| 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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| 04/16/2008 | CN201046453Y Movable short mandrel device of mann's pipe-mill |
| 04/16/2008 | CN101163559A Manufacturing method of seamless pipe and cleaning equipment |
| 04/09/2008 | EP1908533A1 Boring machine, plug, and method of manufacturing seamless steel tube |
| 03/26/2008 | CN101151355A Sintering inhibitor for hot plastic working of steel |
| 02/28/2008 | WO2008023563A1 Mandrel bar cleaning facility |
| 02/27/2008 | EP1892283A1 Seizing inhibitor for hot plastic working of steel |
| 02/13/2008 | CN100368102C Method of manufacturing seamless tube by three-roll mandrel mill |
| 02/06/2008 | CN201015776Y Cold rolling taper pipe fitting mold |
| 01/30/2008 | CN101112705A Core rod slaving mechanism of 3 - roll thermal precise mill |
| 01/23/2008 | CN201008880Y Adjustable five-lever link gear |
| 01/23/2008 | CN201008879Y Adjustable five-lever link gear |
| 01/02/2008 | EP1872878A1 Process for producing seamless tube |
| 01/02/2008 | CN200998730Y Novel core rod holding device |
| 12/18/2007 | US7308812 Process for producing seamless steel pipe |
| 12/06/2007 | WO2007138914A1 Process for producing seamless stainless-steel pipe |
| 11/28/2007 | CN101078092A Punching head |
| 11/28/2007 | CN101077560A Forging molybdenum plug and preparation method thereof |
| 11/28/2007 | CN101077559A Process for producing piercer point by casting and forging combination |
| 11/21/2007 | EP1857193A1 Method for hot rolling seamless pipes on an inner tool and inner tool |
| 11/21/2007 | CN200977526Y Core rod car rack box resetting device |
| 11/21/2007 | CN200977525Y Pipe expanding and perforating roof bar front extending quantity regulating device |
| 11/14/2007 | EP1854561A1 Process for producing seamless pipe and cleaning equipment |
| 11/14/2007 | CN101070561A Through-hole top-end heat-treatment processing process |
| 11/08/2007 | WO2007126005A1 Process for producing stainless-steel pipe |
| 11/01/2007 | WO2007122972A1 Lubricant composition for hot plastic working and method of hot plastic working with the same |
| 10/31/2007 | CN101062507A Technique for manufacturing mandrel mill by using composite rare earth material |
| 10/30/2007 | US7287411 Die for a tool set for mechanical joining |
| 10/24/2007 | CN101061208A Powdered lubricant composition for hot working and method for manufacturing seamless tubes |
| 10/24/2007 | CN101058139A Welding technology for broken and waste core rod |
| 10/24/2007 | CN100344388C Rolling mill for the fabrication of seamless tubes |
| 10/18/2007 | WO2007116653A1 Lubricant for hot plastic working and powder lubricant composition for hot working |
| 10/11/2007 | WO2007114173A1 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 |
| 10/11/2007 | WO2007114041A1 Method for production of seamless pipe, and oxidizing gas supply apparatus |
| 10/04/2007 | WO2007110416A1 Mandrel holder head with release device |
| 09/26/2007 | CN101041164A Moveable short-core bar device collocated on the output of mannesmann tube mill |
| 08/15/2007 | CN2933627Y Tube mill mandrel shelf |
| 08/08/2007 | EP1816184A1 Powder lubricant composition for hot working and process for producing seamless tube |
| 08/02/2007 | US20070175264 Punching machine with spring-supported work support |
| 07/12/2007 | US20070157691 Process for producing seamless steel pipe |
| 06/28/2007 | US20070149413 Lubricant composition for hot forming |
| 06/14/2007 | WO2007066631A1 Plug used in boring machine |
| 05/23/2007 | CN1968766A Process for producing seamless steel pipe |
| 05/09/2007 | CN2897471Y Hydraulic bridle |
| 04/18/2007 | EP1775038A1 Process for producing seamless steel pipe |
| 03/29/2007 | DE102005044777A1 Verfahren und Walzwerk zur Herstellung eines nahtlosen Rohres A method and rolling mill for producing a seamless pipe |
| 03/14/2007 | CN1929933A Seamless tube piercing/rolling plug, seamless tube producing apparatus, and seamless tube producing method therewith |
| 02/15/2007 | WO2007018593A1 Nickel-base alloy and articles made therefrom |
| 01/23/2007 | US7165431 Cr-plated mandrel bar for manufacturing hot seamless tube and method of manufacturing the same |
| 01/11/2007 | US20070006626 Seamless tube piercing/rolling plug, seamless tube piercing/rolling apparatus, and seamless tube producing method therewith |
| 01/10/2007 | CN2855562Y Rotating polish-rod apparatus of two-roller type cold rolling mill |
| 01/10/2007 | CN1891364A Cold rolling process for metal tubes |
| 01/10/2007 | CN1293953C Feed-through rod locating method and apparatus |
| 01/03/2007 | CN1890356A Lubricant composition for hot forming |
