Abstract: Method of treating the area surrounding an acid gas storage well (1) using a reactive solution, wherein the following stages are carried out: a) injecting from the well a wash fluid for washing the rock of said surrounding area so that it no longer contains products reactive with said solution, b) injecting into the rock thus washed a predetermined volume of reactive solution suited to react with acid gases.

Abstract: The use is described, in the fabrication of apparatus and equipment used in refining and in petrochemicals (for example furnace, reactor or line elements), of a steel composition comprising: at most 0.25% C; more than 1% up to 10% Mn; 1.5% to 5% Si; at most 0.03% P; at most 0.03% S; 4% to 10% Cr; 0.5% to 2% Mo; at most 0.40% V; and at most 0.10% N; the complement to 100% being essentially iron. Steels comprising: at most 0.15% C; more than 2% up to 10% Mn; 1.5% to 5% Si; at most 0.03% P; at most 0.03% S; 4% to 10% Cr; more than 0.5% up to 2% Mo; at most 0.40% V; and at most 0.10% N; the complement to 100% being essentially iron; are themselves novel.

Abstract: The invention relates to a device for detecting the corrosion induced by a medium on a structure. The device comprises a chamber (5) closed by a closing disc (4) made of such a material that the disc becomes permeable to the medium once corroded by the medium, and means for measuring the refractive index of the medium present in the chamber. According to a preferred embodiment, an optical fiber is used to measure the refractive index variation.

Abstract: The invention relates to a device for detecting the corrosion induced by a medium on a structure. The device comprises a chamber (5) closed by a closing disc (4) made of such a material that the disc becomes permeable to the medium once corroded by the medium, and means for measuring the refractive index of the medium present in the chamber. According to a preferred embodiment, an optical fiber is used to measure the refractive index variation.

Abstract: An austenitic stainless steel with a composition comprising: at most 0.15% of C; 2% to 10% of Mn; at most 2% of Ni; at most 4% of Cu; 0.1% to 0.4% of N; 10% to 20% of Cr; at most 1% of Si; at most 3% of Mo; and at most 0.7% of Ti; is used to manufacture equipment, for example furnaces, reactors or ducts, or elements of this equipment, or to coat the internal walls of this equipment, said equipment being used to implement petrochemical processes conducted at temperatures of 350° C. to 1100° C. and in which coke can be formed.

Abstract: The use is described, in the fabrication of apparatus and equipment used in refining and in petrochemicals (for example furnace, reactor or line elements), of a steel composition comprising:

Abstract: In order to increase the cracking corrosion resistance of a wire under stress compressive stresses are introduced through surface treatment by brushing, on the apparent surface of the wire. A system and method are notably applied for the manufacture of wire-reinforced flexible pipes. The reinforcing wires are subjected to a surface treatment by brushing after setting the wires on the flexible pipe.

Abstract: Materials that consist at least in part of aluminum quasi-crystals whose composition is represented by the general formula:

Abstract: An austenitic stainless steel with a composition comprising:

Abstract: In order to produce elements for furnaces, reactors or conduits on the walls of which coke can appear, steels are used with a composition which is adapted to resist coking comprising, by weight, at most 0.25% of C, 1.5% to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.030% of S and at most 0.03% of P, the complement to 100% being essentially iron. Novel steel compositions for use in these applications are those which comprise, by weight, at most 0.25% of C, more than 2.5% and up to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.03% of S and at most 0.03% of P, the complement to 100% being essentially iron.

Abstract: The present invention relates to a flexible tubular pipe for carrying fluids under pressure containing H2S and to a method for designing such a flexible pipe. The pipe includes a body (7), an internal sealing sheath (8), at least one steel armouring layer (9,10) withstanding the stresses induced by the inside/outside pressure difference, and at least one traction-resisting steel armouring layer (11, 12) spirally wound at an angle less than 45° in relation to the axis of the pipe. In this pipe, at least the armouring layer withstanding the stresses induced by the inside/outside pressure difference is made of a determined steel meeting H2S resistance criteria, and at least the traction-resisting armouring layer is made from steel wires that do not meet H2S resistance criteria.

Abstract: In order to produce elements for furnaces, reactors or conduits on the walls of which coke can appear, steels are used with a composition which is adapted to resist coking comprising, by weight, at most 0.25% of C, 1.5% to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.030% of S and at to most 0.03% of P, the complement to 100% being essentially iron. Novel steel compositions for use in these applications are those which comprise, by weight, at most 0.25% of C, more than 2.5% and up to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.03% of S and at most 0.03% of P, the complement to 100% being essentially iron.

Abstract: The present invention relates to a method for predicting and controlling the hydrogen corrosion and embrittlement behavior of steels in the presence of H2S. In the method, at least the following stages are carried out: determining a characteristic value l0 which is a function of the proportion of dislocations present in the lattice of a first steel sample treated under hardening conditions such that, after the hardening treatment, by quenching and tempering or by work hardening, the hardness of said steel reaches a maximum value at a threshold stress &sgr;threshold such that &sgr;threshold equals k·Rp0.2 k being less than or equal to Rp0.