IS 7283: Hot rolled bars for production of bright bars and machined parts for enginner ing applications

10 Pages·1992·1.1 MB·English

by  Bureau of Indian Standards

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IS 7283 (1992): Hot rolled bars for production of bright
bars and machined parts for enginner ing applications [MTD
4: Wrought Steel Products]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
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“Knowledge is such a treasure which cannot be stolen”

( TTpS cFm?JT )
u
Indian Standard
HOT-ROLLEDBARSFORTHEPRODUCTIONOF
BRIGHTBARSANDMACHINEDPARTSFOR
ENGINEERING APPLICATIONS-
SPECIFICATION
( First Revision )
UDG 669*14-422-122.4

@ BIS 1992
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG .
NEW DELHI 110002
January 1992 Price Group 2
Wrought Steel Products Sectional Committee, MTD 4; and Steel Bars Subcommittee, MTD 4 : 4
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 1974. Keeping in view the requirements laid down in IS 9550 : 1980
‘Bright bars’, the rolling tolerances has been narrowed down. Provision for decarburization and macroetch
test has been included.
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
secalp retained in the rounded off value should be the same as that of the specified value in this standard.
\,*
‘*
:I
IS 7283 I 1992
Indian Standard
HOT-ROLLED BARS FOR THE PRODUCTION OF
BRIGHT BARS AND MACHINED PARTS FOR
ENGINEERING APPLICATIONS -
onr2flTrmriA
TTAnT
3rDLlrlLA IlUlV
First Revision )
(
1 SCOPE or normalised
1.1
This standard covers the requirements of hot- or annealed condition,
rolled bars for the production of bright bars by
,C) Surface quality,
cold drawing, turning or grinding or a combina-
tion of these processes and also for the production d) G rain size,
of machined parts for the engineering application. e) Hardenability,
i.i.i This standard does not cover the require- f ) Inclusion content, and
ments for special steels including tool steels,-ball
g) Others ( as agreed upon at the time of
bearing steels, spring.st.eels and silver steel.
inquiry and order ).
2 REFERENCES
The following Indian standards are the necessary 4 MANUFACTURE
, 1
adjuncts to this standard:
1.4 Steel shall be manufactured by any process
T..p Nn e!tiT
A” Y .“. except the bessemer process. it may be foiiowed
9373 1987 Dimensional tolerances for by secondary refining or vacuum melting. Steel
:
carbon and alloy constructional shall be supplied se\mi-killed or killed.
steel products ( f;rst) revision )
3848: 1981 Method for end quench test 4.2 Steel bars may. be rolled from ingots, billets
for hardenability of steel or continuously cast billets. In case of ingots,
($rst revision ) sufficient discard shall be made to ensure free-
A,_ A.,,_ _:,:__ ___.._L-rf__ _-_I -rl- _.. ,___~~~l~l
U”Lll 11”lll p,lJn,g, seglcga~lon anu airier narmnu
4163 : 1982 Method for determination of
defects.
inclusion content in steel by
macroscopic method (@sft
4.3 The size of the ingots, billets or continuously
revision )
billets for a given*size of the finished product shall
~1-.-~- P- -. --r’---_L*.--.
lvletnoas ror esumarmg ave- ‘be such that the minimum reduction ratio of i6 : i

