Seamless pipes Execution Standard

A seamless pipe, as the name suggests, is a pipe without a seam or a weld-joint. Seamless pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids.

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 P5, P9 ,P11, P91, P22, P92
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
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.

Standards for Alloy pipes & tubes

ASTM A213 T91
ASTM A213M-09
Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A333 Grade 6 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
ASTM A333
Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications.
ASTM A335 P22 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding.
ASTM A335
ASTM A335/ASME SA335 standard specication for seamless ferritic alloy-steel pipe for high-temperature service
Related alloy steel products:
Carbon steel flanges
Alloy steel flanges
Alloy steel flange, that is, the main material is alloy steel flange or end flange connectors. It contains alloy steel flange, known as alloy steel flange.
Rare earth alloy wear-resistant tube
Rare earth alloy wear resistant pipe has the characteristics of fast velocity and high flow rate is used for pneumatic, pump slurry, etc.
Wear resistant alloy composite pipe
Wear resistant alloy composite pipe
Wear-resistant alloy steel pipe as the base, lined with ultra-wear-resistant alloy, through the centrifugal casting, metallurgy combined to form a solid.

Alloy steel specification, Standard and identification

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

ASTM A519-89 Standard specification

ASTM A519- specification covers for several grades of carbon and alloy steel mechanical tubing, either hot-finished or cold-finished.

EN10216 Standard specification

EN 10216 is a European standard suitable for seamless steel tubes for pressure purposes.

EN 10216 non alloy steel tubes EN 10216 non alloy steel tubes

The main steel grade:
  • P195GH, P235GH, P265GH, 13CrMo4-5, 10CrMo9-10
  • Other grades of steel pipe can be provided based on negotiations.

Industries We Serve

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

ASTM A335 P11 alloy pipe
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/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

 


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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