ClassID:

119040

C21D8/105 - 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:
#1
20250327160
2025-10-23

DUPLEX STAINLESS STEEL MATERIAL

#2
20250327159
2025-10-23

AUSTENITIC STAINLESS ALLOY MATERIAL

#3
20250327156
2025-10-23

HIGH-STRENGTH PETROLEUM PIPE CASING AND MANUFACTURING METHOD THEREFOR

#4
20250326070
2025-10-23

WELDED STEEL PIPE FOR SLURRY TRANSPORTING AND MANUFACTURING METHOD FOR SAME

#5
20250320574
2025-10-16

PREPARATION METHOD FOR WELDED AND EXTENDED SUPER DUPLEX STAINLESS STEEL SEAMLESS PIPE COIL FOR DEEP-SEA UMBILICAL CABLE

#6
20250253450
2025-08-07

ENCLOSURE FOR BATTERY CELL INCLUDING QUENCH HARDENED STEEL

#7
20250250660
2025-08-07

HOT-ROLLED STEEL SHEET AND METHOD OF PRODUCING SAME, AND ELECTRIC RESISTANCE WELDED STEEL PIPE OR TUBE AND METHOD OF PRODUCING SAME

#8
20250215546
2025-07-03

MARTENSITIC STAINLESS STEEL MATERIAL

#9
20250154617
2025-05-15

STEEL PLATE FOR ADVANCED NUCLEAR POWER UNIT REACTOR CORE SHELL CYLINDER AND MANUFACTURING METHOD FOR STEEL PLATE

#10
20250101558
2025-03-27

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

#11
20250101554
2025-03-27

ELECTRIC RESISTANCE WELDED STEEL PIPE FOR AN AUTOMOTIVE PART, AND METHOD OF PRODUCING AUTOMOTIVE PART

#12
20250066890
2025-02-27

OZONE CORROSION RESISTANT HIGH-STRENGTH TUBE AND MANUFACTURING METHOD THEREFOR

#13
20250011907
2025-01-09

METHOD OF PRODUCING A STEEL SHEET FOR CANS

#14
20250003042
2025-01-02

HIGH-STRENGTH SEAMLESS STAINLESS STEEL PIPE FOR OIL WELLS

#15
20240417835
2024-12-19

MARTENSITIC STAINLESS STEEL SEAMLESS PIPE AND METHOD FOR PRODUCING MARTENSITIC STAINLESS STEEL SEAMLESS PIPE

#16
20240417830
2024-12-19

NON-ORIENTED SILICON STEEL FOR DRIVING MOTORS OF NEW ENERGY VEHICLES AND PRODUCTION METHOD THEREOF

#17
20240410499
2024-12-12

HIGH-STRENGTH STAINLESS SEAMLESS STEEL PIPE FOR OIL WELLS AND METHOD FOR PRODUCING THE SAME

#18
20240390967
2024-11-28

STEEL PIPE FOR LINE PIPE WITH EXCELLENT LOW TEMPERATURE TOUGHNESS OF WELDED ZONE AND METHOD FOR MANUFACTURING THE SAME

#19
20240352564
2024-10-24

CORROSION-RESISTANT AND HIGH TOUGHNESS OIL CASING AND METHOD FOR MANUFACTURING SAME

#20
20240309480
2024-09-19

DUPLEX STAINLESS STEEL PIPE AND METHOD FOR MANUFACTURING SAME

#21
20240261119
2024-08-08

Lumen Stent and Preform thereof, and Methods for Preparing the Lumen Stent and Preform thereof