| 12/21/2006 | WO2006134957A1 Boring machine, plug, and method of manufacturing seamless steel tube |
| 12/20/2006 | CN2848395Y Graphite lubricating equipment for seamless steel pipe rolling core rod |
| 12/06/2006 | EP1728566A1 Seamless pipe pierce-rolling plug, seamless pipe producing device and seamless pipe producing method using them |
| 11/22/2006 | CN2838783Y Bar releasing device |
| 11/15/2006 | CN1863608A Method of manufacturing seamless tube by three-roll mandrel mill |
| 11/01/2006 | CN2832336Y Dynamically balanced two-roller heavy caliber cone retaining-mandrel puncher and tube mill |
| 10/25/2006 | CN1281351C Extrusion die for manufacturing tube with small hollow portions, mandrel used for said extrusion die, and multi-hollowed tube manufactured by using said extrusion die |
| 10/18/2006 | CN2827568Y Rod lifting device in limiting trolley |
| 10/18/2006 | CN2827567Y Connection structure between fastening block and bolt of limiting trolley |
| 10/18/2006 | CN2827566Y Lateral moving device of rod jack-up trolley |
| 10/12/2006 | WO2006106961A1 Process for producing seamless tube |
| 10/12/2006 | WO2006106637A1 Seizing inhibitor for hot plastic working of steel |
| 10/11/2006 | CN1845982A Lubricant composition for seamless steel pipe working |
| 10/04/2006 | EP1707618A1 Lubricant composition for hot forming |
| 10/04/2006 | CN1840286A Novel process for manufacturing retained mandrel for continuous rolling of steel pipe |
| 08/31/2006 | WO2006090718A1 Process for producing seamless pipe and cleaning equipment |
| 08/30/2006 | CN2810792Y Novel slide device of two-roller periodic cold rolling mill |
| 07/19/2006 | CN1264618C Method for making metal pipe and planetary skew rolling mill |
| 07/12/2006 | EP1679136A1 Method of manufacturing seamless tube by three-roll mandrel mill |
| 06/28/2006 | CN2790616Y Molybdenum top head for passing rolled pipe |
| 06/28/2006 | CN1795061A Cr-plated mandrel bar for manufacturing hot seamless tube and method of manufacturing the same |
| 06/22/2006 | US20060130548 Cr-plated mandrel bar for manufacturing hot seamless tube and method of manufacturing the same |
| 06/14/2006 | CN1788101A Tool steel for hot working, tool for hot working and plug for producing seamless pipe |
| 06/08/2006 | DE102004059092A1 Seamless pipe, of high heat resistant steel formed from a block shaped into a hollow body with the base pierced to form a thick-wall pipe while hot to be rolled to the final dimensions and tempered |
| 06/08/2006 | DE102004059090A1 Internal tool for accommodating pipe, has connection pin connected with mandrel bar end which is designed as sleeve section that exhibits conically tapered thread free section, where connection is carried out by screw connection |
| 06/07/2006 | EP1666576A1 Lubricant composition for seamless steel pipe working |
| 06/07/2006 | CN1781617A Core stick graphite lubricating system for seamless steel pipe rolling |
| 05/31/2006 | CN1778485A Three-roller planetary press movement bar material for press bronze and bronze alloy piping material |
| 05/26/2006 | WO2006054768A1 Powder lubricant composition for hot working and process for producing seamless tube |
| 05/24/2006 | CN2783105Y Lubricating equipment |
| 03/22/2006 | EP1637245A1 Cr-PLATED MADNREL BAR FOR MANUFACTURING HOT SEAMLESS TUBE AND METHOD OF MANUFACTURING THE SAME |
| 03/08/2006 | EP1632583A1 Tool steel for hot working, tool for hot working and plug for producing seamless pipe |
| 02/01/2006 | CN2754758Y Puncturing expanding head |
| 01/25/2006 | CN1726100A Seamless metal tube producing method |
| 01/24/2006 | US6988387 Making method for seamless metallic tube |
| 01/04/2006 | CN2749592Y Hollow reeling top head used for seamless steel pipe reeling machine |
| 12/29/2005 | WO2005123289A1 Process for producing seamless steel pipe |
| 12/20/2005 | US6976377 Method of and apparatus for producing tubes of metal |
| 11/10/2005 | DE4428530C5 Verfahren und Walzgerüst zum Schrägwalzen von Rohren Process and roll stand for skew rolling of tubes |
| 11/09/2005 | EP1593441A1 Seamless metal tube producing method |
| 10/19/2005 | CN1683093A Tool for thermal processing |
| 09/29/2005 | US20050210944 Making method for seamless metallic tube |
| 09/28/2005 | CN1672824A Feed-through rod locating method and apparatus |
| 09/22/2005 | WO2005087401A1 Seamless pipe pierce-rolling plug, seamless pipe producing device and seamless pipe producing method using them |
| 08/09/2005 | CA2239024C A unit for rolling pipes on a mandrel |
| 06/23/2005 | WO2005056740A1 Lubricant composition for hot forming |
| 06/01/2005 | EP1463591B1 Method and rolling stand for producing rods, bar stock or seamless tubes |