2017 seamless steel tubes and pipes fort coupling stock of casing and boiler

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25 m.t.
Supply Capability:
6000 m.t./month

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Product Description:

1Structure of Welded Black ERW Steel Pipe: 

ERW steel pipe is electric resistance welding, the abbreviation for ERW for transporting oil and natural gas vapor liquid objects, can meet the requirements of high and low pressure, the transport in the world with pipe sector accounted for a pivotal position.


2‍‍Main Features of Welded Black ERW Steel Pipe:

• High manufacturing accuracy

• High strength

• Good visual effect

• Reasonable price  

• Small inertia resistance

• Strong heat dissipation ability


3‍‍ Welded Black ERW Steel Pipe Images ‍‍


Packaging & Delivery

    Packaging Details:

    seaworthy package,bundles wrapped with strong steel strip

    Delivery Detail:

    15-30days after received 30%TT

4Welded Black ERW Steel Pipe Specification




ASTM A106-2006, ASTM A53-2007




1 - 33 mm

Section Shape


Outer Diameter

21 - 610 mm

Place of Origin

Tianjin, China (Mainland)

Secondary Or Not



Hydraulic Pipe


Cold Drawn



Surface Treatment

factory state or painted black

Special Pipe

API Pipe

Alloy Or Not




Outer Diameter



20#, 45#, Q345, API J55, API K55, API L80, API N80, API P110, A53B



1.Material:20#(ASTM A 106/A53 GRB.API5LGRB,GB),45#,16Mn,10#.
2.Specification range:OD:21.3-610mm,WT:6-70mm,length:6-12m or according to the requirement of clients.
3.Excutive standards:GB,ASME API5L.ASTM A 106/A53,Despite of the above standards,we can also supply seamless steel pipe with standard of DIN,JIS,and     so on,and also develop new products according to the requirements of our clients!
4.Surface:black lacquered,varnish coating or galvanized.
5.Ends:Beveled or square cut,plastic capped,painted.
6.Packing:bundles wrapped with strong steel strip,seaworthy packing. 

2017 seamless steel tubes and pipes fort coupling stock of casing and boiler

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Q:Difference and application of seamless hot rolled pipe and cold drawn pipe in seamless steel tube
purpose2.1 seamless tubes are widely used. General purpose seamless tubes are rolled from plain carbon structural steel, low-alloy structural steel or alloy structural steel, with the most output and are used primarily as pipes or structural parts for conveying fluids2.2, divided into three kinds according to the supply of different uses: the supply of a, according to the chemical composition and mechanical properties; the supply of B, according to the mechanical properties; the supply of C, according to the hydraulic pressure test. According to a, the B class steel supply, such as for under fluid pressure, but also to the pressure test.2.3. Seamless tubes for special purposes include seamless tubes for boilers, seamless tubes for geology, and seamless pipes for petroleum use
Q:Seamless steel pipe and welded pipe what is the difference?
Seamless steel pipe is made of solid round tubes and perforated without gaps. The welded pipe is made of steel or strip after welding and has a slit. Generally seamless pipe can be greater pressure on the city.
Q:There are multiple welded galvanized steel pipe outer diameter 108mm wall thickness 4mm length of 6 meters
Galvanized steel pipe is divided into cold galvanized steel pipe, hot galvanized steel pipe, cold galvanized steel pipe has been banned, and the latter is also advocated by the state for the moment, can be used. In 60s and 70s, developed countries began to develop new types of pipes, and galvanized pipes were banned. China's Ministry of construction and other four ministries also issued a civilization, indeed from two, 000 years since the galvanized pipe as a water supply pipe, the New District cold water pipe has rarely used galvanized pipe, and some of the hot water pipe is galvanized pipe. Hot dip galvanized steel pipe is widely used in fire, power and highway.
Q:Heating system DN40 and DN32 welded steel pipe how to connect?
Welding: AC arc welding machine welding. Mode 1: apply to the medium of non demanding piping, DN40 steel pipe necking and DN32 steel pipe butt welding, or directly DN32 steel pipe into the DN40 internal welding. 2: the pipeline requirements apply to the inner wall of smooth transition, reducing short circuit welding for DN40x32 suppression of this mechanism are used for connection pipe seamless steel pipe high pressure pipeline connection, no special requirements, not commonly used welded steel pipe. Connection of mechanism fittings is not only costly, but not necessary unless special requirements are required!
Q:What is the diameter of the steel tube DN20?
Usually the nominal diameter is nominal for cast iron pipe, steel pipe joints, concrete pipe pipe, seamless steel pipe does not use this notation (with diameter * wall thickness). With nominal diameter pipeline accessories, meaning with tube.
Q:What is the size of seamless steel tube DN150?
Seamless steel tube is generally used to indicate the outer diameter * wall thickness, DN150 seamless steel pipe GB wall thickness is 5mm. Wall thickness is a series of calculations based on your design, pressure, temperature, and pipe material.
Q:What is ND steel pipe?
ND steel also has the ability to resist chloride ion corrosion. ND steel pipe, the main reference indicators (70 degrees Celsius, 50%H2SO4 solution immersion 24 hours), and carbon steel, Japan imported similar steel, stainless steel corrosion resistance compared to higher than these steel grades. Products by domestic refineries and manufacturing units after the use of widely acclaimed, and achieved good results.
Q:Does the seamless steel pipe need rust removal?
Chemical and electrolytic methods are generally used for pickling treatment. The pipeline corrosion only uses chemical pickling, which can remove oxide, rust and old coating. Sometimes, it can be treated as sand blasting after rust removing. Two. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, but its anchor grain is shallow, and easy to pollute the environment.
Q:Where is the difference between seamless steel pipe and welded pipe
Seamless pipe pressure is higher, welded pipe is generally in 10 or so MPa, now welded pipe to do seamless processing.
Q:How to make the steel pipe spray paint is not easy to fall off?
First, clean the surface of the object to be sprayed (pay attention to whether or not to paint off, which is the key):Remove rust stains, oil and so on, when spraying, the nozzle and spray the best distance is 20cm, should be two times forming, first thin spray again, dry, and then spray second times, this is more uniform, and not easy to hang

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