ISO 10799-1:2011

INTERNATIONAL ISO
STANDARD 10799-1
First edition
2011-09-15

Cold-formed welded structural hollow
sections of non-alloy and fine grain
steels —
Part 1:
Technical delivery conditions
Profils creux de construction formés à froid, soudés, en acier non allié
ou à grains fins —
Partie 1: Conditions techniques de livraison




Reference number
ISO 10799-1:2011(E)
©
ISO 2011

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ISO 10799-1:2011(E)

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ISO 10799-1:2011(E)
Contents Page
Foreword . iv
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 2
4  Classification and designation . 3
4.1  Classification . 3
4.2  Designation . 3
5  Information to be supplied by the purchaser . 4
5.1  Mandatory information . 4
5.2  Options . 5
5.3  Example . 5
6  Requirements . 6
6.1  General . 6
6.2  Steel manufacturing process . 6
6.3  Condition of feedstock material . 6
6.4  Structural hollow section manufacturing process . 6
6.5  Delivery conditions . 6
6.6  Chemical composition . 6
6.7  Mechanical properties . 8
6.8  Technological properties . 8
6.9  Surface condition . 9
6.10  Non-destructive testing of welds . 9
6.11  Tolerances and mass . 10
7  Inspection . 10
7.1  Types of inspection and testing . 10
7.2  Types of inspection documentation . 10
7.3  Inspection and testing . 11
8  Samples . 13
8.1  Frequency of tests . 13
8.2  Preparation of samples and test pieces . 14
9  Test methods . 15
9.1  Chemical analysis . 15
9.2  Mechanical tests . 15
9.3  Visual examination and dimensional inspection . 16
9.4  Non-destructive testing of welding . 16
9.5  Retests, sorting and reprocessing . 17
10  Marking . 17
Annex A (normative) Structural hollow sections of non-alloy steels — Chemical composition and
mechanical properties . 18
Annex B (normative) Structural hollow sections of fine grain steels — Chemical composition and
mechanical properties . 20
Annex C (normative) Location of samples and test pieces . 23
Bibliography . 26

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ISO 10799-1:2011(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 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10799-1 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings,
Subcommittee SC 1, Steel tubes.
This first edition of ISO 10799-1 cancels and replaces ISO 10799:2001, of which it constitutes a minor revision.
In particular, better grouping of several documents by subject area and minor editorial improvements have
been carried out.
ISO 10799 consists of the following parts, under the general title Cold-formed welded structural hollow
sections of non-alloy and fine grain steels:
 Part 1: Technical delivery conditions
 Part 2: Dimensions and sectional properties

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INTERNATIONAL STANDARD ISO 10799-1:2011(E)

