|Grade:||High Carbon Steel||Feature:||Patented|
|Surface Condition:||Bright /phosphate Coated /reddish /copper Plated/galvanised /zinc/aluminium Coated/yellow Coated/white (liquor Finished)||Classification:||Patented Spring Steel Wire|
|Standard:||JIS G3521 SWRH72A|
ISO9001 Patented Steel Wire,
70mm Patented Steel Wire,
wire drawn to size by cold deformation of a starting material that has been subjected to a thermal treatment of patenting
The grade of spring wire used depends on the stress level and the nature of the duty. Where springs are subjected to static stresses or infrequent dynamic loading, a wire grade for static duty (S) shall be used. In the other cases with frequent or predominantly dynamic loading and where small coiling ratios or severe bending radius is required, a wire grade for dynamic duty (D) shall be used. Depending on the stress level, spring wire is manufactured in three tensile strength grades: low, medium and high.
|Grade||C||Si||Mn||P max.||S max.||Cu max.|
|SL, SM, SH||0,35-1,00||
wire drawn to size by cold deformation of a starting material that has been subjected to a thermal treatment of patenting, giving structure suitable for subsequent rolling or drawing.
HEAT TREATMENT consisting of AUSTENITIZING followed by COOLING under conditions suitable for producing the appropriate structures for subsequent wire-drawing or rolling. The medium in which the PATENTING takes place should be specified, for example air, lead bath etc.
All cold drawn spring wire is commonly shaped by drawing. A distinction as to the method of drawing can be
dry drawn (d): drawn through pulverized lubricants such as soap, stearates or similar substances;
paste drawn (ps): drawn through very viscous greases of mineral oil base, tallow, synthetic waxes or
grey bright (gr): drawn through rape oil, thin-bodied mineral oils or similar substances;
wet drawn (w): drawn through aqueous emulsions of greases or oil emulsions;
liquor finished (l): drawn through aqueous solutions with or without addition of metal salts.
Form of delivery
The wire shall be delivered in unit packages of a coil (singles, carriers or formers), spools, spoolless cores or as straight lengths. Unless otherwise agreed at the time of ordering, the form of delivery will be coils; straight lengths shall be supplied in bundles.
Coating and surface finish
The spring wire may be supplied phosphate coated (ph) either dry drawn or wet drawn, copper coated (cu), zinc (Z) or zinc/aluminium (ZA) coated.
Other coatings, considered as special, can be agreed between the purchaser and the supplier. If no specific surface finish is specified, the type of finish shall be at the manufacturers discretion. In addition the wire can be ordered with an oiled surface for all surface finishes.
The surface for spring wire generally has a coating for facilitating wire drawing and spring forming.
Exceptionally the material will be uncoated. Common surface coatings are:
bright (b): without any special coating: standard borax coating or lime-coating may be applied;
phosphate coated (ph): the wire has been treated in a solution to form a metal-phosphate layer on the
reddish (rd): the surface is covered with a thin copper, generally a conversion coating;
copper plated (cu): the surface is covered with a (uniform) thick copper coating;
galvanised (Z): the surface is covered with a zinc coating;
zinc/aluminium coated (ZA): the surface is covered with a Zn 95/Al 5 coating;
yellow coated (y): this applies only to liquor finished products whereby a mixture of tin salts and copper
salts are added at the liquor finishing;
white (liquor finished) (wh): this applies to liquor finished products whereby tin salts are added for liquor
The surface of the wire shall be smooth and as free as possible from grooves, tears, rust and other surface defects, which have a noticeable adverse effect on the application of the wire.
In the case of zinc or zinc/aluminium coated spring wire the amount of zinc or zinc/aluminium on the wire surface shall satisfy the minimum values specified
Out of roundness
The difference between the maximum and minimum diameter of the wire at the same cross section shall not be more than 50 % of the total permissible deviation specified
Marking and packaging
Each unit shall be properly marked and identified so as to permit traceability and reference to the inspection documents.
The labels shall withstand normal handling and contact with oil; they shall show the information according to EN 10270-1. Other information shall be the subject of an arrangement between the parties.
Wire shipments shall be suitably protected against mechanical damage and/or contamination during transport.
Information to be supplied by the purchaser
The purchaser shall clearly state in his enquiry or order the product and following information:
a) the desired quantity;
b) the term spring steel wire or straightened and cut lengths;
c) the number of this European standard: EN 10270-1;
d) the steel grade
e) the nominal wire diameter selected from Table 3 and for cut length the length and the length tolerance
f) the coating indicated by its abbreviation and surface finish
g) the form of delivery and unit mass
h) the type of inspection document;
i) any particular agreement
Zinc and zinc/aluminium coating
Adherence of coating
Contact Person: Ms. Florence Tang