ISO 13680:2000

INTERNATIONAL ISO
STANDARD 13680
First edition
2000-07-01
Petroleum and natural gas industries —
Corrosion-resistant alloy seamless tubes
for use as casing, tubing and coupling
stock — Technical delivery conditions
Industries du pétrole et du gaz naturel — Tubes sans soudure en acier allié
résistant à la corrosion utilisés comme tubes de cuvelage, tubes de
production et tubes-ébauches pour manchons — Conditions techniques de
livraison
Reference number
©
ISO 2000
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body
in the country of the requester.
ISO copyright office
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2000 – All rights reserved

Contents Page
1 Scope .1
2 Normative references .1
3 Terms and definitions, symbols and abbreviated terms .3
3.1 Terms and definitions .3
3.2 Symbols .5
3.3 Abbreviated terms .5
4 Classification.6
5 Information to be supplied by the purchaser .6
6 Material design qualification .7
7 Manufacturing process .7
7.1 Manufacturing of corrosion-resistant alloys .7
7.2 Tube manufacturing process .7
8 Requirements.8
8.1 General.8
8.2 Chemical composition .8
8.3 Mechanical properties.9
8.4 Corrosion properties .11
8.5 Microstructure properties .11
8.6 Visual inspection .11
8.7 Non-destructive examination .12
8.8 Hydrostatic test.12
9 Dimensions, masses and tolerances.13
9.1 Outside diameter, wall thickness and mass .13
9.2 Length.15
9.3 Tolerances.16
10 Inspection and testing.18
10.1 Types of inspection document.18
10.2 Type and frequency of tests.19
10.3 Purchaser inspection .20
10.4 Testing of chemical composition.20
10.5 Testing of mechanical and other characteristics.20
10.6 Inspection of dimensions .23
10.7 Visual inspection .23
10.8 Non-destructive examination (NDE) .23
10.9 Invalidation of the tests.23
10.10 Retests .23
10.11 Sorting or reprocessing .23
11 Test methods.23
11.1 Chemical analysis.23
11.2 Tensile test .23
11.3 Hardness test .24
11.4 Impact test.25
11.5 Corrosion test .25
11.6 Microstructure examination.25
11.7 Visual inspection .26
11.8 Non-destructive examination .26
11.9 Dimensional testing.27
11.10 Hydrostatic test.29
12 Marking .29
12.1 General.29
12.2 Marking on tubes for casing, tubing and coupling stock.29
12.3 Colour code identification.30
13 Surface treatment .32
13.1 General.32
13.2 Group 1 .32
13.3 Groups 2, 3 and 4.32
14 Surface protection .32
15 Handling, packing and storage.33
15.1 General.33
15.2 Handling.33
15.3 Packing .33
15.4 Storage.33
15.5 Complaints after delivery.33
Bibliography .34
iv © ISO 2000 – All rights reserved

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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 13680 was prepared by Technical Committee ISO/TC 67, Materials, equipment and
offshore structures for petroleum and natural gas industries, Subcommittee SC 5, Casing, tubing and drill pipe.
INTERNATIONAL STANDARD ISO 13680:2000(E)
Petroleum and natural gas industries — Corrosion-resistant alloy
seamless tubes for use as casing, tubing and coupling stock —
Technical delivery conditions
1 Scope
This International Standard specifies the technical delivery conditions for corrosion-resistant alloy seamless tubes
for casing, tubing and coupling stock.
This International Standard is applicable to the following four groups of tube product:
� Group 1, comprised of stainless alloy with a martensitic or martensitic/ferritic structure;
� Group 2, comprised of stainless alloy with a ferritic-austenitic structure, such as duplex and super duplex
stainless alloy;
� Group 3, comprised of stainless alloy with an austenitic structure (iron base);
� Group 4, comprised of nickel-based alloys with an austenitic structure (nickel base).
This International Standard contains no provisions relating to the connection or other methods by which individual
lengths of tube are joined to form a string.
NOTE The connection or joining method can influence the corrosion performance of the materials specified in this
International Standard.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard 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.
ISO 148, Steel — Charpy impact test (V-notch).
ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing.