Cold-formed welded structural hollow sections of non-alloy and
fine grain steels —
Part 1:
Technical delivery conditions
1 Scope
This part of ISO 10799 specifies the technical delivery requirements for cold-formed welded structural hollow
sections of circular, square or rectangular form. It is applicable to structural hollow sections formed cold
without subsequent heat treatment.
The grades, chemical composition and mechanical properties for non-alloy steels and fine grain steels are
given in Annexes A and B, respectively.
NOTE 1 For the requirements for tolerances, dimensions and sectional properties, see ISO 10799-2.
NOTE 2 For hot finished structural hollow sections, see ISO 12633-1.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
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 apparent grain size
ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 6892-2, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature
ISO 9606-1, Qualification testing of welders — Fusion welding — Part 1: Steels
ISO 10474:1991, Steel and steel products — Inspection documents
ISO 10799-2, Cold-formed welded structural hollow sections of non-alloy and fine grain steels — Part 2:
Dimensions and sectional properties
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ISO 10799-1:2011(E)
ISO 10893-2, Non-destructive testing of steel tubes — Part 2: Automated eddy current testing of seamless
and welded (except submerged arc-welded) steel tubes for the detection of imperfections
ISO 10893-3, Non-destructive testing of steel tubes — Part 3: Automated full peripheral flux leakage testing of
seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of
longitudinal and/or transverse imperfections
ISO 10893-6, Non-destructive testing of steel tubes — Part 6: Radiographic testing of the weld seam of
welded steel tubes for the detection of imperfections
ISO 10893-11, Non-destructive testing of steel tubes — Part 11: Automated ultrasonic testing of the weld
seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition
ISO 15607, Specification and qualification of welding procedures for metallic materials — General rules
ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc welding
ISO 15614-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
tube
hollow long product open at both ends of any cross-sectional shape
3.2
structural hollow section
tube intended to be used for structural purposes
3.3
normalizing rolling
rolling process in which the final deformation is carried out in a certain temperature range leading to a material
condition equivalent to that obtained after normalizing so that the specified values of the mechanical
properties are retained even after normalizing
3.4
cold forming
process in which the main forming is carried out at ambient temperature
3.5
thermomechanical rolling
rolling process in which the final deformation is carried out in a certain temperature range leading to a material
condition with certain properties which cannot be achieved or repeated by heat treatment alone
NOTE 1 Subsequent heating above 580 °C may lower the strength values.
NOTE 2 Thermomechanical rolling leading to the delivery condition M can include processes with an increasing cooling
rate with or without tempering including self-tempering, but excluding direct quenching and quenching and tempering.
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ISO 10799-1:2011(E)
4 Classification and designation
4.1 Classification
4.1.1 Within the steel grades of the non-alloy steels given in Annex A, three qualities JR, J0 and J2 are
specified. These qualities differ in respect of specified impact requirements, and limits on values of various
elements, with particular reference to sulfur and phosphorus, and inspection and testing requirements.
4.1.2 Within the steel grades of the fine grain steels given in Annex B, four qualities, N, NL, M and ML, are
specified. These differ in respect of the carbon, sulfur and phosphorus content and low-temperature impact
properties.
4.2 Designation
4.2.1 For non-alloy steel structural hollow sections, the steel designation consists of:
 a reference to this part of ISO 10799, i.e. ISO 10799-1:2011;
 the capital letter S for structural steel;
 the indication of the minimum specified yield strength for thicknesses  16 mm, expressed in newtons per
2
square millimetre (N/mm );
 the capital letters JR for the qualities with specified impact properties at room temperature;
 the capital letter J and a number 0 or 2 for the qualities with specified impact properties at 0 °C and
20 °C respectively;
 the capital letter H to indicate hollow sections.
4.2.2 For fine grain steel structural hollow sections, the steel designation consists of:
 a reference to this part of ISO 10799, i.e. ISO 10799-1:2011;
 the capital letter S for structural steel;
 the indication of the minimum specified yield strength for thicknesses  16 mm, expressed in newtons per
2
square millimetre (N/mm );
 the capital letter N to indicate normalized or normalized rolled feedstock material (see 6.3);
 the capital letter M to indicate thermomechanically rolled feedstock material (see 6.3);
 the capital letter L for the qualities with specified minimum values of impact energy at a temperature of
50 °C;
 the capital letter H to indicate hollow sections.
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ISO 10799-1:2011(E)
4.2.3 The product shall be designated as illustrated by the following examples:
EXAMPLE 1
ISO 10799-1 S 275 JO H
Number of this part of ISO 10799
Structural steel
2
Minimum yield strength (N/mm ) for thickness ≤ 16 mm
Impact properties, 27 J min. at 0 °C
Hollow section

EXAMPLE 2
ISO 10799-1 S 355 NL H
Number of this part of ISO 10799
Structural steel
2
Minimum yield strength (N/mm ) for thickness ≤ 16 mm
Normalized fine-grain steel with impact properties, 27 J min. at −50 °C
Hollow section

