ISO 9330-5:2000
(Main)Welded steel tubes for pressure purposes — Technical delivery conditions — Part 5: Submerged arc-welded unalloyed and alloyed steel tubes with specified low temperature properties
Welded steel tubes for pressure purposes — Technical delivery conditions — Part 5: Submerged arc-welded unalloyed and alloyed steel tubes with specified low temperature properties
This part of ISO 9330 specifies the technical delivery conditions for submerged arc-welded tubes of circular crosssection, made of unalloyed or alloyed steel with specified low temperature properties. These tubes are intended for pressure purposes in cases when the material is also used as part of a low temperature piping system. The requirements of appropriate international application standards and relevant national legal regulations shall be taken into account by the user. For pressure-containing equipment International Standard ISO 5730 is available. For the general technical delivery requirements, see ISO 404. NOTE The English words "tube" and "pipe" are synonymous.
Tubes en acier soudés pour service sous pression — Conditions techniques de livraison — Partie 5: Tubes soudés à l'arc immergé en aciers non alliés et alliés avec caractéristiques spécifiées à basse température
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 9330-5
First edition
2000-06-15
Welded steel tubes for pressure
purposes — Technical delivery
conditions —
Part 5:
Submerged arc-welded unalloyed
and alloyed steel tubes with specified
low temperature properties
Tubes en acier soudés pour service sous pression —
Conditions techniques de livraison —
Partie 5: Tubes soudés à l'arc immergé en aciers non alliés et alliés
avec caractéristiques spécifiées à basse température
Reference number
ISO 9330-5:2000(E)
©
ISO 2000
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ISO 9330-5:2000(E)
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ii © ISO 2000 – All rights reserved
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ISO 9330-5:2000(E)
Contents Page
Foreword.iv
1 Scope .1
2 Normative references .1
3 Symbols .2
4 Information to be supplied by the purchaser .3
5 Manufacturing process .4
6 Metallurgical properties .6
7 Dimensions, masses and tolerances.10
8 Technical delivery conditions .12
9 Inspection and testing.13
10 Samples .15
11 Test methods and results .17
12 Marking .22
13 Protection .22
14 Documents .22
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ISO 9330-5:2000(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 9330 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 9330-5 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 19,
Technical delivery conditions for steel tubes for pressure purposes.
ISO 9330 consists of the following parts, under the general title Welded steel tubes for pressure purposes —
Technical delivery conditions:
� Part 1: Unalloyed steel tubes with specified room temperature properties
� Part 2: Electric resistance and induction welded unalloyed and alloyed steel tubes with specified elevated
temperature properties
� Part 3: Electric resistance and induction welded unalloyed and alloyed steel tubes with specified low
temperature properties
� Part 4: Submerged arc-welded unalloyed and alloyed steel tubes with specified elevated temperature
properties
� Part 5: Submerged arc-welded unalloyed and alloyed steel tubes with specified low temperature properties
� Part 6: Longitudinally welded austenitic stainless steel tubes
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INTERNATIONAL STANDARD ISO 9330-5:2000(E)
Welded steel tubes for pressure purposes — Technical delivery
conditions —
Part 5:
Submerged arc-welded unalloyed and alloyed steel tubes
with specified low temperature properties
1 Scope
This part of ISO 9330 specifies the technical delivery conditions for submerged arc-welded tubes of circular cross-
section, made of unalloyed or alloyed steel with specified low temperature properties. These tubes are intended for
pressure purposes in cases when the material is also used as part of a low temperature piping system.
The requirements of appropriate international application standards and relevant national legal regulations shall be
taken into account by the user. For pressure-containing equipment International Standard ISO 5730 is available.
For the general technical delivery requirements, see ISO 404.
NOTE The English words “tube” and “pipe” are synonymous.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 9330. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 9330 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
1)
ISO 148:1983 , Steel — Charpy impact test (V-notch).
ISO 377:1997, Steel and steel products — Location and preparation of samples and test pieces for mechanical
testing.
IS0 404:1992, Steel and steel products — General technical delivery requirements.
ISO 643:1983, Steels — Micrographic determination of the ferritic or austenitic grain size.
ISO 2566-1:1984, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels.
ISO 3205:1976, Preferred test temperatures.
