The quality standards for seamless steel pipe

Seamless ( CARBON SMLS) Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow tube.

Below is the standard what we can produce for the pipes :

It can also be used for structural applications; hollow pipe is far stiffer per unit weight than solid members. Seamless pipe is thought to be able to withstand higher pressure, higher temperatures, higher mechanical stress and a corrosive atmosphere. It can be found in a wide range of applications such as in oil and gas, refinery, petrochemical, chemical, fertilizer, power, automotive, bearing, mechanical and structural.

The production of our seamless pipes is tightly regulated and all of the pipes we stock have been fully tested to international standards to ensure we only supply the highest quality products.

Available Specification standaard
API Spec 5CT API Spec 5L ASTM/ASME GS/ DIN JIS

We can makes and markets cold-drawn and hot rolled seamless steel pipes and cold-drawn special-section seamless pipes which are widely applied in the industries of petrochemical, boiler, automobile, mechanical, construction.

API SPEC 5L/ 5CT

Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.

Product name Executive standard Dimension (mm) Steel code/ Steel grade
Casting API 5CT 114-219 x 5.2-22.2 J55, K55, N80, L80, P110
Tubing API 5CT 48.3-114.3 x 3.2-16 J55, K55, N80, L80, H40
Casting API 5L 10.3-1200 x1.0-120 A, B, X42, X46, X52, PSL1 / PSL2
ASTM / ASME

American Society for Testing and Materials(ASTM), American Society of Mechanical Engineers (ASME)

Product name Executive standard Dimension (mm) Steel code/ Steel grade
Black and Hot-dipped Zinc-coated Steel Pipes Seamless ASTM A53 0.3-1200 x 1.0-150 GR.A, GR.B, GR.C
Seamless Carbon Steel for High Temperature Service ASTM A106 10.3-1200 x 1.0-150 GR.B, GR.C
Seamless Cold-drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes ASTM A179 10.3-426 x 1.0-36 Low Carbon Steel
Seamless Carbon Steel Boiler Tubes for High Pressure ASTM A192 10.3-426 x 1.0-36 Low Carbon Steel
Seamless Cold-drawn Intermediate Alloy Steel Heat-exchanger and Condenser Tubes ASTM A199 10.3-426 x 1.0-36 T5, T22
Seamless Medium-carbon Steel Boiler and Superheater Tubes ASTM A210 10.3-426 x 1.0-36 A1, C
Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-exchanger Tubes ASTM A213 10.3-426 x 1.0-36 T5, T5b, T9 , T11, T22 ,T91
Seamless Carbon and Alloy Steel for Mechanical Tubing ASTM A333 1/4"-42" x SCH20-XXS Grade1 Gr. 3,Gr..6, Gr.8 , Gr. 9
Seamless Cold-drawn Carbon Steel Feedwater Heater Tubes ASTM A556 10.3-426 x 1.0-36 A2, B2
For seamless ferritic alloy-steel pipe for high-temperature service ASTM A335 1/4"-42" x SCH20-XXS  
DIN/EN

Germany Safety(GS), Deutsches Institut für Normung(DIN)

Product name Executive standard Dimension (mm) Steel code/ Steel grade
Seamless Steel Tubes for Elevated Temperature DIN 17175 10-762 x 1.0-120 St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36
Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements. DIN 1629 13.5-762 x 1.8-120 St37.0, St44.0, St52.0
Seamless steel tubes for pressure purposes EN 10216 4.0-60.0 x 0.5-8
5-7 m manufacturing lenght
P235GH TC1, P235GH TC2, 16Mo3
hydraulic and pneumatic power system, low-voltage circuit, power steering, fuel circuit, vibration reduction, and such. EN 10305 13.5-165.1 x 1.8-4.85 St33.2
specifies the Seamless steel tubes used forMechanical and Automobile. DIN 2391 4.0-60.0 x 0.5-8 St35, St45, St52
Seamless Steel Tubes DIN 2440 13.5-165.1 x 1.8-4.85 St33.2
JIS

Japanese Industrial Standards (JIS) specifies the standards used for industrial activities in Japan.

Product name Executive standard Dimension (mm) Steel code/ Steel grade
High pressure and high temperature service JIS G3454/5/6 19.05-114.3 x 2.0-14 JIS 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 G3445 19.05-114.3 x 2.0-14 STKM11A, STKM12(A,B,C), STKM13(A,B,C), STKM14(A,B,C).
Carbon steel/Alloy steel boiler and heat exchanger tubes JIS G3461,2 19.05-114.3 x 2.0-14 G3461(STB340, STB410, STB510)
G3462(STBA22, STBA23)
Seamless steel tubes for high pressure gas cylinder JIS G3429 19.05-114.3 x 2.0-14
Length: max 16000mm
STH11, STH12, STH21, STH22
Heat resistant alloy steel pipes that are used for high temperature conveying fluid pipes for heaters and boiler tubes. JIS G3458 10.5-660.4 mm STPA 12, STPA 20, STPA 22, STPA 23, STPA 24, STPA 25, STPA 26
GB 国标
Product name Executive standard Dimension (mm) Steel code/ Steel grade
Used for manufacturing various low and medium pressure boilers. GB 3087 19.05-114.3 x 2.0-14 10#, 20#
Low-temperature heat exchanger tubes seamless steel pipe GB/T18984 19.05-351 x 2.0-14 06Ni3MoDG, 09DG, 09Mn2VDG, 10MnDG, 16MnDG
GB 8163 steel pipe is a seamless steel pipe for fluid transportation (GB/T8163-2018) GB/T 8163 19.05-351 x 2.0-14 10#
High pressure and above pressure steam boiler tubes with high quality carbon structural. GB5310 19.05-114.3 x 2.0-14 20G, 20MnG, 25MnG, 15MoG, 20MoG, 12CrMoG, 15CrMoG(T12/P12), 12CrMoG, 12Cr2MoWVTiB.

The seamless pipe is then finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 34 inch OD.

Sunny Steel can secure and process your Seamless Pipe order, including specialized requirements and cut to length up to 50 feet in length and wallthickness max with 50mm or even greater.

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.
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.


SUNNY STEEL

Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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