ClassID:

119079

C21D9/085 - CPC Classification

Classification description:

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

Recent Application in this class:
#1
20260145278
2026-05-28

SULFUR-RESISTANT AND CORROSION-RESISTANT LOW-CARBON ALLOY-BASED COILED TUBING AND PREPARATION METHOD THEREOF

#2
20260117353
2026-04-30

STEEL COMPOSITION, MANUFACTURING METHOD, STEEL ARTICLE AND USES HEREOF

#3
20260110065
2026-04-23

STEEL MATERIAL FOR HIGH-STRENGTH LINE PIPE WITH HIGH FRACTURE TOUGHNESS IN HYDROGEN AND METHOD FOR PRODUCING THE SAME, AND STEEL PIPE FOR HIGH-STRENGTH LINE PIPE AND METHOD FOR PRODUCING THE SAME

#4
20260098329
2026-04-09

STEEL MATERIAL WITH GOOD FATIGUE PROPERTY IN HYDROGEN AND METHOD FOR PRODUCING THE SAME, AND STEEL PIPE AND METHOD FOR PRODUCING THE SAME

#5
20260098326
2026-04-09

LOW-ALLOY STEEL, PLATE AND WELDED PIPE RESISTANT TO CARBON DIOXIDE AND MICROORGANISM CORROSION, AND MANUFACTURING METHOD THEREFOR

#6
20260009098
2026-01-08

Steel Composition for Expandable Tubular Articles, Expandable Tubular Article Having This Steel Composition, Manufacturing Method Thereof and Use Thereof

#7
20260001117
2026-01-01

FORMING SYSTEM, FORMING DEVICE, AND FORMING METHOD

#8
20250382689
2025-12-18

STAINLESS STEEL SEAMLESS PIPE AND PRODUCTION METHOD THEREFOR

#9
20250327156
2025-10-23

HIGH-STRENGTH PETROLEUM PIPE CASING AND MANUFACTURING METHOD THEREFOR

#10
20250320592
2025-10-16

STAINLESS STEEL SEAMLESS PIPE AND PRODUCTION METHOD THEREFOR

#11
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

#12
20250215539
2025-07-03

STEEL TUBE, VEHICLE COMPONENT, METHOD FOR PRODUCING STEEL TUBE, AND METHOD FOR PRODUCING VEHICLE COMPONENT

#13
20250197981
2025-06-19

HOT ROLLED STEEL SHEET HAVING EXCELLENT COLD BENDABILITY AFTER HEATING AND QUENCHING-TEMPERING HEAT TREATMENT, STEEL PIPE, MEMBER AND MANUFACTURING METHODS THEREFOR

#14
20250101554
2025-03-27

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

#15
20250012382
2025-01-09

STEEL PIPE FOR OIL CYLINDER AND MANUFACTURING METHOD THEREFOR

#16
20250003042
2025-01-02

HIGH-STRENGTH SEAMLESS STAINLESS STEEL PIPE FOR OIL WELLS

#17
20240417835
2024-12-19

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

#18
20240410499
2024-12-12

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

#19
20240390967
2024-11-28

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

#20
20240352564
2024-10-24

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

#21
20240263264
2024-08-08

CONTINUOUS HEATING DEVICE AND CONTINUOUS HEATING METHOD

#22
20240247351
2024-07-25

METHOD OF FORMING AND HEAT TREATING COILED TUBING

#23
20240247350
2024-07-25

SEAMLESS STEEL TUBE RESISTANT TO CARBON DIOXIDE CORROSION AND MANUFACTURING METHOD THEREFOR

#24
20240229979
2024-07-11

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

#25
20240218492
2024-07-04

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

#26
20240209467
2024-06-27

ULTRA-HIGH-STRENGTH HOT-ROLLED STEEL SHEET, STEEL PIPE, MEMBER, AND MANUFACTURING METHODS THEREFOR

#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
20240133490
2024-04-25

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

#30
20240124949
2024-04-18

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

#31
20240026999
2024-01-25

ELECTRIC RESISTANCE WELDED STEEL PIPE AND METHOD FOR MANUFACTURING THE SAME

#32
20230392241
2023-12-07

MARTENSITIC STAINLESS STEEL MATERIAL

#33
20230392224
2023-12-07

Linepipe Steel With Enhanced Sulfide Stress Cracking Resistance

#34
20230366072
2023-11-16

NON-MAGNETIC AUSTENITIC STAINLESS STEEL MATERIAL AND PRODUCTION METHOD THEREFOR

#35
20230366071
2023-11-16

MARTENSITIC STAINLESS STEEL MATERIAL

#36
20230357876
2023-11-09

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

#37
20230193414
2023-06-22

STEEL AND STEEL COMPONENT

#38
20230183831
2023-06-15

Multi-thickness welded vehicle structure

#39
20230167522
2023-06-01

High Strength, High-Temperature Corrosion Resistant Martensitic Stainless Steel and Manufacturing Method Therefor