#22
20240254609
2024-08-01

AUSTENITIC STAINLESS STEEL AND TUBE

#23
20240247351
2024-07-25

METHOD OF FORMING AND HEAT TREATING COILED TUBING

#24
20240229979
2024-07-11

HIGH-STRENGTH AND HIGH-TOUGHNESS BAINITE GEOLOGICAL DRILLING PIPE AND MANUFACTURING METHOD THEREFOR

#25
20240229200
2024-07-11

ELECTRIC RESISTANCE WELDED STEEL PIPE AND METHOD FOR PRODUCING THE SAME

#26
20240218492
2024-07-04

ELECTRIC RESISTANCE WELDED STEEL PIPE FOR MECHANICAL STRUCTURAL COMPONENTS, AND METHOD FOR PRODUCING SAME

#27
20240200161
2024-06-20

HEAT-RESISTANT STEEL FOR STEEL PIPES AND CASTINGS

#28
20240191331
2024-06-13

STAINLESS STEEL PIPE AND METHOD FOR MANUFACTURING THE SAME

#29
20240150862
2024-05-09

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

#30
20240141466
2024-05-02

DUPLEX STAINLESS STEEL AND FORMED OBJECT THEREOF

#31
20240141451
2024-05-02

HOT-STRETCH-REDUCED ELECTRIC RESISTANCE WELDED PIPE

#32
20240133490
2024-04-25

HIGH-STRENGTH AND HIGH-TOUGHNESS BAINITE GEOLOGICAL DRILLING PIPE AND MANUFACTURING METHOD THEREFOR

#33
20240124949
2024-04-18

HIGH-STRENGTH STAINLESS STEEL SEAMLESS PIPE FOR OIL COUNTRY TUBULAR GOODS AND METHOD FOR MANUFACTURING SAME

#34
20240093809
2024-03-21

High pressure tube and method of manufacturing the same

#35
20240093324
2024-03-21

STEEL PIPE FOR PRESSURE PIPING AND STARTING MATERIAL FOR STEEL PIPE

#36
20240093323
2024-03-21

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

#37
20240068064
2024-02-29

400 MPa CORROSION-RESISTANT STEEL BAR AND PRODUCTION METHOD THEREOF

#38
20240052455
2024-02-15

WIRE ROD FOR ULTRAHIGH-STRENGTH SPRINGS, STEEL WIRE, AND MANUFACTURING METHOD THEREFOR

#39
20240035110
2024-02-01

Method for manufacturing a low-carbon nitrogen-containing austenitic stainless steel bar

#40
20240026999
2024-01-25

ELECTRIC RESISTANCE WELDED STEEL PIPE AND METHOD FOR MANUFACTURING THE SAME

#41
20240002967
2024-01-04

Thermal Processing Method for Niobium-Containing High-Alloy Austenitic Heat-Resistant Stainless Steel Bar

#42
20230416889
2023-12-28

Austenitic Stainless Steel

#43
20230392241
2023-12-07

MARTENSITIC STAINLESS STEEL MATERIAL

#44
20230392224
2023-12-07

Linepipe Steel With Enhanced Sulfide Stress Cracking Resistance

#45
20230366071
2023-11-16

MARTENSITIC STAINLESS STEEL MATERIAL

#46
20230357876
2023-11-09

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

#47
20230340632
2023-10-26

STAINLESS STEEL SEAMLESS PIPE AND METHOD FOR MANUFACTURING SAME

#48
20230304118
2023-09-28

Method for Preparing Stainless Steel Seamless Tube with Ultra-High Cleanliness for Integrated Circuit and IC Industry Preparation Device, and Stainless Steel Seamless Tube

#49
20230273394
2023-08-31

Lens Alignment System and Method

#50
20230212724
2023-07-06

Duplex stainless steel tube and welded joint

#51
20230212723
2023-07-06

DUPLEX STAINLESS STEEL SEAMLESS PIPE

#52
20230193414
2023-06-22

STEEL AND STEEL COMPONENT

#53
20230183831
2023-06-15

Multi-thickness welded vehicle structure

#54
20230183829
2023-06-15

ALLOY PIPE AND METHOD FOR PRODUCING SAME

#55
20230182187
2023-06-15

Tube and a method of manufacturing a tube

#56
20230167520
2023-06-01

S32750 Austenitic Ferrite Super Duplex Stainless Steel Seamless Pipe for Deep Sea Manifold and Method for Preparing Same

#57
20230166010
2023-06-01

HIGH-NITROGEN NICKEL-FREE AUSTENITIC STAINLESS STEEL SEAMLESS THIN-WALLED TUBE, A HIGH-SAFETY NICKEL-FREE METAL DRUG-ELUTING VASCULAR STENT MANUFACTURED THEREFROM, AND MANUFACTURING METHODS THEREFOR

#58
20230137295
2023-05-04

STAINLESS STEEL SEAMLESS PIPE AND METHOD FOR MANUFACTURING STAINLESS STEEL SEAMLESS PIPE

#59
20230134881
2023-05-04

SLIDING ELEMENT, IN PARTICULAR PISTON RING, AND METHOD FOR PRODUCING SAME

#60
20230128437
2023-04-27

HIGH-STRENGTH STAINLESS STEEL SEAMLESS PIPE FOR OIL COUNTRY TUBULAR GOODS AND METHOD FOR MANUFACTURING SAME

#61
20230114537
2023-04-13

MARTENSITIC STAINLESS STEEL SEAMLESS PIPE

#62
20230097339
2023-03-30

STAINLESS STEEL PIPE AND METHOD FOR MANUFACTURING SAME

#63
20230093813
2023-03-30

Heat treatment method for tubular shaft for drive shaft having ball spline structure and tubular shaft manufactured thereby

