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Seamless Steel Pipe

What is Seamless Steel Pipe

How to define a seamless steel pipe? Seamless steel pipe is also known as smls pipe, it is manufactured without seam welds. These pipes are manufactured from steel billets which are heated and drilled to generate the tubular section.

Seamless Pipe in Oil and Gas Industry(OCTG Pipe)

Seamless pipes can be utilized for different purposes in the oil and gas industry such as upstream operations, midstream operations like carrying and distribution of different fluids like oil, gas, slurries, steam, and acids. Also used in downstream operations like process piping to refine oil and gas in secondary produce. Seamless Pipes are suitable to be used in general plumbing applications in this industry.

Various Types of Seamless Steel Pipes Manufactured by Longteng

Longteng owns hot-rolled seamless steel pipe production line is the third most advanced small-diameter continuous rolling mill in China. It can produce OCTG Pipes, Fluid Pipes, Boiler Pipe and Tubes, High value-added products such as Hydraulic Pillar Pipes, Cylinder Sleeves, Structural Pipe, Seamless Pipes for Shipbuilding and Bearings.

ASTM/ASME Standard – Seamless Steel Pipe

Product nameExecutive standardSteel code/ Steel grade
Black and Hot-dipped Zinc-coated Steel Seamless PipesASTM A53GR.A, GR.B, GR.C
Seamless Carbon Steel for High Temperature ServiceASTM A106GR.B, GR.C
Seamless Cold-drawn Low-Carbon Steel Heat-Exchanger and Condenser TubesASTM A179Low Carbon Steel
Seamless Carbon Steel Boiler Tubes for High PressureASTM A192Low Carbon Steel
Seamless Cold-drawn Intermediate Alloy Steel Heat-exchanger and Condenser TubesASTM A199T5, T22
Seamless Medium-carbon Steel Boiler and Superheater TubesASTM A210A1, C
Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-exchanger TubesASTM A213T5, T5b, T9 , T11, T22 ,T91
Seamless Carbon and Alloy Steel for Mechanical TubingASTM A333Grade1 Gr. 3,Gr..6, Gr.8 , Gr. 9
Seamless Cold-drawn Carbon Steel Feedwater Heater TubesASTM A556A2, B2
Round and shaped steel cold formed welded and seamless carbon steel structural pipe.ASTM A500Grade A, B, C, D
Welded and seamless steel pipe for piling purposes.ASTM A252A252 Grade 1, 2 & 3
For seamless ferritic alloy-steel pipe for high-temperature serviceASTM A335A/SA 335 P1, P2, P11, P12, P15, P22, P91, P92, P122

Din Standard – Seamless Steel Pipe

Product nameExecutive standardSteel code/ Steel grade
Seamless Steel Tubes for Elevated TemperatureDIN 17175St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36
Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements.DIN 1629St37.0, St44.0, St52.0
Seamless steel tubes for pressure purposesEN 10216P235GH TC1, P235GH TC2, 16Mo3
hydraulic and pneumatic power system, low-voltage circuit, power steering, fuel circuit, vibration reduction, and such.EN 10305St33.2
specifies the Seamless steel tubes used forMechanical and Automobile.DIN 2391St35, St45, St52
Seamless Steel TubesDIN 2440St33.2

JIS Standard – Seamless Steel Pipe

Product nameExecutive standardSteel code/ Steel grade
High pressure and high temperature serviceJIS G3454/5/6JIS G3454(STPG370, STPG410), JIS G3455(STS370, STS410, STS480), JIS G3456(STPT370, STPT410, STPT480)
Tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.JIS G3445STKM11A, STKM12(A,B,C), STKM13(A,B,C), STKM14(A,B,C).
Carbon steel/Alloy steel boiler and heat exchanger tubesJIS G3461,2G3461(STB340, STB410, STB510)
G3462(STBA22, STBA23)
Seamless steel tubes for high pressure gas cylinderJIS G3429STH11, STH12, STH21, STH22
Heat resistant alloy steel pipes that are used for high temperature conveying fluid pipes for heaters and boiler tubes.JIS G3458STPA 12, STPA 20, STPA 22, STPA 23, STPA 24, STPA 25, STPA 26

Seamless Pipe Dimensions

(WT)mm 0.6-0.8 0.9-1.2 1.3-1.6 1.7-2.2 2.3-2.9 3-4.5 4.6-5.5 5.6-7.5 7.6-9 9.1-12 12.1-16 16.1-24 24.1-32
(OD)mm
5–7                
8–10              
11–16              
17-25            
26-35              
36-45                
46-56            
57-65              
66-76              
77-100              
101-114                
115-133          
134-159          
160-219          
220-273            
274-325              

Longteng may produce GB standard of steel pipe to meet domestic Asian buyers’ demand, we also provide wide range of international industrial standard such as ASTM, ANSI and API, ASME, DIN, JIS .

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Why Seamless Steel Pipe is Used Widely

Seamless Steel Pipe Manufacturing

Seamless Steel Pipe can be produced in the following process, hot rolling or cold drawn, it has the advantages of easy bending and flanging, and can bear certain degrees of pressure, which makes it suitable for boiler and pressure vessel for high-pressure application.

Structural and Tested Pipe is produced by Longteng in seamless type with a variety of sizes to meet the structural and mechanical piping requirements for applications in water, petroleum, oil & gas, construction and other industries. We supply large quantity of carbon steel pipe and low alloy high strength steel pipe for worldwide customers.

Seamless steel pipe can be processed in the following methods: cut to length, threaded or grooved. And the coating method includes black/red lacquer, varnish painting, hot dip galvanization, etc.

Seamless steel Pipe vs Seamless Steel Tube

In the market there are seamless steel tube and seamless steel pipe, there is only a slight difference, both seamless steel tube and seamless steel pipe are often used for the same type of steel product, for they have same type of round hollow shape, there are important distinctions between the two when defining seamless pipe and seamless tube. Seamless Tubes are measured by the outside diameter (OD) and wall thickness. While seamless pipe is measure by its inside diameter (ID). According to their application, seamless tube is generally used in structural and aesthetic applications whereas seamless pipe is used for transporting fluids, liquids, and gases.

Longteng supplies various types of seamless steel pipe and tube product for different industries, if you need more details about seamless pipe product, feel free to contact us now!

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