Seamless steel pipes

We can makes and markets cold-drawn and hot rolled seamless steel pipes without a seam or a weld-joint.

DIN17175/EN10216 standard specification

DIN 17175 steel pipes are used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high temperature and high-pressure devices.
Application Features Specifications Chemical Composition Mechanical Properties

This alloy steel pipe is just a big class,and it has many classifivations.
We mainly produce DIN 17175 ST35.8,DIN 17175 ST45.8, and 10CrMo910 steel pipes.

Application: used for the pipelines of boiler industry.

Packing:
Inner packing:Caps on two ends of every pipe

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements.

Surface treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.

Marking: as per customer’s requirement

Read more:
Features Specifications
OD(mm) 　 Wall Thickness Unit(mm)
2 2.5 3 3.5 4 4.5 5 6 6.5-7 7.5-8 8.5-9 9.5-10 11 12
Φ25-Φ28 ● ● ● ● ● ●  　  　  　  　  　  　  　  　
Φ32  　 ● ● ● ● ● ●  　  　  　  　  　  　  　
Φ34-Φ36  　 ● ● ● ● ● ●  　  　  　  　  　  　  　
Φ38  　 ● ● ● ● ● ●  　  　  　  　  　  　  　
Φ40  　  　 ● ● ● ● ●  　  　  　  　  　  　  　
Φ42  　  　 ● ● ● ● ●  　  　  　  　  　  　  　
Φ45  　  　 ● ● ● ● ● ●  　  　  　  　  　  　
Φ48-Φ60  　  　 ● ● ● ● ● ● ●  　  　  　  　  　
Φ63.5  　  　  　 ● ● ● ● ● ● ●  　  　  　  　
Φ68-Φ73  　  　  　  　 ● ● ● ● ● ●  　  　  　  　
Φ76  　  　  　  　 ● ● ● ● ● ● ● ● ● ●
Φ80  　  　  　  　 ● ● ● ● ● ● ● ● ● ●
Φ83  　  　  　  　 ● ● ● ● ● ● ● ● ● ●
Φ89  　  　  　  　 ● ● ● ● ● ● ● ● ● ●
Φ95  　  　  　  　 ● ● ● ● ● ● ● ● ● ●
Φ102  　  　  　  　 ● ● ● ● ● ● ● ● ● ●
Φ108  　  　  　  　 ● ● ● ● ● ● ● ● ● ●
Φ114  　  　  　  　  　 ● ● ● ● ● ● ● ● ●
Φ121  　  　  　  　  　 ● ● ● ● ● ● ● ● ●
Φ127  　  　  　  　  　 ● ● ● ● ● ● ● ● ●
Φ133  　  　  　  　  　 ● ● ● ● ● ● ● ● ●
Φ140  　  　  　  　  　  　 ● ● ● ● ● ● ● ●
Φ146  　  　  　  　  　  　 ● ● ● ● ● ● ● ●
Φ152  　  　  　  　  　  　 ● ● ● ● ● ● ● ●
Φ159  　  　  　  　  　  　 ● ● ● ● ● ● ● ●
Φ168  　  　  　  　  　  　 ● ● ● ● ● ● ● ●
Chemical composition and Mechanical Property DN17175

Grade

Chemical Composition

Mechanical Property

C Si Mn P≤ S≤

Cr

Mo

(MPa)

(MPa)

(%)
St35.8 ≤0.17 0.10~
0.35		 0.40~
0.80		 0.030 0.030 / / 360~480 ≥235 ≥25
St45.8 ≤0.21 0.10~
0.35		 0.40~
1.20		 0.030 0.030 / / 410~530 ≥255 ≥21
15Mo3 0.12~
0.20		 0.10
~0.35		 0.40~
0.80		 0.030 0.030 / 0.25~
0.35		 460~600 ≥270 ≥20

Chemical composition and Mechanical Property of EN10216-2

Grade

Chemical Composition

Mechanical Property

C

Si

Mn

P≤

S≤

Cr≤

Mo

(MPa)

(MPa)

L t
195GH ≤0.13 ≤0.35 ≤0.70 0.025 0.020 0.30 ≤0.08 320~440 ≥195 ≥27 ≥25
P235GH ≤0.16 ≤0.35 ≤1.20 0.025 0.020 0.30 ≤0.08 360~500 ≥235 ≥25 ≥23
P265GH ≤0.20 ≤0.40 ≤1.40 0.025 0.020 0.30 ≤0.08 410~570 ≥265 ≥23 ≥21
20MnNb6 ≤0.22 0.15~
0.35		 1.00~ 1.50 0.025 0.020 - - 500~650 ≥355 ≥22 ≥20
16Mo3 0.12~
0.20		 ≤0.35 0.40~ 0.90 0.025 0.020 0.30 0.25~
0.35		 450~600 ≥280 ≥22 ≥20


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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