# US 4,395,026 A · Refractory gas-permeable structural unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,395,026 A - Document ID: US4395026A - Status: Granted - Kind: A - Application number: 06/277,218 - Filed: 1981-06-25 - Granted: 1983-07-26 - Earliest claimed: 1980-06-25 - Assignees: Arbed S.A. - Inventors: Fritz Hodl; Friedrich Kassegger - Web page: https://patentgrep.com/patent/US4395026A ## CPC - C21C 5/34: Blowing through the bath (C21C5/35 takes precedence) - B22D 1/005: {Injection assemblies therefor (features relating to gas injection, provided on closures of the sliding gate type B22D41/42; provided on pouring nozzles B22D41/58; provided on closures of the stopper-rod type B22D41/186)} - C21C 7/072: Treatment with gases (C21C7/06, C21C7/064, C21C7/068 take precedence) - C21C: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS - B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22) ## Abstract A refractory gas-permeable structural unit for blowing a gas into a metal treatment vessel and through its casing has at least two elements composed of refractory material and having abutting longitudinal faces provided with at least one metal layer, a metal housing surrounding the elements to connect them with one another and tightly abutting against other longitudinal faces of the elements, and a gas distribution chamber formed at an end face of the elements and communicating with a gas supply conduit. ## Claims ### Claim 1 A refractory gas-permeable structural unit for blowing a gas into a metal treatment vessel and through its casing, characterized by a passageway formed by faces of at least two elongated refractory elements, said elements being separated from one another by a thin metal layer so that gas passage takes place between said elements along said metallic layer, said elements each having first and second longitudinal faces and hot and cold end faces, said metallic layer being arranged on the first longitudinal face of at least one of said elements; a metal housing surrounding said elements to connect them with one another and sealingly abutting against said second longitudinal faces of said elements; and means for supplying gas and including a gas distribution chamber formed at said first end faces of said elements and a conduit communicating with said distribution chamber. ### Claim 2 (depends on 1) A structural unit as defined in claim 1, wherein said elements are composed of a material having a carbon-containing binder selected from the group consisting of tar, pitch and plastic resin. ### Claim 3 (depends on 1) A structural unit as defined in claim 1, wherein said elements are composed of a material having a chemical binder. ### Claim 4 (depends on 1) A structural unit as defined in claim 1, and further comprising a mortar layer provided between said second longitudinal face of each of said elements and said metal housing. ### Claim 5 (depends on 1) A structural unit as defined in claim 1, wherein said metal layer is compressed with the refractory material of a respective one of said elements. ### Claim 6 (depends on 1) A structural unit as defined in claim 1, wherein said metal layer lies on the refractory material at said one first longitudinal face of each of said elements. ### Claim 7 (depends on 1) A structural unit as defined in claim 1, wherein said metal layer also has longitudinal faces, said longitudinal faces of said elements and of said metal layer being smooth. ### Claim 8 (depends on 1) A structural unit is defined in claim 1, wherein said metal layer also has longitudinal faces, said longitudinal faces of said elements and of said metal layer being formed as shaped faces. ### Claim 9 (depends on 8) A structural unit as defined in claim 8, wherein said longitudinal faces of said elements and of said metal layer are corrugated. ### Claim 10 (depends on 8) A structural unit as defined in claim 8, wherein said longitudinal faces of said elements and of said metal layer are provided with grooves. ### Claim 11 (depends on 1) A structural unit as defined in claim 1, and further comprising an additional metal layer arranged on said first-mentioned metal layer of said one element, the first longitudinal face of the other of said elements being free from said metal layers. ### Claim 12 (depends on 11) A structural unit as defined in claim 11, wherein said additional metal layer is connected with said first metal layer by welding. ### Claim 13 (depends on 1) A structural unit as defined in claim 1; and further comprising a pair of metal inserts abutting against one another compressed and embedded into at least one of said elements so as to form said metal layer. ### Claim 14 (depends on 13) A structural unit as defined in claim 13, wherein said embedded metal inserts are formed as metal sheets. ### Claim 15 (depends on 14) A structural unit as defined in claim 14; and further comprising spacing members provided between said embedded metal inserts. ### Claim 16 (depends on 15) A structural unit as defined in claim 15, wherein said metal inserts have shaped portions which form said spacing members. ### Claim 17 (depends on 16) A structural unit as defined in claim 16, said shaped portions of said metal inserts which form said spacing members are shaped as corrugations. ### Claim 18 (depends on 15) A structural unit as defined in claim 15, wherein said portions of said metal inserts which form said spacing members are shaped as knubs. ### Claim 19 (depends on 15) A structural unit as defined in claim 15, wherein said spacing members between said metal inserts are formed by wires. ### Claim 20 (depends on 15) A structural unit as defined in claim 15, wherein said spacing members between said metal inserts are formed by metal strips. ### Claim 21 (depends on 15) A structural unit as defined in claim 15, wherein said spacing members between said metal inserts are formed as insertable members composed of a material selected from the group consisting of a combustible material and a vaporizable material. ### Claim 22 (depends on 1) A structural unit as defined in claim 1, wherein said metal layer is composed of a steel sheet. ### Claim 23 (depends on 22) A structural unit as defined in claim 22, wheein said steel sheet forming said metal layer is provided with a surface protection. ### Claim 24 (depends on 1) A structural unit as defined in claim 1, wherein said metal layer is provided with a plurality of claws for improving retention of said metal layer in the refractory material of a respective one of said elements. ### Claim 25 (depends on 13) A structural unit as defined in claim 13, wherein said metal inserts are provided with a plurality of claws for improving retention of said metal inserts in the refractory material of a respective one of said elements. ### Claim 26 (depends on 1) A structural unit as defined in claim 1, wherein the structural unit has a plurality of passageways arranged for gas passage and each provided with a metal layer.