|Form:||Wires||Surface Condition:||Black And Light Oiled|
|FROM:||Wires||STANDARD:||BS EN 10270-2|
|Classification:||Oil Tempered Spring Steel Wire|
Spring Steel Wire BS EN 10270-2,
54sicr6 spring steel,
oil hardened and tempered spring steel wire that is heat treated in line in the following way: it is first transformed into austenite, quenched in oil or similar quenching medium, followed immediately by tempering by heating to the appropriate temperature.
oil hardened and tempered spring steel wire made from unalloyed or alloyed steels. They are primarily subject to torsional stresses such as in compression and extension springs and in special 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.
|Grade||C||Si||Mn||P max.||S max.||Cu max.||Cr||V|
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 unailoyed or alloyed steel, has the abbreviation TD.
Spring steel wire from unalloyed steel or alloyed steel intended for use under severe dynamic duty such as for valve springs or other springs with similar requirements has the abbreviation VD.
Medium and high fatigue grades TD and VD are characterized by high steel cleanliness, specific chemical, mechanical and technological parameters and a well defined surface condition in relation to the allowable depth of surface defects and decarburization.
The static grade FD is characterized by its chemical, mechanical and technological characteristics as well as by a specified surface condition concerning surface defects and decarburization.
Wire in coils
The tolerances level for the wire diameter is based on EN 10218-2:1996 level:
-T5 for wire diameter up to and including 0,80 mm;
-T4 for 0,80 mm up to 10,00 mm;
-T3 above 10,00 mm.
Wire in cut lengths
The requirements for length tolerances and straightness are as in EN 10218-2:1996. The tolerance on the nominal length shall only be in plus keeping the same tolerance range
The VD grades shall be checked for maximum size of inclusion according to ENV 10247. The allowable level of inclusions shall be agreed between the parties at the enquiry and order.
Oil hardened and tempered wire shall be supplied in coils, on spools or in cut lengths. The wire in coils or on spools shall form one continuous length. Wire in coil may also be supplied on carriers containing one or more coils.
For VD and TD grades no welds are permitted after the heat treatments preceding the final drawing operation; for 'FD' grades no welds shall be made at finished size unless agreed otherwise between the parties.
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 cap.
The wire shall be protected against corrosion and mechanical damage. Unless otherwise specified the wire shall be delivered in slightly oiled condition.
The surface of the wire shall be smooth and permissible depth of surface defects at the coil ends shall be in accordance with Table.
By in-line control of surface defects the areas of the coil with defects above the level of Table 7 shall be marked. In-line testing is not performed for FD-grades.
The number of defective parts that can be tolerated may be agreed between the parties.
The wire grades according to this standard shall be free from total decarburization. The maximum depths of the partially decarburized zone shall be checked at the end of the coils.
result of the tensile test
result of the torsion test
actual wire diameter
The purchaser shall clearly state in his enquiry or order the product and following information :
a)the desired quantity;
b)the number of this European Standard: EN 10270-2;
d)the nominal wire diameter;
e)the form of delivery and unit mass;
f)the type of inspection document;
g)any particular agreement made.
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