# US 2017/0283897 A1 · Method and system for the production of a seamless hot-rolled tube as well as a rolled centrifugally cast tube and use of a hollow block produced by means of centrifugal casting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0283897 A1 - Document ID: US20170283897A1 - Status: Published application - Kind: A1 - Application number: 15/474,064 - Filed: 2017-03-30 - Published: 2017-10-05 - Earliest claimed: 2016-04-01 - Assignees: SMS group GmbH - Applicants: SMS group GmbH - Inventors: Helge DAEHNDEL; Norbert THEELEN - Web page: https://patentgrep.com/patent/US20170283897A1 ## CPC - C21D 9/08: for tubular bodies or pipes - B21B 23/00: Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes {planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling}(B21B25/00 takes precedence) - B22D 13/02: of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis - C21D 8/10: during manufacturing of tubular bodies - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04) - 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 Sensitive hollow blocks or tubes are elongated in a hot-forming elongator while maintaining, if possible, the internal structure that is present or that forms immediately after casting, and thereby, in the case of suitable method management, even thin-walled tubes or tubes rolled from centrifugally cast hollow blocks can be made available to a sufficiently operationally reliable extent. As a result, for the first time, it is possible for rolled centrifugally cast composite material tubes to be made available and for composite material hollow. blocks produced using centrifugal casting to be utilized for the production of a seamless tube. ## Claims ### Claim 1 A production method for producing a seamless hot-rolled tube comprising: elongating a cast hollow block in a hot-forming elongator with an elongation of 10 or less; including one of the following: (i) circumventing a cross-roll piercing step or interposing a cross-roll piercing step at an elongation below 1.5; (ii) utilizing at least part of the casting heat; or (iii) utilizing at least part of the casting heat and circumventing a cross-roll piercing step or interposing a cross-roll piercing step at an elongation below 1.5. ### Claim 2 (depends on 1) The production method according to claim 1, wherein the hollow block is heated before elongation in the elongator, tempered in a furnace as a buffer, or heated before elongation in the elongator and tempered in a furnace as a buffer. ### Claim 3 (depends on 1) The production method according to claim 1, wherein after elongation, the hollow block is calibrated in a calibration unit. ### Claim 4 (depends on 1) The production method according to claim 1, wherein said cast hollow block is elongated in the hot-forming elongator with an elongation of 8 or less. ### Claim 5 (depends on 4) The production method according to claim 4, wherein said cast hollow block is elongated in the hot-forming elongator with an elongation of 7 or less. ### Claim 6 (depends on 1) The production method according to claim 1, wherein the elongator is a longitudinal rolling mill. ### Claim 7 (depends on 6) The production method according to claim 6, wherein said longitudinal rolling mill is a push bench. ### Claim 8 A production system for producing a seamless hot-rolled tube comprising: (a) a hollow-block casting unit; (b) an elongator disposed behind the hollow-block casting unit; and (c) a conveying segment between the hollow-block casting unit and the elongator; wherein said conveying segment is sufficiently short so that part of the casting heat can be utilized for elongation in the elongator; and wherein said conveying segment is interrupted by a furnace, or runs without interruption and has a lock system to and from a furnace, or is interrupted at most by a severing unit. ### Claim 9 (depends on 8) The production system according to claim 8, wherein the furnace serves as at least one of a buffer, a reheater, and a temperature equalizer. ### Claim 10 (depends on 8) The production system according to claim 8, wherein the hollow-block casting unit is a centrifugal casting unit. ### Claim 11 (depends on 8) The production system according to claim 8, wherein the elongator is followed by a calibration unit. ### Claim 12 (depends on 11) The production system according to claim 11, wherein the calibration unit comprises at least one of a sizing mill and an elongation reduction unit. ### Claim 13 (depends on 8) The production system according to claim 8, wherein the elongator is a longitudinal rolling mill. ### Claim 14 (depends on 13) The production system according to claim 13, wherein the longitudinal rolling mill is a push bench. ### Claim 15 (depends on 13) The production system according to claim 13, wherein the longitudinal rolling mill has an elongation of 2 or more and of 8 or less. ### Claim 16 A rolled centrifugally cast tube comprising a hot-rolled centrifugally cast composite material tube. ### Claim 17 A seamless hot-rolled centrifugally cast composite material tube produced using a composite material hollow block produced by centrifugal casting.