| 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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| 09/09/2009 | EP2098310A1 Manufacturing method for seamless pipe |
| 09/09/2009 | CN101524713A Improved locking top structure |
| 09/09/2009 | CN100537068C Disconnection device for punch refrigerant top |
| 09/02/2009 | EP1446243B1 Extrusion die for manufacturing tube with small hollow portions and mandrel used for said extrusion die |
| 08/12/2009 | EP1679136B1 Method of manufacturing seamless tube by three-roll mandrel mill |
| 08/12/2009 | CN201287136Y High-strength aluminum alloy pipe bus milling forcer |
| 08/12/2009 | CN101505886A Mandrel bar cleaning facility |
| 08/12/2009 | CN101502846A Moveable short core rod device for Men tube mill |
| 08/05/2009 | CN201283359Y Concave push head structure of tube push bench |
| 08/05/2009 | CN201283358Y Two-stage type overlaying welding compound core rod |
| 08/05/2009 | CN101500719A Method for using Cr plating mandrel bar for hot rolling |
| 08/05/2009 | CN100522404C Process for producing seamless steel pipe |
| 07/22/2009 | CN201275546Y Restrained mandrel bar water-cooling jacket of seamless pipe disc type elongating mill |
| 07/22/2009 | CN201275545Y Holding unit of rolled steel tube |
| 07/22/2009 | CN101486044A Method for producing restraint core rod of diameter above 330mm for tandem rolling tube |
| 07/15/2009 | CN101480662A Grooving pushing-in rotary type roll shaft and roll stand |
| 06/10/2009 | CN201253628Y Back chuck mechanism for cold reduction mill |
| 06/10/2009 | CN101454089A Process for producing seamless stainless-steel pipe |
| 06/10/2009 | CN101450350A Method and rolling mill to produce wireless steel pipes |
| 06/03/2009 | CN100494448C Tool steel for hot working, tool for hot working and plug for producing seamless pipe |
| 05/27/2009 | CN101439362A Mandrel or mandrel bar for manufacture of pipes |
| 05/27/2009 | CN100491002C Ceramic-metallic composite cladding layer top head for tube inserting machine and method for producing the same |
| 05/20/2009 | EP2060334A1 METHOD OF USING Cr-PLATED MANDREL BAR FOR HOT ROLLING |
| 05/20/2009 | CN100488652C Feeding device and method for rolled pieces |
| 05/13/2009 | CN101428296A Pre-rotation apparatus for large-scale punching machine post rod |
| 05/07/2009 | WO2009057471A1 Piercing plug, method for regenerating piercing plug, and regeneration facility line for piercing plug |
| 05/06/2009 | EP2055399A1 Mandrel bar cleaning facility |
| 05/06/2009 | CN101426594A Process for producing stainless-steel pipe |
| 05/06/2009 | CN100485020C Lubricant composition for thermoplastic processing |
| 04/29/2009 | CN101417289A Core holding device of rolled steel tube |
| 04/29/2009 | CN101417288A Pull core rod device for sizing and reducing set |
| 04/23/2009 | DE102007037736A1 Mandrel or mandrel bar for manufacture of copper pipes is fabricated of 75 per cent or more molybdenum |
| 04/22/2009 | EP2002903A9 Method for production of seamless pipe, and oxidizing gas supply apparatus |
| 04/22/2009 | CN201225503Y Lubricant oil filter |
| 04/15/2009 | CN101410197A Mandrel holder head with release device |
| 04/08/2009 | CN101405377A Lubricant for hot plastic working and powder lubricant composition for hot working |
| 04/02/2009 | WO2009040894A1 Piercer plug and boring/rolling method |
| 04/02/2009 | DE102008031569A1 Mandrel for rolling of hollow ingot, has mandrel bar with thorn arranged at axial end of mandrel bar, where thorn is arranged in relocated manner relative to mandrel bar in more radial direction |
| 04/01/2009 | EP2042247A1 Piercer |
| 04/01/2009 | CN101400455A Mandrel bar for rolling of high alloy, method for surface treatment of the mandrel bar, method for manufacture of the mandrel bar, and method for operation of seamless steel pipe production apparatus |
| 04/01/2009 | CN101396693A Piercer |
| 03/25/2009 | CN101391265A Base steel composite material for seamless steel pipe top and preparation method thereof |
| 03/24/2009 | US7506526 Seamless tube piercing/rolling plug, and seamless tube producing method using same |
| 03/18/2009 | CN201209758Y Lubricating oil filtration apparatus |
| 03/04/2009 | CN100464883C A Cr-plated mandrel bar for manufacturing hot seamless tubes and a manufacturing method thereof |
| 02/25/2009 | CN201197988Y Plug locking structure |
| 02/25/2009 | CN100463768C Welding technology for broken and waste core rod |
| 02/25/2009 | CN100463734C Core rod slaving mechanism of three-roll thermal precise mill |
| 02/18/2009 | EP2025421A1 Process for producing seamless stainless-steel pipe |
| 02/18/2009 | CN101367090A Rear chuck mechanism for cold pilger mill |
