ISO 8535-1:2011

INTERNATIONAL ISO
STANDARD 8535-1
Fifth edition
2011-12-01
Diesel engines — Steel tubes for high-
pressure fuel injection pipes —
Part 1:
Requirements for seamless cold-drawn
single-wall tubes
Moteurs diesels — Tubes en acier pour lignes d’injection de
combustible à haute pression —
Partie 1: Exigences pour les tubes monoparoi sans soudure étirés à froid
Reference number
ISO 8535-1:2011(E)
©
ISO 2011

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ISO 8535-1:2011(E)
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ii © ISO 2011 – All rights reserved

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ISO 8535-1:2011(E)
Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Dimensions and tolerances . 1
3.1 Diameters . 1
3.2 Length . 2
4 Material processing . 2
4.1 Steel manufacturing process . 2
4.2 Manufacturing of tubes . 2
4.3 Surface quality . 4
4.4 Surface finish . 4
4.5 Minimum mechanical properties of tubes . 5
4.6 Cleanliness . 5
4.7 Straightness . 5
4.8 Corrosion resistance . 5
5 Testing . 5
5.1 General . 5
5.2 Scope of tests . 5
5.3 Dimension tests . 5
5.4 Mechanical-property tests . 6
5.5 Bending test . 6
5.6 Cold upsetting of tubes . 6
5.7 Surface quality test . 6
5.8 Inside pressure test . 6
5.9 Retesting . 6
5.10 Test certificate . 7
6 Designation . 7
7 Identification and marking . 8
8 Packing . 8
Annex A (informative) Theoretical maximum pressure for inside pressure testing . 9
Bibliography .10
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ISO 8535-1:2011(E)
iv © ISO 2011 – All rights reserved

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ISO 8535-1:2011(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 8535-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 7, Injection
equipment and filters for use on road vehicles.
This fifth edition cancels and replaces the fourth edition (ISO 8535-1:2006), which has been technically revised.
ISO 8535 consists of the following parts, under the general title Diesel engines — Steel tubes for high-pressure
fuel injection pipes:
— Part 1: Requirements for seamless cold-drawn single-wall tubes
— Part 2: Requirements for composite tubes
NOTE The first part of the general title, “Diesel engines”, is used for Part 1 only; for Part 2 “Compression-ignition
engines” is still used but will be replaced at the next revision.
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INTERNATIONAL STANDARD ISO 8535-1:2011(E)
Diesel engines — Steel tubes for high-pressure fuel injection
pipes —
Part 1:
Requirements for seamless cold-drawn single-wall tubes
1 Scope
This part of ISO 8535 specifies dimensions and requirements for seamless cold-drawn single-wall steel tubes
for high-pressure fuel injection pipes used on diesel (compression-ignition) engines (class 2) and for fuel
injection pump testing (class 1).
It applies to diesel (compression-ignition) engines.
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 404, Steel and steel products — General technical delivery requirements
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 12345, Diesel engines — Cleanliness assessment of fuel injection equipment
3 Dimensions and tolerances
3.1 Diameters
Recommended inside and outside diameters are given in Table 1. Other sizes may be used by agreement
between supplier and customer.
Tolerances on inside and outside diameters shall be as follows:
a) Inside diameter, d
d ≤ 4 mm: ± 0,05 mm for class 2
1)
± 0,025 mm for class 1
d > 4 mm: ± 0,10 mm.
NOTE Classes 1 and 2 are explained in Clause 1.
1) These tolerances are in accordance with ISO 4093.
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ISO 8535-1:2011(E)
b) Outside diameter, D
D < 8 mm: ± 0,06 mm
D ≥ 8 mm: ± 0,10 mm
for classes 1 and 2.
c) The maximum value of the concentricity of the tube outside diameter relative to the inside diameter shall
be proportional to the wall thickness, as shown in Figure 1.
Concentricity of the tube outside diameter
3.2 Length
Length and tolerances on length shall be by agreement between supplier and customer.
4 Material processing
4.1 Steel manufacturing process
The tubes shall be manufactured from unalloyed quality steel or an equivalent quality steel produced by a steel-
making process that ensures a very homogeneous structure.
If requested by the customer, the supplier shall state the method of manufacture and the deoxidation process used.
4.2 Manufacturing of tubes
The final reduction(s) of the tube shall be followed by heat treatment to achieve the specified mechanical properties.
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ISO 8535-1:2011(E)
Recommended inside and outside diameters (in millimetres)
a
Inside diameter (d) Outside diameter (D)
 4 5
Preferred 4,5 6 6,35 7 8 9 10 12 15 19 24 30
1

1,12
1,25
1,4

1,5
1,6
1,7

1,8
1,9
2
Size combinations to be used
2,12
appear in shaded cells
2,24
2,36

2,5
2,65
...