#64
20230090789
2023-03-23

STAINLESS STEEL SEAMLESS PIPE AND METHOD FOR MANUFACTURING SAME

#65
20230055650
2023-02-23

High-strength seamless steel pipe and method for manufacturing same

#66
20230048685
2023-02-16

STAINLESS STEEL SEAMLESS PIPE AND METHOD FOR MANUFACTURING STAINLESS STEEL SEAMLESS PIPE

#67
20230023397
2023-01-26

High-strength seamless steel pipe and method for manufacturing same

#68
20220411890
2022-12-29

Seamless steel pipe having desirable sulfuric acid dew-point corrosion resistance, and method for manufacturing same

#69
20220396856
2022-12-15

Hot-rolled steel sheet for electric resistance welded steel pipe and method for manufacturing the same, electric resistance welded steel pipe and method for manufacturing the same, line pipe, and building structure

#70
20220373108
2022-11-24

ELECTRIC RESISTANCE WELDED STEEL PIPE, METHOD FOR PRODUCING THE SAME, LINE PIPE, AND BUILDING STRUCTURE

#71
20220349036
2022-11-03

Stainless steel seamless pipe and method for manufacturing same

#72
20220341012
2022-10-27

Hot-rolled steel sheet having excellent impact resistance, steel pipe, member, and manufacturing methods therefor

#73
20220339688
2022-10-27

Tube and a method of manufacturing a tube

#74
20220339012
2022-10-27

Lumen stent and preform thereof, and methods for preparing the lumen stent and preform thereof

#75
20220275468
2022-09-01

STEEL MATERIAL FOR A TORSIONALLY STRESSED COMPONENT, METHOD FOR PRODUCING A TORSIONALLY STRESSED COMPONENT FROM SAID STEEL MATERIAL, AND COMPONENT MADE THEREOF

#76
20220220574
2022-07-14

Steel material for line pipes, method for producing the same, line pipe, and method for producing the line pipe

#77
20220213570
2022-07-07

Cooling device for seamless steel pipes

#78
20220186348
2022-06-16

Electric-resistance-welded steel pipe or tube for hollow stabilizer and method of manufacturing same

#79
20220177990
2022-06-09

Stainless steel seamless pipe

#80
20220136469
2022-05-05

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

#81
20220127707
2022-04-28

DUPLEX STAINLESS SEAMLESS STEEL PIPE AND METHOD FOR PRODUCING DUPLEX STAINLESS SEAMLESS STEEL PIPE

#82
20220112585
2022-04-14

DUPLEX STAINLESS STEEL AND FORMED OBJECT THEREOF

#83
20220112572
2022-04-14

STEEL PIPE FOR FUEL INJECTION PIPE, AND FUEL INJECTION PIPE USING SAME

#84
20220106659
2022-04-07

DUPLEX STAINLESS STEEL, SEAMLESS STEEL PIPE OR TUBE, AND A METHOD OF MANUFACTURING THE DUPLEX STAINLESS STEEL

#85
20220082781
2022-03-17

Lens alignment system and method

#86
20220074031
2022-03-10

Steel sheet for cans and method of producing same

#87
20220049333
2022-02-17

Austenitic stainless steel having excellent pipe-expandability and age cracking resistance

#88
20220042148
2022-02-10

Steel material suitable for use in sour environment

#89
20220033943
2022-02-03

Martensitic stainless seamless steel pipe

#90
20220033939
2022-02-03

Ferritic stainless steel and ferritic stainless steel pipe with improved mechanical properties of welding portion

#91
20210405318
2021-12-30

Lens alignment system and method

#92
20210324979
2021-10-21

Electric resistance welded steel pipe for torsion beam

#93
20210317556
2021-10-14

Martensitic stainless seamless steel pipe

#94
20210310105
2021-10-07

TI- AND NB-ADDED FERRITIC STAINLESS STEEL EXCELLENT IN LOW-TEMPERATURE TOUGHNESS OF WELDS

#95
20210292879
2021-09-23

Superalloy seamless tube and preparation method thereof

#96
20210292864
2021-09-23

Austenitic Alloy Pipe and Method for Producing Same

#97
20210277507
2021-09-09

Electric resistance welded steel tubes for high-strength thin hollow stabilizers, and methods for manufacturing the same

#98
20210269902
2021-09-02

Steel material suitable for use in sour environment

#99
20210268862
2021-09-02

Electric-resistance-welded steel pipe for producing hollow stabilizer, hollow stabilizer, and method for producing same

#100
20210262051
2021-08-26

Steel material and method for producing steel material

#101
20210207232
2021-07-08

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

#102
20210189534
2021-06-24

Ferritic alloy and method of manufacturing nuclear fuel cladding tube using the same

