 961 1975 are being be withdrawn subsequently
incorporated
for flat product in this
standard.
have been envisaged. IS 961
1975 would
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 1960 ‘Rules for rounding off numerical values The revised )‘. number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
IS 8500 : 1991
Indian Standard STRU CTURAL STE L - MICROALLOY ( MEDIU M ND IGH STRENGTH QUALITIE S ) SPECIFICATION
First Revision )
This standard covers the requirements of microalloyed steels of different strength levels for use in structural work. The steels may be suitable for other application also. 2 REFERENCES The Indian Standard listed below are necessary adjuncts to this standard: Title
IS No.
Methods of chemical analysis of steels ( issued in parts
22
Method
for bend
test
1599
1985
1608
1972
Method for tensile testing of (first revision ) steel products
1757
1988
Method for beam impact test first ( V-notch ) on steel
revision )
second
revision ) 1852
1985
Steel shall be as mutually agreed the manufacturer. guarantee, shall bc tion only. 4.1.1
1 SCOPE
Rolling and cutting
tolerances
supplied semikilled or killed between the purchaser and However, steels with impact supplied in the killed condi-
4.1.2 The steel shall be supplied in the as-rolled or normalized condition. 5 GRADE There shall be ten grades and 2. 6 FREEDOM
FROM
as
given
in Tables
DEFECTS
6.1 All finished stee1 shall be well and cIeanIy roIIed to the dimensions, sections and masses specified. The finished material shall be free from surface defects, such as pits, rolled in scaIes, deep scratches, grooves, laminations, cracks, rough jagged and imperfect edges, and any other harmful defects. 6.
Minor
surface
defects
may
be
removed
by
IS
8500:1991
Table
Chemical Composition
( Clauses 5.1, 7.1 an
7.2)
Ladle Analysis, Percentage r______--_---_--~_--__-________~-____-~ S* P* Si Mn (MUX) (MUX) (MUX) (Max) (Max)
Grade**
CarbonEquivalent (CE) Max
Fe440
.20
1.30
.050 --*040
*050 -040
-45
.40
Fe440B
?20
1.30
.050 .040
.050 m
.45
40
Fe490
.20
1.50
a050 -,040
.050 UO
.45
.42
Fe49OB
.20
I.50
*050 -~~ -040
a050 -,040
.45
.42
Fe540
.20
1.60
-045 -~ ,040
.045 .040
c45
.44
-Fe540B
.20
1.60
.045 __ .040
.045 ,040
.45
-44
Fe570
.22
1.60
.045 -~ .040
.45
.4h
Fe570B
.22
1.60
a045 --040
.045 .040
.45
.46
Fe590
.22
1.80
.045 .040
.045 .040
.45
*48
Fe59OB
-22
1.80
--.04.5 .040
.045 .040
.45
.311
Carbon ( based
Equivalent ( CE ) =C on ladle analysis)
SO45 *040
Mn, Cr + MO + V + Ni + Cu X8
15
NOTES Lower limit for carbon equivalent may be mutually agreed to between the purchaser and the manufacturer. 2 Microalloying elements like Nb, V, Ti and B shall be added singly or in combination. Total microalloying elements shall not be more than 0.25 percent.
IS 8500 Table 2
-1991
Mechanical Properties Clause 8.3.)
Grade
**
Tensile Strength (Mill)
Yield Strength ( M i n ) C--__--h-__-_~ 16-40 41-63 <6
mm
MPa
MPa
mm
>63
mm
mm
MPa
MPa
MPa
Elongation Percent @fin)
Bend (Internal Diameter)
Charpy V-notch Impact Toughness, Joules, Mb-z, ( Average of 3 Values ) Room Temp*-20%
Min***
5.65v’So
mm
12-25
mm
22
2t
3t
,,
22
2t
3t
50
30
320
,,
22
330
320
,,
22
3t 3t
50
25
390
380
,*
20
2t 2t 2t
410
390
380
,,
20
420 420
20 20
2t
3t
430
420
,,
20
2t
3t
45 -
20
590
450 450
430
,, ,,
3t 3t
25
430
2t 2t
50
450
590
450
430
420
9,
20
2t
3t
45
20
Mn/ma=O.lOZ
kgf/mma.
