ClassID:

119040

C21D8/105 - page 2 - CPC Classification

Classification description:

Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys

Recent Application in this class:
#301
20150050513
2015-02-19

Method for manufacturing hollow shafts

#302
20150047735
2015-02-19

Method for heat treating a metal tube or pipe, metal tube or pipe, and heat treatment furnace

#303
20150041030
2015-02-12

Method for producing high-strength steel material excellent in sulfide stress cracking resistance

#304
20140352836
2014-12-04

High-strength seamless steel pipe for oil well use having excellent resistance to sulfide stress cracking

#305
20140311632
2014-10-23

METHOD FOR PRODUCING STEEL TUBE FOR AIR BAG

#306
20140299236
2014-10-09

High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes

#307
20140299235
2014-10-09

Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes

#308
20140299218
2014-10-09

Process for manufacturing a bellows and/or bellows

#309
20140272448
2014-09-18

High performance material for coiled tubing applications and the method of producing the same

#310
20140254736
2014-09-11

Method for producing, from a preform made of austenitic stainless steel with a low carbon content, a wear-resistant and corrosion-resistant cladding for a nuclear reactor, corresponding cladding and corresponding control cluster

#311
20140205487
2014-07-24

Oil-well steel pipe having excellent sulfide stress cracking resistance

#312
20140202600
2014-07-24

Method of making quenched and tempered steel pipe with high fatigue life

#313
20140190594
2014-07-10

Classes of steels for tubular products

#314
20140144552
2014-05-29

Thick high-tensile-strength hot-rolled steel sheet having excellent low-temperature toughness and manufacturing method thereof

#315
20140137992
2014-05-22

Thick-walled high-strength seamless steel pipe with excellent sour resistance for pipe for pipeline, and process for producing same

#316
20140083576
2014-03-27

Austenitic alloy pipe and method for producing the same

#317
20140060708
2014-03-06

High elastic modulus shafts and method of manufacture

#318
20140057121
2014-02-27

High strength steel having good toughness

#319
20140041770
2014-02-13

Low C-high Cr 862 MPa-class steel tube having excellent corrosion resistance and a manufacturing method thereof

#320
20130264123
2013-10-10

Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same

#321
20130199674
2013-08-08

Ultra high strength steel having good toughness

#322
20130174949
2013-07-11

Austenitic high Mn stainless steel and method production of same and member using that steel

#323
20130118632
2013-05-16

Oil country tubular goods with dual phase structure and producing method thereof

#324
20130092280
2013-04-18

Electric resistance welded oil country tubular goods and manufacturing method of electric resistance welded oil country tubular goods

#325
20130056115
2013-03-07

Automobile chassis part excellent in low cycle fatigue characteristics and method of production of same

#326
20130037162
2013-02-14

Thick welded steel pipe excellent in low temperature toughness, manufacturing method of thick welded steel pipe excellent in low temperature toughness, and steel plate for manufacturing thick welded steel pipe

#327
20130004787
2013-01-03

SEAMLESS STEEL PIPE FOR STEAM INJECTION AND METHOD FOR MANUFACTURING THE SAME

#328
20130000790
2013-01-03

Seamless steel pipe for line pipe and method for manufacturing the same

#329
20120328897
2012-12-27

High-strength stainless steel for oil well and high-strength stainless steel pipe for oil well

#330
20120305122
2012-12-06

WELDED STEEL PIPE FOR LINEPIPE HAVING HIGH COMPRESSIVE STRENGTH AND HIGH FRACTURE TOUGHNESS AND MANUFACTURING METHOD THEREOF

#331
20120291907
2012-11-22

High-strength welded steel pipe and method for producing the same

#332
20120285576
2012-11-15

Welded steel pipe for linepipe with high compressive strength and manufacturing method thereof

#333
20120279607
2012-11-08

Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor

#334
20120273095
2012-11-01

Method of production of high-strength hollow bodies from multiphase martensitic steels

#335
20120267014
2012-10-25

Method for manufacturing seamless steel pipe for line pipe and seamless steel pipe for line pipe

#336
20120211132
2012-08-23

Method of making ultra high strength steel having good toughness

#337
20120211131
2012-08-23

High strength steel having good toughness

#338
20120204994
2012-08-16

Heavy wall steel pipes with excellent toughness at low temperature and sulfide stress corrosion cracking resistance