ISO 3545-1:1989, Steel tubes and fittings — Symbols for use in specifications — Part 1: Tubes and tubular
accessories with circular cross-section.
1) This International Standard has been withdrawn and replaced by ISO 148-1:—, ISO 148-2:1998 and ISO 148-3:1998.
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ISO 9330-5:2000(E)
ISO 4200:1991, Plain end steel tubes, welded and seamless — General tables of dimensions and masses per unit
length.
ISO 4948-1:1982, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based
on chemical composition.
ISO/TR 4949:1989, Steel names based on letter symbols.
ISO 5173:1981, Fusion welded butt joints in steel — Transverse root and face bend test.
ISO 5177:1981, Fusion welded butt joints in steel — Transverse side bend test.
ISO 5252:1991, Steel tubes — Tolerance systems.
ISO 6761:1981, Steel tubes — Preparation of ends of tubes and fittings for welding.
ISO 6892:1998, Metallic materials — Tensile testing at ambient temperature.
ISO 7438:1985, Metallic materials — Bend test.
ISO 9765:1990, Submerged arc-welded steel tubes for pressure purposes — Ultrasonic testing of the weld seam
for the detection of longitudinal and/or transverse imperfections.
ISO 10474:1991, Steel and steel products — Inspection documents.
ISO 11496:1993, Seamless and welded steel tubes for pressure purposes — Ultrasonic testing of tube ends for the
detection of laminar imperfections.
ISO 12094:1994, Welded steel tubes for pressure purposes — Ultrasonic testing for the detection of laminar
imperfections in strip/plates used in the manufacture of welded tubes.
IS0 12096:1996, Submerged arc-welded steel tubes for pressure purposes — Radiographic testing of the weld
seam for the detection of imperfections.
ISO 14284:1996, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition.
3 Symbols
3.1 Fundamental symbols
D is the specified outside diameter.
T is the specified wall thickness.
3.2 Symbols for tolerances
See ISO 5252.
3.3 Symbols for tests
3.3.1 Tensile test
See ISO 6892.
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ISO 9330-5:2000(E)
3.3.2 Hydraulic test
p is the test pressure.
E
� is the stress which occurs in the metal during the test.
4 Information to be supplied by the purchaser
4.1 Mandatory information
The purchaser shall state on his enquiry and order the following information:
a) the denomination “tube”;
b) reference to the relevant dimensional standard;
c) dimensions (outside diameter � wall thickness), see 7.1;
d) length, see 7.2;
e) tolerances if exact lengths greater than 12 m are ordered, see 7.3.4;
f) reference to this part of ISO 9330, i.e. ISO 9330-5;
g) steel grade, see Table 1;
h) test category for unalloyed steels, see 9.3.1.
4.2 Optional information
Enquiries and orders for tubes in accordance with this part of ISO 9330 shall be supplemented, if it is deemed
necessary by the purchaser, with the indication of one or more of the following optional requirements, which shall
be the subject of special agreements:
a) dimensions (inside diameter � wall thickness) see 7.1;
b) steelmaking process, see 5.1;
c) delivery condition, see 5.4;
d) special straightness requirements, see 7.3.6;
e) tolerances on the height of the weld seam, see 7.3.2;
f) bevelled ends, see 8.2;
g) product analysis, see 10.1.3;
h) tensile testing of weld for tubes over 219 mm but less than 508 mm outside diameter, see 10.1.3;
i) impact test on the weld and/or heat affected zone, see 10.1.3;
j) specific marking, see 12.3;
k) protective coating, see 13;
l) type of inspection and testing and corresponding document, see 9.2 and 14.
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ISO 9330-5:2000(E)
4.3 Example of an order
Example of an order conforming to the dimensional standard ISO 4200, with an outside diameter of 457 mm, a wall
thickness of 10 mm and a standard length (random length) of 4 m to 8 m, made of steel grade PL 21 with specified
elevated temperature properties to be submitted to specific inspection and testing to test category I involving the
issuing of an inspection document 3.1.B in accordance with ISO 10474:1991.
Tube ISO 4200 - 457 ����10-4to 8- ISO9330-4- PL 21-l-3.1.B
5 Manufacturing process
5.1 Steelmaking process
If requested, the purchaser shall be informed of the steelmaking process used.
