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IS0
I NTERN AT I O N A L O RG A N 1Z AT I O N FOR STA N DARD I ZATl ON
IS0 RECOMMENDATION
R 630
STRUCTURAL STEELS
1st EDITION
November 1967
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
of that country, being
by the national standards organization
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 630, Structural Steels, was drawn up by Technical Committee
ISO/TC 17, Steel, the Secretariat of which is held by the British Standards Institution (BSI).
Work on this question by the Technical Committee began in 1957 and led, in 1965, to the
adoption of a Draft IS0 Recommendation.
In February 1966, this Draft IS0 Recommendation (No. 918) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies :
Australia India Spain
Japan Sweden
Austria
Belgium Korea, Rep. of Switzerland
Canada New Zealand Turkey
Norway
Chile U.A.R.
Poland United Kingdom
Czecoslovakia
Denmark Portugal U.S.S.R.
France Republic Yugoslavia
Germany of South Africa
Hungary Romania
Two Member Bodies opposed the approval of the Draft:
Italy
Netherlands
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in November 1967, to accept it as an IS0 RECOMMENDATION.
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IÇO/R 630 - 1967 (E)
IS0 Recommendation R 630 November 1967
STRUCTURAL STEELS
1. SCOPE
This IS0 Recommendation applies to heavy and medium plates (3 mm and over), wide flats, bars
and hot-rolled sections, generally used in the delivery condition and normally intended for bolted,
riveted or welded structures (see Annex). Table 1 shows which are the grades and qualities co-
vered by this IS0 Recommendation and Table 2, their relevant chemical composition and mechan-
ical properties.
This IS0 Recommendation does not cover steels intended for boilers or pressure vessels.
TABLE 1. - Grades and qualities
I
Qualities
Grades
Fe 33
Fe 37 X
Fe 42 X X X X
Fe 44 X X
Fe 52
TABLE 2. - Chemical composition and mechanical properties
Chemical
Tensile properties Impact test
composition
__
at
Bend
Grades lualitie!
imbien
at
test
at
:emper -20”
Ladle A%
ooc
***
ature
**
Fe 33 O X X
~~ ~~
X X X
Fe 37 A X
X X X X
B X
X
C X X X X
X X
D X X X
. ~~~~~ .
X X X
Fe 42 A X
X X X X
B X
X
C X X X X
X X X
D X X
. ~
- . __
X X X
Fe 44 A X X
B X X X X X X
C X X X X X
X X X
D X X X
~
B X X X X X X
Fe 52 X
C X X X X X X
X
D X X X X X X
-
-
~~
* Verifications of the chemical composition on the product are not carried out unless specified on the order.
** For quality B steels, the impact value need be determined only if required by the order.
*** By agreement between the producer and the purchaser, the impact value of 2.8 kgf.m fixed for the V-notch test piece
can be verified at temperatures below -20 “C and down to -50 “C.
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ISO/R 630 - 1967 (E)
, ,
2. CHARACTERISTICS OF GRADES AND QUALITIES
2.1 Chemical composition
2.1.1 Ladle analysis. The composition limits for analysis carried out on the ladle sample are
given in Table 3 and are maximum values.
2.1.2 Product analysis. This analysis can be requested by the purchaser, in which case it
should be specified on the order. The composition limits are given in Table 3 and are
maximum values.
The analysis is carried out on a sample for chemical analysis taken from the test pieces
used for the verification of the mechanical properties-or from a corresponding location
-and over the whole thickness of the product (see diagrams in section A.3 of Annex).
TABLE 3. - Chemical composition
Cmax. % Pmax. % S max. %
__-
Grades
Ladle Product Ladle Product Ladle Product
Fe 33 O
Fe 37 A 0.25 o. 100
0.20 0.08 0.06 0.075
B* 0.25 0.06 0.075 0.05 0.062
0.20
C 0.17 0.20 0.05 0.055 0.05 0.055
D
0.17 0.20 0.045 0.050 0.045 0.050
A 0.100
Fe 42 0.25 0.31 0.08 0.06 0.075
B* 0.27 0.06 0.075 0.05
0.22 0.062
C 0.20 0.23 0.05 0.055 0.05 0.055
D
0.20 0.23 0.045 0.050 0.045 0.050
A
Fe 44 0.25 0.31 0.08 0.100 0.06 0.075
B* 0.22 0.27 0.06 0.075 0.05
0.062
C 0.20 0.23 0.05 0.055 0.05 0.055
D 0.20 0.23 0.045 0.050 0.045 0.050
Fe 52 B 0.22 0.25 0.06 0.065 0.05 0.055
**
C 0.20 *# 0.23 *** 0.05 0.055 0.05 0.055
D 0.20 *# 0.23 *** 0.045 0.050 0.045 0.050
* In the case of steel other than rimming steel, the percentages on the product are as follows:
Fe 37-B C = 0.23 P = 0.065 S = 0.055
Fe 42-B C = 0.25 P = 0.065 S = 0.055
Fe 44-B C = 0.25 P = 0.065 S = 0.055
** Fe 52: The maximum ladle percentages of manganese and silicon are respectively
1.50 and 0.55
When the manganese content exceeds 1.5 % and is less than 1.65 % the formula C + y Q 0.45 may be applied
if stated on the order.
*** For products thicker than 16 nim, a maximum carbon content of 0.22 % for ladle analysis and 0.25 % for product
analysis is permitted.