ISO 404, Steel and steel products — General technical delivery requirements.
ISO 643, Steels — Micrographic determination of the ferritic or austenitic grain size.
ISO 783, Metallic materials — Tensile testing at elevated temperature.
ISO 3545-1, Steel tubes and fittings — Symbols for use in specifications — Part 1: Tubes and tubular accessories
with circular cross-section.
ISO 4885, Ferrous products — Heat treatments — Vocabulary.
ISO 4948-1, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based on
chemical composition.
ISO 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main quality
classes and main property or application characteristics.
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A,B, C, D,E,F,G, H,K,
N, T).
ISO 6892, Metallic materials — Tensile testing at ambient temperature.
ISO 6929, Steel products — Definitions and classification.
ISO 7539-1, Corrosion of metals and alloys — Stress corrosion testing — Part 1: General guidance on testing
procedures.
ISO 7539-2, Corrosion of metals and alloys — Stress corrosion testing — Part 2: Preparation and use of bent-
beam specimens.
ISO 7539-3, Corrosion of metals and alloys — Stress corrosion testing — Part 3: Preparation and use of U-bend
specimens.
ISO 7539-4, Corrosion of metals and alloys — Stress corrosion testing — Part 4: Preparation and use of uniaxially
loaded tension specimens.
ISO 7539-5, Corrosion of metals and alloys — Stress corrosion testing — Part 5: Preparation and use of C-ring
specimens.
ISO 7539-6, Corrosion of metals and alloys — Stress corrosion testing — Part 6: Preparation and use of pre-
cracked specimens.
ISO 7539-7, Corrosion of metals and alloys — Stress corrosion testing — Part 7: Slow strain rate testing.
ISO 8501-1:1988, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and
of steel substrates after overall removal of previous coatings.
ISO 9303, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Full
peripheral ultrasonic testing for the detection of longitudinal imperfections
ISO 9304, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Eddy
current testing for the detection of imperfections.
ISO 9305, Seamless steel tubes for pressure purposes — Full peripheral ultrasonic testing for the detection of
transverse imperfections.
ISO 9402, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Full
peripheral magnetic transducer/flux leakage testing of ferromagnetic steel tubes for the detection of longitudinal
imperfections.
ISO 9712, Non-destructive testing — Qualification and certification of personnel.
ISO 10124, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes — Ultrasonic
testing for the detection of laminar imperfections.
ISO 10474:1991, Steel and steel products — Inspection documents.
2 © ISO 2000 – All rights reserved

ISO 10543, Seamless and hot-stretch-reduced welded steel tubes for pressure purposes — Full peripheral
ultrasonic thickness testing.
ISO 11484, Steel tubes for pressure purposes — Qualification and certification of non-destructive testing (NDT)
personnel.
ISO 11496, Seamless and welded steel tubes for pressure purposes — Ultrasonic testing of tube ends for the
detection of laminar imperfections.
ISO 11845, Corrosion of metals and alloys — General principles for corrosion testing.
ISO 11960, Petroleum and natural gas industries — Steel pipes for use as casing or tubing for wells.
ISO 13665, Seamless and welded steel tubes for pressure purposes — Magnetic particle inspection of the tube
body for the detection of surface imperfections.
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical composition.
ASTM E 112, Standard test methods for determining average grain size.
ASTM E 562, Standard method for determining volume fraction by systematic manual point count.
ASTM G 48, Test method for pitting and crevice corrosion resistance of stainless steels and related alloys by the
use of ferric chloride solution.
ASTM G 78, Guide for corrosion testing of iron base and nickel base stainless alloys in seawater and other chloride
aqueous environments.
NACE TM-01-77, Standard test method — Laboratory testing of resistance to sulphide stress cracking in H S
environments.
3 Terms and definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this International Standard, the terms and definitions given in ISO 377, ISO 404, ISO 4885,
ISO 4948-1, ISO 4948-2, ISO 6929, ISO 10474 and the following apply.
3.1.1
coupling stock
tubular stock used for the manufacture of coupling blanks
3.1.2
casing
tube used in wells to seal off the bore hole
3.1.3
tubing
tube used in wells to conduct fluid from the well's producing formation into the Christmas tree or vice versa
3.1.4
quench hardening
quenching
heat treatment requiring austenitization followed by cooling, under conditions such that austenite transforms into
martensite
NOTE 1 Quench hardening is often followed by tempering.
