Union Siderurgique Du Nord Et De L'est De La France

Union Siderurgique Dunord Et De L'est De La France (Usinor)

Usinor Aciers

Union Siserurgique Du Nord Et De L'est De La France, Par Abreviation

Charles Georges Brun

Jean F Bailleul

Philippe Marcel Tirmarche

Francoise Coolen

Freddy Lecendre

Oliver Chrithian

The apparatus includes excitation windings (5, 6, 7) for imparting to an elongate specimen (1) of ferromagnetic material longitudinal oscillations. A device (30) is provided for cutting off a power amplifier (21) of one (5) of the excitation windings, along with a device (28, 29, 30, 32, 33) for detecting and counting the damped oscillations, after the cutting off of the excitation, whose amplitude is greater than or equal to the initial amplitude of the oscillations multiplied by a coefficient so as to permit the determination of the coefficient of internal friction. The excitation winding are constituted by three coaxial cylindrical windings (5, 6, 7) disposed around the specimen (1).

Method and apparatus for determining the coefficient of internal

The present invention relates to a continuous coating process by a layer of Zn, Al or of a Zn-Al alloy for a cold laminated steel band comprising a heating thermic cycle, followed by a rapid cooling, a tempered coating in the metal bath of coating in fusion, at a temperature from 460.degree. to 500.degree. C., and a subsequent cooling, characterized in that after the tempered coating, the coated steel band is subjected to an over-ageing treatment by maintaining the band at a temperature comprised between 430.degree. and 270.degree. C. during at least two minutes. This process is carried out in an installation comprising an over-ageing chamber.

Process and installation for continuous manufacturing of an old

The process is in particular intended for the manufacture of tinplate and comprises cutting a strip in the direction transverse to the direction of rolling of a reel of steel sheet, subjecting said strip to a drawing action by compression while bending the strip, and examining possible cracking on the surface of the drawn strip. This process is carried out in an apparatus which comprises a frame 1 supporting means 2 for pulling a steel strip and a head 4 for effecting a drawing action by compression while bending the strip. The head is connected to the frame and the steel strip 3 is passed through the head under the action of the pulling means 2.

Process and apparatus for determining the quality of a thin coated or

The present invention relates to a continuous coating process by a layer of Zn, Al or of a Zn-Al alloy for a cold laminated steel band comprising a heating thermic cycle, followed by a rapid cooling, a tempered coating in the metal bath of coating in fusion, at a temperature from 460.degree. to 500.degree. C., and a subsequent cooling, characterized in that after the tempered coating, the coated steel band is subjected to an over-aging treatment by maintaining the band at a temperature comprised between 430.degree. and 270.degree. C. during at least two minutes. This process is carried out in an installation comprising an over-aging chamber.

The device is so improved as to decrease the tensile forces to be exerted on the band. For this purpose, the axes of the lower rollers and upper rollers, when viewed in projection on a horizontal plane, make with the perpendicular to the line of travel of the band equal and opposite angles. Application in particular in vertical band accumulating means in continuous heat treatment furnaces.

Device for guiding band material and applications thereof

For treating a steel sheet for subsequent enamelling of the sheet with one coat of enamel: After rolling the sheet, there is deposited thereon a coat of nickel and/or cobalt, a salt of said metals or mixtures of said salts. After drying, the sheet is annealed in a decarburizing atmosphere so as to substantially totally decarburize it and, during the cooling of the annealing cycle, the coated sheet is subjected to the action of an oxidizing atmosphere containing 2 to 7% of water vapor and having an H.sub.2 /H.sub. 2 O ratio which is less than 6.

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Montataire, France

Charles Georges Brun