#40
20230109773
2023-04-13

MARTENSITIC STAINLESS STEEL MATERIAL AND METHOD FOR PRODUCING MARTENSITIC STAINLESS STEEL MATERIAL

#41
20230107887
2023-04-06

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

#42
20230055650
2023-02-23

High-strength seamless steel pipe and method for manufacturing same

#43
20230048685
2023-02-16

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

#44
20220411890
2022-12-29

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

#45
20220373108
2022-11-24

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

#46
20220364671
2022-11-17

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

#47
20220349036
2022-11-03

Stainless steel seamless pipe and method for manufacturing same

#48
20220220574
2022-07-14

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

#49
20220213570
2022-07-07

Cooling device for seamless steel pipes

#50
20220195551
2022-06-23

High strength steel tube and method of manufacturing a high strength steel tube

#51
20220177990
2022-06-09

Stainless steel seamless pipe

#52
20220112572
2022-04-14

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

#53
20220074009
2022-03-10

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

#54
20220033943
2022-02-03

Martensitic stainless seamless steel pipe

#55
20220016684
2022-01-20

Method for manufacturing torsion beam

#56
20210371961
2021-12-02

Steel material suitable for use in sour environment

#57
20210332456
2021-10-28

APPARATUS FOR COOLING LONG PRODUCTS AND METHOD OF COOLING A LONG PRODUCT USING THE SAME

#58
20210317553
2021-10-14

Seamless steel pipe suitable for use in sour environment

#59
20210310091
2021-10-07

Electric resistance welded steel pipe or tube

#60
20210277507
2021-09-09

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

#61
20210269904
2021-09-02

Seamless steel pipe and method for producing the same

#62
20210262051
2021-08-26

Steel material and method for producing steel material

#63
20210207232
2021-07-08

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

#64
20210189516
2021-06-24

Tube product, hollow carrier of perforating gun and method of manufacturing the tube product

#65
20210180149
2021-06-17

Steel pipe and method for producing steel pipe

#66
20210087643
2021-03-25

Method for quenching steel pipe, equipment for quenching steel pipe, and method for manufacturing steel pipe

#67
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

#68
20210053099
2021-02-25

Method for manufacturing cold-forged, extruded aluminum alloy tube

#69
20210032715
2021-02-04

High tensile and high toughness steels

#70
20210025021
2021-01-28

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

#71
20210010098
2021-01-14

Hot-rolled steel sheet having excellent durability and method for manufacturing same

#72
20210001425
2021-01-07

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

#73
20200407814
2020-12-31

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

#74
20200384514
2020-12-10

Production method of seamless steel pipe

#75
20200362429
2020-11-19

Ultra-high-strength hot-rolled steel sheet, steel pipe, member, and manufacturing methods therefor

#76
20200347472
2020-11-05

Ductile Fuse for Special Concentrically Braced Frames and Related Methods

#77
20200299794
2020-09-24

Apparatus and methods for heating and quenching tubular members

#78
20200283865
2020-09-10

Method for preventing cracking along the surface at the inner hole of a hollow shaft during horizontal water quenching

#79
20200276625
2020-09-03

Piercing machine, and method for producing seamless metal pipe using the same

#80
20200270715
2020-08-27

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

#81
20200263266
2020-08-20

Method of manufacturing a tubular product and tubular product

#82
20200165693
2020-05-28

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

#83
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

#84
20200123629
2020-04-23

METHOD OF PRODUCING TUBE OF DUPLEX STAINLESS STEEL

#85
20200109460
2020-04-09

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

#86
20200109459
2020-04-09

VEHICLE UNDERBODY PART MATERIAL, METHOD FOR MANUFACTURING VEHICLE UNDERBODY PART MATERIAL, AND METHOD FOR MANUFACTURING VEHICLE UNDERBODY PART

#87
20200102633
2020-04-02

Method of forming and heat treating coiled tubing

#88
20200087766
2020-03-19

STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE IN DEW CONDENSATION ENVIRONMENT CONTAINING SULFIDE AND METHOD FOR PRODUCING SAME

