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/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.

国标钢管执行标准及相关参数:

无缝钢管是一种具有中空截面、周边没有接缝的长条钢材。钢管具有中空截面,大量用作输送流体的管道,如输送石油、天然气、煤气、水及某些固体物料的管道等。

Tubing shall be made seamless, plain or upset and coupling with high-seal connections. Coupling-free connections are possible.
常用的国标钢管执行标准
GB/T 8163
GB/T 12770-2002  

机械结构用不锈钢焊接钢管
Stainless steel welded pipe for mechanical structure

GB/T 12771-2000

流体输送用不锈钢焊接钢管
Welded stainless steel tubes for fluid transport

GB/T 13793-1992  

直缝电焊钢管
Straight seam welded steel pipe

GB/T 14975-2002
结构用不锈钢无缝钢管
Seamless stainless steel structure
GB/T 14976-2002

流体输送用不锈钢无缝钢管
Stainless steel seamless tubes for fluid transport

GB/T 18984-2003

低温管道用无缝钢管
Seamless steel tubes for low temperature pipe

GB/T 3639-2000

冷拔或冷轧精密无缝钢管
Cold drawn or cold-rolled precision seamless steel tube

GB 3087-1999

低中压锅炉用无缝钢管
Seamless steel tubes for low and medium pressure boiler

GB/T 3091-2001

低压流体输送用焊接钢管
Welded steel pipe for low pressure liquid delivery

GB 5310-1995

高压锅炉用无缝钢管
Seamless steel tube for high pressure boiler

GB/T 5312-1999

船舶用碳钢和碳锰钢无缝钢管
Marine carbon and carbon manganese steel seamless steel pipe

GB 6479-2000

高压化肥设备用无缝钢管
Seamless steel tubes for high-pressure chemical fertilizer equipment

GB/T 8162-1999

结构用无缝钢管
Seamless steel tubes for structure

GB/T 8163-2008

输送流体用无缝钢管
Seamless pipe conveying fluid

GB 9948-2006

石油裂化用无缝钢管
Seamless steel tubes for petroleum cracking

GB/T 14976-2002

流体输送用不锈钢无缝钢管
Stainless steel seamless tubes for fluid transport

GB/T 20409-2006

高压锅炉用内螺纹无缝钢管
For high pressure boiler seamless pipe thread

GB/T 14291-2006

矿山流体输送用电焊钢管
Welded steel pipe for mine fluid transport

GB 9948-2006

石油裂化用无缝钢管
Seamless steel tubes for petroleum cracking

CJ/T 3022-1993

城市供热用螺旋缝埋弧焊钢管
Spiral seam submerged arc welded steel pipe for urban heating

GB/T 9711.1-1997

石油天然气工业输送钢管交货技术条件第1部分:A级钢管
Industrial oil gas transportation pipe technical delivery conditions - part first: steel pipes

SY/T 5038-1992

普通流体输送管道用螺旋缝高频焊钢管
Spiral seam high frequency welded steel pipe for ordinary fluid transmission pipeline

GB/T13296

锅炉和热交换器用无缝钢管
Seamless steel tubes for boilers and heat exchangers

GB/T28413

锅炉和热交换器用焊接钢管
Welded steel tubes for boilers and heat exchangers

SY/T 5037-2000

低压流体输送管道用螺旋缝埋弧焊钢管
Spiral seam submerged arc welded steel pipe for low pressure fluid transmission pipeline

DL/T 5017-2007

水电水利工程压力钢管制造安装及验收规范
Specification for fabrication, installation and acceptance of penstocks for hydropower and water conservancy projects

国标钢管尺寸及允许偏差
国标钢管重量公式:[(外径-壁厚)*壁厚]*0.02466=kg/米(每米的重量)
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


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/hard
(cold-finished as-drawn)

BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(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

  • Actual weight - at the time of delivery, the weight of its product is delivered according to the weighing (weighing) weight;
  • Theoretical weight - The weight of the product at the time of delivery is calculated from the nominal size of the steel.
 


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