ClassID:

119082

C21D9/14 - CPC Classification

Classification description:

Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes

Recent Application in this class:
#1
20260085371
2026-03-26

HEAT TREATED COILED TUBING

#2
20250382689
2025-12-18

STAINLESS STEEL SEAMLESS PIPE AND PRODUCTION METHOD THEREFOR

#3
20250320592
2025-10-16

STAINLESS STEEL SEAMLESS PIPE AND PRODUCTION METHOD THEREFOR

#4
20250101558
2025-03-27

HIGH-STRENGTH PIPE RESISTANT TO SODIUM HYDROXIDE CORROSION AND MANUFACTURING METHOD THEREFOR

#5
20240309480
2024-09-19

DUPLEX STAINLESS STEEL PIPE AND METHOD FOR MANUFACTURING SAME

#6
20240247351
2024-07-25

METHOD OF FORMING AND HEAT TREATING COILED TUBING

#7
20240150862
2024-05-09

STEEL PIPE FOR HIGH-PRESSURE HYDROGEN, HIGH-PRESSURE HYDROGEN VESSEL, AND METHOD FOR MANUFACTURING SAID STEEL PIPE

#8
20240093809
2024-03-21

High pressure tube and method of manufacturing the same

#9
20240093324
2024-03-21

STEEL PIPE FOR PRESSURE PIPING AND STARTING MATERIAL FOR STEEL PIPE

#10
20240093323
2024-03-21

STEEL COMPOSITION, WROUGHT ARTICLE AND MANUFACTURING METHOD OF A SEAMLESS PRESSURE VESSEL FOR COMPRESSED GAS

#11
20230392224
2023-12-07

Linepipe Steel With Enhanced Sulfide Stress Cracking Resistance

#12
20230357876
2023-11-09

Method of Manufacturing High Strength Steel Tubing from a Steel Composition and Components Thereof

#13
20220025504
2022-01-27

Cast product having alumina barrier layer

#14
20210317556
2021-10-14

Martensitic stainless seamless steel pipe

#15
20210292865
2021-09-23

Fabrication method of tubular member

#16
20210002749
2021-01-07

Pipe element for gas pressure vessel, and gas pressure vessel

#17
20200283866
2020-09-10

Martensitic stainless steel seamless pipe for oil country tubular goods, and method for manufacturing same

#18
20200255926
2020-08-13

Steel alloy with high energy absorption capacity and tubular steel product

#19
20200240571
2020-07-30

Super-long thermal insulation steel jacket pipe and machining process thereof

#20
20200165693
2020-05-28

Method for Producing a Wear-Resistant Steel Pipe, Wear-Resistant Steel Pipe, and Use of Such a Steel Pipe

#21
20200102633
2020-04-02

Method of forming and heat treating coiled tubing

#22
20190360064
2019-11-28

HIGH PERFORMANCE MATERIAL FOR COILED TUBING APPLICATIONS AND THE METHOD OF PRODUCING THE SAME

#23
20190360063
2019-11-28

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

#24
20190071749
2019-03-07

Component manufacturing method and component

#25
20190040509
2019-02-07

Nickel-based alloy tubes and method for production thereof

#26
20180320802
2018-11-08

Mechanical processing of high aspect ratio metallic tubing and related technology

#27
20180312937
2018-11-01

Seamless Line Pipe Resistant to Corrosion by CO2/H2S and Sulfate-Reducing Bacteria and Manufacturing Method Thereof

#28
20180291475
2018-10-11

Ultra-high strength and ultra-high toughness casing steel, oil casing, and manufacturing method thereof

#29
20180283584
2018-10-04

Ductile stainless steel pipe and heat pump system comprising the same

#30
20180223388
2018-08-09

Method for producing a strand from stainless steel and strand made of stainless steel

#31
20180223384
2018-08-09

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

#32
20180087482
2018-03-29

Fuel rail

#33
20180057917
2018-03-01

Rolled steel bar for hot forging, hot-forged section material, and common rail and method for producing the same

#34
20180051353
2018-02-22

HIGH PERFORMANCE MATERIAL FOR COILED TUBING APPLICATIONS AND THE METHOD OF PRODUCING THE SAME

#35
20170335421
2017-11-23

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

#36
20170292172
2017-10-12

METHOD FOR HEAT TREATING LONG STEEL PIPES

#37
20170101693
2017-04-13

Seamless steel pipe, method of producing a high strength seamless steel pipe, usage of a seamless steel pipe and perforation gun

#38
20170022581
2017-01-26

Seamless steel tube for fuel injection

#39
20160376677
2016-12-29

Method for producing a tempered seamlessly hot-fabricated steel pipe

#40
20160369759
2016-12-22

Steel pipe for fuel injection pipe and fuel injection pipe using the same

#41
20160355901
2016-12-08

High-strength stainless steel pipe

#42
20160333446
2016-11-17

High alloy for oil well

#43
20160281188
2016-09-29

HEAT TREATED COILED TUBING

#44
20160215359
2016-07-28

High-strength stainless steel pipe

#45
20160193641
2016-07-07

Electric resistance welded steel pipe excellent in weld zone and method of production of same

#46
20160178093
2016-06-23

Cold-rolled narrow strip in the form of flat wire or profiled elements made of a high-strength steel

#47
20160076315
2016-03-17

Method for manufacturing superior 13Cr friction-welded drillrod

#48
20160053355
2016-02-25

Steel material, hydrogen container, method for producing the steel material, and method for producing the hydrogen container