#103
20210180149
2021-06-17

Steel pipe and method for producing steel pipe

#104
20210140726
2021-05-13

Air conditioner

#105
20210071275
2021-03-11

Low-alloy high-strength seamless steel pipe for oil country tubular goods

#106
20210062313
2021-03-04

HOT-ROLLED STEEL SHEET HAVING EXCELLENT IMPACT RESISTANCE, STEEL PIPE, MEMBER, AND MANUFACTURING METHODS THEREFOR

#107
20210054485
2021-02-25

Hot-rolled steel sheet with excellent low-temperature toughness, steel pipe, and manufacturing method therefor

#108
20210054473
2021-02-25

STEEL COMPOSITION IN ACCORDANCE WITH API 5L PSL-2 SPECIFICATION FOR X-65 GRADE HAVING ENHANCED HYDROGEN INDUCED CRACKING (HIC) RESISTANCE, AND METHOD OF MANUFACTURING THE STEEL THEREOF

#109
20210032732
2021-02-04

Steel material for line pipes, method for producing the same, and method for producing line pipe

#110
20210032730
2021-02-04

SULPHIDE STRESS CRACKING RESISTANT STEEL, TUBULAR PRODUCT MADE FROM SAID STEEL, PROCESS FOR MANUFACTURING A TUBULAR PRODUCT AND USE THEREOF

#111
20210032715
2021-02-04

High tensile and high toughness steels

#112
20210025021
2021-01-28

Seamless steel pipe heat-treatment-finishing-treatment continuous facility

#113
20210025020
2021-01-28

Low temperature resistant oil casing having high strength and high toughness, and manufacturing method thereof

#114
20210002750
2021-01-07

Duplex stainless steel

#115
20210001425
2021-01-07

Electric resistance welded steel pipe for producing hollow stabilizer, hollow stabilizer, and production methods for same

#116
20200407814
2020-12-31

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

#117
20200384514
2020-12-10

Production method of seamless steel pipe

#118
20200360978
2020-11-19

Method for straightening of a FeCrAl alloy tube

#119
20200325553
2020-10-15

Low-alloy high-strength seamless steel pipe for oil country tubular goods

#120
20200283866
2020-09-10

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

#121
20200255926
2020-08-13

Steel alloy with high energy absorption capacity and tubular steel product

#122
20200255917
2020-08-13

Steel for coiled tubing with low yield ratio and ultra-high strength and preparation method thereof

#123
20200240571
2020-07-30

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

#124
20200199720
2020-06-25

A TUBE MADE OF AN AUSTENITIC STAINLESS STEEL AND A METHOD FOR MANUFACTURING THEREOF

#125
20200190618
2020-06-18

STEEL MEMBER, HOT-ROLLED STEEL SHEET FOR STEEL MEMBER, AND PRODUCTION METHOD THEREFOR

#126
20200165693
2020-05-28

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

#127
20200157646
2020-05-21

High-strength seamless stainless steel pipe for oil country tubular goods and method of manufacturing high-strength seamless stainless steel pipe

#128
20200132316
2020-04-30

Air conditioner

#129
20200123629
2020-04-23

METHOD OF PRODUCING TUBE OF DUPLEX STAINLESS STEEL

#130
20200109460
2020-04-09

Apparatus line for manufacturing seamless steel pipe and tube and method of manufacturing duplex seamless stainless steel pipe

#131
20200102633
2020-04-02

Method of forming and heat treating coiled tubing

#132
20200095658
2020-03-26

High strength micro alloyed steel seamless pipe for sour service and high toughness applications

#133
20200040417
2020-02-06

QUENCHING PROCESSING APPARATUS

#134
20200009629
2020-01-09

Method of manufacturing a coiled tubing string

#135
20190390296
2019-12-26

Electric resistance welded steel tube for coiled tubing and method for manufacturing the same

#136
20190376167
2019-12-12

Steel Material and Method for Producing Steel Material

#137
20190376157
2019-12-12

High-strength stainless steel seamless pipe for oil country tubular goods, and method for producing same

#138
20190368001
2019-12-05

High strength seamless stainless steel pipe and method for producing same

#139
20190360064
2019-11-28

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

#140
20190360063
2019-11-28

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

#141
20190352752
2019-11-21

Duplex stainless steel and method for producing same

#142
20190323099
2019-10-24

Micro alloyed steel and method for producing said steel

#143
20190316234
2019-10-17

High-strength and high-toughness perforating gun tube and manufacturing method therefor

#144
20190292639
2019-09-26

DUPLEX STAINLESS STEEL MATERIAL AND DUPLEX STAINLESS STEEL TUBE

#145
20190292637
2019-09-26

OIL WELL PIPE FOR EXPANDABLE TUBULAR

#146
20190292619
2019-09-26

Duplex stainless steel and method of manufacturing duplex stainless steel

#147
20190292618
2019-09-26

High-strength seamless stainless steel pipe for oil country tubular goods, and method for producing the same

