| Patents for B21B 23 - Tube-rolling not restricted to methods provided for in only one of groups , e.g. combined processes (649) |
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| 10/25/2000 | EP1046435A1 Piercing mill and method of changing cannon |
| 09/06/2000 | CN2394733Y Aluminium rolling and forming device for aluminium plastic composite pipe |
| 08/30/2000 | CN2393662Y Apparatus for cold rolling metal pipes |
| 08/02/2000 | EP0725727B1 Method of making machine-engraved seamless tube |
| 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 |
| 05/17/2000 | CN2378136Y Groove block for cold pilger mill |
| 04/20/2000 | DE19838673C1 Verfahren zur Herstellung hochfester und hochzäher Stahlprofilrohre und Anlage zu dessen Durchführung Process for the preparation of high-strength and high toughness steel tubes and profile system for its implementation |
| 02/23/2000 | EP0980914A2 Process and device for manufacturing very ductile profiled steel pipes |
| 02/16/2000 | EP0979688A1 Method of manufacturing copper tubes |
| 02/15/2000 | US6024808 Seamless steel pipe manufacturing method and equipment |
| 10/07/1999 | DE19814919A1 Production of long internally and/or externally coated small diameter pipes, especially drinking water pipes or fittings |
| 08/17/1999 | US5938865 Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
| 07/13/1999 | CA2149305C Method of making machine-engraved seamless tube |
| 04/22/1999 | WO1999019090A1 Piercing mill and method of changing cannon |
| 02/23/1999 | US5873960 Cooling cast billet to below a transformation temperature, heating and piercing to form hollow shell, elongation and finish rolling, recrystallizing, quenching, tempering along single continuous process line; simplification |
| 02/03/1999 | EP0764063B1 Method of producing a seamless hot-finished tube |
| 10/22/1998 | DE19732444C1 Prevention of back end losses of hot rolled pipes produced on Assel roll stands |
| 07/29/1998 | CN1189111A Seamless steel pipe manufacturing method and equipment |
| 05/20/1998 | EP0842715A1 Seamless steel pipe manufacturing method and equipment |
| 04/30/1998 | WO1998017835A1 Steel containing nickel and a method for producing rolling and forging products from such steel |
| 04/30/1998 | DE19645139A1 Ni-haltiger Stahl und Verfahren zur Herstellung von Walz- und Schmiedeprodukten aus diesem Stahl Ni-containing steel and process for the production of rolled and forged steel products in this |
| 04/28/1998 | US5743127 Round steel bar guide apparatus and method |
| 03/11/1998 | EP0828007A1 Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
| 01/28/1998 | EP0725727A4 Method of making machine-engraved seamless tube |
| 01/15/1998 | WO1998001589A1 Process for producing weldless steel pipes |
| 12/31/1997 | CN1168821A Non skin-pass tech. for medium carbon, micro-alloy, seamless steel tube |
| 11/13/1997 | DE19628715C1 Seamless steel pipe production |
| 10/30/1997 | WO1997039843A1 Seamless steel pipe manufacturing method and equipment |
| 10/01/1997 | CN1161010A Method of manufacturing seamless steel pipes and manufacturing equipment therefor |
| 08/06/1997 | EP0787541A1 Method of manufacturing seamless steel pipes and manufacturing equipment therefor |
| 07/23/1997 | CN1154880A Mfg. method for square steel pipe and mfg. method for circular steel pipe |
| 07/01/1997 | US5642638 Process for the rolling of hallow ingots on a assel rolling mill |
| 06/11/1997 | CN2255885Y Metal sheathing apparatus |
| 05/28/1997 | CN1150767A Method of producing seamless hot-finished tube |
| 04/03/1997 | DE19527795A1 Cold-rolling pipe mill |
| 03/26/1997 | EP0764063A1 Method of producing a seamless hot-finished tube |
| 03/12/1997 | EP0761826A2 Method for manufacturing seamless pipes |
| 11/21/1996 | WO1996036742A1 Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
| 08/14/1996 | EP0725727A1 Method of making machine-engraved seamless tube |
| 07/24/1996 | EP0423159B1 Method and arrangement for reducing the outer diameter and wall thickness of an essentially cylindrical hollow rough-pierced tube blank by rolling |
| 07/10/1996 | EP0720875A1 Round steel bar guide apparatus and method |
| 06/12/1996 | CN1124181A Integrative rolling technology for large pressure steel pipe |
| 05/02/1996 | WO1996012574A1 Method of manufacturing seamless steel pipes and manufacturing equipment therefor |
| 03/27/1996 | EP0703014A1 Method for rolling hollow blocks in an Assel rolling mill |
| 03/13/1996 | CN1118286A Method of rolling hollow pipe block in rolling machine |
| 01/04/1996 | DE4423683A1 Mfg. of hot rolled seamless steel tubes avoiding formation of rolled-in laps |
| 01/02/1996 | US5479805 Two-high cross rolling mill with guide disks |
| 12/21/1995 | WO1995034387A1 Method of producing a seamless hot-finished tube |
| 12/21/1995 | CA2192970A1 Method of producing a seamless hot-finished tube |
| 12/20/1995 | CN1113458A Production process for hot-rolled boiler pipe of 12Cr2MoWVTiB steel alloy |