5 Information to be supplied by the purchaser
5.1 Mandatory information
The following information shall be supplied by the purchaser at the time of enquiry and order:
a) the quantity (mass or total length or number);
b) the type of length and length range or length (see ISO 10799-2);
c) details of the product form:
CFCHS = cold-formed welded circular hollow section;
CFRHS = cold-formed welded square or rectangular hollow section;
d) the steel designation (see 4.2);
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ISO 10799-1:2011(E)
e) the dimensions (see ISO 10799-2);
f) the options required (see 5.2);
g) the type of inspection document required (see 7.2 and Tables 2 and 3).
5.2 Options
A number of options are specified in this part of ISO 10799; they are listed in this subclause with the
appropriate subclause references. In the event that the purchaser does not indicate his/her wish to implement
any of these options at the time of enquiry and order, the products shall be supplied in accordance with the
basic specification (see 5.1).
a) Option 1: product analysis shall be carried out (see 6.6.1).
b) Option 2: a maximum carbon equivalent value (CEV) in accordance with Table A.2 shall be provided for
non-alloy grades (see 6.6.2).
c) Option 3: the Cr, Cu, Mo, Ni, Ti and V cast analysis contents shall be reported in the inspection certificate
or inspection report for non-alloy grades (see 6.6.2).
d) Option 4: a maximum CEV in accordance with Table B.3 shall be provided for fine grain steels S275,
S355 and S420 (see 6.6.3).
e) Option 5: the cast analysis limits for grade S460 (see 6.6.3) shall be
1) V + Nb + Ti  0,22 %, and
2) Mo + Cr  0,30 %.
f) Option 6: impact properties of quality J0 and JR shall be verified. This option applies only when products
are ordered with specific inspection and testing (see 6.7.4).
g) Option 7: the material shall be suitable for hot dip galvanized coating (see 6.8.2).
h) Option 8: weld repairs to the body of non-alloy structural steel hollow sections shall not be permitted
(see 6.9.4).
i) Option 9: specific inspection and testing for non-alloy grades of qualities JR and J0 shall be applied
(see 7.1.1).
5.3 Example
12-10
random
ISO 10799-1 S355NH- 100 x 100 x 8- Options 1, 4 : 3.1 B
9 t lengths CFRHS-
Quantity and type of length (see ISO 10799-2)
Product form
Number of this part of ISO 10799
Steel grade
Size and thickness (see ISO 10799-2)
Options 1 and 4 from this part of ISO 10799
Type of inspection document selected from ISO 10474