NOTE 2 Adapted from ISO 4885.
3.1.5
tempering
heating, one or more times, to a specific temperature below the lower critical temperature and holding at that
temperature
NOTE 1 Tempering is often preceded by quench hardening.
NOTE 2 Adapted from ISO 4885.
3.1.6
solution annealing
heating to a suitable temperature, holding at that temperature long enough to cause one or more constituents to
enter into solid solution, then cooling rapidly enough to hold such constituents in solution
[ISO 4885]
3.1.7
cold finishing
cold-working operation which results in a permanent strain if a final solution annealing is not performed
NOTE The percentage of cold work depends on the specified strength level for each material grade, as shown in Table 3
for the cold-worked condition.
3.1.8
imperfection
discontinuity or irregularity in the product detected by methods outlined in this International Standard
3.1.9
linear imperfection
imperfection including, but not limited to, seams, laps, cracks, plug scores, cuts and gouges
3.1.10
defect
imperfection having sufficient magnitude to warrant rejection of the product based on the stipulations of this
International Standard
3.1.11
corrosion-resistant alloy
alloy intended to be resistant to general and localized corrosion and/or environmental cracking in environments that
are corrosive to carbon and low-alloy steels
3.1.12
hot finishing
deforming metal plastically at such a temperature and strain rate that recrystallization takes place simultaneously
with the deformation, thus preventing permanent strain hardening
3.1.13
test unit
unit formed by tubes from the same heat, with the same outside diameter and wall thickness, the same grade, the
same manufacturing process, the same final heat-treatment conditions and the same cold-working parameters
4 © ISO 2000 – All rights reserved

3.2 Symbols
For the purposes of this International Standard, the symbols given in ISO 3545-1 and ISO 6892 apply. For the
convenience of the reader, those symbols applicable are shown below.
d: Inside diameter of the tube, expressed in millimetres
D: Outside diameter of the tube, expressed in millimetres
T: Wall thickness of the tube, expressed in millimetres
M: Mass per unit length, expressed in kilograms per metre
P : Test pressure, expressed in pascals (additionally in bar, if desired)
E
R Tensile strength, expressed in megapascals
m:
R Proof strength (0,2 % non-proportional elongation), expressed in megapascals
p0,2:
A: Percentage elongation after fracture
3.3 Abbreviated terms
AD: Argon oxygen decarburization
CCT: Critical crevice temperature
CPT: Critical pitting temperature
CW: Cold-worked
ESR: Electro slag remelting
ET: Electromagnetic inspection
HF: Hot-finished
HRC: Rockwell hardness scale C
L+T: Longitudinal+transverse
MPS: Manufacturing procedure specification
MT: Magnetic particle inspection
NDE: Non-destructive examination
PM: Powder metallurgy
PRE: Pitting-resistance equivalent number
QT: Quenched and tempered
SA: Solution-annealed
UT: Ultrasonic testing
VAD: Vacuum arc degassing
VAR: Vacuum arc remelting
VIM: Vacuum induction melting
VOD: Vacuum oxygen decarburization
4 Classification
The corrosion-resistant alloys included in this International Standard are special alloys in accordance with
ISO 4948-1 and ISO 4948-2.
5 Information to be supplied by the purchaser
5.1 The purchaser shall state the following minimum information in the enquiry and purchase order:
a) quantity of tube;
b) product designation: tube for casing, tubing or coupling stock;
c) reference to this International Standard;
d) material category and grade (Tables 2 and 3);
e) dimensions, in millimetres (Table 7);
f) length range (9.2);
g) type of inspection document (10.1).
EXAMPLE For the following requirements,
— tubing quantity: 1 000 m,
— product: tubes for casing,
— material category and grade: 13-5-2/95,
— dimensions [expressed as outside diameter (in mm) × wall thickness (in mm) × length range]:
177,80 × 8,05 × R3,
� inspection document: Certificate 3.1.B according to ISO 10474:1991.