| 11/16/1995 | DE4431410C1 Method for rolling hollow block on roller mechanism |
| 08/15/1995 | US5440911 Pre-reduction equipment and method |
| 05/04/1995 | DE4335063C1 Cold pilger rolling mill for the cold-rolling of tubes (pipes) |
| 04/06/1995 | DE4332140A1 Method and apparatus for coiling and further treatment of tubes made of nonferrous metals, especially copper and copper alloys |
| 11/17/1994 | DE4315619A1 Method for producing an electrically conductive profiled strip, and an electrically conductive profiled strip |
| 07/26/1994 | CA2020728C Adjustable guide for rotating cylindrical member |
| 07/12/1994 | US5328587 Engraving funnel shaped holes in metal tubes and removal |
| 06/15/1994 | EP0601680A1 Method of guiding a rough-pierced tube blank |
| 05/26/1994 | WO1994011183A1 Method of making machine-engraved seamless tube |
| 03/10/1994 | DE4308721C1 Skew rolling mill with driven guide wheels - has automatic adjusting and swivelling system to facilitate guide wheel exchange |
| 03/02/1994 | EP0156922B2 Cross helical rolling mill for seamless steel tubes. |
| 12/15/1993 | CN1079420A Hot rolled compound anticorrosive hollow rock-drill steel |
| 12/15/1993 | CA2087758A1 Tube loading sleeve for pilger mill |
| 11/02/1993 | US5257716 For transferring a metallic tubular product |
| 08/25/1993 | EP0557040A1 Sleeve for protecting a tube inside during loading onto pilger mill mandrel |
| 08/25/1993 | EP0556635A2 Ultrasonic apparatus for measuring wall thickness, particularly for extruded tubes |
| 06/03/1993 | DE4220625C1 Rods, pipes, shaped pieces etc. - have surface depressions applied, esp. by ball blasting which are filled with lubricant prior to cold-drawing |
| 05/19/1993 | CN1020682C Improved hot-rolling process for seamless tubes with preliminary diameter reduction of semifinished products |
| 03/23/1993 | CA1314793C Device for applying a descaling agent to the inner surface of a hollow billet |
| 03/17/1993 | CN1020073C Device for applying descaling agent to internal surface of bloom |
| 02/23/1993 | CA1313780C Method for manufacturing tubes, bars and strips |
| 02/16/1993 | US5186035 Insertion of removable protective sleeve for minimization of defects on inner surfaces of zircaloy tubing |
| 12/02/1992 | CN1019276B Method and apparatus for tube-rolling of reducing tube bloom extremity |
| 09/01/1992 | US5142893 Tube mill |
| 06/30/1992 | US5125251 Method and apparatus to reduce the outer diameter and wall thickness of a hollow tube blank by rolling |
| 05/05/1992 | US5109689 Hot-rolling process for seamless tubes with preliminary diameter reduction of the semifinished products |
| 04/07/1992 | US5102468 Used in the production of seamless tubes |
| 08/20/1991 | US5040399 Method of fabricating box section from steel with walls that differ in thickness |
| 07/30/1991 | CA2008853A1 Method of manufacturing of high-strength seamless steel tubes |
| 06/12/1991 | CN1052063A Improved hot-rolling process for seamless tubes with preliminary diameter reduction of semifinished products |
| 06/05/1991 | EP0430909A2 Improved hot-rolling process for sealess tubes with preliminary diameter reduction of the semifinished products |
| 04/10/1991 | EP0421575A1 Adjustable guide for rotating cylindrical member |
| 03/26/1991 | US5001916 Method for the calibrated cross-section reduction of a workpiece rotating during such method. |
| 03/12/1991 | US4998341 Method for making mineral insulated metal sheathed cables |
| 02/26/1991 | US4995252 Method and apparatus for internally enhancing heat exchanger tubing |
| 01/02/1991 | EP0405065A2 Method of producing rectangular hollow sections of steel with differential wall thickness |
| 11/06/1990 | US4967579 Adjustable guide for rotating cylindrical member |
| 10/24/1990 | EP0393264A1 Method for making mineral insulated metal sheathed cables |
| 10/18/1990 | CA2014464A1 Method for making mineral insulated metal sheathed cables |
| 04/11/1990 | EP0362502A2 Method for sizing the cross-section of a work piece by reduction during its rotation |
| 02/28/1990 | CN1039981A Method and apparatus for tube-rolling of reducing tube bloom extremity |
| 01/25/1990 | WO1990000449A1 Method and arrangement for reducing the outer diameter and wall thickness of an essentially cylindrical hollow rough-pierced tube blank by rolling |
| 10/31/1989 | US4876870 Cold rolling |
| 09/26/1989 | CA1261684A1 Process for application of a free-flowing material on the inner surface of a tube blank and device for performing the process |
| 06/07/1989 | EP0156922B1 Cross helical rolling mill for seamless steel tubes. |
| 04/19/1989 | CN1032422A Device for applying descaling agent to internal surface of bloom |
| 04/05/1989 | EP0309945A2 Device for applying a descaling agent to the inner surface of a loop |
| 04/04/1989 | CA1251954A1 Cross helical rolling mill |
| 03/07/1989 | US4809423 Making seamless steel pipes |
| 02/01/1989 | EP0301377A1 Conical sleeve for mounting a rolling ring |