Steels may be cast in ingots or may be strand cast. When steels of different grades are sequentially strand cast
identification of the resultant transition material is required. The producer shall remove the transition material by an
established procedure that positively separates the grades.
5.2 Deoxidation process
Steels intended for the production of tubes covered by this part of ISO 9330 shall be fully-killed.
5.3 Product-making process for tubes
A welded tube is obtained by shaping a flat-rolled product and then welding the edges. The weld may be
longitudinal or helical.
Tubes shall be submerged arc-welded (SAW) using at least one run on the inside and one run on the outside of the
tube. Unless otherwise agreed, the process of manufacture is left to the discretion of the manufacturer, provided
that the welding method and welder/welding operator have been approved in accordance with a qualified
procedure.
Tubes covered by this part of ISO 9330 may be hot finished or cold finished. The terms “hot finished” and “cold
finished” apply to the condition of the tube before it is heat treated, if applicable.
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ISO 9330-5:2000(E)
5.4 Delivery condition
Tubes covered by this part of ISO 9330 shall be supplied heat-treated over their full length. The following heat
treatments shall be used depending on the type of steel, see Table 1.
� normalizing;
� normalizing and tempering;
� quenching and tempering.
Table 1 — Heat treatment conditions
Quenching and tempering temperature
°C
Reference Normalizing Tempering
Steel grade
temperature temperature
heat treatment
Hardening Tempering
(see Table 2) Cooling
a
°C °C
temperature temperature
b
medium
°C °C
PL 21 N 900-940 —— — —
PL 23 N 890-930 —— — —
Unalloyed
water or
steels
PL 25 Q+T —— 890-930 600-680
oil
PL 26 N 890-930 —— — —
c
11 MnNi 5-3 890-940 580-640 —— —
N
c
13 MnNi 6-3 890-940 580-640 —— —
N
water or
d
12 Ni 14 830-880 580-640 820-880 580-660
Q+T
Alloyed
oil
steels
water or
d
X12Ni 5 800-850 580-640 800-850
Q+T 580-660
oil
water or
X10 Ni 9 Q+T 880-930 — 770-820 540-600
oil
a
N = normalizing; Q � T = quenching� tempering.
b
When choosing the cooling medium the influence of other parameters, such as dimensions and quenching
temperature, on properties and crack susceptibility shall be taken into account. Other cooling media such as synthetic
quenchants may also be used.
c
Tempering can occasionally be necessary after normalizing. In such a case the manufacturer shall inform the
purchaser accordingly and shall state the tempering temperature as well.
d
If the product’s dimensions so permit, normalizing (with subsequent tempering if necessary) may be carried out at the
manufacturer’s discretion instead of quenching and tempering. In such a case the manufacturer shall inform the
purchaser accordingly.
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ISO 9330-5:2000(E)
6 Metallurgical properties
6.1 Chemical composition
6.1.1 Heat analysis
The heat analysis reported by the steel producer shall apply and comply with the requirements given in Table 2.
Table 2 — Chemical composition (heat analysis), % (m/m)
CSI Mn P S Al Mo Ni V Nb
a
Steel grade
max. max. max. max. (total) min. max. max. max.
b
PL 21 0,17 0,35 0,40-1,00 0,030 0,025 —— — —
0,015
b
PL 23 0,19 0,35 0,60-1,20 0,030 0,025 —— — —
Unalloyed 0,015
b
steel
PL 25 0,17 0,35 0,40-1,00 0,030 0,025 —— — —
0,015
b
PL 26 0,20 0,35 0,80-1,40 0,030 0,025 —— — —
0,015
c d
11 MnNi5-3 0,14 0,50 0,70-1,50 0,030 0,025 — 0,05 0,05
0,020 0,3 -0,8
c d
13 MnNi6-3 0,18 0,50 0,85-1,65 0,030 0,025 — 0,05 0,05
0,020 0,3 -0,8
Alloyed
12 Ni 14 0,15 0,35 0,3-0,8 0,025 0,020 0,020 — 3,25-3,75 0,05 —
steel
X 12 Ni 5 0,15 0,35 0,3-0,8 0,025 0,020 0,020 — 4,5-5,3 0,05 —
X 10 Ni 9 0,13 0,35 0,3-0,8 0,025 0,020 0,020 010 8,5-9,5 0,05
NOTE Elements not included in this table should not be intentionally added without the agreement of the purchaser except
for elements which may be added for deoxidation and finishing of the heat. All reasonable precautions should be taken to
prevent the addition of elements from scrap or other materials used in the manufacture, but residual elements may be
present provided that the mechanical properties and applicability are not adversely affected. If the amount of residual
elements is likely to affect the weldability of the steel, the content of such elements (heat analysis) should be stated in the
documents mentioned in clause 14.
