S355J2 A53 Carbon Steel Seamless Pipe
​A seamless pipe is a long strip of steel with a hollow section and no seams around it. According to different production methods, it can be divided into hot-rolled tubes, cold-rolled tubes, cold-drawn tubes, extruded tubes, etc. Generally used in fluid conveying pipes, boiler plants, engineering, mechanical processing plants.
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Product Description

A seamless pipe is a long strip of steel with a hollow section and no seams around it. According to different production methods, it can be divided into hot-rolled tubes, cold-rolled tubes, cold-drawn tubes, extruded tubes, etc. Generally used in fluid conveying pipes, boiler plants, engineering, mechanical processing plants. 

Seamless steel pipe production process:

1. Hot rolling (extruded seamless steel pipe): round tube billet → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → straightening → hydraulic test (or flaw detection) → marking → warehousing 

2. Cold drawn (rolled) seamless steel pipe: round tube blank→heating→piercing→heading→annealing→pickling→oiling (copper plating)→multi-pass cold drawing (cold rolling)→blank tube→heat treatment→straightening→water Pressure test (flaw detection) → marking → storage.

After the quality inspection of steel pipes, strict manual selection is required. Then spray the serial number, specification, production batch number, etc. with paint. And hoisted into the warehouse by crane. 

Hot-rolled seamless pipes are generally produced on automatic pipe rolling units. After checking and removing surface defects, the solid tube blank is cut into the required length, centered on the perforated end face of the tube blank, then sent to the heating furnace for heating, and pierced on the piercing machine. Spin and advance the solid blank inside the process of piercing holes under the influence with the roller as well as the end. Then the solid blank is hollow finally, which is called gross pipe. Send to the automatic pipe rolling machine to continue rolling. Finally, the wall thickness is adjusted by the equalizing machine, and the size is sized by the sizing machine to meet the specification requirements. It is a more advanced method to produce hot-rolled seamless steel pipes by using continuous rolling mills.

If you want to obtain seamless pipes with smaller size and better quality, you must use cold rolling, cold drawing or a combination of both. Cold rolling is usually carried out on a two-roll mill, and the steel pipe is rolled in an annular pass formed by a circular hole groove with variable cross-section and a stationary tapered plug. Cold drawing is usually carried out on a single-chain or double-chain cold drawing machine of 0.5-100T.

The extrusion method is to place the heated tube blank in a closed extrusion cylinder, and the perforated rod and the extrusion rod move together to make the extruded part extrude from the smaller die hole. This method can produce steel pipes with smaller diameters. 


Classification and material of seamless steel pipe

Product NameMaterialExecutive StandardSpot SpecificationsApplication
Alloy tube12Cr1MoVG
12CrMoG
15CrMoG

12Cr2MoCr5MoCr9Mo10Cr

9Mo1VNb15NiCuMoNb5

12Cr1MoVG
12CrMoG
15CrMoG

12Cr2MoCr5MoCr9Mo10Cr9Mo

1VNb15NiCuMoNb5

∮8-1240*1-200It is suitable for seamless steel pipes for high temperature resistance, low temperature resistance and corrosion resistance in petroleum, chemical industry, electric power and boiler industries.
stainless steel pipe0Cr18Ni9<304>
00Cr19Ni10<304L>
00Cr25Ni20<310S>
0Cr17Ni12Mo2<316>
00Cr17Ni14Mo2<316L>
1Cr18Ni9Ti<321>
0Cr18Ni10Ti
0Cr18Ni11Nb<347>
GB/T14975-2002
GB/T14976-2002
GB13296-2007
ASTM A213
ASTM A269
ASTM A312
JIS G3459
DIN 17458
∮6-630*0.5-60It is suitable for petroleum, aviation, smelting, food, water conservancy, electric power, chemical industry, chemical, chemical fiber, medical machinery and other industries.
Cryogenic tube16MnDG、10MnDG、09DG
09Mn2VDG、06Ni3MoDG
ASTM A333Grade1
ASTM A333Grade3
ASTM A333Grade4
ASTM A333Grade6
ASTM A333Grade7
ASTM A333Grade8
ASTM A333Grade9
ASTM A333Grade10
ASTM A333Grade11
GB/T18984-2003
ASTM A333
∮8-1240*1-200Suitable for -45℃~-195℃ low-temperature pressure vessel pipes and seamless steel pipes for low-temperature heat exchanger pipes.
High pressure boiler tube20G
ASTM SA106B/C
ASTM SA210A/C
ST45.8-III
GB5310-1995
ASTM SA106
ASTM SA210
DIN17175-79
∮8-1240*1-200Suitable for manufacturing high-pressure boiler heating pipes, headers, steam pipes, etc.
High pressure fertilizer pipe10
20
16Mn
GB6479-2000∮8-1240*1-200Suitable for chemical equipment and pipelines with a working temperature of -40--400°C and a working pressure of 10-32Mpa
Petroleum cracking tube10
20
GB9948-2006∮8-630*1-60Furnace tubes, heat exchanger tubes and pipes for petroleum refineries.
Low and medium pressure boiler tube10#
20#
16Mn
GB3087-2008∮8-1240*1-200Suitable for manufacturing low-pressure and medium-pressure boilers and locomotive boilers of various structures.
Fluid delivery tube10#、20#
ASTM A106A,B,C、A53A,B
16Mn
GB/T8163-2008
ASTM A106
ASTM A53
∮8-1240*1-200General seamless steel pipes suitable for conveying fluids.
General structural pipe10#、20#、45#、27SiMn
ASTM A53A,B
16Mn
GB/T8162-2008
GB/T17396-1998
ASTM A53
∮8-1240*1-200Suitable for general structures, engineering supports, machining, etc.
Oil CasingJ55、K55、N80、L80
C90、C95、P110
API SPEC 5CT
ISO11960
∮60.23-508.00
*4.24-16.13
Tubing is used to extract oil or natural gas in oil wells, and casing is used as the well wall of oil and gas wells.
Line pipeA、B、X42、X46、X52、X56、X60、X65、X70、X80
L245、L290、L360、L415、L450
API SPEC 5L
GB/T9711.1
GB/T9711.2
∮32-1240*3-100Oxygen, water and oil delivery pipes used in oil and gas industry.
straight seam steel pipe20、Q195、Q215A,B
Q235A,B、Q345A,B,C,D,E
GB/T13793-1992
GB3091-2001
∮32-630*1-30Suitable for general structural support, low-pressure fluid delivery, etc.
Spiral steel pipeQ235A-B、Q345A-ESY/T5037-2000219-2820*4-20Suitable for steel pipes for low-pressure fluid transmission.


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