This information should preferably be given as:
1 000 m tube for casing ISO 13680 — 13-5-2/95 — 177,80 × 8,05 × R3 ISO 10474 — 3.1.B
5.2 This International Standard allows the purchaser and manufacturer to agree, in special cases, on other
conditions instead of or in addition to the requirements of this International Standard. If the purchaser or
manufacturer intends to make use of the following options, this shall be clearly indicated at the enquiry stage and
stated in the purchase order and in the confirmation of the order:
a) chemical composition (8.2);
b) mechanical properties at room temperature (8.3.1);
c) mechanical properties at elevated temperature (8.3.2);
d) impact properties (8.3.3);
e) internal surface roughness (8.6.1.1);
f) NDE method (8.7);
g) tolerances on outside diameter, wall thickness and mass of tubes for coupling stock (9.3.1.2);
h) surface protection (14.2);
i) hydrostatic test (8.8 and 11.10);
j) corrosion tests (8.4).
6 © ISO 2000 – All rights reserved

6 Material design qualification
The manufacturer who developed the material shall test it and report physical and mechanical properties, product
chemical composition and corrosion-resistance characteristics as specified in Table 12. Any documented
assumptions, calculations and test results shall be included.
This documentation shall provide objective evidence for the environmental and operational conditions for which the
manufacturer has developed the material.
When requested by the user, the supplier shall provide the above documentation to the user with the aim of
assisting the user in assessing the suitability of the material for the user's application.
If requested by the user, all tests required to characterize anisotropy shall be part of the supplier material
qualification.
NOTE Cold-worked materials are prone to anisotropy of proof strength, dependent on the amount of cold work and the
manufacturing processes. This should be considered in any application.
7 Manufacturing process
7.1 Manufacturing of corrosion-resistant alloys
The alloys covered by this International Standard shall be made by the basic oxygen process or the electric furnace
process followed by further refining operations such as AOD, VOD, VAR, ESR, VIM and VAD.
7.2 Tube manufacturing process
Tube manufacturing processes, starting material and heat-treatment or cold-finished conditions are listed in
Table 1.
Group 1 tubes and Group 2 solution-annealed tubes, as defined in Table 2, shall be full-length heat-treated after
any upsetting, in accordance with 3.1.4 or 3.1.5.
Table 1 — Tube manufacturing process, starting material, tube-forming and heat-treatment conditions
Tube-forming Heat-treatment or cold-worked
Starting material Symbol
conditions conditions
Hot-finished
Ingot/billet
Quenched and tempered QT
— Hot-rolled
or
rolled/forged
or
Solution-annealed SA
bar
— Hot-extruded
a
Cold-finished
Ingot/billet
Cold worked CW
— Cold drawing
or
rolled/forged/machined
or
Solution-annealed SA
bar
— Cold pilgering
a
Cold-finished
Cold worked CW
— Cold drawing
Hot-finished
hollow
or
Solution-annealed SA
— Cold pilgering
a
For cold-finished products, there shall be a minimum reduction in area ratio of 3:1 between the cast ingot or billet and the
last hot working or heat treatment.
8 Requirements
8.1 General
Products shall be tested in accordance with clauses 10 and 11 and shall comply with the requirements of clauses 8
and 9 of this International Standard.
In addition to the requirements of this International Standard, the general technical delivery requirements specified
in ISO 404 shall apply.
8.2 Chemical composition
In Table 2 generic types of alloy are listed with their nominal content of key chemical elements.
The manufacturer shall state the nominal chemical composition in the offer to the purchaser, including tolerances
for acceptance by the purchaser.
For Group 2 material only, products in accordance with this International Standard shall have a pitting-resistance
equivalent number as stated in Table 2.
