Abstract:
A coke oven door comprises a side bar (3) designed to be sealingly applied against a door frame (2), at least one resiliently flexible bar (5) secured at its centre to the door (1) and curved to apply transverse forces at its ends (5a) to the side bar (3). Eccentric wheels (7) are placed between the curved ends (5a) and the side bar (3) and are constantly held against the latter by the said ends (5a). The wheels (7) are rotatingly mounted about eccentric shafts (8) mounted on the side of the door (1). Elongated holes (12) are provided in the side bar (3) to slidingly receive bolts (13) secured to the door (1). This system ensures that a satisfactory seal is constantly provided between the door (1) and the oven despite deformation of the frame (2) during coking since the sealing edge of the side bar (3) is held constantly against the frame (2).
Abstract:
Method for decarburizing steel in a vacuum treatment chamber consisting of an upper, bell-shaped part (4), an intermediate ring (5) and a lower part (6) containing the bath of metal to be treated (2) and equipped with two plungers (7, 8) which dip into the steel ladle (9) containing the entire batch of metal to be processed (10), characterized in that oxygen is blown horizontally over the bath of metal to be processed (2) at the level of the intermediate ring (5), substantially at its centre. A chamber for vacuum treatment of the steel is also described, in which at least two horizontal blast pipes (11, 12) are incorporated in the intermediate ring (5) of the said chamber, substantially at its centre.
Abstract:
According to a process for the manufacture of a framework (1) for reinforcing concrete structures and, in particular, concrete slab or shell structures in the form of a steel strip (3) with notched or goffered surfaces, a hot laminated sheet is used as a basis material having a width of between 1.5 and 6 mm, whereby said sheet is made of steel with a carbon content of less than 0.9 %, and elastic limit of approximately 500 MPa. Said sheet is subjected to a cold lamination process at a strength-hardening level greater than 40 % in order to obtain a sheet having, on the one hand, a thickness of between 0.8 and 2.5 mm, and on the other hand, an elastic limit greater than 700 MPa, whereby the sheet is split again so as to obtain a steel strip (3) which is then continuously notched or goffered. The application also concerns the framework obtained according to the process.
Abstract:
Said process is characterized in that the methyl formate is converted at a temperature of 170 to 220°C in the presence of (a) a rhodium-based catalyst, (b) an iodated promoter chosen from the following: phosphonium or ammonium alkaline or alkaline-earth iodides and mixtures of homopolar iodine compounds with an added phosphine or tertiary amine, (c) a solvent which is a cyclic N-alkyl amide.
Abstract:
During the application of a roll coating on a metal substrate, using double contactless measuring sensors (1, 3), inductive, and for instance optical or capacitive, the method consists in effecting, before application, at least a double distance measurement over a strip zone not yet coated, then, effecting, after application, at least another double distance measurement over approximately the same zone already coated, and the thickness of the applied coating is deduced from the double measurements before application and after application. The invention is applicable to the measurement of thickness, on ferromagnetic substrates, of non solidified coatings, in particular liquid or pasty and to the adjustment of thickness in installations with corresponding coatings.
Abstract:
The invention discloses the manufacture of a metal tank comprising the following steps: coating a strip of sheet steel with a thermally adhesive polymer based layer, preparing segments provided with assembly zones from the blanks of the said coated sheet, assembling the said segments at the assembly zones, consolidating the assembly by cold mechanical assembling means and heating to activate bonding of the polymer layers in contact at the assembly zones. The invention is useful in particular for manufacturing fuel tanks and heat exchangers.
Abstract:
A continuous casting facility includes an ingot mould with walls (1) formed by cooled metal walls (2) on top of which is provided a feeder bush (3) of a heat insulating material. Pressurised gas injection apertures, such as a slot (10), open into the ingot mould, at least at the interface between said feeder bush and metal wall. The facility comprises means (13 to 17) connected to said apertures for supplying a gas or gas mixture with a thermal expansion capacity controllable on the basis of the cast metal alloy composition and casting conditions. By controlling the thermal expansion capacity of the injected gas, the density of the heat flow extracted from the cast metal in the area where solidification starts can also be adjusted. The invention is particularly useful for the continuous casting of steel.
Abstract:
An ingot mould has a cooled copper or copper alloy body (1) on top of which is mounted a refractory feeder bush (2) and at the interface of which is provided a sweeping slot (8) through which an inert waste gas stream is injected at the inner periphery of said ingot mould. The slot is fed by a distribution chamber (13) provided inside the ingot mould, which chamber is in turn fed with gas by manifolds (12) connecting it to a pressurised gas source (20). The injection slot (8) is divided, along the periphery of the ingot mould, by separation means (21) which also divide the distribution chamber into adjacent compartments (13'-13'') extending along the periphery of the ingot mould so that an inlet manifold (12) opens into each compartment thus formed. A plurality of elementary systems (12'-13'-8') are thus obtained, which are mounted parallel to each other on a single pressure chamber (20) so that, generally, the injection of gas at the periphery of the ingot mould is substantially insensitive to local interferences, such as localised variations of slot thickness.
Abstract:
The ingot mould of the invention includes a cooled copper body (4) on top of which is mounted a refractory feeder bush (9) consisting of two components: a heat insulating upper sleeve (16) and a compact refractory lower ring (17) of high mechanical strength enclosed by a crimping bush (18) which is narrower than ring (17) so that the latter projects on either side of the crimping bush. By subjecting the inner surface of the crimping bush to successive surfacing treatments which are repeated after the two surfaces have been reversed, it is possible to extend substantially the useful life of said crimping bush before replacing it.
Abstract:
A device comprising at least one blade (11) extending transversely relative to the forward direction (F1) of a slab (1), and substantially tangentially movable in said direction relative to the lower slab surface (4), a movable sensor (13) arrangeable in a stand-by position on the path of the slab so that it may be actuated by a front surface (2) of the moving slab, and means (12, 14, 15) for moving the blades out of a position in which they are upstream from the sensor relative to said forward direction (F1), at a speed greater than that of the slab, when said slab moves the sensor. The device is particularly useful for trimming the front ends of slabs between a reheating furnace and a break-down mill in a hot rolling mill.