rage grain size of metals (first in case of ingots and billets, and 8 : 1 in case of
revision ) continuously cast billets; from the minimnrn cross
6396: 1983 Method of measuring decar- sectional area of the ingot, billets or continuously
burized depth of steel (first cast billet to the maximum cross sectional area of
revision ) the product is ensured. However, the reduction
:1978 ratio other than that specified may be agreed,
8910 General technical delivery n..h:ar+ .r\ thn ,..t..ol nmm..,.mz.rr+
riU”JvA I” CA&L. lllULU.sl as, C~;111~‘1\ be:ween the
requirements for steel and
purchaser and the manufacturer.
steel products
9550:
1980 Bright bars 4.4 The hot-rolled bars should be processed cast-
wise and despatched accordingly.
3 SUPPLY OF MATERIAL
3.1 General requirements relating to the supply 5 MATERIAL
of material shall conform to IS 8910 : 1978.
5.1 The chemistry of the material shall conform
3.2 Subject to the agreement between the pur-
chaser and the manufacturer steel covered in this to that of any steel of the Indian Standards
standard shall be ordered and delivered to any one Specification or as mutually agreed upon between
the manufacturer and the purchaser.
or a combination of the following characteristics:
a) Chemical composition, 5.2 Free cutting steels either sulphurised or leaded
b) Mechanical properties in: may be supplied by mutual agreement between
a-_s _ro_1,,1_c_uI +LULG, epum .,.-LhU-cc,,z JG;I 4..1_A,u CLLU-G mIIIeam~I.L.CLoIcr+L.~xcruaIr LA.
1
\:+
rs t
3827 299f
NOTES Examples of typical sizes are as given below:
1 Lead analysis shall be done from product sample
Bars : 14, 15, 16, 17, 18, 19, 20, 21, 23, 27,
only, since it is not possible to have laddle sample
analysiifor lead. 30, 33.5, 38, 40, 42, 45, 47, 53, 60 and
2 Sulphur or lead should be uniformly distributed in 67 mm diameter.
the cross-section of the product.
Coils : 5.5, 6.0, 7.0, 8.0, 9.0, 10.0, 12’0, 14.0,
6 FREEDOM FROM DEFECTS 16.0, 18.0, 20.0, 22.0 and 23.0 mm
diameter.
6.1 The bars shall be rolled to dimensions speci-
fied. The finished material shall be reasonably 7.1.1 Hot-rolled round bars and coils of other
free from cracks, surface flaws, laminations and sizes may also be supplied as agreed to between
other harmful defects. Unless otherwise agreed the purchaser and the manufacturer.
between the purchaser and the manufacturer, the
permissible limits shall be as specified, in Table 1. 7.2 Dimensional Tolerances
6.1.1 The hot-roiled bars should be suitably 7.2.1 The dimensional tolerances shall be in
tested for cracks and other surface defect along accordance with IS 3739 : 1987 for round, square
with the guarantee certificate. and hexagonal bars. Tolerance grade is to be
agreed between the manufacturer and the pur-
6.2 Sulphide inclusion, and segregation bands
chaser.
which are characteristics of free cutting steel shall
not be considered as defects in the material. 7.3 All bars shall be supplied with their ends
sheared or saw cut.
6.3 Test specimens representative of the cross
section of the material shall be pickled in hydro- 7.3.1 Unless otherwise agreed, the length of the
chloric acid 1 : 1 at a temperature 70 to 80°C. bars shall be 3-6.5 metres or in multiples with
The specimens after macroetch shall be free from maximum of IO percent short down to l-5 metres.
pipe, excessive porosity, harmful segregation,
7.3.2 Cutting and Shearing Tolerances
internal cracks and macro inclusions.
The tolerances shall not exceed limits given below
Table 1 Permissible Depth of the Surface for the ordered in exact length:
Defects for Black Bars
Nominal Size, mm Pwnissible Deviation, mm
( Cluu~s 6.1 )
up to 50
Dimensions, mm Depth of Defects, mm f ;”
C---_*----~ y----*------y
Over Up to and Grade Grade Crack Tested Over 50 + 150
including 1 2 ( Round, Squ- -0
are, Hexagon
and Blat )
8 DECARBURIZATION
(1) (2) (3) (4) (5)
6 8 0.13 0’26 Total depth of decarburization when tested as per
8 12 0’15 0’30 IS 6396 : 1983 for hot-rolled bars and coils shall
12 14 0’18 0.36 be 1.5 percent of the diameter per side and 2.0
14 20 0.25 6’50 By agreement percent in the annealed condition.
20 25 O-28 0’56 between the
25 32 0.30 0.60 purchaser and 9 INCLUSION RATING
32 42 0’35 0’60 the manufac-
If required by the purchaser the inclusion rating
42 53 040 0’80 turer
of the bar shall be determined in accordance with
53 63 0’60 1’20 IS 4163 : 1982. The limits for inclusion rating
63 80 0’80 1’60 shall be agreed to between the purchaser and
80 100 1.00 2’00 the manufacturer.
Above 100 mm By agreement
NOTES 10 HARDENABILITY
Grade 1 - recommended for drawing, turning and If required by the purchaser, steel may be order-
grinding. ed on the basis of end quenched hardenability
Grade 2 - recommended for the production of machined test in accordance with 1S 3848 : 1981. In that
parts for general engineering purposes. case specification requirements shall be mutually
agreed to.
7 DIMENSIONS
11 GRAIN SIZE
7.1 Hot-rolled steel bars shall be manufactured
to any of the sizes between 5 to 120 mm, as agreed The austenitic grain size, if specified, shall be
to between the manufacturer and the purchaser. tested in accordance with IS 4748 : 1968.
2
,*
‘:I
IS 7283 : 1992
-12 RETESTS e) Special requirements in regard to testing,
packing, despatching, etc; and
Should any one of the test pieces first select-
ed fail to pass any of the test specified in f) Also provisions of 3.2, if applicable,
this standard, two further samples shall be selected
from the same lot for testing in respect of each 14 MARRING
failure. Should the test pieces from both these
additional samples pass, the material represented 14.1 Each bar over 5Q mm in diameter or of
by the test samples, shall be deemed to comply equivalent cross sectional area shall be stamped or
with the requirements of that particular test. suitably marked at one end with the cast number
Should the test pieces &om either of these addi- or any other identification mark by which the
tional samples fail the material represented by the steel can be traced to the cast and heat treatment
test samples shall be deemed as not conforming batch from which it was made.
-to this standard.
14.1.1 Sizes below 50 mm diameter should be
13 BASIS FOR ORDER separately bundled.
While placing an order for the steels covered by 14.2 Bars of 50 mm diameter or equivalent cross
this standard, the purchaser should specify clearly section and below shall be bundled as agreed to
-the following: between’the purchaser and the manufacturer. The
metal tag attached to each bundle shall be marked
Steel grade;
as given in 13.1.
Surface quality ( Table 1 );
14.3 The material may be marked with the
Size;
Standard Mark. Details are available with the
Tests and test reports required; Bureau of Indian Standards.
Standard Mark
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Amendments lssoed Shce PPblicatioo
dnemA .oN Date of Issue Text Affected
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