Table 2 — Generic analysis of corrosion-resistant alloy and material categories
Typical analysis
b
Material Grade
c
PRE
%massfraction
min.
a
Group Structure Category C Cr Ni Mo N 65 80 95 110 125 140
13-5-2 0,02 13 5 2 N Y Y Y N N
Martensitic
1 15-2-1 0,1 15 1,5 0,5 0,08 N Y Y Y N N
Martensitic/ferritic 13-1-0 0,03 13 0,5 0,01 N Y Y Y N N
22-5-3 0,02 22 5 3 0,18 Y N N Y Y Y 35
Duplex
austenitic/ferritic
d
25-7-3 0,02 25 7 3 0,18 Y N N YYY 37,5
Super duplex
e
25-7-4 0,02 25 7 3,8 0,27 N Y N YYY 40
austenitic/ferritic
27-31-4 0,02 27 31 3,5 N N N Y Y Y
Austenitic
Fe base
25-32-3 0,02 25 32 3 N N N Y Y Y
21-42-3 0,02 21 42 3 N N Y Y Y N
22-50-7 0,02 22 50 7 N N N Y Y Y
Austenitic
4 25-50-6 0,03 25 50 6 N N N Y Y Y
Ni base
20-54-9 0,01 20 54 9 Fe=17 N N N Y Y Y
15-60-16 0,01 15 60 16 W=4 N N N Y Y Y
a
Designation of categories:
— 1st digit: nominal chromium content
— 2nd digit: nominal nickel content
— 3rd digit: nominal molybdenum content
b
Y = Generally available
N = Generally not available
c
PRE = %Cr+3,3(%Mo+ 0,5% W)+16% N
Group 2 may contain tungsten
d
A 75 grade is available.
e
A 90 grade is available.
8 © ISO 2000 – All rights reserved

8.3 Mechanical properties
8.3.1 Mechanical properties at room temperature
Mechanical properties at room temperature [(23 � 5) °C] of tubes covered by this International Standard are given
in Tables 3 and 4 (10.5).
Table 3 — Mechanical properties at room temperature
a
Proof strength Tensile strength Elongation Hardness
Material R R A % HRC
p0,2 m
Delivery
MPa MPa
condition
Group Category Grade min. max. min. min. max.
b
80 HF or QT 550 655 620 27
b
13-5-2 95 HF or QT 655 760 725 28
b
110 HF or QT 760 965 825 32
80 HF or QT 550 655 690 25 23
1 15-2-1
95 HF or QT 655 760 765 22 26
b
80 HF or QT 550 655 655 23
b
13-1-0 95 HF or QT 655 760 725 26
b
110 HF or QT 760 965 825 32
65 SA 450 620 620 25 26
110 CW 760 965 860 11 36
22-5-3
125 CW 860 1 035 895 10 37
140 CW 965 1 100 1 000 9 38
75 SA 515 680 635 25 26
110 CW 760 965 860 11 36
25-7-3
2 125 CW 860 1 035 895 10 37
140 CW 965 1 100 1 000 9 38
80 SA 550 725 760 20 28
90 SA 620 725 790 20 30
25-7-4 110 CW 760 965 860 12 36
125 CW 860 1 035 895 10 37
140 CW 965 1 100 1 000 9 38
110 CW 760 965 795 11 35
27-31-4 125 CW 860 1 035 895 10 37
140 CW 965 1 100 1 000 9 38
110 CW 760 965 795 11 35
25-32-3 125 CW 860 1 035 895 10 37
140 CW 965 1 100 1 000 9 38
110 CW 760 965 795 11 35
21-42-3
125 CW 860 1 035 895 10 37
110 CW 760 965 795 11 35
22-50-7 125 CW 860 1 035 895 10 37
140 CW 965 1 100 1 000 9 38
110 CW 760 965 795 11 35
25-50-6 125 CW 860 1 035 895 10 37
140 CW 965 1 100 1 000 9 38
110 CW 760 965 795 11 35
20-54-9 125 CW 860 1 035 895 10 37
140 CW 965 1 100 1 000 9 38
110 CW 760 965 795 11 35
15-60-16 125 CW 860 1 070 895 10 37
140 CW 965 1 170 1 000 9 38
a
The measured tensile strength shall be greater than the measured proof strength by at least 35 MPa.
