EN 10270-1:2011/FprA1

Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel wire

1.1 This Eurpean Standard applies to patented cld drawn unalloyed steel wire of cicular cross-section for the manufacture of mechanical springs for static duty and dynamic duty applications - 1.2 In addition to this European Standard, the general technical delivery requirements of EN 10021 are applicable.

Stahldraht für Federn - Teil 1: Patentiert gezogener unlegierter Federstahldraht

Fils en acier pour ressorts mécaniques - Partie 1 : Fils pour ressorts en acier non allié, patentés, tréfilés à froid

Jeklena žica za vzmeti - 1. del: Patentirana hladno vlečena nelegirana jeklena žica za vzmeti

General Information

• Status: Not Published
• ICS: 77.140.25 - Spring steels
• Technical Committee: ECISS/TC 106 - Wire rod and wires
• Drafting Committee: ECISS/TC 106 - Wire rod and wires
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Start Date: 23-Feb-2017
• Due Date: 15-Jul-2015
• Completion Date: 23-Feb-2017
• Ref Project: SIST EN 10270-1:2012/kFprA1:2017 - Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel wire

Relations

• Merged Into: EN 10270-1:2011+A1:2017 - Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel wire
• Effective Date: 08-Mar-2017
• Amends: EN 10270-1:2011 - Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel wire
• Effective Date: 06-Nov-2013

Overview

EN 10270-1:2011/FprA1 - Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel wire (CEN) defines requirements for circular-section, patented cold-drawn unalloyed steel wire intended for the manufacture of mechanical springs for both static duty and dynamic duty applications. This draft amendment (FprA1) updates normative references, composition and mechanical-property tables, testing and sampling rules, dimensional tolerances, and marking/packaging provisions.

Key topics and technical requirements

• Scope: Applies to patented cold-drawn, unalloyed spring wire of circular cross-section for mechanical springs (static and dynamic).
• Steel grades & references: Specifies use of EN ISO 16120 parts for grade selection (SL/SM/SH per EN ISO 16120-2; DM/DH per EN ISO 16120-4) and EN ISO 16120-1 for general requirements.
• Chemical composition: Revised composition ranges for Si, C, Mn, P, S, Cu are defined (see amendment Table 1); manganese ranges may be agreed at order.
• Mechanical properties: Updated tensile strength, reduction of area rules (measured only for d > 0.80 mm), and modified strength ranges for specific size groups.
• Dimensional tolerances: Diameter tolerances aligned with EN 10218-2 and clarified tolerance bands (T5/T4/T3) based on wire diameter ranges.
• Mandatory tests & sampling: Extent of testing summarized (cast analysis, tensile, reduction of area, coiling, torsion, wrapping, bending, surface/decarburization checks). Table 10 (amendment) sets sampling frequencies and mandatory/optional tests.
• Test methods: Tensile tests at room temperature per EN ISO 6892-1; coating adherence (zinc/zinc‑aluminium) by wrapping test per EN 10244-2 for wire d ≤ 5 mm; several diameter-dependent test limits clarified (coiling, torsion, wrapping, bend).
• Surface & packaging: Surface-defect inspection and decarburization testing options for small diameters (d ≤ 2.00 mm) may be agreed at order; marking and packaging entries updated.

Applications and users

Who uses EN 10270-1:2011/FprA1:

• Spring manufacturers (automotive, industrial, precision components)
• Wire producers and drawing mills
• Quality and inspection laboratories
• Purchasing/specification engineers and product designers

Practical applications:

• Specification and procurement of spring wire for coil, tension, compression, and torsion springs used in dynamic and static load environments.
• Establishing test protocols, sampling plans and acceptance criteria during production and incoming inspection.
• Ensuring coating adherence and dimensional control for corrosion protection and fit.

Related standards

• EN 10021 (general technical delivery requirements)
• EN ISO 16120‑1/2/4 (spring steels)
• EN ISO 6892‑1 (tensile test)
• EN 10244‑2 (coating adherence test)
• EN 10218‑2 (wire dimensional tolerances)
• CEN/TR 10261 (chemical composition determination)

This standard is essential for consistent, auditable specification of patented cold drawn unalloyed spring steel wire and for ensuring reliable performance of mechanical springs.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2017
-HNOHQDåLFD]DY]PHWLGHO3DWHQWLUDQDKODGQRYOHþHQDQHOHJLUDQDMHNOHQDåLFD
]DY]PHWL
Steel wire for mechanical springs - Part 1: Patented cold drawn unalloyed spring steel
wire
Stahldraht für Federn - Teil 1: Patentiert gezogener unlegierter Federstahldraht
Fils en acier pour ressorts mécaniques - Partie 1 : Fils pour ressorts en acier non allié,
patentés, tréfilés à froid
Ta slovenski standard je istoveten z: EN 10270-1:2011/FprA1
ICS:
77.140.25 Vzmetna jekla Spring steels
77.140.65 Jeklene žice, jeklene vrvi in Steel wire, wire ropes and
verige link chains
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