a
Classification in accordance with ISO 4948-1, designation in accordance with ISO/TR 4949.
b
Metallic aluminium content. Where the total aluminium content is determined, the results shall be deemed to meet the
requirement provided the total aluminium content value obtained is not less than 0,018 % (m/m). In case of dispute, the
metallic aluminium content shall be determined. Alternatively, an austenitic grain size of 6 or finer, determined in accordance
with ISO 643, can be agreed upon. By agreement between the interested parties, aluminium may be replaced by other
elements having a similar effect.
c
Total aluminium content. By agreement between the interested parties, aluminium may be replaced by other elements
having a similar effect.
d
The lower limit value for the nickel content may be reduced to not less than 0,15 % (m/m) for tubes with wall thickness
u 10 mm.
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ISO 9330-5:2000(E)
6.1.2 Product analysis
If a product analysis is required (see 10.1.3), the permissible deviations given in Table 3 shall apply to the heat
analysis specified in Table 2.
The deviations, other than when maxima only are specified, apply either above or below the specified limits of the
range but not both above and below for the same element from different sample products from the same heat.
When maxima only are specified, the deviations are positive only.
Table 3 — Permitted deviations from the specified chemical composition limits given in Table 2
Content specified for the
heat analysis
Element Permissible deviation
%(m/m)
C u 0,20
� 0,05
Si u 0,50 � 0,05
Mn u 1,65 � 0,10
P u 0,030 � 0,005
S u 0,025 � 0,005
Al – 0,005
W 0,020
Mo
u 0,10 � 0,04
u 0,85 � 0,05
� 0,85u 3,75 � 0,07
Ni
� 3,75u 5,30 � 0,10
� 5,30u 9,50 � 0,15
V u 0,05
� 0,01
Nb u 0,05
� 0,01
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ISO 9330-5:2000(E)
6.2 Mechanical properties
6.2.1 At room temperature
The mechanical and technological properties of the tubes covered by this part of ISO 9330, measured at room
temperature (23°C � 5°C, see ISO 3205), to be obtained on test pieces selected, prepared and tested in
accordance with clause 9, shall comply with the requirements of Table 4.
Table 4 — Mechanical properties at room temperature
Tensile test Bend test
Reference
R or R or R for wall
heat eH p0,2 t0,5 Elongation
Tensile
Diameter
b
treatment
thicknesses
Steel grade strength for wall thickness
of the
mandrel
� 13 mm � 25 mm
a b
R
u 40 mm
u 13 mm
m
u 25 mm u 40 mm
2 2
N/mm N/mm %Mm
c
PL21 N 360-480 215 215 24 4T
c 4T
PL23 N 410-530 235 235 22
Unalloyed
steels
PL25 N 360-490 255 255 235 21 4T
c 4T
PL26 N 480-580 265 275 21
11MnNi5-3 N 410-530 285 275 265 22 4T
13MnNi 6-3 N 490-610 355 345 335 20 4T
Alloyed
12 Ni 14 Q+ T 440-590 245 245 245 16 7T
steels
X 12Ni 5 Q+ T 510-710 390 390 380 17 7T
X1ONi 9 Q+ T 690-840 510 510 510 15 7T
a
N = normalizing; Q + T = quenching � tempering, see 8.3.
b
For wall thicknesses � 40 mm the values to be obtained shall be the subject of agreement between the purchaser and the manufacturer at
the time of ordering.
c
To be agreed at the time of ordering.
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ISO 9330-5:2000(E)
6.2.2 At low temperature
Table 5 gives minimum values for the impact energy, as determined on ISO V-notch test pieces, used to
characterize the cold-toughness of the various steel grades at low temperature (see also footnote b to Table 5).