Fe440
440
300
290
280
Fe440B
440
300
290
280
Fe490
490
350
330
Fe490B
490
Fe540
540
350 410
Fe540B
540
Fe570 Fe570B
570
Fe590 Fe590B
570
By agreement
3t
NOTES 1 IMPa=
N/mms-1
2 Higher impact
values
will be subject
3 No individual
impact
value shall be less than 30 percent
4 For thickness
to mutual
agreement. of the minimum
specified
be agreed
between
average
value.
more than 25 mm, bend test not required.
5 The requirements manufacturer.
more
stringent
than
* Room Temperature 25+2C; of steel, Part ** Code for designation revisio/l ) *** is the thickness of the test piece.
those
1 based
above
on
7.2 Product Analysis
The product analysis shall be carried out on the finished product from the standard position. Permissible variation in case of such product
may
letter
symbol
(Refer
the
purchaser
IS 1762 [ Part
1
and
the
1974 (first
specified limits, unless otherwise agreed to between purchaser and manufacturer, two samples shall be taken on di.cerent pieces from same cast. Should the two analysis satisfy the requirement, the lot represented shall be accepted,
IS 8500 : 1991
Test samples shall not annealed or otherwise subjected to heat treatment unless the material from which they are cut is similarly treated, in which-case the test samples shall be similarly and simultaneously treated with the material before testing. Any slight straightening of test samples which may be required shall be done cold.
8.3 In case of Hat test samples for tensile test, both surfaces are normally to be left on the test samples for plates up to 32 mm thick. At least one rolled surface shall be left on rectangular test samples taken from plates exceeding 32 mm in thickness. Round test samples are permitted, but should only be adopted for thickness exceeding 27 mm.
8.10
8.4 In case of flats up to 16 mm thick, the test sample shall undergo, if possible, no machining whatsoever, prior to use as a test piece. Tf this is not possible, the test samples shall undergo the minimum amount of machining.
9 TENSILE
8.5 Bars below 28 mm may be tested without machining. In case of bars having diameters or thickness between 28 mm and 71 mm, the bars may be symmetricaIly reduced by machining. For bars having diameters or thickness exceeding 71 mm, the test sample may be taken from the position shown in Fig. 1. 8.6 In case of sections, flats, and pIates bend tests shall be carried out on rectangular .test samples which, as far as possible, should be of the full thickness of the product. In case of sections, flats and plates exceeding 28 mm in thickness, it is permissible to remove metal from one side of the test sample before using it as a test piece. The rolIed surface of the test piece shall be on the outer side of the bend during the test. 8.7 Before test samples are collected, full particulars regarding cast number, size and mass of plates, sections, flats and bars in each cast shall be furnished by the manufacturer to the purchaser. In case of plates, the number of plates in each cast shall also be given.
TEST
9.1 Number of Tensile
Test
9.1.1 Plat es, Secti ons ( Angles, Channels, etc, and lat s )
Tees,
Beams,
One tensile test shall be made from finished steel for every 40 tonnes or part thereof rolled continuously from each cast, a separate test being made for each class of steel product ( namely, plates sections and flats ) rolled from a cast. 9.1.2
than cast, from each
Where plates, sections or flats of more one thickness are rolled from the same one additional tensile test shall be made the material in each class of product for variation in thickness of 6 mm.
9.1.3
Bars ( Roun d, Square
and Hexagonal
One tensile test shall be made from finished product for each 40 tonnes or part thereof. If more than one diameter or thickness of the bar is processed, one additional tensile test shall be made for each variation of 3 mm above or below the diameter or thickness of the bar ordered. 9.2 Tensile Test Pieces The tensile strength, yield strength and percentage elongation of steel shall be determined from standard test-pieces cut rolling or trans-
IS 8500
1991
Is 8500 : 1991 9.3.1 In case of sections the thickness of which is not uniform throughout the profile, the limits shall be applied according to the actual maximum thickness of the piece selected for testing.
10.3.1 For bend test, the test piece at room temperature shall withstand bending through 180” to an internal diameter not greater than that given in Table 2 without showing any crack on the outer surface.