#148
20190264297
2019-08-29

Medium-manganese steel product for low-temperature use and method for the production thereof

#149
20190241989
2019-08-08

MARTENSITIC STAINLESS STEEL SEAMLESS PIPE FOR OIL COUNTRY TUBULAR GOODS, AND METHOD FOR PRODUCING SAME

#150
20190226041
2019-07-25

Method for the in-line manufacturing of steel tube

#151
20190226039
2019-07-25

High-strength seamless steel pipe for oil country tubular goods, and method for producing the same

#152
20190217424
2019-07-18

Electric resistance welded steel pipe for torsion beam

#153
20190211430
2019-07-11

Hot-rolled steel sheet for heavy-wall, high-strength line pipe, welded steel pipe for heavy-wall, high-strength line pipe, and method for producing the welded steel pipe

#154
20190211417
2019-07-11

Method for producing a re-shaped component from a manganese-containing flat steel product and such a component

#155
20190211416
2019-07-11

Dual-phase stainless steel, and method of production thereof

#156
20190211414
2019-07-11

Steel pipe or tube for pressure vessels, method of producing steel pipe or tube for pressure vessels, and composite pressure vessel liner

#157
20190203313
2019-07-04

HIGH CHROMIUM MARTENSITIC HEAT-RESISTANT STEEL WITH COMBINED HIGH CREEP RUPTURE STRENGTH AND OXIDATION RESISTANCE

#158
20190203312
2019-07-04

Method for producing a shaped component from a medium-manganese flat steel product and such a component

#159
20190193131
2019-06-27

Method for forming a hollow of a ferritic FeCrAl alloy into a tube

#160
20190177813
2019-06-13

Seamless steel pipe and method for producing same

#161
20190177812
2019-06-13

Method and device for forming and hardening steel materials

#162
20190161819
2019-05-30

METHOD FOR PRODUCING A COMPONENT, COMPONENT AND PRESS FOR PRODUCING A COMPONENT

#163
20190144981
2019-05-16

Austenitic stainless steel and production method therefor

#164
20190136337
2019-05-09

High strength stainless steel seamless pipe for oil country tubular goods

#165
20190127832
2019-05-02

Austenitic Stainless Steel

#166
20190112694
2019-04-18

Austenitic Stainless Steel Material

#167
20190100821
2019-04-04

High-strength seamless stainless steel pipe and method of manufacturing high-strength seamless stainless steel pipe

#168
20190070650
2019-03-07

Tube and a method of manufacturing a tube

#169
20190063641
2019-02-28

Steel material and oil-well steel pipe

#170
20190055617
2019-02-21

Low alloy high strength thick-walled seamless steel pipe for oil country tubular goods

#171
20190048446
2019-02-14

Steel material and oil-well steel pipe

#172
20190048444
2019-02-14

LOW ALLOY HIGH STRENGTH SEAMLESS STEEL PIPE FOR OIL COUNTRY TUBULAR GOODS

#173
20190048443
2019-02-14

Low alloy high strength seamless steel pipe for oil country tubular goods

#174
20190040488
2019-02-07

Steel plate for high-strength and high-toughness steel pipes and method for producing steel plate

#175
20190040484
2019-02-07

METHOD FOR FACILITATING THERMOMECHANICAL FORMING PROCESS OF AUSTENITE CONTAINING GRADES TO PRODUCE TAILORED STRENGTH STRUCTURAL COMPONENTS

#176
20190040480
2019-02-07

SEAMLESS STEEL PIPE AND METHOD FOR PRODUCING SAME

#177
20190024201
2019-01-24

High-strength seamless steel pipe for oil country tubular goods, and production method for high-strength seamless steel pipe for oil country tubular goods

#178
20190017134
2019-01-17

Process of producing an austenitic stainless steel tube

#179
20190010569
2019-01-10

Process of producing a duplex stainless steel tube

#180
20180371591
2018-12-27

AUSTENITIC STAINLESS STEEL PIPE EXHIBITING EXCELLENT WRINKLE RESISTANCE

#181
20180355451
2018-12-13

SEAMLESS STEEL PIPE AND METHOD OF MANUFACTURING THE SAME

#182
20180327881
2018-11-15

High-strength seamless steel pipe for oil country tubular goods and method of producing the same

#183
20180320243
2018-11-08

Method of manufacturing stainless pipe for oil wells and stainless steel pipe for oil wells

#184
20180312937
2018-11-01

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

#185
20180305780
2018-10-25

Electric resistance welded steel pipe for high-strength hollow stabilizer, and method for manufacturing electric resistance welded steel pipe for high-strength hollow stabilizer