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ISO 10799-1:2011(E)
6 Requirements
6.1 General
Structural hollow sections of non-alloy steels shall comply with the requirements of Annex A; structural hollow
sections of fine grain steels shall comply with the requirements of Annex B.
6.2 Steel manufacturing process
6.2.1 The steel manufacturing process shall be at the discretion of the steel producer.
6.2.2 For the non-alloy structural steels given in Annex A, the method of deoxidation shall be as given in
Table A.1.
6.2.3 For the fine grain steels given in Annex B, the method of deoxidation shall be as given in Table B.1 or
Table B.2.
6.2.4 The fine grain steels given in Annex B shall have a ferritic grain size equal to or finer than 6 when
measured in accordance with ISO 643 (see 6.7.3).
6.3 Condition of feedstock material
According to the designation given in the order, the following delivery conditions apply for the feedstock
material used for the manufacture of cold-formed hollow sections:
 as rolled or normalized/normalized rolled (N) for steels of qualities JR, J0 and J2 according to Annex A;
 normalized/normalized rolled (N) for steels of qualities N and NL according to Annex B;
 thermomechanically rolled (M) for steels of quality M and ML according to Annex B.
6.4 Structural hollow section manufacturing process
6.4.1 Structural hollow sections shall be manufactured by electric welding or submerged arc welding without
subsequent heat treatment (see 6.5.1). Hollow sections manufactured by a continuous process shall not
include welds used for joining lengths of the flat-rolled strip prior to forming the hollow section, except that for
helically welded submerged arc-welded hollow sections such welds shall be permitted when tested in
accordance with 9.4.3.
6.4.2 Electric welded hollow sections are normally supplied without trimming the internal weld bead.
6.4.3 For quality assurance requirements, see ISO 404. If the purchaser specifies quality assurance, an
appropriate International Standard, such as ISO 9001, can be used.
6.5 Delivery conditions
6.5.1 The hollow sections shall be delivered cold formed without subsequent heat treatment except that the
weld seam may be in the as welded or heat treated condition.
NOTE For submerged arc welded hollow sections above 508 mm outside diameter, it can be necessary to perform a
warm shaping operation, which does not affect the mechanical properties, in order to meet the out-of-roundness tolerance
requirements.
6.6 Chemical composition
6.6.1 The cast analysis reported by the steel producer shall apply and shall comply with the requirements of
Table A.1 or Table B.1 or B.2.
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ISO 10799-1:2011(E)
Option 1 (see 5.2): a product analysis shall be carried out for hollow sections supplied with specific inspection
and testing.
The permissible deviations of the product analysis from the specified limits cast analysis are given in Table 1.
When a CEV is required, it shall be determined from the cast analysis using the formula:
Mn CrMo V Ni Cu
CEVC  
65 15
6.6.2 For non-alloy steel products, the following additional requirements may be requested at the time of
enquiry and order for products supplied with specific inspection and testing (see 7.1).
Option 2 (see 5.2): the CEV in accordance with Table A.2.
Option 3 (see 5.2): the recording on the inspection certificate or inspection report of the Cr, Cu, Mo, Ni, Ti and
V content (cast analysis).
Table 1 — Permissible deviations of the product analysis from the specified limits of the cast analysis
given in Tables A.1, B.1 and B.2
Permissible limiting content in the cast Permissible deviation of the product analysis from
analysis specified limits for the cast analysis
Element
mass fraction mass fraction
% %
a
C   0,20 +0,02
  0,20 +0,03
Si  0,60 +0,05
non-alloy  1,60 +0,10
0,05
Mn fine grain  1,70

0,10
P non-alloy  0,045 +0,010
fine grain  0,035 +0,005
S non-alloy  0,045 +0,010
fine grain  0,030 +0,005
Nb  0,050 +0,010
V  0,20 +0,02
Ti  0,05 +0,01
Cr  0,30 +0,05
Ni  0,80 +0,05
Mo  0,20 +0,03
Cu  0,35 +0,04
 0,35  Cu  0,70 +0,07
N  0,025 +0,002
Al  0,020 0,005
Total
a
For S235JRH for thicknesses less than or equal to 16 mm, the permissible deviation is +0,04 % C, and for thicknesses greater than
16 mm and less than or equal to 40 mm, the permissible deviation is +0,05 % C.