Impact tests shall be carried out only at the lowest temperature indicated in Table 5 for each steel grade
(see also 10.1.3).
Table 5 — Impact properties at low temperature
b
Minimum impact test value
Wall
a
Av
Orientation
thickness
of test J
T
Steel grade pieces with
Temperature
mm
respect to
°C
tube axis
� 20
� 196 � 120 � 110 � 100 � 90 � 60 � 50 � 40 � 20
PL 21 u 10 ———— — — — 40 45 55
Longitudinal
Longitudinal ———— — — 27 40 45 50
u 25
PL 23
Transverse ———— — — 27 30 35
Longitudinal ———— — — 40 45 50 60
u 25
Unalloyed
Transverse ———— — — 27 30 35 40
steels
PL 25
Longitudinal ———— — — — 40 45 55
� 25u 40
Transverse ———— — — — 27 30 35
Longitudinal ———— — — 27 40 45 50
u 25
PL 26
Transverse ———— — — — 27 30 35
11 MnNi 3-4 Longitudinal ———— — 40 45 50 55 70
u 40
11 MnNi 6-3 Transverse ———— — 27 30 35 40 45
Longitudinal ——— 40 45 50 55 55 60 65
u 25
Transverse ——— 27 30 35 35 40 45 45
12 Ni 14
Longitudinal ———— 40 45 50 50 55 65
� 25u 40
Transverse ———— 27 30 30 35 40 45
Alloyed
steels
Longitudinal — 40 45 50 55 65 65 65 70 70
u 25
Transverse — 27 30 30 35 45 45 45 50 50
X12 Ni 5
Longitudinal —— 40 45 50 60 65 65 65 70
� 25u 40
Transverse —— 27 30 30 40 45 45 45 50
Longitudinal 40 50 50 60 60 70 70 70 70 70
u 40
X10 Ni 9
Transverse 27353540 40 50 50 50 50 50
a
The values for tubes with wall thickness exceeding the maximum value shown in the table shall be agreed at the time of enquiry and order.
b
Average of three test pieces. Single values not less than 70 % of the average value. The values apply to standard 10 mm � 10 mm test
pieces. For different sizes of test pieces, see 11.5.
6.3 Weldability
Steels intended for the production of tubes covered by this part of ISO 9330 are generally regarded as being
weldable. However, account should be taken of the fact that the behaviour of the steel during and after welding is
dependent not only on the steel, but also significantly, on the condition of preparing and carrying out the welding.
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ISO 9330-5:2000(E)
7 Dimensions, masses and tolerances
7.1 Diameters, wall thicknesses and masses
The outside diameters, wall thicknesses and masses of the tubes covered by this part of ISO 9330 should be
selected from those given in ISO 4200.
By agreement between the purchaser and the manufacturer tubing specified by inside diameter and wall thickness
can be supplied. In such a case the dimensions and the tolerances required should be agreed upon at the time of
enquiry and order.
7.2 Lengths
7.2.1 It shall be stated on the enquiry and order whether the tubes are to be delivered with random lengths,
see 7.2.2, or with exact lengths, see 7.2.3.
7.2.2 If the tubes are to be delivered with random lengths, the length range shall be agreed upon at the time of
inquiry and ordering.
7.2.3 If the tubes are to be delivered with exact lengths, the length tolerances given in 7.3.4 shall apply.
7.3 Tolerances
7.3.1 Tolerances on outside diameter and on wall thickness (excluding the weld)
The outside diameters and the wall thicknesses of the tubes covered by this part of ISO 9330 shall be within the
tolerance limits given in Table 6, see 9.3.2.2.
Within areas where the tube surface has been dressed by mechanical machining (such as grinding), e.g. as a
result of instructions required for the performance of non-destructive testing, it is permissible to exceed the minus
deviation on the outside diameter by a small amount over a length of not more than 1 m, provided that wall
thickness remains within the lower tolerance limits.
Table 6 — Tolerances on outside diameter and on wall thickness (excluding the weld seam)
Tolerances on
(see ISO 5252)
DT
� 0,75 % with a min. of �10 % with a min. of
� 0,5 mm � 0,2 mm
7.3.2 Tolerances on the height of the weld seam
The heights of the external and internal weld seam shall be within the tolerance limits indicated in Table 7
(see 9.3.2.2).