0,2
S
b
A � 1994
0,9
R
m
where
A = minimum elongation in 50,8 mm gauge length, in %;
S = cross-sectional area of the tensile test specimen in mm based on specified outside diameter or nominal specimen width and
2 2
specified wall thickness, rounded to the nearest 10 mm , or 490 mm , whichever is smaller;
R = specified tensile strength, in MPa.
m
Table 4 — Allowable hardness variation — All categories
Wall thickness T
mm
Allowable hardness variation expressed as HRC
W �
— 12,7 3
12,7 19,05 4
19,05 25,4 5
25,4 — 6
8.3.2 Mechanical property requirements at elevated temperature
Mechanical property requirements at elevated temperatures shall be agreed between purchaser and manufacturer
at the time of enquiry and order (10.5.3.2).
8.3.3 Impact properties
The impact properties at low temperature shall be determined (10.5.3.4).
Materials shall meet the minimum absorbed impact energy requirements given in Table 5.
The test temperature shall be –10 °C, except where the minimum design temperature is less than –10 °C. When
the minimum design temperature is less than –10 °C, the test temperature shall be agreed between manufacturer
and purchaser.
Table 5 — Minimum absorbed impact energy
Absorbed energy for Charpy 10 mm × 10 mm
Temperature
J
Group
° C
longitudinal transverse
34�10027
Groups 2, 3, 4- Grade 140 27 27
The acceptable tolerance on test temperature shall be� 3 °C.
When subsize test pieces are used, the absorbed energy reduction factors given in Table 6 shall be applied.
Table 6 — Absorbed energy reduction factor
Test piece dimensions
Absorbed energy
reduction factor
mm × mm
10 × 7,5 0,80
10 ×50,55
10 © ISO 2000 – All rights reserved

For Group 1 and 2 materials, when the diameter or thickness precludes the machining of longitudinal impact test
pieces 10 mm × 5 mm or larger, the product need not be tested. However the manufacturer shall use a chemical
composition and process that is documented and demonstrated to result in impact energy absorption that meets
the minimum specified requirement.
The demonstration of equivalence of the properties shall be agreed between manufacturer and purchaser and may
involve other forms of testing including full-scale testing.
8.4 Corrosion properties
Corrosion-testing for quality control purposes is not mandatory and is not normally required. At the purchaser’s
option, quality control corrosion-testing may be specified (Table 12).
8.5 Microstructure properties
8.5.1 Group 1
For martensitic material, the delta ferrite content shall not exceed 5 % (11.6.2).
For material 13-1-0, the ferrite content may exceed 5 % by agreement between purchaser and manufacturer.
The microstructures shall have grain boundaries with no continuous precipitates or ferrite network.
8.5.2 Group 2
The microstructure shall have a ferritic-austenitic structure.
The microstructure shall have grain boundaries with no continuous precipitates. Intermetallic phases, nitrides and
carbides shall not exceed 1,0 % in total. The sigma phase shall not exceed 0,5 % (11.6.1 and 11.6.3).
The ferrite volume fraction shall be in the range 40 % to 60 % for alloys with a minimum PRE� 40 (duplex) and in
therange 35%to55%for alloys withaminimum PREW 40 (super duplex).
8.5.3 Group 3 and Group 4
The microstructures shall have grain boundaries with no continuous precipitates. Intermetallic phases, nitrides and
carbides shall not exceed 1,0 % in total. The sigma phase shall not exceed 0,5 % (11.6.1).
8.6 Visual inspection
8.6.1 Tube body
8.6.1.1 Tubes of all groups shall be free from internal scale. If the purchaser has special requirements for the
tube surface, this shall be stated at the time of enquiry and order. The purchaser shall, in this case, specify the
method, frequency, roughness values and extent of testing.
8.6.1.2 Each tube shall be free from defects as defined in 8.6.1.3.
8.6.1.3 Any imperfection on the outside or inside surface, of any orientation, shall be considered a defect if:
a) it is linear and deeper than 5 % of the specified wall thickness or 0,3 mm, whichever is greater, in the radial
direction;
b) it is linear or non-linear and results in a remaining wall thickness of less than 87,5 % of the specified wall
thickness for hot-finished products and 90 % for cold-worked products.
8.6.1.4 Imperfections that satisfy the material requirements and are less than the defect size stated in 8.6.1.3
are allowed to remain in the tube.
Repair by welding is not permitted.
