ISO 8535-2:2003

Compression-ignition engines — Steel tubes for high-pressure fuel injection pipes — Part 2: Requirements for composite tubes

ISO 8535-2:2003 specifies the dimensions and gives requirements for composite steel tubes for high-pressure fuel injection pipes used on diesel (compression-ignition) engines (Class 2) and for fuel injection pump testing (Class 1).

Moteurs à allumage par compression — Tubes en acier pour lignes d'injection à haute pression — Partie 2: Caractéristiques des tubes composites

General Information

• Status: Published
• Publication Date: 22-Sep-2003
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
• Drafting Committee: ISO/TC 22/SC 34/WG 2 - Injection equipment
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 13-Sep-2019

Relations

• Revises: ISO 8535-2:1993 - Compression-ignition engines — Steel tubes for high-pressure fuel injection pipes — Part 2: Requirements for composite tubes
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 8535-2
Second edition
2003-10-01

Compression-ignition engines — Steel
tubes for high-pressure fuel injection
pipes —
Part 2:
Requirements for composite tubes
Moteurs à allumage par compression — Tubes en acier pour lignes
d'injection à haute pression —
Partie 2: Caractéristiques des tubes composites




Reference number
ISO 8535-2:2003(E)
©
ISO 2003

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ISO 8535-2:2003(E)
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ii © ISO 2003 — All rights reserved

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ISO 8535-2:2003(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references . 1
3 Dimensions and tolerances . 1
4 Material processing . 3
5 Testing. 5
6 Designation. 7
7 Identification and marking . 8
8 Packing. 8
Bibliography . 9

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ISO 8535-2:2003(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 8535-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 7, Injection
equipment and filters for use on road vehicles.
This second edition cancels and replaces the first edition (ISO 8535-2:1993), which has been technically
revised.
ISO 8535 consists of the following parts, under the general title Compression-ignition 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

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INTERNATIONAL STANDARD ISO 8535-2:2003(E)

Compression-ignition engines — Steel tubes for high-pressure
fuel injection pipes —
Part 2:
Requirements for composite tubes
1 Scope
This part of ISO 8535 specifies the dimensions of, and gives requirements for, composite steel tubes for high-
pressure fuel injection pipes used on diesel (compression-ignition) engines (Class 2) and for fuel injection
pump testing (Class 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 404, Steel and steel products — General technical delivery requirements
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6892, Metallic materials — Tensile testing
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 purchaser.
Tolerances on inside and outside diameters shall be as follows.
a) Inside diameter, d
± 0,05 mm for Class 2
1)
± 0,025 mm for Class 1
b) Outside diameter, D
± 0,06 mm for Classes 1 and 2

1) Tolerance in accordance with ISO 4093.
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ISO 8535-2:2003(E)
c) Concentricity of the tube outside diameter relative to the inside diameter shall be proportional to the wall
thickness, as shown in Figure 1.
3.2 Length
Length and tolerances on length shall be by agreement between supplier and purchaser.
Table 1 — Recommended inside and outside diameters
Dimensions in millimetres
a b
Inside diameter fin Outside diameter fin
d D
Preferred Non-preferred 4,5 6 7
1,12
1,25
1,4
1,5
1,6
1,7
1,8
1,9
2
2,12
2,24
2,36
2,5
2,65
2,8
3
3,15
3,35
NOTE The diameter sizes have been established with the ratio of outside to inside diameter within the range of 2 to 4.
a
Based on ISO 3.
b
Size combinations to be used are those falling within the cross-hatched region.

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ISO 8535-2:2003(E)

Figure 1 — Tube diameters
4 Material processing
4.1 Steel manufacturing process
The tubes shall be manufactured from an unalloyed quality steel or an equivalent quality steel produced by a
steel-making process that ensures a very homogeneous structure.
The composite structure can be produced in various ways:
 a seamless inner (liner) tube is indicated by “CA”;
 a seamed inner tube is indicated by “CB”.
4.2 Surface quality
4.2.1 General
The outside and inside surfaces of finished tubes shall be free from scale, rust, grooves, laps, laminations,
deep pits or other injurious defects.
4.2.2 Minimum surface quality of bore (Grade S)
The inside of the tubes of bore Grade S shall be finished to ensure a smooth bore of accurate size with no
more than five imperfections (fissures, crevices, etc.) over 0,08 mm to 0,13 mm maximum depth per tube
cross-section, using 50× magnification for examination (see Table 2). This does not apply to tube type CB.
4.2.3 Higher surface quality of bore (Grades O, P, Q and R)
If closer control over the depth of imperfections is required, bore grades O, P, Q or R, assessed under the
magnification indicated (see Table 2), may be specified in the tube designation (see Clause 6). This does not
apply to tube type CB.
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ISO 8535-2:2003(E)
Table 2 — Bore grade
...