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ISO 9330-5:2000(E)
Table 7 — Tolerances on height of weld seam
Wall thickness (T) Maximum height of external and
internal weld seam reinforcement
mm mm
Tu 8 3
3,5
8� Tu 14,2
4,8
T� 14,2
7.3.3 Misalignment of plate edges at the weld
Radial misalignment of the abutting plate or strip edges shall not exceed the following limits:
� for wall thicknessesu 12,5 mm: 1,6 mm;
� for wall thicknesses � 12,5 mm: 12,5 % of specified wall thickness or 3,2 mm, whichever is the smaller.
7.3.4 Tolerances on exact lengths
� 10 mm
� for lengthsu 6m:
0
� 15 mm
� for lengths � 6mu 12 m:
0
For lengths � 12 m, the applicable tolerance shall be agreed upon between the purchaser and the manufacturer.
7.3.5 Ovality
The ovality shall be determined as a percentage using the following formula, see ISO 3545-1:
_
DD
max min
Ovality � 100
D
Where D and D are respectively the maximum and the minimum outside diameters measured in the same
max min
cross-section.
For tubes having D� 406 mm, the ovality is included in the limits of the diameter tolerances.
For tubes having DW 406 mm, the ovality shall not exceed 2 % if the D/T ratio is � 100. If the D/T ratio isW 100, the
tolerance on ovality shall be agreed upon between the purchaser and manufacturer.
7.3.6 Straightness
All tubes shall be reasonably straight. The deviation from straightness shall not exceed 0,002 � L where L is the
length. Deviation from straightness over any one metre length shall not exceed 3 mm.
Special requirements regarding straightness shall be the subject of an agreement between the purchaser and the
manufacturer.
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ISO 9330-5:2000(E)
8 Technical delivery conditions
8.1 Appearance and soundness
8.1.1 The tubes shall be free from such defects as can be established by visual inspection and testing in
accordance with this part of ISO 9330.
8.1.2 The tubes shall have a finish and internal and external surface condition typical of the manufacturing
process and, when applicable, the heat-treated condition. The finish and surface condition shall permit surface
imperfections or marks requiring dressing to be identified.
8.1.3 It shall be permissible to dress, by grinding or machining, surface marks and imperfections provided that
the thickness of the tube after dressing does not fall below the minimum permitted wall thickness.
8.1.4 Surface imperfections which encroach on the minimum wall thickness shall be considered defects and shall
be deemed not to comply with this part of ISO 9330.
8.1.5 All dressed areas shall blend smoothly into the contour of the tube.
8.1.6 The manufacturer shall explore, by grinding, a sufficient number of surface marks and imperfections
identified during visual inspection to provide assurance that these have been evaluated to ensure compliance with
8.1.7.
8.1.7 The manufacturer shall, subject to the limitations given in 8.1.8, dress surface marks and imperfections
found by exploration in accordance with 8.1.6 to be deeper than 5 % of the specified thickness but not less than
0,5 mm.
8.1.8 If surface imperfections acceptable under 8.1.7 are not scattered and/or appear over a large area in excess
of what is considered to be an acceptable surface condition then tubes shall be rejected or alternatively subjected
to dressing as agreed upon between the purchaser and the manufacturer.
8.1.9 Repairs to the parent metal of the tubes shall only be carried out by grinding or machining. Peening or
welding are not permitted.
NOTE Repairs to the weld seam are permitted, in accordance with an established procedure.
8.2 Preparation of ends
Tubes are normally delivered with square cut ends. By agreement between the purchaser and the manufacturer at
the time of ordering they can also be delivered with bevelled ends, see ISO 6761. The ends shall be free from
excessive burrs.
8.3 Delivery conditions
When the tubes are delivered in the heat-treated condition the parameters given in Table 2 shall apply.
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ISO 9330-5:2000(E)
9 Inspection and testing
9.1 Type of inspection and testing
The inspection and testing procedure for deliveries in accordance with this part of ISO 9330 shall be as specified in
ISO 404.
9.2 Types of the inspection document
Tubes delivered in accordance with this part of ISO 9330 shall be provided with an inspection certificate, 3.1.B, in
accordance with ISO 10474, see 4.2.
NOTE If inspec
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