ClassID:

119078

C21D9/08 - page 3 - CPC Classification

Classification description:

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

Recent Application in this class:
#601
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

#602
20070101789
2007-05-10

Seamless steel tubes and method for producing the same

#603
20070089813
2007-04-26

Seamless steel tube which is intended to be used as a guide pipe and production method thereof

#604
20070074793
2007-04-05

Highly anticorrosive high strength stainless steel pipe for linepipe and method for manufacturing same

#605
20070006946
2007-01-11

Manufacturing method of martensite stainless seamless steel pipe

#606
20060266448
2006-11-30

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

#607
20060260378
2006-11-23

Method of working metal, metal body obtained by the method and metal-containing ceramic body obtained by the method

#608
20060243355
2006-11-02

Stabilizer bar

#609
20060243354
2006-11-02

High strength stainless steel pipe for use in oil well having superior corrosion resistance and manufacturing method thereof

#610
20060219333
2006-10-05

Manufacturing method of seamless steel pipe for mechanical structural parts

#611
20060219332
2006-10-05

Manufacturing method of high strength, high toughness seamless steel pipe for linepipe

#612
20060201592
2006-09-14

High-strength steel pipe of API X65 grade or higher

#613
20060197638
2006-09-07

Induction heating stress improvement

#614
20060175742
2006-08-10

Track bushing and method and apparatus for producing the same

#615
20060169375
2006-08-03

Method for manufacturing martensitic stainless steel tube

#616
20060169368
2006-08-03

Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same

#617
20060144481
2006-07-06

Track bushing and method and apparatus for producing the same

#618
20060144480
2006-07-06

Track bushing and method and apparatus for producing the same

#619
20060130945
2006-06-22

Steel pipe for an airbag system

#620
20060124211
2006-06-15

Steel pipe for an airbag inflator and a process for its manufacture

#621
20060113011
2006-06-01

Martensitic stainless steel pipe

#622
20060113010
2006-06-01

Heat treatment method and device for piping

#623
20060096346
2006-05-11

Method for the economical production of heat exchanger tubes bent in a u-shape

#624
20060065327
2006-03-30

Fine-grained martensitic stainless steel and method thereof

#625
20060060270
2006-03-23

Nano-scale nitride-particle-strengthened high-temperature wrought ferritic and martensitic steels

#626
20060060267
2006-03-23

Method for extending the life of thin walled tubing and austempered weld stress relieved thin walled tubing

#627
20050257861
2005-11-24

Dual seam-welded air hardenable steel tubing and structural members

#628
20050211348
2005-09-29

Heat-resistant ferritic stainless steel and method for production thereof

#629
20050191509
2005-09-01

Cold finished seamless steel tubes

#630
20050178456
2005-08-18

UOE steel pipe excellent in collapse strength and method of production thereof

#631
20050167013
2005-08-04

High strength seamless steel pipe excellent in hydrogen-induced cracking resistance

#632
20050115647
2005-06-02

Martensitic stainless steel seamless pipe and a manufacturing method thereof

#633
20050087271
2005-04-28

Reinforced member

#634
20050087269
2005-04-28

Method for producing line pipe

#635
20050081964
2005-04-21

A Method Of Establishing Stress Relieving Procedures For Minimizing Sulfide Stress Cracking In Cold Worked Metals

#636
20050061404
2005-03-24

Method of producing a cold temperature high toughness structural steel

#637
20050039826
2005-02-24

High strength steel pipe for an air bag

#638
20050034795
2005-02-17

Highly impact-resistant steel pipe and method for producing the same

#639
20050000601
2005-01-06

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

#640
15641164
2020-04-28

Gun barrel manufacturing methods

#641
15182578
2017-07-04

Gun barrel manufacturing methods

#642
14972110
2018-11-13

Thermal scavenging system to remove residue from interior surface of seamless tube in a bright annealing furnace

#643
14608169
2017-12-26

Cylinder liner and method of forming the same