9.3.2 Should a tensile test piece break outside the middle half of the its gauge length ( see IS and percentage elongation 1608 1972 ) obtained is less than specified, the test may be discarded at the manufacturer’s option, and another test made from the sample plate, section, Aat or bar.
11 IMPACT TEST
10 BEND TEST
Bend test shall be 10.1 Number of Bend Test The made from finished steel from each cast. 20 or part thereof, rolled continuously, shall be as given below. One additional test shall be made for each class of product and for each variation in thickness. Class of Steel Product
No. of Be&Tests
Sections
in rolling direction for each type
Plates
transverse direction
to rolling
in rolling
direction
Plats and bars ( round, square, hexagonal, etc 10.2 Bend Test Piece
The test pieces shall be cut transverse to rolling direction from plates, and in rolling direction from sections, flats and bars. When sections permit, these shall be not less than 40 mm wide.
11.1 The impact test shall normally be carried out on products having a thickness/diameter greater than or equal to 12 mm. The test piece shall be so machined that the face closer to the rolling surface is not more than 1 mm from it; the notch axis shall be perpendicular to the rolled surface.
11.1.1 If stated in the order, impact test may be carried out on products having a thickness less than 12 mm; the dimensions of the test pieces shall be in conformity with IS 1757 1988. 11.2 This test is carried out using a V-notch test piece ( see IS 1757 1978 ), the value for consideration being the arithmetic mean of the results obtained on three test pieces taken side by side from the same product. 11.3 The test samples thickest product.
shall be taken
from the
11.3.1 A test sample shall be taken from each 40 tonnes or part thereof from the same cast. 11.4 If the average value of the three Charpy impact tests fails to comply by an amount not exceeding 15 percent of the specified minimum average value, three additional test pieces from the same sample shall be tested and the results added to those previously obtained and a new average calculated. Provided this new average complies with the specified requirement, the
Is 8500 : 1991 Table 3 Indian Standards Which Give Nominal Dimensions of Rolled Steel Products
Relevant Indian Standard
Product Beam channel angle section Tee
and
IS 1173 tee bars
bars
Bulb angles Plates, strip
IS 808 1989 Dimensions for hot rolled steel beam, column channel and angle sections revised )
sheets
and
1978 Hot rolled
steel
IS 1252 1958 Rolled bulb angles
steel sections
IS 1730 Dimensions sheet and strip for general engineering
for steel plate structural and purposes
IS
: 1974
1730
(Part
I)
IS 1730
( Part
II)
(first
(first
revision )
revision
yfi;;3;evAiz;r; Flats
slit
second revision )
)
1974
III
1974
Plates Sheet Strip
and square
Should any one of the test pieces first selected fail to pass any of the tests specified in this standard, two further samples shall be selected Should for testing in respect of each failure. the test pieces from both these additional samples pass, the material represented by the test sampIes shall be deemed to comply with the requirements of that particular test. ShouId the test .pieces from either of these additiona samples fail, the material represented by the test samples shall be considered as not having complied with this standard. 16 CALCULATION
OF MASS
IS 1732 1971 Dimensions for round and square steel bars for structural and general engineering purposes (first revision
17 MARKING
IS 1863 1979 Rolled flats (first revision )
Sheet, piling section
IS
1986 Steel sheet ( jirst revision )
piling
Channel
IS 3954 1966 Hot rolled channel sections for general neering purposes
steel engi-
Track shoe sections
15 RETEST
The mass of steel pIates section, flats and bars shalI be calculated on the basis that stee1 weighs 7.85 g/cm3.
Bulb flats
sections
Unless otherwise agreed between the purchaser and the manufacturer the rolling and cutting tolerances for steel products conforming to this standard shall be those specified in IS 1852 1985.
IS 1731 : 1971 Dimensions for steel flats for structural and general engineering purposes (first revisiort )
&nyd
14 TOLERANCES
2314
sections
IS 10182 (Part 1 sions and tolerances track shoe sections: TS-Ll IS 10182 ( Part 2
steel
bulb
1982 Dimenfor hot-rolled Part 1 Section 1985 Dimen-
with the ~exception of 17.1 Each product, round, square and hexagonal bars and flats, shall carry a tag or be marked with the manufacturer’s name or trade-mark. Designation of steel should also be similarIy marked on the product or tag. 17.2 Every heav~y and medium structural mill product and each plate of thickness 10 mm and over shall be marked with the cast number. In case of plates below 10 mm thickness, the top plate of each pile ( which may consist of approximately 16 plates ) shah be marked with cast number and the remaining plates have suitable identification marking.