#186
20180298459
2018-10-18

ONLINE-CONTROL COOLING PROCESS FOR SEAMLESS STEEL TUBE FOR EFFECTIVELY REFINING GRAINS AND THE METHOD FOR MANUFACTURING THEREOF

#187
20180291475
2018-10-11

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

#188
20180283584
2018-10-04

Ductile stainless steel pipe and heat pump system comprising the same

#189
20180282833
2018-10-04

Method for manufacturing bainite high-strength seamless steel tube, and bainite high-strength seamless steel tube

#190
20180274054
2018-09-27

Seamless steel tube with high strength and toughness and manufacturing method therefor

#191
20180265960
2018-09-20

POST-BORIDING PROCESSES FOR TREATING PIPE AND RECOVERING BORONIZING POWDER

#192
20180265952
2018-09-20

HOLLOW SEAMLESS STEEL PIPE FOR SPRING

#193
20180265941
2018-09-20

Process for on-line quenching of seamless steel tube using residual heat and manufacturing method

#194
20180244125
2018-08-30

TUBULAR SPRING FOR MOTOR VEHICLES, AND A METHOD FOR PRODUCING A TUBULAR SPRING

#195
20180237879
2018-08-23

STAINLESS STEEL PIPE AND METHOD OF MANUFACTURING THE SAME

#196
20180230567
2018-08-16

STEEL MATERIAL FOR COMPOSITE PRESSURE VESSEL LINER, STEEL PIPE OR TUBE FOR COMPOSITE PRESSURE VESSEL LINER, AND METHOD OF MANUFACTURING STEEL PIPE OR TUBE FOR COMPOSITE PRESSURE VESSEL LINER

#197
20180223403
2018-08-09

HIGH-ALLOY STEEL AND METHOD FOR PRODUCING PIPES FROM THIS STEEL BY MEANS OF INTERNAL HIGH PRESSURE FORMING

#198
20180223388
2018-08-09

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

#199
20180223384
2018-08-09

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

#200
20180209022
2018-07-26

Duplex stainless steel and formed object thereof

#201
20180209005
2018-07-26

Process for producing a high-grade steel tube and high-grade steel tube

#202
20180200770
2018-07-19

Method of manufacturing a coiled tubing string

#203
20180187279
2018-07-05

Corrosion resistant steel, method for producing said steel and its use thereof

#204
20180187278
2018-07-05

Steel pipe for line pipe and method of manufacturing the same

#205
20180187277
2018-07-05

High-toughness seamless steel tube for automobile safety airbag and manufacturing method therefor

#206
20180171426
2018-06-21

Steel pipe for fuel injection pipe and method for producing the same

#207
20180171424
2018-06-21

DEFORMATION-HARDENED COMPONENT MADE OF GALVANIZED STEEL, PRODUCTION METHOD THEREFOR AND METHOD FOR PRODUCING A STEEL STRIP SUITABLE FOR THE DEFORMATION-HARDENING OF COMPONENTS

#208
20180135154
2018-05-17

LOW ALLOY STEEL FOR OIL COUNTRY TUBULAR GOODS HAVING EXCELLENT SULFIDE STRESS CRACKING RESISTANCE AND MANUFACTURING METHOD THEREFOR

#209
20180106557
2018-04-19

Stainless steel and pipe made thereof

#210
20180105893
2018-04-19

High strength electric resistance welded steel pipe and method for producing high strength electric resistance welded steel pipe

#211
20180100214
2018-04-12

STEEL FOR HOT FORMING

#212
20180073097
2018-03-15

Steel for pipes having high fatigue resistance, method of manufacturing the same, and welded steel pipe using the same

#213
20180073095
2018-03-15

HIGH-STRENGTH STEEL, METHOD FOR MANUFACTURING HIGH-STRENGTH STEEL, STEEL PIPE AND METHOD FOR MANUFACTURING STEEL PIPE (AS AMENDED)

#214
20180073094
2018-03-15

X80 pipeline steel with good strain-aging performance, pipeline tube and method for producing same

#215
20180066332
2018-03-08

High-strength steel, method for manufacturing high-strength steel, steel pipe, and method for manufacturing steel pipe

#216
20180066331
2018-03-08

METHOD OF PRODUCING A TUBE OF A DUPLEX STAINLESS STEEL

#217
20180057904
2018-03-01

Hollow forging process for main shaft of large wind turbine generator

#218
20180051353
2018-02-22

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

#219
20180044748
2018-02-15

Steel material for composite pressure vessel liner and steel pipe or tube for composite pressure vessel liner

#220
20180023163
2018-01-25

High-strength welded steel pipe for airbag inflator and method for manufacturing the same