#339
20120199255
2012-08-09

High strength steel pipes with excellent toughness at low temperature and sulfide stress corrosion cracking resistance

#340
20120186686
2012-07-26

Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment

#341
20120118441
2012-05-17

Method of manufacturing heavy-wall seamless steel pipe

#342
20120103459
2012-05-03

HIGH FATIGUE SERVICE LIFE QUENCHING/TEMPERING STEEL TUBE AND MANUFACTURING METHOD THEREFOR

#343
20120070682
2012-03-22

Hollow seamless pipe for high-strength springs

#344
20120047981
2012-03-01

Method for producing seamless tubes

#345
20120042992
2012-02-23

Method for manufacturing seamless pipes

#346
20120031532
2012-02-09

Steel plate for line pipe excellent in strength and ductility and method of production of same

#347
20120031530
2012-02-09

Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well

#348
20120031516
2012-02-09

Axle Sleeve Manufacturing Process

#349
20120024430
2012-02-02

High-strength stainless steel pipe

#350
20120018056
2012-01-26

THICK-WALLED HIGH-STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT HYDROGEN INDUCED CRACKING RESISTANCE AND MANUFACTURING METHOD THEREOF

#351
20120018028
2012-01-26

High strength steel pipe for low-temperature usage having excellent buckling resistance and toughness of welded heat affected zone and method for producing the same

#352
20120009435
2012-01-12

Bent metal member and a method for its manufacture

#353
20120003117
2012-01-05

Process for manufacturing steel blanks

#354
20110308669
2011-12-22

METHOD FOR MANUFACTURING METAL PIPE

#355
20110297279
2011-12-08

Method for producing seamless steel pipe for oil wells excellent in sulfide stress cracking resistance

#356
20110290377
2011-12-01

Method for producing duplex stainless steel pipe

#357
20110284137
2011-11-24

Thick high-tensile-strength hot-rolled steel sheet having excellent low-temperature toughness and manufacturing method thereof

#358
20110272067
2011-11-10

Method and apparatus for producing steel pipes having particular properties

#359
20110253267
2011-10-20

HIGH STRENGTH STEEL PIPE OF API X65 GRADE OR HIGHER AND MANUFACTURING METHOD THEREFOR

#360
20110253265
2011-10-20

QUENCHED AND TEMPERED STEEL PIPE WITH HIGH FATIGUE LIFE, AND ITS MANUFACTURING METHOD

#361
20110155289
2011-06-30

RESIDUAL STRESS IMPROVING METHOD FOR PIPE

#362
20110024005
2011-02-03

Method for producing two-phase stainless steel pipe

#363
20110017355
2011-01-27

FERRITIC HEAT-RESISTANT STEEL

#364
20110011834
2011-01-20

Linepipe steel

#365
20110000584
2011-01-06

Process for forming steel

#366
20100330388
2010-12-30

Welded steel pipe for high strength line pipe superior in low temperature toughness and method of production of the same

#367
20100319814
2010-12-23

BAINITIC STEELS WITH BORON

#368
20100193087
2010-08-05

MARTENSITIC STAINLESS STEEL SEAMLESS PIPE FOR OIL COUNTRY TUBULAR GOODS AND METHOD FOR MANUFACTURING THE SAME

#369
20100193086
2010-08-05

Method for manufacturing martensitic stainless steel pipe or tube

#370
20100193083
2010-08-05

HYDROGEN-RESISTANT HIGH STRENGTH MATERIAL AND METHOD FOR PRODUCING THE SAME

#371
20100170320
2010-07-08

Method for manufacturing a high alloy pipe

#372
20100119860
2010-05-13

Steel pipe excellent in deformation characteristics and method of producing the same

#373
20100104468
2010-04-29

Low carbon resulfurized free-machining steel having high machinability

#374
20100096048
2010-04-22

655 MPa grade martensitic stainless steel having high toughness and method for manufacturing the same

#375
20100068549
2010-03-18

Seamless precision steel tubes with improved isotropic toughness at low temperature for hydraulic cylinders and process for obtaining the same

#376
20100051143
2010-03-04

Case Hardening Steel Tube Having Improved Workability and a Process for its Manufacture