INDIAN STANDARDS ON STRUCTURAL
STEELS
Title
IS No.
226
1975
Structural
steel ( standard
quality
)
1977
1975
Structural
steel ( ordinary
quality
) ( second revision )
2062
1984
Structural
steel ( fusion welding quality
2830
1975
Carbon steel billets, blooms and (first revisio n ( standard quality
slabs for
2831
1975
Cabon steel billets, ( ordinary quality )
slabs
blooms
and
jfth
second revision )
revision )
)
second revision )
for
re-rolling re-rolling
into into
structural
steel
structural
steel
3039 : 1988
Structural
6914
1978
Carbon steel cast billet ingots and continuously structural steel ( standard quality ) (first revisi on
cast
billets for
rolling
into
6915
1978
Carbon steel cast billet ingots and continuously structural steel ( ordinary quality ) (first revisi on
cast
billets for
rolling
into
steel ( shipbuilding
quality~) (first
revisi on
Bureau of Indian
tand ards
BIS is a statutory institution established under the Bureau of Indian Standards promote harmonious development of the activities of standardization, marking certification of goods and attending to connected matters in the country.
Act, 1986 to and quality
Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type Director Enquiries relating to copyright be addressed to the or grade designations. Publications ), BIS. Revision of Indian Standards Indian Standards are reviewed periodically and revised, when necessary and ~amendments, if any, are issued from time to time. Users of Indian Standards should ascertain that they are in on this Indian Standard may be possession of the latest amendments or edition. Comments sent to BIS giving the following reference: Dot : No. MTD 4 ( 3692
Amendments Issued Since Publication Date of Issue
Amend No.
BUREAU
OF INDIAN
Text Affected
STANDARDS
Headquarters Man&
Bhavan, 9 Bahadur
Shah Zafar Marg,
New Delhi
110002
AMENDMENT
NO. 3 OCTOBER 199 TO IS 8500 : 1991 STRUCTURAL STEEL MICROALLOYED ( MEDIUM AND HIGH STRENGTH QUALITIES ) - SPECIFICATION (First Revision)
.-
( Pogc~ 1, cltr~rse 2 ) Tcnsilc tcstiug (second
Substitute ‘1608 1995 Mechanical revision)’ for ‘1608 1972 Method
testing of nlc~al for tensile testing
AMENDMENT
NO. 3 OCTOBER 199 TO IS 8500 : 1991 STRUCTURAL STEEL MICROALLOYED ( MEDIUM AND HIGH STRENGTH QUALITIES ) - SPECIFICATION (First Revision) 1995 Mechanical ( Pogc~ 1, cltr~rse 2 ) - Substitute ‘1608 .- Tcnsilc tcstiug (second revision)’ for ‘1608 1972 Method of steel products (firsl revision )‘.
testing of nlc~al for tensile testing
‘Mechanical Page 3, lilO/e 2, Cnpion ‘Clirrrses 9.3, 10.3.1 nnd 11.4’for ‘Clnrrse 8.3’.
)
Page 4, clcrrrsc 9.2, fines 1608 1972’.
and 8 ) -
Pngc 4, cltrrrse 9.3, line 3 ) -
Properties
Substitute
Substitute
‘IS 1608
‘IS 1608
Substitute 1995’ jbr ‘IS
1995’ for ‘IS 1608
1972’. (Page
6, clarm
11.4 ) -
Insert the following
at the beginning
‘The material reprcsenkd shall be deemed to comply average value of 3 lest spccimcns meet the requirements
of para:
with the standard if the given in Table 2.’
TO QUALITIES)
SPECIFICATIO
(FbstRevkwn) he
Note Hi he
ue
Page
69.1.1
(MTD4)
pe
us
re
o f m pa c t ou gb n
te ti
Substi ut he fo lo
bj
t o m u tu a l a gr e m en t .
ng or th
xist ng
TO
IMnensions’
(MTD4)
