| Patents for B21B 25 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group; Accessories or auxiliary means therefor (1,103) |
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| 04/21/2005 | WO2005035154A1 Method of manufacturing seamless tube by three-roll mandrel mill |
| 03/24/2005 | DE10338938A1 Feed mechanism for seamless pipe mill has two identical and separated drive motors arranged in series |
| 03/17/2005 | WO2005023966A1 Lubricant composition for seamless steel pipe working |
| 03/09/2005 | CN1191889C Plug and mandrel bar for rolling of seamless steel pipe and method of mfg . seamless steel pipe |
| 02/23/2005 | CN1583304A Feeding device and method for rolled pieces |
| 02/09/2005 | CN2677050Y Core rod of seamless steel-pipe tube mill |
| 02/09/2005 | CN1575877A Rolling mill for the fabrication of seamless tubes |
| 01/26/2005 | EP1500441A1 Rolling mill for the fabrication of seamless tubes |
| 01/19/2005 | EP1498193A1 Method and device for fabricating seamless tubes |
| 01/05/2005 | CN1559714A Production technology for punching continuous casting blank by head |
| 12/28/2004 | US6834523 Method for producing seamless tube with grooved inner surface |
| 12/16/2004 | WO2004108311A1 Cr-PLATED MADNREL BAR FOR MANUFACTURING HOT SEAMLESS TUBE AND METHOD OF MANUFACTURING THE SAME |
| 12/01/2004 | CN2659571Y Anti-dropping connector for cold tube mill core rod and core bar |
| 11/25/2004 | WO2004101837A1 Tool steel for hot working, tool for hot working and plug for producing seamless pipe |
| 11/17/2004 | CN2656037Y Centering section structure in mill spline driving |
| 10/28/2004 | DE10311144B3 Verfahren zum Herstellen eines Rohres mit einer Innenprofilierung und Vorrichtung zur Durchführung des Verfahrens A method for manufacturing a pipe with an inner profiling and apparatus for carrying out the method |
| 10/14/2004 | US20040200249 Method of and apparatus for producing tubes of metal |
| 10/13/2004 | EP1466674A2 Method and device for the manufacturing of a tube from a metallic material |
| 10/13/2004 | CN1535774A Method and device for making metal pipe |
| 10/12/2004 | CA2463351A1 Method of and apparatus for producing tubes of metal |
| 10/06/2004 | EP1463591A1 Method and rolling stand for producing rods, bar stock or seamless tubes |
| 09/23/2004 | DE10333507B3 Process to manufacture a seamless steel pipe by punching hot metal block with a mandrel followed by passage through inclined nip mill |
| 09/22/2004 | CN1167522C Unit for rolling pipes on mandrel |
| 09/15/2004 | EP1457273A2 Method and device for producing a tube with an inner profile |
| 09/09/2004 | DE10261632B4 Verfahren und Walzanlage zum Herstellen von Draht, Stäben oder nahtlosen Rohren A method and rolling mill for producing wire rods or seamless tubes |
| 09/02/2004 | DE10316910B3 Production of metallic pipes comprises rolling the start of the pipe loop and/or the end of the pipe loop together using an inner tool |
| 09/01/2004 | CN1164378C Method for lowering the friction coefficient between core rod and hollow billet |
| 08/12/2004 | DE10334011B3 Rolling mill forming seamless steel tube, includes roller end sections to grip and carry the tube or its blank, and inner tool with blank-penetrating section at its end |
| 08/12/2004 | DE10309687B3 Internal machining tool for boring out heated metal block for hollow block manufacture with axial gap between threaded sections of mandrel rod and end piece for wear compensation |
| 06/24/2004 | WO2004052569A1 Seamless metal tube producing method |
| 06/09/2004 | EP1010477B1 Plug and mandrel bar for rolling of seamless steel pipe and method of manufacturing seamless steel pipe |
| 06/02/2004 | CN1152386C Guide tube for nuclear reactor fuel assembly and manufacturing method thereof |
| 04/14/2004 | CN2611063Y Centre made up of high alloy for punching |
| 04/13/2004 | US6718811 Process for producing a guide tube of a nuclear reactor fuel assembly, mandrel for forming the guide tube, and the guide tube obtained |
| 04/07/2004 | CN2609682Y Two-way head centring machine for pipe blank |
| 03/31/2004 | CN2608164Y Continuous tube mill core rod |
| 11/25/2003 | US6651473 Cold-rolling seamless copper tubing |
| 10/29/2003 | CN2582769Y Perforating and expanding top |
| 10/15/2003 | CN1448230A Apparatus for producing internally grooved tube |
| 10/15/2003 | CN1448228A Apparatus for producing internally grooved tube |
| 10/02/2003 | US20030182980 Apparatus for producing internally grooved tube |
| 10/02/2003 | US20030182979 Method for producing seamless tube with groved inner surface |
| 07/30/2003 | CN1116133C Method for controlling length and position of mandrel in use |
| 07/17/2003 | WO2003057383A1 Method and rolling stand for producing rods, bar stock or seamless tubes |
| 07/02/2003 | CN2558476Y Crossbeam adjusting device for metal pipe row roller former |
| 05/21/2003 | CN2551367Y Mandrel for roll piercing large expanding |
| 05/07/2003 | CN2548731Y Roller distance adjusting device for rolling guides and guards |