| 02/11/2009 | CN201192774Y Equipment for longitudinally hot-rolling small diameter thin wall seamless steel pipe with fewer stands |
| 02/04/2009 | EP1593441B1 Seamless metal tube producing method |
| 01/28/2009 | CN201186385Y Double machine frame oblique hot rolling minor diameter seamless steel pipe equipment |
| 01/28/2009 | CN201186287Y Complex cavity water cooling core rod |
| 01/28/2009 | CN101352796A Novel technique for producing mandrel bar |
| 01/28/2009 | CN101352728A Novel technique for producing large-sized seamless steel pipe |
| 01/27/2009 | US7481093 Punching process with magnetostrictive power source |
| 01/14/2009 | EP2014747A1 Lubricant composition for hot plastic working and method of hot plastic working with the same |
| 01/14/2009 | EP2014378A1 Process for producing stainless-steel pipe |
| 01/14/2009 | CN101346194A Plug used in boring machine |
| 01/13/2009 | CA2550913C Cold rolling process for metal tubes |
| 01/06/2009 | CA2550931C Cold rolling process for metal tubes |
| 01/06/2009 | CA2508446C Seamless metal tube producing method |
| 12/31/2008 | EP2008731A1 Mandrel bar for rolling of high alloy, method for surface treatment of the mandrel bar, method for manufacture of the mandrel bar, and method for operation of seamless steel pipe production apparatus |
| 12/31/2008 | EP2007533A1 Mandrel holder head with release device |
| 12/24/2008 | CN201168726Y Centring device of rolling steel pipe |
| 12/18/2008 | WO2008152747A1 METHOD OF USING Cr-PLATED MANDREL BAR FOR HOT ROLLING |
| 12/17/2008 | EP2002903A2 Method for production of seamless pipe, and oxidizing gas supply apparatus |
| 12/10/2008 | EP2000525A1 Lubricant for hot plastic working and powder lubricant composition for hot working |
| 12/03/2008 | EP1775038B1 Process for producing seamless steel pipe |
| 11/05/2008 | CN201143514Y Three-roller tube-rolling machine with two threading-bar mode |
| 11/05/2008 | CN201143513Y Perforation head unit connector |
| 11/05/2008 | CN101298899A Lubricant oil filter |
| 11/05/2008 | CN100430181C Novel process for manufacturing retained mandrel for continuous rolling of steel pipe |
| 10/15/2008 | CN100425359C Moveable short-core bar device collocated on the output of mannesmann tube mill |
| 09/24/2008 | CN201120397Y Mandrel lubricating device |
| 09/24/2008 | CN201120396Y Core rod slaving mechanism of three-roller hot finishing machine for weldless steel tube |
| 09/24/2008 | CN201120395Y Rolled tube machine core stick inserting apparatus |
| 09/10/2008 | CN101259589A Two-stand angularly hot rolling minor diameter seamless steel tube rolling technique and equipment thereof |
| 09/10/2008 | CN101259588A Fewer stands longitudinal hot rolling minor diameter thin wall seamless steel tube rolling technique and equipment thereof |
| 09/03/2008 | CN101254510A Centering device of roller milling steel tube |
| 08/27/2008 | EP1961497A1 Plug used in boring machine |
| 08/14/2008 | WO2008096708A1 Process for producing plug for use in piercing/rolling raw metallic material, process for producing metallic tube, and plug for use in piercing/rolling raw metallic material |
| 08/06/2008 | CN101234397A Cold rolling coning pipe fitting mold |
| 07/30/2008 | CN100406144C Cold rolling process for metal tubes |
| 07/23/2008 | CN101224469A Mobile mandril cooling and lubricating device |
| 07/23/2008 | CN100404151C Seamless metal tube producing method |
| 07/10/2008 | WO2008081864A1 Method of application of lubricating oil to mandrel bar, method of control of thickness of lubricating oil on mandrel bar, and method of production of seamless steel pipe |
| 07/09/2008 | CN101214500A Tube-rolling machine core rod hydraulic restraint device |
| 07/09/2008 | CN101214499A Three-roller tube-rolling machine with two threading-bar mode |
| 07/02/2008 | CN201079795Y Fast replacing device for plug |
| 06/25/2008 | CN101208160A Process for producing seamless tube |
| 06/25/2008 | CN101204713A Disconnection device for punch refrigerant top |
| 06/12/2008 | US20080134742 Seamless tube piercing/rolling plug, and seamless tube producing method using same |
| 06/11/2008 | CN101198420A Boring machine, plug, and method of manufacturing seamless steel tube |
| 06/11/2008 | CN101195126A Ceramic-metallic composite cladding layer top head for tube inserting machine and method for producing the same |
| 06/10/2008 | US7383710 Seamless tube piercing/rolling apparatus, and seamless tube producing therewith |
| 05/29/2008 | WO2008062752A1 Manufacturing method for seamless pipe |
| 05/07/2008 | EP1917371A1 Nickel-base alloy and articles made therefrom |
| 04/30/2008 | CN201052516Y Tube rolling machine hollow heart plug |