Compagnie Generale Des Etablissements Michelin

Benoît Renaux

Eric Colin

Pierre Morisot

Elisabeth Faucheux

Alexandre Gianetti

Marianna Chevalley

Romain Barbat

Stephane Laurent

Stéphane Laurent

A multi-strand cord () comprises an internal layer (CI) made up of K=1 internal strand (TI) having two layers (C, C), with the internal layer (C) being made up of Q internal metallic threads (F) and the external layer (C) being made up of N external metallic threads (F), and an external layer (CE) made up of L>1 external strands (TE) having two layers (C', C′) wound around the internal layer (CI), with the internal layer (C′) being made up of Q′ internal metallic threads (F′) and the external layer (C′) being made up of N′ external metallic threads (F′). The cord () has an energy-to-break per unit area ES≥145 N·mmwith where is the sum of the forces at break, is the sum of the total elongation, Cfrag is the coefficient of weakening, and D is the diameter.

Two-layer multi-strand cable having an improved surface energy-to-break

The method for the heat treatment of a steel reinforcing element (F) for a tire comprises a transformation of the steel microstructure and in which the temperature of the reinforcing element (F) is reduced during the transformation of the steel microstructure by simultaneously extracting heat from the reinforcing element (F) and supplying heat to the reinforcing element (F).

Method for the heat treatment of a steel reinforcement element for tires

A method for the heat treatment of a steel reinforcing element (F) for a tire, comprises a step of reducing the temperature of the reinforcing element by continuous cooling: from an initial temperature of the austenite range, to a final temperature of the ferrite-pearlite range, passing through at least one transformation range of the steel, the transformation range(s) being distinct from the bainite range. The temperature reduction step comprises a transformation (C, C) from the austenitic microstructure to the ferritic-pearlitic microstructure. The temperature of the reinforcing element is strictly decreasing during the reduction step. The mean rate of temperature reduction during the transformation (C, C) of the steel microstructure is greater than or equal to 30&#xb0; C.&#xb7;sand less than or equal to 110&#xb0; C.&#xb7;s.

Method for heat treatment with continuous cooling of a steel reinforcement element for tires

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Clermont-Ferrand, France

Benoît Renaux