EN 10270-2-2008 pdf download.Steel wire for mechanical springs – Part 2 : Oil hardened and tempered spring steel wire.
1.1 This Part of EN 10270 applies to od hardened and tempered spring steel wire made train unalloyed or alloyed steels They are primarily subject to torsional stresses such as en compression and extension springs and in specia cases also for applications where the spring wire is subject to bending stresses such as lever springs
As a rule unalloyed steels are used for applications at room temperature whereas alloyed steels are generally used at a temperature above room temperature Alloyed steels may also be chosen for above average tensile strengThs
1.2 In addition to this part of EN 10270 the general technical delivery requirements of EN 10021 are appIicale
2 Normative references
Th. following referenced documents are indispensable fai the application of this document For dated references only the edition cited applies For undated references, the latest edition of the referenced oocument (anduding any amendments) applies
EN 10002-1, Metallic materials — T.nssfe test — Pail I Method 01 test at ambient temperature
EN 10021 General technical delivery requirements for steel products
EN 10204 Metallic products — Types of inspect ion documents
EN 10218-1. Steel wire and wwa products— General— Pail I Test methods
EN 10218-2. Steel wire and wwe products — General— Pen 2. Wire dimensions and tolerances
ENV 10247, Micrographic examination of the non-metallic inclusion content of steals using standard pictures
CR 10281, Iron and steel — Review of avadable methods of chemical analysis
EN ISO 377. Steel and steel products — Location and preparation of samples and test pieces for mechanical tasting
EN ISO 14284, St..l and iron — Sampling and preparation of samples foe’ the determination of chemical composition (iSO 14284 1996)
EN ISO 3887. Steels — Detemunation of depth of decarbunzation
3 Terms and definitions
For the purposes of this document, the following terms arid detneteons apply
3.1
oil hardened and tempered spring steel wir
wwe ttiat I heat treated U me n the follOwing way It ii first transformed into austenite. quenched in oil or similar quenching medium followed immediately by tempering by heating to the appropriate temperature
4 Classification and designation
4.1 ClassificatIon
This standard deals wstl all types of hardened and tempered spring steel wire The grade for normal applications made from unalloyed or alloyed steel has the abbreviation FD and is intended for static applications
Spring steel wire for medium fatigue levels such as required for some clutch springs from unalloyd or alloyed steel has the abbreviation TO
Spnng steel wire from unaNoyed steel or alloyed steel intndad for use under severe dynamic duty such as for valve spnngs or other springs with similar requirements has the abbreviation VD
The diameter ranges for the various wire grades are shown in Table 1
Medium and high fatigue grades TD and VD are characterized by high steel cleanhness specific chemical mechanical and technological parameters and a weH defined surface condibon in relabon to the allowable depth of surface defects and decarbunzatiorl
The static grade ED is charactenzed by its chemical. mechanical and technological charactenstics as well as by a specified surfac condrhon concerning surface defects and decarbunzation
4.2 Designation
For products supplied according to this standard the designation shall state the following in the following
order
– the term spring wire
– the number of this European Standard EN 10270-2. the abbreviation fr the wire grade (see Table 1)
the required nominal diameter selected from Table 4 or Table 5.
EXAMPLE Stanoar designation of an Od hardenel and tempered steel spring wire aocdg to this standard of *tr grade VDC with a nominal diameter of 250 mm
Spring wire EN 10270-2 . ‘ICC 2.50
b) the number of this European Standard EN 10270-2.
C) wire grade (see 4 1)
d) the nominal wire diameter
a) the form of delivery and unit mass
f) the type of inspection document
g) any particuLar agreement made
EXAMPLE StspnngmreENlO27O-2-VDC-250
in cods of about 300 kg
inspection document EN 10204 – 3 1 8
6 Requirements
6.1 Form of delivery
6.1.1 Oil hardened and tempered wire shall be suppLied in Coils Ofl spools or in cut lengths The wire in coiLs or on spools shall form one continuous length Wire in coil may also be suppled on camera containing one or more coiLs
For VD and TD grades no welds are permitted after the heat treatments preceding the tnal drawing operation, for FD grades no welds shall be made at finished size unless agreed otherwise between the parties
6.1.2 The supplied wire units shall be tightLy bound to ensure that wire spiral waps do not spring out unforeseen The starting end shall be marked and at the coil ends the wire shall be covered with a protective
6.2 Surface finish
The wire shall be protected against corrosion and mechanical damage Unless otherwise speofed the wire shall be delivered in slightLy oiled condition
6.3 Chemical composition
The steel is characterized by the heat analyse which Shall be ui accordance with the values of Table 2 The permissible deviation of the product analysis from the Iwnibng values of heat analysis shall be Wi accordance with Table 3.EN 10270-2-2008 pdf download.