GB steel pipes

The GB steel pipes are made from a ingot or a solid billet through piercing, and then by hot rolling, cold rolling or cold dial.

GB/T 8163



Tubing shall be made seamless, plain or upset and coupling with high-seal connections. Coupling-free connections are possible.
GB/T18984 Low-temperature heat exchanger tubes
GB/T18984-2003 standard suitable for -49 to -148 degrees F cryogenic pressure vessel piping, and low-temperature heat exchanger tubes seamless steel pipe.
GB5310 20G boiler steel pipe
GB 5310- 2008 standard is applicable to seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines.
GB3087 steel pipe
GB3087-2008 is applicable to the seamless steel tubes that are made of quality carbon structural steels and used for manufacturing various low and medium pressure boilers.
Seamless steel pipe Q245R grade (equal to 20G)
20G seamless steel pipe is a high-quality carbon structural steel, boiler material, the carbon content of 0.17-0.24%. tensile strength of 410Mpa, yield point 230-250Mpa.

国标无缝钢管是用钢锭或实心管坯经穿孔制成毛管,然后经热轧、冷轧或冷拨制成。国标钢管在我国钢管业中具有重要的地 位。据不完全统计,我国现有国标钢管生产企业约240多家,无缝钢管机组约250多套.

GB/T 12770-2002  

Stainless steel welded pipe for mechanical structure

GB/T 12771-2000

Welded stainless steel tubes for fluid transport

GB/T 13793-1992  

Straight seam welded steel pipe

GB/T 14975-2002
Seamless stainless steel structure
GB/T 14976-2002

Stainless steel seamless tubes for fluid transport

GB/T 18984-2003

Seamless steel tubes for low temperature pipe

GB/T 3639-2000

Cold drawn or cold-rolled precision seamless steel tube

GB 3087-1999

Seamless steel tubes for low and medium pressure boiler

GB/T 3091-2001

Welded steel pipe for low pressure liquid delivery

GB 5310-1995

Seamless steel tube for high pressure boiler

GB/T 5312-1999

Marine carbon and carbon manganese steel seamless steel pipe

GB 6479-2000

Seamless steel tubes for high-pressure chemical fertilizer equipment

GB/T 8162-1999

Seamless steel tubes for structure

GB/T 8163-2008

Seamless pipe conveying fluid

GB 9948-2006

Seamless steel tubes for petroleum cracking

GB/T 14976-2002

Stainless steel seamless tubes for fluid transport

GB/T 20409-2006

For high pressure boiler seamless pipe thread

GB/T 14291-2006

Welded steel pipe for mine fluid transport

GB 9948-2006

Seamless steel tubes for petroleum cracking

CJ/T 3022-1993

Spiral seam submerged arc welded steel pipe for urban heating

GB/T 9711.1-1997

Industrial oil gas transportation pipe technical delivery conditions - part first: steel pipes

SY/T 5038-1992

Spiral seam high frequency welded steel pipe for ordinary fluid transmission pipeline


Seamless steel tubes for boilers and heat exchangers


Welded steel tubes for boilers and heat exchangers

SY/T 5037-2000

Spiral seam submerged arc welded steel pipe for low pressure fluid transmission pipeline

DL/T 5017-2007

Specification for fabrication, installation and acceptance of penstocks for hydropower and water conservancy projects

偏差等级 标准化外径允许偏差
D1 ±1.5%,最小±0.75 mm
D2 ±1.0%。最小±0.50 mm
D3 ±0.75%.最小±0.30 mm
D4 ±0.50%。最小±0.10 mm
DIN/EN steel pipe
GB steel pipes
JIS seamless pipes

Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
How to calculate a steel pipe and tube theoretic weight
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.
Condition on delivery:

It refers to the state of final plastic deformation or final heat treatment of the delivered product. The hot-rolled or cold drawn (rolled) state or manufacturing state generally delivered without heat treatment; the heat-treated state after heat treatment delivery, or the normalizing, tempering, solid solution, annealing according to the type of heat treatment status.

Delivery status Abbreviation Description

(cold-finished as-drawn)

BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
(lightly cold-worked)
BKW After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

Delivery according to actual weight or delivery according to theoretical weight



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