Sodetal
Straße des 13. Januar 286
D-66333 Völklingen
Telefon: +49 (0) 68 98-879-0
Telefax: +49 (0) 68 98-879-247
E-Mail: dwl@saarstahl.com

Steel cord

Steelcord-constructions for reinforcement of car, agricultural and truck tires in NT, HT, ST, UT

Definitions

Metal fiber

Continuous steel filament through drawing

Filament

Fiber of a very long length considered as continuous. Metal filament : used as a constitutive element in a strand or a cable

Strand

Combination of several filaments to create either an end-product or an intermediary product

Cable

Designates an end-product made of either several strands or of at least one strand and several filaments

Steel cord

General term designating strands or cables

Wrapped cable

Cable around which is wound helically a filament called the wrapping wire or the wrap

Direction of lay "Z"

Designates the helical disposition of a cable. The strand has "Z" or right-hand lay when the orientation of the spires is the same direction than the average part of the letter Z, when held vertically.

Direction of lay "S"

Designates the helical disposition of a cable. The strand has "S" or left-hand lay when the orientation of the spires is the same direction than the average part of the letter S, when held vertically

Standard direction of lay

Strand as finished product: S

Ordinary cable:                  S for strand , Z for cable

Lang's lay cord:                 S for strand , Z for cable

Wrap:                                 direction of lay opposite to that of preceding layer

Length of lay

The axial distance expressed in mm, necessary to complete 360 degree revolution by any of the constitutive element of cable

Mass of brass coating

The quantity of weight in grams of brass per kilogram of brass plated steel ( g/kg or %o) .

Brass coating compostion

The quantity of each of the components as a percentage of the total mass of the coating

Thickness of brass coating

The average value of the radial thickness of the coating layer in microns

Adhesion strength

The linear pulling-out force of a cord embedded in a compound block , measured in N

Flare

Untwist length of the constitutive filaments of a cord after cutting, expressed in mm

Breaking force

The maximum force supported by a specimen during the breaking test expressed in N

Tensile strength

The breaking strength of a filament per unit of the area of the cross section of the sample expressed in MPa

Breaking elongation

The increase of length of the specimen submitted to the breaking force test expressed in % of the initial length

Residual torsion (twist)

The number of revolutions made by the free end of the sample of defined length (generally 6 m), the other end being firmly secured. It's expressed in turns for a definite length , preceeded by the sign + or - , depending respectively from a overtwist or untwist of the cord 

Straightness 

Property of a cord left free on a flat and smooth surface to lay between two parallel lines at a definte distance apart

Fatigue test

3 rolls fatigue test with different preload


Tire structur


Steel cord glossary