Tube containing defects shall be treated in one of the following ways:
a) grinding or machining;
Defects shall be completely removed by grinding or machining, provided the remaining wall thickness is within
the limits specified in Table 9. Generous radii shall be made to prevent abrupt changes in wall thickness. The
remaining wall thickness shall be verified in accordance with 11.9.2 and shall be within the specified limits.
After removal of the defect, the affected area shall be reinspected by one or more of the non-destructive
examination methods specified in 11.8.1 to verify complete removal of the defect. The manufacturer's
documented prove-up procedures shall address the possibility that there may be coincident defects in the
affected area. The surface finish after grinding or machining shall be no rougher than original surfaces;
b) cut-off;
The part of tube containing the defect shall be cut off within the limits of requirements on length of the intended
product;
c) rejected.
The tube shall be rejected.
8.6.2 Ends
8.6.2.1 Tubes shall be delivered with plain ends. All tube ends shall be free from harmful burrs and out-of-
squareness shall be within 0,01 D.
8.6.2.2 Tubes may be end-sized after final heat treatment for purposes of threading. Group 1 materials shall
be stress-relieved at suitable temperature when end-sizing exceeds 3 % plastic strain; alternatively the tubes shall
be full-length heat-treated in accordance with a documented heat-treatment procedure. Solution-annealed
materials shall be treated by agreement.
NOTE It is very difficult to stress-relieve duplex stainless steels without the strong risk of sigma phase formation.
8.7 Non-destructive examination
Each tube shall be ultrasonically inspected for the detection of longitudinal, transverse and laminar imperfections on
the outside and inside surfaces to acceptance Level 2 if included in the relevant standard of the NDE method (11.8).
In addition, for Group 1 material each tube shall be inspected for the detection of longitudinal imperfections on the
outside surface by one of the following methods at the discretion of the manufacturer:
� flux-leakage testing to acceptance Level 2 as included in the relevant standard of the NDE method (11.8);
� eddy-current testing to acceptance Level 2 as included in the relevant standard of the NDE method (11.8);
� magnetic particle inspection in accordance with the relevant standard of the NDE method (11.8).
Tube containing defects shall be treated in one of the ways stated in 8.6.1.4.
8.8 Hydrostatic test
Unless stated on the purchase order that the tubes will be hydrostatically tested at a later date, all tubing and
casing shall be hydrostatically tested (11.10).
NOTE Due to the limitation on test equipment, the maximum hydrostatic test pressure is 68,94 MPa. This does not
preclude conducting subsequent hydrostatic tests at a fibre stress not exceeding 80 % of proof strength, in accordance with the
method of ISO 11960.
12 © ISO 2000 – All rights reserved

9 Dimensions, masses and tolerances
9.1 Outside diameter, wall thickness and mass
9.1.1 The outside diameter, wall thickness and mass of the tubes for casing and tubing covered by this
International Standard are given in Table 7.
The masses included in Table 7 were calculated using a factor of 1 in accordance with the method included in
ISO 4200. In order to determine the masses relating to the different materials, the masses in Table 7 shall be
multiplied using the following multiplication factors:
� 0,989 for ferritic and martensitic steels — Group 1
� 1 for duplex and super duplex steels — Group 2
� � for austenitic steels — Group 3
� � for austenitic Ni-based alloys — Group 4
The� and� values shall be provided by the manufacturer.
9.1.2 Dimensions other than those in Table 7 may be agreed at the time of enquiry and order.
9.1.3 For measurement of diameter, an accuracy of one decimal place shall be used for sizes larger than 6-5/8.
In this International Standard two decimal places are used for design purposes to ensure interchangeability.