| 05/07/2003 | CN2548730Y Roller distance adjusting device for rolling guides and guards |
| 05/07/2003 | CN1415439A Method for lowering the friction coefficient between core rod and hollow billet |
| 01/15/2003 | CN2530742Y Tube mill mandrel |
| 10/29/2002 | CA2082031C A rolling stand, having three or more driven and adjustable rollers |
| 09/25/2002 | CN1370640A Seamless copper tube cold rolling process |
| 08/29/2002 | US20020116971 Cold-rolling seamless copper tubing |
| 08/29/2002 | DE10107567A1 Verfahren zum Kaltwalzen von nahtlosen Kupferrohren A method for cold-rolling of seamless copper tubing |
| 08/21/2002 | EP1232808A2 Method for cold rolling seamless copper pipes |
| 07/03/2002 | CN1086965C Tech for mfg. mandrel use to roll seamless steel tube |
| 06/25/2002 | US6411668 Guide tube of a nuclear reactor fuel assembly |
| 04/17/2002 | CN2486231Y Break detector of cold rolled tube machine core stick |
| 01/10/2002 | US20020003849 Process for producing a guide tube of a nuclear reactor fuel assembly, mandrel for forming the guide tube, and the guide tube obtained |
| 11/22/2001 | DE10024246A1 Lochdorn zum Schrägwalzen von metallischen Hohlkörpern auf Schrägwalzwerken Piercer to skew rolls of metallic hollow bodies on inclined rolling mills |
| 11/21/2001 | EP1155754A2 Mandrel for skew rolling of metallic hollow bodies in skew rolling mills |
| 09/05/2001 | CN1070528C Lubricant compsns. for heat working |
| 08/22/2001 | CN1308996A Method for controlling length and position of mandrel in use |
| 07/17/2001 | US6260396 2-Roll piercing mill and method of producing hollow blocks from high alloy steels |
| 04/04/2001 | CN2425722Y Perforator and ejector rod connection mechanism |
| 03/27/2001 | US6205833 Cold pilger rolling tool for producing internally ribbed tubes |
| 03/20/2001 | US6202463 Plug and mandrel bar for seamless steel pipe rolling operation for manufacturing seamless steel pipe |
| 03/07/2001 | CN1062786C Method and device for placing plugs on plug mill |
| 12/06/2000 | CN2408983Y 一种芯棒 One kind of mandrel |
| 09/13/2000 | EP1034853A2 Cold pilger rolling tool for the manufacture of internally ribbed pipes |
| 08/02/2000 | EP1023952A1 Dual roll cross-rolling mill and method for rolling hollow billets of high-alloy steels |
| 07/27/2000 | DE19903974A1 2-Walzen-Schrägwalzwerk und Verfahren zur Herstellung von Hohlblöcken aus hochlegierten Stählen 2-roll cross-rolling mill and process for the production of hollow blocks of high-alloy steels |
| 07/26/2000 | CN2389023Y Apparatus for making unprocessed tube turning over in time |
| 06/21/2000 | EP1010477A1 Plug and mandrel bar for rolling of seamless steel pipe and method of manufacturing seamless steel pipe |
| 06/13/2000 | US6073331 Method for manufacturing seamless pipe |
| 06/07/2000 | CN1053127C Method and appts. for elongating metal tubes by means of mandrel mill |
| 05/18/2000 | DE19852537A1 Extrusion process for producing seamless hollow body with one closed end, involving forming closed end of hollow block when holing it, displacing material from edge towards center |
| 05/04/2000 | DE19911677C1 Cold forming tool is used to produce internally ribbed pipe by the cold pilger step by step process |
| 05/03/2000 | CN1251786A Technology for manufacturing mandrel used to roll seamless steel tube |
| 04/19/2000 | CN1051482C Design method forpiercing head for rolling thin-wall hollow billet in two high mill |
| 03/28/2000 | US6041635 Unit for rolling pipes on a mandrel |
| 02/09/2000 | EP0868231B1 A unit for rolling pipes on a mandrel |
| 12/28/1999 | US6006575 Reversible mandrel bar assembly |
| 12/08/1999 | CN1047111C Pipe mill consisted of three roller mill stand |
| 11/16/1999 | US5983689 Lubricant for use in hot work |
| 10/20/1999 | CN1045730C Device and method for monitoring mandrel of high speed cold mill for seamless tube |
| 09/29/1999 | CN1230138A Plug and mandrel bar for rolling of seamless steel pipe and method of mfg. seamless steel pipe |
| 08/31/1999 | US5946365 Process for producing a guide tube of a nuclear reactor fuel assembly |
| 07/08/1999 | WO1999033588A1 Method and device for descaling pipes |
| 04/28/1999 | CN1214971A Mandrel for metal tube rolling mill and its making method |
| 03/31/1999 | CN1042702C Rolling stand |
| 03/04/1999 | DE19807602C1 Increasing life of piercing mandrels of skew rolling mills |
| 03/03/1999 | EP0777538B1 Method and device for placing plugs on a plug mill |
| 02/03/1999 | CN1207061A Unit for rolling pipes on a mandrel |
| 01/12/1999 | US5859124 Mixture of alkali silicate, silane coupling agent, selected alkali compound, water |
| 01/06/1999 | CN1041497C Top head for metal tube rolling mill and its making method |
| 12/09/1998 | CN1041063C Apparatus for detecting Pilger cold rolled tube core rod |
| 11/11/1998 | CN1198575A Process for producing guide tube of nuclear reactor fuel assembly, mandrel for forming the guide tube, and guide tube obtained |
| 11/03/1998 | US5829296 Method and device for placing plugs on a plug mill |
| 10/28/1998 | EP0874064A1 Method for surface treatment of steel tools |