#89
20200040436
2020-02-06

Steel material, oil-well steel pipe, and method for producing steel material

#90
20200040417
2020-02-06

QUENCHING PROCESSING APPARATUS

#91
20190376167
2019-12-12

Steel Material and Method for Producing Steel Material

#92
20190368001
2019-12-05

High strength seamless stainless steel pipe and method for producing same

#93
20190360064
2019-11-28

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

#94
20190360063
2019-11-28

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

#95
20190352752
2019-11-21

Duplex stainless steel and method for producing same

#96
20190352737
2019-11-21

Systems and methods for producing hot induction pipe bends with homogeneous metallurgical and mechanical properties

#97
20190323099
2019-10-24

Micro alloyed steel and method for producing said steel

#98
20190292637
2019-09-26

OIL WELL PIPE FOR EXPANDABLE TUBULAR

#99
20190276908
2019-09-12

Wellbore tubular air quenching

#100
20190241989
2019-08-08

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

#101
20190226039
2019-07-25

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

#102
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

#103
20190211417
2019-07-11

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

#104
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

#105
20190203313
2019-07-04

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

#106
20190186655
2019-06-20

Electric resistance welded clad steel pipe or tube and method of producing same

#107
20190177813
2019-06-13

Seamless steel pipe and method for producing same

#108
20190136337
2019-05-09

High strength stainless steel seamless pipe for oil country tubular goods

#109
20190100821
2019-04-04

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

#110
20190100820
2019-04-04

3-D printed cooling channels to produce PHS parts with tailored properties

#111
20190085424
2019-03-21

Heat treatment apparatus, heat treatment method for steel workpiece, and hot bending method for steel workpiece

#112
20190063641
2019-02-28

Steel material and oil-well steel pipe

#113
20190040480
2019-02-07

SEAMLESS STEEL PIPE AND METHOD FOR PRODUCING SAME

#114
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

#115
20190010569
2019-01-10

Process of producing a duplex stainless steel tube

#116
20180355451
2018-12-13

SEAMLESS STEEL PIPE AND METHOD OF MANUFACTURING THE SAME

#117
20180327882
2018-11-15

PROCESSES FOR PRODUCING THICKER GAGE PRODUCTS OF NIOBIUM MICROALLOYED STEEL

#118
20180327881
2018-11-15

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

#119
20180320244
2018-11-08

Track bushing

#120
20180312937
2018-11-01

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

#121
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

#122
20180298459
2018-10-18

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

#123
20180282833
2018-10-04

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

#124
20180274054
2018-09-27

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

#125
20180265941
2018-09-20

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

#126
20180237879
2018-08-23

STAINLESS STEEL PIPE AND METHOD OF MANUFACTURING THE SAME

#127
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

#128
20180223384
2018-08-09

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

#129
20180202015
2018-07-19

DEVICE FOR TREATING, BY HEAT TEMPERING, A METAL ELEMENT OF THE TUBE OR BAR TYPE HAVING ARCHED PORTIONS

#130
20180187280
2018-07-05

MECHANICAL COMPONENT

#131
20180187279
2018-07-05

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

#132
20180171426
2018-06-21

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

#133
20180142315
2018-05-24

Hardening apparatus for a long member, and a hardening method for a long member

#134
20180135154
2018-05-17

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

#135
20180117983
2018-05-03

Hollow stabilizer

#136
20180117628
2018-05-03

Internal quench system for cooling pipe

#137
20180105893
2018-04-19

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

#138
20180044748
2018-02-15

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

#139
20180002775
2018-01-04

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

#140
20170369963
2017-12-28

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

#141
20170349965
2017-12-07

Method of quenching steel pipe, apparatus for quenching steel pipe, method of manufacturing steel pipe and facility for manufacturing steel pipe

#142
20170349964
2017-12-07

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

#143
20170349963
2017-12-07

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

#144
20170335422
2017-11-23

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

#145
20170335421
2017-11-23

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

#146
20170306433
2017-10-26

High toughness heat-treated steel pipe having three-layer structure and manufacturing method thereof

#147
20170292177
2017-10-12

Thick-wall oil-well steel pipe and production method thereof

#148
20170292171
2017-10-12

Heat treated steel product having high strength and excellent chemical conversion coating ability and method of production of same