#49
20160053354
2016-02-25

Steel plate for thick-walled steel pipe, method for manufacturing the same, and thick-walled high-strength steel pipe

#50
20160047019
2016-02-18

Method for manufacturing superior 13Cr thickened drillrod

#51
20160024625
2016-01-28

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

#52
20150354022
2015-12-10

Stainless steel seamless pipe for oil well use and method for manufacturing the same

#53
20150226014
2015-08-13

Ultra-high toughness and high strength drill pipe and manufacturing process thereof

#54
20150122376
2015-05-07

Site conditions thick-wall P92 pipe local heat treatment method

#55
20150034049
2015-02-05

Hot-forged section material and common rail

#56
20140299218
2014-10-09

Process for manufacturing a bellows and/or bellows

#57
20140272448
2014-09-18

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

#58
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

#59
20140150734
2014-06-05

Austenitic stainless steel tube

#60
20140083576
2014-03-27

Austenitic alloy pipe and method for producing the same

#61
20130284324
2013-10-31

Steel sheet for an oil sand slurry pipe having excellent abrasion resistance, corrosion resistance, and low-temperature toughness and method for manufacturing same

#62
20130199674
2013-08-08

Ultra high strength steel having good toughness

#63
20130118632
2013-05-16

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

#64
20130098514
2013-04-25

Ni-added steel plate and method of manufacturing the same

#65
20120312159
2012-12-13

MACHINE COMPONENT WITH A CAVITATION RESISTANT COVERING

#66
20120305122
2012-12-06

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

#67
20120282480
2012-11-08

HIGH-TEMPERATURE MATERIAL TRANSFERRING MEMBER

#68
20120211132
2012-08-23

Method of making ultra high strength steel having good toughness

#69
20120186704
2012-07-26

High-strength seamless steel tube, having excellent resistance to sulfide stress cracking, for oil wells and method for manufacturing the same

#70
20120186686
2012-07-26

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

#71
20120125490
2012-05-24

Low yield ratio dual phase steel linepipe with superior strain aging resistance

#72
20120118441
2012-05-17

Method of manufacturing heavy-wall seamless steel pipe

#73
20120024430
2012-02-02

High-strength stainless steel pipe

#74
20110315793
2011-12-29

Fuel injector tip with compressive residual stress

#75
20110308669
2011-12-22

METHOD FOR MANUFACTURING METAL PIPE

#76
20110305595
2011-12-15

HYDROGEN FATIGUE RESISTANT FERRITIC STEEL AND MANUFACTURING METHOD THEREOF

#77
20110290377
2011-12-01

Method for producing duplex stainless steel pipe

#78
20110272134
2011-11-10

High frequency surface treatment methods and apparatus to extend downhole tool survivability

#79
20110259482
2011-10-27

Use of a Steel Alloy for Well Pipes for Perforation of Borehole Casings, and Well Pipe

#80
20110067475
2011-03-24

Process for producing high-alloy seamless tube

#81
20110014083
2011-01-20

STAINLESS STEEL USED FOR OIL COUNTRY TUBULAR GOODS

#82
20110005493
2011-01-13

Method of producing common rail and common rail

#83
20100322814
2010-12-23

High-strength steel sheet excellent in resistance to stress-relief annealing and low temperature joint toughness

#84
20100193087
2010-08-05

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

#85
20100193083
2010-08-05

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

#86
20100170320
2010-07-08

Method for manufacturing a high alloy pipe

#87
20100167086
2010-07-01

Manufacturing method for a steel pipe for fuel injection pipe

#88
20100129680
2010-05-27

UOE STEEL PIPE AND A METHOD FOR ITS MANUFACTURE

#89
20100122753
2010-05-20

CONCRETE SLURRY TRANSPORTING PIPE FOR CONCRETE PUMP-CAR

#90
20100064519
2010-03-18

Method for producing and assembling superheater tubes of steam generators

#91
20100043926
2010-02-25

METHOD FOR PREVENTING CARBON STEEL FROM INTERGRANULAR CRACKING

#92
20100031506
2010-02-11

Method for producing steam generator tube walls consisting primarily of 9-12% martensitic chromium steels

#93
20090301613
2009-12-10

Low Yield Ratio Dual Phase Steel Linepipe with Superior Strain Aging Resistance

#94
20090272469
2009-11-05

Stainless-steel pipe for oil well and process for producing the same

#95
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

#96
20090162239
2009-06-25

Martensitic stainless steel

#97
20090078341
2009-03-26

Steel pipe as fuel injection pipe

#98
20090047166
2009-02-19

Low alloy steel, seamless steel oil country tubular goods, and method for producing seamless steel pipe

#99
20090044882
2009-02-19

Oil well pipe for expandable tubular applications excellent in post-expansion toughness and method of manufacturing the same

#100
20090017238
2009-01-15

Martensitic stainless steel pipe

#101
20080105341
2008-05-08

HEAT TREATMENT OF INLAID PRESSURE VESSELS

#102
20080105340
2008-05-08

Heat Treatment Method of Inlaid Pressure Vessels

#103
20070137736
2007-06-21

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

#104
20060175742
2006-08-10

Track bushing and method and apparatus for producing the same

#105
20060144481
2006-07-06

Track bushing and method and apparatus for producing the same

#106
20060144480
2006-07-06

Track bushing and method and apparatus for producing the same

#107
20050188537
2005-09-01

Ported engine cylinder liner with selectively laser-hardened and induction-hardened bore