#221
20180023158
2018-01-25

High-strength heavy-walled stainless steel seamless tube or pipe and method of manufacturing the same

#222
20180002775
2018-01-04

Heat treatable steel, product formed thereof having ultra high strength and excellent durability, and method for manufacturing same

#223
20170369963
2017-12-28

Seamless stainless steel pipe for oil country tubular goods and method of manufacturing the same

#224
20170369962
2017-12-28

High strength thick-walled electric-resistance-welded steel pipe for deep-well conductor casing, method for manufacturing the same, and high strength thick-walled conductor casing for deep wells

#225
20170362674
2017-12-21

Low-alloy steel for oil well pipe and method of manufacturing low-alloy steel oil well pipe

#226
20170349964
2017-12-07

High-strength seamless steel pipe for oil country tubular goods and method of producing the same

#227
20170349963
2017-12-07

High-strength seamless steel pipe for oil country tubular goods and method of producing the same

#228
20170335422
2017-11-23

Apparatus line for manufacturing seamless steel pipe and tube and method of manufacturing duplex seamless stainless steel pipe

#229
20170335421
2017-11-23

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

#230
20170312101
2017-11-02

Lumen stent and preform thereof, and methods for preparing lumen stent and preform thereof

#231
20170306462
2017-10-26

High-strength steel material for oil well and oil country tubular goods

#232
20170283918
2017-10-05

High-strength seamless steel pipe for oil country tubular goods and method of producing the same

#233
20170283897
2017-10-05

METHOD AND SYSTEM FOR THE PRODUCTION OF A SEAMLESS HOT-ROLLED TUBE AS WELL AS A ROLLED CENTRIFUGALLY CAST TUBE AND USE OF A HOLLOW BLOCK PRODUCED BY MEANS OF CENTRIFUGAL CASTING

#234
20170283896
2017-10-05

Low-temperature high-strength-and-ductility high manganese steel, and high manganese steel plate and high manganese steel tube manufacturing process

#235
20170282236
2017-10-05

Hollow metal screw and method of making

#236
20170275715
2017-09-28

High-strength seamless steel pipe for oil country tubular goods and method of producing the same

#237
20170268083
2017-09-21

High-strength steel for steel forgings, and steel forging

#238
20170130304
2017-05-11

Alloy with High Core Hardness Suitable for Rapid Nitriding

#239
20170130289
2017-05-11

High elastic modulus shafts and method of manufacture

#240
20170129556
2017-05-11

Nitrided track pin for track chain assembly of machine

#241
20170114426
2017-04-27

Components made of a steel alloy and method for producing high-strength components

#242
20170096722
2017-04-06

High-strength seamless stainless steel pipe for oil country tubular goods and method for manufacturing the same

#243
20170081746
2017-03-23

Low-alloy steel pipe for an oil well

#244
20170067129
2017-03-09

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

#245
20170029912
2017-02-02

MARTENSITIC-FERRITIC STAINLESS STEEL, MANUFACTURED PRODUCT AND PROCESS USING THE S

#246
20170022590
2017-01-26

Steel material for highly deformable line pipes having superior strain aging resistance and superior HIC resistance, method for manufacturing same, and welded steel pipe

#247
20170022581
2017-01-26

Seamless steel tube for fuel injection

#248
20170009316
2017-01-12

High-strength hot-rolled steel sheet and method for manufacturing the same

#249
20170009313
2017-01-12

Method for the production of a seamless, multilayered tubular product, and round or polygonal block for use in this method

#250
20170002437
2017-01-05

Titanium-free alloy

#251
20160376677
2016-12-29

Method for producing a tempered seamlessly hot-fabricated steel pipe

#252
20160369759
2016-12-22

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

#253
20160369381
2016-12-22

Seamless steel pipe for line pipe used in sour environments

#254
20160362759
2016-12-15

METHOD FOR PRODUCING HOT-ROLLED SEAMLESS PIPES FROM TRANSFORMABLE STEEL, IN PARTICULAR FOR PIPELINES FOR DEEP-WATER APPLICATIONS, AND CORRESPONDING PIPES

#255
20160355901
2016-12-08

High-strength stainless steel pipe

#256
20160348463
2016-12-01

Annular barrier having a downhole expandable tubular

#257
20160348206
2016-12-01

METHOD FOR RESTORING THE STRUCTURE OF A STEEL COMPONENT AFTER HEATING AND STEEL COMPONENT OBTAINED BY THE METHOD

#258
20160333446
2016-11-17

High alloy for oil well

#259
20160326617
2016-11-10

Martensitic Cr-containing steel and oil country tubular goods

#260
20160281197
2016-09-29

Advanced Fe-5Cr-X Alloy

#261
20160281188
2016-09-29

HEAT TREATED COILED TUBING

#262
20160265076
2016-09-15

Equipment line for manufacturing seamless steel tube or pipe and method of manufacturing high-strength stainless steel seamless tube or pipe for oil wells using the equipment line