#149
20170283918
2017-10-05

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

#150
20170283898
2017-10-05

APPARATUS AND METHOD FOR QUENCHING RODS AND TUBES

#151
20170276265
2017-09-28

OCTG pipe system and method of manufacturing thereof

#152
20170275715
2017-09-28

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

#153
20170268075
2017-09-21

METHODS FOR QUENCHING METAL TUBES

#154
20170198367
2017-07-13

Quenching apparatus and method for producing metallic material

#155
20170130289
2017-05-11

High elastic modulus shafts and method of manufacture

#156
20170067129
2017-03-09

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

#157
20170066028
2017-03-09

Forming apparatus and forming method

#158
20170058374
2017-03-02

Hardening method of annular workpiece

#159
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

#160
20170016082
2017-01-19

Heat treatment system and heat treatment method

#161
20170016081
2017-01-19

OVERHEATING-INSENSITIVE FINE GRAINED ALLOY STEEL FOR USE IN DOUBLE HIGH-FREQUENCY HEAT TREATMENT AND METHOD OF MANUFACTURING THE SAME

#162
20160376677
2016-12-29

Method for producing a tempered seamlessly hot-fabricated steel pipe

#163
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

#164
20160326617
2016-11-10

Martensitic Cr-containing steel and oil country tubular goods

#165
20160326609
2016-11-10

Annealing furnace and method for annealing a steel strand

#166
20160305194
2016-10-20

Heat treated heavy weight drill pipe

#167
20160298206
2016-10-13

Wellbore tubular air quenching

#168
20160289812
2016-10-06

Process for manufacturing high-nitrogen stainless steel pipe with high strength, high ductility, and excellent corrosion and heat resistance

#169
20160281197
2016-09-29

Advanced Fe-5Cr-X Alloy

#170
20160279690
2016-09-29

Method for manufacturing a worked member using an induction heating coil

#171
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

#172
20160237519
2016-08-18

Lightweight boron tubular structure support integrated into seat structure

#173
20160230242
2016-08-11

REGENERATIVE HEAT TREATMENT METHOD FOR HEAT-RESISTANT METAL MEMBER SUFFERING FROM CREEP DAMAGE

#174
20160215359
2016-07-28

High-strength stainless steel pipe

#175
20160193687
2016-07-07

RESISTANCE WELDING METHOD FOR SUCKER ROD

#176
20160161028
2016-06-09

Seamless steel pipe for line pipe

#177
20160160307
2016-06-09

Low alloy oil well steel pipe and method for manufacturing same

#178
20160153063
2016-06-02

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

#179
20160076315
2016-03-17

Method for manufacturing superior 13Cr friction-welded drillrod

#180
20160068921
2016-03-10

Method and tool for hardening a hollow profile of a steel workpiece

#181
20160060738
2016-03-03

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

#182
20160052080
2016-02-25

Method for making clad metal pipe

#183
20160033059
2016-02-04

FLOWFORMING CORROSION RESISTANT ALLOY TUBES

#184
20160024625
2016-01-28

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

#185
20160010190
2016-01-14

PROCESSES FOR PRODUCING THICKER GAGE PRODUCTS OF NIOBIUM MICROALLOYED STEEL

#186
20150361518
2015-12-17

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

#187
20150345421
2015-12-03

COMBUSTION-CHAMBER BOWL RIM AND OF A COMBUSTION CHAMBER BOWL BASE OF A PISTON OF AN INTERNAL COMBUSTION ENGINE

#188
20150315685
2015-11-05

Seamless steel pipe and method for producing same

#189
20150315684
2015-11-05

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

#190
20150315667
2015-11-05

Method of manufacturing high strength stainless steel tube or pipe

#191
20150307972
2015-10-29

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

#192
20150247227
2015-09-03

Method for manufacturing heavy wall steel pipe

#193
20150247226
2015-09-03

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

#194
20150232974
2015-08-20

Ultra high strength alloy for severe oil and gas environments and method of preparation

#195
20150226014
2015-08-13

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

#196
20150176110
2015-06-25

Thick-walled high-strength hot rolled steel sheet with excellent low-temperature toughness and method of producing same

#197
20150152982
2015-06-04

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

#198
20150152531
2015-06-04

High strength stainless steel seamless pipe with excellent corrosion resistance for oil well and method of manufacturing the same

#199
20150137434
2015-05-21

Apparatus to quench a ring-shaped article

#200
20150137433
2015-05-21

Deformation correcting device

#201
20150083282
2015-03-26

Seamless steel pipe and method for producing the same

#202
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2015-03-26

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