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ISO/R 630 - lS7 (E)
2.2 Mechanical properties
The mechanical properties should be as stated in Table 4 when they are determined on test
pieces obtained according to the requirements of clause 4.4.
TABLE 4. - Mechanical properties
~~
Mechanical properties Impact test
180"
-4% (LE=
bend Energy
Re kgf/mm2, min. (l)
5.65\/S0)
Grades ig-
Type of test piece and test min.
Rm e)
min. (3
man- kgf.m
kgf/mm2 temperature
*
16 4ûce 40 ,< 16
a40 < 63
< 63 dia.
-
a***
52 max.
Fe 33 1 O
~-
-__ __ -__-
-
-
24 23 22 31 to 45 26 25 2a
V at ambient temp. (s) 2.8 **
24 23 22 31 to 45 26 25 2 a
24 22 31 to 45 Vat0"C 2.8 **
23 26 25 2a
24 23 22 31 to 45 26 V at -20 "C 2.8 **
25
244)
__
~__-~
-
-
A 26 25 24 42 to 50 23 22
Fe 42 3a
B 26 25 24 42 to 50 23 22 3 a V at ambient temp. (5) 2.8 **
VatO'C 2.8 **
C 26 25 24 42 to 50 23 22 3a
25 24 42 to 50 22 V at -20 "C 2.8 **
26 23
344)
~~
-
-
A 28 26 25 44 to 52 23 22
Fe 44 3a
2.8 **
B 28 26 25 44 to 52 23 22 V at ambient temp. (5)
3 a
2.8 **
C 28 26 25 44 to 52 23 22 3a VatO'C
D 21 26 44 to 52 23 22 Vat -20°C 2.8 **
29 3a
- -~ -
30< 30<
-630
r<50
e<50
__
2.8 **
Fe 52 B 36 35 34 50 to 62 22 21 3 a V at ambient temp.(5)
2.8 **
C 36 35 34 50 to 62 22 21 3a VatO'C
22 21 Vat -20°C 2.8 **
D 36 35 34 50 to 62 3a
* Average of values obtained on at least 3 test pieces and not more than 6 test pieces.
** A value of 2.8 kgf-m corresponds to an impact of 3.5 kgf.m/cm'.
*** a = thickness of the bend test piece.
(l) In qualities Fe 37-A and B, Fe 42-A and B and Fe 4.4-A and B, for plates and for flats wider than 400 mm, these
values can be reduced by 2 kgf/mm'. When, however, it is required in the order that the yield stress values shown for these
products in the table should be maintained, the upper limit of the range of tensile strength may be exceeded by 3 kgf/mme.
(') For transverse test pieces, for plates and for flats wider than 400 mm, these values may be reduced by 2 points.
(') For transverse test pieces, for plates and for flats wider than 400 mm, these values may be increased by 0.5 a except
for grade Fe 33-0.
(") For products up to and including 16 mm thickness, these values are reduced by 0.5 a in the case of grade Fe 37
and by 1 a in the case of grade Fe 42.
(") For quality B steels, the impact value need be determined only if stated on the order.
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ISO/R 630 - 1967 (E)
3. MANUFACTURE
3.1 Process of manufacture
The process of manufacture, except for qualities O and A, may be specified on the order after
agreement between the purchaser and the supplier.
When the process of manufacture is not stated on the order, it is left to the choice of the
producer; it should, however, be stated on his advice note to the purchaser (see Annex and
IS0 Recommendation R 404, General Technical Delivery Requirements for Steel).
3.2 Defects
Internal or surface defects not prejudicial to the uses or proper application of the product
should not be ground for rejection or claim.
3.2.1 Removal of surface defects
3.2.1.1 Less important defects can be removed by the producer by grinding, provided that
the thickness is not reduced locally by more than 4 % (with a maximum of 3 mm) in
relation to its nominal value. For reductions greater than 4%, but not exceeding
7 %, the agreement of the purchaser or his representative is necessary.
3.2.1.2 More important defects, that cannot be corrected by the method stated in clause
3.2.1.1 above, may, with the agreement of the purchaser or his representative, be
corrected by grinding or chipping followed by welding, subject to the following
conditions :
(a) after complete removal of the defect and before welding, the thickness should
20 % of its nominal value;
not have been reduced by more than
(b) the welding should be carried out by skilled welders and approved by the pur-
chaser, according to a procedure suited to the grade of steel and accepted by
the purchaser;
(c) the extra thickness of the weld metal should be removed by grinding.
In the case of flat products, if the repair by welding has been carried out on a rough
product in the “as rolled” condition, a normalizing treatment should be considered.
If the welding repair has been carried out on a product already normalized,
another normalizing treatment is always necessary.
4. INSPECTION REQUIREMENTS
Rolled products covered by this IS0 Recommendation should be the subject of a technical inspec-
tion which will involve only the verification of the chemical composition and mechanical pro-
It is not usual to require this for grade Fe 33-0. The verifica-
perties defined in Tables 3 and 4.
tions of chemical composition on the product and of the impact values at ambient temperature
(for rimming steel) are only carried out if required by the order.
4.1 Inspection unit
If inspection is required by the order, the inspection unit is drawn from the following:
(a) the batch *: all grades or qualities except qualities C and D; or
(b) the cast: all grades.
The method of batching should be stated on the order.
* A batch is defined as the product of one or several casts of similar quality and grade rolled into one class of product
and submitted for inspection at the same time.
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lSO/R 630 - 1967 (E)
The inspection un
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