#263
20160258035
2016-09-08

Method for producing a hot-formed and quench-hardened motor vehicle component formed by internal high-pressure forming

#264
20160230241
2016-08-11

Electric resistance welded steel pipe for oil well

#265
20160215359
2016-07-28

High-strength stainless steel pipe

#266
20160208841
2016-07-21

Hollow metal screw and method of making

#267
20160201710
2016-07-14

Hollow metal screw and method of making

#268
20160193641
2016-07-07

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

#269
20160161028
2016-06-09

Seamless steel pipe for line pipe

#270
20160160307
2016-06-09

Low alloy oil well steel pipe and method for manufacturing same

#271
20160153063
2016-06-02

Heavy wall electric resistance welded steel pipe for line pipe and method for manufacturing the same

#272
20160130675
2016-05-12

METHOD FOR PRODUCING A COMPONENT BY HOT FORMING A PRE-PRODUCT MADE OF STEEL

#273
20160060738
2016-03-03

STEEL STRUCTURE FOR HYDROGEN GAS, MEHTOD FOR PRODUCING HYDROGEN STORAGE TANK, AND METHOD FOR PRODUCING HYDROGEN LINE PIPE (AS AMENDED)

#274
20160047019
2016-02-18

Method for manufacturing superior 13Cr thickened drillrod

#275
20160033059
2016-02-04

FLOWFORMING CORROSION RESISTANT ALLOY TUBES

#276
20160024625
2016-01-28

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

#277
20160003281
2016-01-07

Hollow metal screw and method of making

#278
20150361518
2015-12-17

500 MPA grade longitudinally-welded steel pipe with low yield ratio and manufacturing method therefor

#279
20150354022
2015-12-10

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

#280
20150315685
2015-11-05

Seamless steel pipe and method for producing same

#281
20150315684
2015-11-05

High-strength stainless steel seamless tube or pipe for oil country tubular goods, and method of manufacturing the same

#282
20150307972
2015-10-29

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

#283
20150275339
2015-10-01

HIGH-CARBON STEEL TUBE HAVING SUPERIOR COLD WORKABILITY, MACHINABILITY, AND HARDENABILITY AND METHOD FOR MANUFACTURING THE SAME

#284
20150247227
2015-09-03

Method for manufacturing heavy wall steel pipe

#285
20150247226
2015-09-03

Method for producing a low alloy steel for oil country tubular goods having excellent sulfide stress cracking resistance

#286
20150233074
2015-08-20

NODULAR CAST IRON FOUNDATION PILE PIPE AND A METHOD FOR PREPARING SAME

#287
20150226014
2015-08-13

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

#288
20150203933
2015-07-23

High-strength electric-resistance-welded steel pipe of excellent long-term softening resistance in intermediate temperature ranges

#289
20150194227
2015-07-09

Austenitic alloy tube

#290
20150176727
2015-06-25

THICK, HIGH-STRENGTH, SOUR-RESISTANT LINE PIPE AND METHOD FOR PRODUCING SAME

#291
20150176101
2015-06-25

HOLLOW STABILIZER, AND STEEL PIPE FOR HOLLOW STABILIZERS AND METHOD OF PRODUCING THE SAME

#292
20150152982
2015-06-04

THICK-WALLED HIGH-STRENGTH SOUR-RESISTANT LINE PIPE AND METHOD FOR PRODUCING SAME

#293
20150152530
2015-06-04

Duplex stainless steel

#294
20150107724
2015-04-23

Dual phase stainless steel pipe and manufacturing method thereof

#295
20150101711
2015-04-16

HIGH-STRENGTH SEAMLESS STAINLESS STEEL TUBE FOR OIL COUNTRY TUBULAR GOODS AND METHOD OF MANUFACTURING THE SAME

#296
20150090370
2015-04-02

High strength steel plate having low yield ratio excellent in terms of strain ageing resistance, method of manufacturing the same and high strength welded steel pipe made of the same

#297
20150083282
2015-03-26

Seamless steel pipe and method for producing the same

#298
20150083266
2015-03-26

High-strength thick-walled electric resistance welded steel pipe having excellent low-temperature toughness and method of manufacturing the same

#299
20150068638
2015-03-12

Low-yield ratio high-strength electric resistance welded steel pipe, steel strip for electric resistance welded steel pipes, and methods of manufacturing them

#300
20150059912
2015-03-05

High strength steel plate having low yield ratio excellent in terms of strain ageing resistance, method of manufacturing the same and high strength welded steel pipe made of the same