FINAL DRAFT
EUROPEAN STANDARD
EN 10270-1:2011
NORME EUROPÉENNE
EUROPÄISCHE NORM
FprA1
December 2016
ICS 77.140.25
English Version
Steel wire for mechanical springs - Part 1: Patented cold
drawn unalloyed spring steel wire
Fils en acier pour ressorts mécaniques - Partie 1 : Fils Stahldraht für Federn - Teil 1: Patentiert gezogener
pour ressorts en acier non allié, patentés, tréfilés à unlegierter Federstahldraht
froid
This draft amendment is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical
Committee ECISS/TC 106.
This draft amendment A1, if approved, will modify the European Standard EN 10270-1:2011. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.

This draft amendment was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10270-1:2011/FprA1:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modifications to Clause 2, Normative references . 4
2 Modification to Clause 3, Terms and definitions . 4
3 Modification to Clause 4, Classification . 4
4 Modification to Clause 5,-Information to be supplied by the purchaser . 4
5 Modification to 6.1.1, General . 4
6 Modifications to 6.1.2, Chemical composition . 4
7 Modification to 6.4, Mechanical properties . 5
8 Modifications to 6.4, Mechanical properties . 5
9 Modification to 6.5.1, Coiling test . 6
10 Modifications to 6.5.2, Simple torsion test . 6
11 Modification to 6.5.3, Wrapping test . 6
12 Modification to 6.5.4, Simple bend test . 6
13 Modifications to 6.6.2, Coil size . 6
14 Modification to 6.6.4, Helix cast of wire . 7
15 Modifications to 6.8.1, Dimensional tolerances . 7
16 Modification to 7.4.2, Tensile test. 7
17 Modifications to 7.4.6, Simple bend test . 7
18 Modification to 7.4.7, Surface defects . 7
19 Modification to 7.4.8, Decarburization . 8
20 Modification to 7.4.9, Diameter . 8
21 Modifications to 7.4.11, Adherence of coating . 8
22 Modification to Clause 8, Marking and packaging . 8
23 Modification to A.4, Tensile strength formula .11

European foreword
This document (EN 10270-1:2011/FprA1:2016) has been prepared by Technical Committee
ECISS/TC 106 “Wire rod and wires”, the secretariat of which is held by AFNOR.
This document is currently submitted to the Unique Acceptance Procedure.
1 Modifications to Clause 2, Normative references
Replace the whole reference to CEN/TR 10261 with:
"CEN/TR 10261, Iron and steel — European standards for the determination of chemical composition".
At the end of the title of EN ISO 377, replace “(ISO 377:1997)” with “(ISO 377:2013, Corrected version
2015-06-01)”.
2 Modification to Clause 3, Terms and definitions
In the first sentence, replace “terms and definitions” with “term and definition”.
3 Modification to Clause 4, Classification
At the end of the first paragraph, replace “Low” with “low”.
4 Modification to Clause 5,-Information to be supplied by the purchaser
At the end of List Item h), add “(see 7.1)”.
5 Modification to 6.1.1, General
Replace the whole content of this subclause with:
"Steel spring wire shall be made from steel grades according to:
— for SL, SM and SH EN ISO 16120-2
— for DM and DH EN ISO 16120-4
For general requirements EN ISO 16120-1 apply.".
6 Modifications to 6.1.2, Chemical composition
Replace Table 2 with the following table (in which “max” moves from the table header to each row for P, S
b c b
and Cu; footnote is deleted and footnote becomes footnote ):
"
Table 1 — Chemical composition, % by mass
a
b
Grade Si P S Cu
Mn
C
SL, SM, SH 0,35 to 1,00 0,10 to 0,30 0,40 to 1,20 0,035 0,035 0,20
max. max. max.
DM, DH 0,45 to 1,00 0,10 to 0,30 0,40 to 1,20 0,020 0,025 0,12
max. max. max.
a
Such a wide range is stipulated to accommodate the whole range of sizes. For individual sizes the carbon range is
substantially more restricted.
b
For the manganese content, a different range from the one indicated in the table may be agreed at the time of ordering,

with a maximum not exceeding 1,20 % and with a minimum range of 0,20 %.
".
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