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ISO 10799-1:2011(E)
6.6.3 For fine grain steel hollow sections, the following additional requirements may be requested at the
time of enquiry and order.
Option 4 (see 5.2): the CEV for steel grades S275, S355 and S420 in accordance with Table B.3.
Option 5 (see 5.2): for steel grade S460, the following limits for the cast analysis:
V + Nb + Ti  0,22 % and Mo + Cr  0,30 %.
A maximum CEV may be agreed between the purchaser and manufacturer as an alternative to option 5.
6.7 Mechanical properties
6.7.1 Under the inspection and testing conditions as specified in Clause 7 and in the delivery condition as
specified in 6.5, the mechanical properties shall comply with the relevant requirements of Tables A.3, B.4
and B.5.
Stress relief annealing at more than 580 °C or for over 1 h can lead to deterioration of the mechanical
properties. If the purchaser intends to stress relief anneal the products at higher temperatures or for longer
times, the minimum values of the mechanical properties after such a treatment should be agreed at the time of
the enquiry and order.
6.7.2 For impact tests, standard V-notch test pieces (see ISO 148-1) shall be used. If the nominal product
thickness is not sufficient for the preparation of standard test pieces, the test shall be carried out using test
pieces of width less than 10 mm, but not less than 5 mm. The minimum average values given in Tables A.3,
B.4 and B.5 shall be reduced in direct proportion of the actual width of the test piece to that of the standard
test piece.
Impact tests are not required for nominal thickness less than 6 mm.
6.7.3 For fine grain steel hollow sections in thicknesses that do not permit test pieces of width greater than
or equal to 5 mm to be taken, the ferritic grain size (see 6.2.4) shall be verified by the method specified in
ISO 643.
When aluminium is used as the grain refining element, the grain size requirement shall be deemed to be
fulfilled if the cast analysis shows the aluminium content to be not less than 0,020 % total aluminium or
alternatively 0,015 % soluble aluminium. In these cases, verification of the grain size is not required.
6.7.4 Subject to the limitations of 6.7.2:
a) the impact properties of structural hollow sections of steel qualities J2, M, N, ML and NL shall be verified;
b) the impact properties of structural hollow sections of steel qualities JR and J0 are not verified.
Option 6 (see 5.2): the purchaser may request at the time of enquiry and order, for products supplied with
specific inspection and testing (see option 9), that the impact properties of steel qualities JR and J0 be verified.
6.8 Technological properties
6.8.1 Weldability
The steels specified in this part of ISO 10799 shall be suitable for welding by all appropriate welding
processes.
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ISO 10799-1:2011(E)
NOTE 1 With increasing product thickness, increasing strength level and increasing carbon equivalent level, the
occurrence of cold cracking in the welded zone forms the main risk. Cold cracking is caused by the following factors in
combination:
 the amount of diffusible hydrogen in the weld metal;
 a brittle structure of the heat-affected zone;
 significant tensile stress concentrations in the welded joint.
NOTE 2 When following recommendations laid down in any relevant standard, the welding conditions and various
welding ranges of the steel grades can be determined according to the product thickness, applied welding energy, the
design requirements, electrode efficiency, welding process and weld metal properties.
6.8.2 Hot dip galvanized coating
Option 7 (see 5.2): at the time of enquiry and order, the purchaser may request that the products be suitable
for hot dip galvanized coating.
6.9 Surface condition
6.9.1 The hollow sections shall have a smooth surface corresponding to the manufacturing method used;
however, bumps, cavities or shallow longitudinal grooves resulting from the manufacturing process are
permissible, provided the remaining thickness is within tolerance.
Surface defects may be removed by the manufacturer by grinding, provided the thickness of the hollow
section after the repair is not less than the minimum permissible thickness. (See ISO 10799-2 for thickness
tolerance.)
6.9.2 The ends of the hollow section shall be cut nominally square with the axis of the product.
6.9.3 For both non-alloy and fine-grain steel structural hollow sections, repair of the weld shall require
authorization.
6.9.4 For non-alloy structural hollow sections, repair of the body by welding shall be permitted unless
otherwise specified. The conditions under which, and the extent to which, welding repair to the body may be
carried out shall be agreed between the manufacturer and the purchaser.
Option 8 (see 5.2): the purchaser may specify at the time of enquiry and order that repair of the body by
welding not be carried out.
For fine grain structural steel hollow sections, repair of the body by welding shall not be permitted unless
otherwise agreed.
6.9.5 Welding repair shall be carried out by operators qualified in accordance with ISO 9606-1. Welding
repair procedures shall be in accordance with ISO 15607, ISO 15609-1 and ISO 15614-1. The repair welding
procedures shall be covered by the manufacturer's quality assurance system.
6.9.6 The repaired hollow section shall comply with all the requirements of this part of ISO 10799.
6.10 Non-destructive testing of welds
The seam weld of all hollow sections supplied with specific inspection and testing shall be subjected to a
non-destructive test (NDT) (see 9.4).
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