#377
20100047108
2010-02-25

Process for manufacturing steel blanks

#378
20100037992
2010-02-18

Method for transforming steel blanks

#379
20090277543
2009-11-12

PRODUCTION SYSTEM OF WELDABLE AND STAINLESS TUBULAR STRUCTURES WITH HIGH MECHANICAL STRENGTH AND PRODUCT OBTAINED THEREFROM

#380
20090277539
2009-11-12

Steel for Warm Working, Warm Working Method Using the Steel, and Steel Material and Steel Component Obtainable Therefrom

#381
20090250146
2009-10-08

High Strength Thick-Gauge Electric-Resistance Welded Steel Pipe Excellent in Hardenability, Hot Workability and Fatigue Strength and Method of Production of the Same

#382
20090246064
2009-10-01

Austenitic stainless steel tube for boiler with excellent resistance to high temperature steam oxidation

#383
20090114318
2009-05-07

Seamless steel pipe for line pipe and a process for its manufacture

#384
20090104069
2009-04-23

LINEPIPE STEEL

#385
20090098008
2009-04-16

Martensitic stainless steel oil country tubular good

#386
20090071221
2009-03-19

Mandrel bar for high-alloy rolling, method for surface treating a mandrel bar, method for producing mandrel bar, and method for operating seamless pipe mill

#387
20090065102
2009-03-12

High Strength Seamless Steel Pipe for Machine Structure Use Superior in Toughness and Weldability, and Method of Production of The Same

#388
20090033007
2009-02-05

Martensitic stainless steel tube and manufacturing method thereof

#389
20090032150
2009-02-05

Oil country tubular good for expansion in well and manufacturing method thereof

#390
20090007991
2009-01-08

Ferritic Heat-Resistant Steel

#391
20090004040
2009-01-01

Ferritic stainless steel sheet for raw material pipe for bellows pipe

#392
20090000709
2009-01-01

Method for producing high chromium seamless pipe or tube

#393
20080314481
2008-12-25

High-strength steel for seamless, weldable steel pipes

#394
20080279716
2008-11-13

Metal material having excellent metal dusting resistance

#395
20080277398
2008-11-13

SEAM-WELDED 36% NI-FE ALLOY STRUCTURES AND METHODS OF MAKING AND USING SAME

#396
20080219878
2008-09-11

Seamless steel pipe for line pipe and a process for its manufacture

#397
20080216928
2008-09-11

Method for manufacturing seamless steel pipe for line pipe

#398
20080121318
2008-05-29

Method for producing seamless steel pipe

#399
20080112839
2008-05-15

655 Mpa Grade Martensitic Stainless Steel Having High Toughness and Method for Manufacturing the Same

#400
20080017284
2008-01-24

Steel for oil well pipe excellent in sulfide stress cracking resistance

#401
20070267110
2007-11-22

Method for making high-strength steel pipe, and pipe made by that method

#402
20070246136
2007-10-25

Method of manufacturing a martensitic stainless steel pipe

#403
20070137736
2007-06-21

Low alloy steel for oil well pipes having excellent sulfide stress cracking resistance

#404
20070125462
2007-06-07

Steel plates for ultra-high-strength linepipes and ultra-high-strength linepipes having excellent low-temperature toughness and manufacturing methods thereof

#405
20070101789
2007-05-10

Seamless steel tubes and method for producing the same

#406
20070062238
2007-03-22

Method for manufacturing seamless steel pipe or tube

#407
20070001483
2007-01-04

Metal tube for reinforcing car body and car body reinforcement therewith

#408
20060266448
2006-11-30

Seamless steel pipe for oil wells excellent in sulfide stress cracking resistance and method for producing the same

#409
20060201592
2006-09-14

High-strength steel pipe of API X65 grade or higher

#410
20060169375
2006-08-03

Method for manufacturing martensitic stainless steel tube

#411
20060130945
2006-06-22

Steel pipe for an airbag system

#412
20050257861
2005-11-24

Dual seam-welded air hardenable steel tubing and structural members

#413
20050115647
2005-06-02

Martensitic stainless steel seamless pipe and a manufacturing method thereof

#414
20050098244
2005-05-12

Method for manufacturing metallic bellows

#415
20050087271
2005-04-28

Reinforced member

#416
20050000601
2005-01-06

Steel pipe for an airbag system and a method for its manufacture