Table 7 — Specified dimensions and masses of tubes for casing and tubing
c c
Outside Wall Inside Drift Mass Outside Wall Inside Drift Mass
a b a b
diameter thickness diameter diameter plain diameter thickness diameter diameter plain
end end
D T d D T d
mm mm mm mm kg/m mm mm mm mm kg/m
5,51 62,01 59,63 9,17
26,67 2,87 20,93 18,55 1,68
7,01 59,01 56,63 11,41
26,67 3,91 18,85 16,47 2,19
7,82 57,39 55,01 12,58
3,38 26,64 24,26 2,50
73,03
33,40
8,64 55,75 53,37 13,72
4,55 24,30 21,92 3,24
9,96 53,11 50,73 15,49
3,18 35,80 33,42 3,06
11,18 50,67 48,29 17,05
42,16 3,56 35,04 32,66 3,39
5,49 77,92 74,74 11,29
4,85 32,46 30,08 4,46
6,45 76,00 72,82 13,12
3,18 41,90 39,52 3,54
7,34 74,22 71,04 14,76
3,68 40,90 38,52 4,05
88,90 9,53 69,84 66,66 18,65
48,26 5,08 38,10 35,72 5,41 10,92 67,06 63,88 21,00
12,09 64,72 61,54 22,90
6,35 35,56 33,18 6,56
13,46 61,98 58,80 25,04
7,62 33,02 30,64 7,64
5,74 90,12 86,94 13,57
4,24 51,85 49,47 5,87
6,65 88,30 85,12 15,57
4,83 50,67 48,29 6,61
8,38 84,84 81,66 19,27
101,60
60,33 6,45 47,43 45,05 8,57
10,54 80,52 77,34 23,67
7,49 45,35 42,97 9,76
12,70 76,20 73,02 27,84
8,53 43,27 40,89 10,90
15,49 70,62 67,44 32,89
Table 7 — Specified dimensions and masses of tubes for casing and tubing (continued)
c c
Outside Wall Inside Drift Mass Outside Wall Inside Drift Mass
a b a b
diameter thickness diameter diameter plain diameter thickness diameter diameter plain
end end
D T d D T d
mm mm mm mm kg/m mm mm mm mm kg/m
5,21 103,88 100,70 14,02 5,87 166,06 162,88 24,89
5,69 102,92 99,74 15,24
6,91 163,98 160,80 29,12
6,35 101,60 98,42 16,91
8,05 161,70 158,52 33,70
6,88 100,54 97,36 18,23
9,19 159,42 156,24 38,21
7,37 99,56 96,38 19,44
10,36 157,08 153,90 42,78
114,30 8,56 97,18 94,00 22,32
11,51 154,78 151,60 47,20
9,65 95,00 91,82 24,90
177,80 12,65 152,50 149,32 51,52
10,92 92,46 89,28 27,84
13,72 150,36 147,18 55,52
12,70 88,90 85,72 31,82
15,88 146,04 142,86 63,41
14,22 85,86 82,68 35,10
17,45 142,90 139,72 69,01
16,00 82,30 79,12 38,79
19,05 139,70 136,52 74,58
5,59 115,82 112,64 16,74
20,62 136,56 133,38 79,93
6,43 114,14 110,96 19,12
22,23 133,34 130,16 85,29
7,52 111,96 106,78 22,16
127,00 9,19 108,62 105,44 26,70
7,62 178,44 175,26 34,98
11,10 104,80 101,62 31,73 8,33 177,02 173,84 38,08
12,14 102,72 99,54 34,39
9,53 174,62 171,44 43,28
12,70 101,60 98,42 35,80 10,92 171,84 168,66 49,22
12,70 168,28 165,10 56,68
6,20 127,30 124,12 20,41
193,68
14,27 165,14 161,96 63,14
6,99 125,72 122,54 22,88
15,11 163,46 160,28 66,54
7,72 124,26 121,08 25,13
15,88 161,92 158,74 69,63
9,17 121,36 118,18 29,52
17,45 158,78 155,60 75,84
10,54 118,62 115,44 33,57
19,05 155,58 152,40 87,04
12,70 114,30 111,12 39,78
139,70
14,27 111,16 107,98 44,14 15,11 166,63 163,45 67,72
196,85
d
15,88 107,94 104,76 48,49 15,11 166,63 165,10 67,72
17,45 104,80 101,62 52,61
6,71 205,66 202,48 35,14
19,05 101,60 98,42 56,68
7,72 203,64 200,46 40,24
20,62 96,46 95,28 60,55
8,94 201,20 198,02 46,33
22,23 95,24 92,06 64,40 d
8,94 201,20 200,02 46,33
219,08
7,32 153,64 150,46 29,06
...