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Seamless Square Tube

Short Description:

Name: ASTM A270 TP304/TP304L Stainless Steel Welded Pipe Square Pipe Seamless Pipe

Standard: ASTM, GB, JIS, DIN, EN, AISI

Material Grade: TP304 TP304L TP316 TP316L TP347 TP347H TP321 TP321H TP310 TP310S TP410 TP410S TP430 S31803/S32205 S32750 S32760

Outer Diameter: Seamless Pipe: 4mm-812.80mm

Welded Pipe: single slit(Φ8mm-Φ630mm); girth(Φ630mm-Φ3000mm),

Thickness: Seamless Pipe: 0.5mm – 60mm

Welded Pipe: single slit(0.5mm-25mm);girth(3mm-45mm)

Length: 5.8-6.1 m or as customers’ request

Tolerance: Acording to the Standard.

Surface: 180G, 320G, 400G Satin / Hairline

400G, 500G, 600G or 800G Mirror finish

Test: UT, ET, HT, RT,ect, and others according to the standard,or as the requests of the customers

Certificate: ISO9001-2008, ASME, PED

Delivery Time: 3-25 Days, Depends on quant

Product Detail

Product Tags

Execution Standard

Q345D Seamless square tube GB17396-1998

General Purpose

1. Seamless steel pipe for structure (GB/T8162-1999) is used for general structure and mechanical structure of seamless steel pipe.

2. Seamless steel pipe for fluid transportation (GB/T8163-1999) is used for conveying water, oil, gas and other fluids in general seamless steel pipe.

3. Seamless steel tubes for low and medium pressure boilers (GB3087-1999) are high quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel tubes, which are used for manufacturing superheated steam pipes, boiling water pipes for various structures of low and medium pressure boilers and superheated steam pipes, big smoke pipes, small smoke pipes and arch brick pipes for locomotive boilers.

4. Seamless steel tube for high pressure boiler (GB5310-1995) is used for manufacturing high pressure and above pressure water tube boiler heating surface with high quality carbon steel, alloy steel and stainless steel seamless steel tube.

5. High pressure seamless steel pipe for chemical fertilizer equipment (GB6479-2000) is suitable for the working temperature of -40~ 400℃, the working pressure of 10~30Ma chemical equipment and pipes of high quality carbon structural steel and alloy steel seamless steel pipe.

6. Seamless steel tube for petroleum cracking (GB9948-88) is suitable for furnace tube, heat exchanger and pipeline seamless steel tube for petroleum refinery.

7. Steel pipe for geological drilling (YB235-70) is used for core drilling by geological department, which can be divided into drill pipe, drill collar, core pipe, casing pipe and precipitation pipe according to its use.

8. Seamless steel pipe for diamond core drilling (GB3423-82) is used for diamond core drilling drill pipe, core rod, casing seamless steel pipe.

9. Oil drilling pipe (YB528-65) is a seamless steel pipe used for both ends of oil drilling thickening inside or outside. Steel pipe can be divided into two kinds: turning wire and non-turning wire. Turning wire pipe is connected with joint, and non-turning wire pipe is connected with tool joint by butt welding method.

10. Seamless carbon steel steel pipe for ships (GB5213-85) is a seamless carbon steel pipe used in the manufacture of class I pressure pipe system, class II pressure pipe system, boiler and superheater. The working temperature of seamless carbon steel pipe wall shall not exceed 450℃, and that of seamless alloy steel pipe wall shall exceed 450℃.

11. Seamless steel pipe for automobile axle sleeve pipe (GB3088-82) is hot rolled seamless steel pipe of high quality carbon structural steel and alloy structural steel for automobile axle sleeve pipe and axle housing pipe of drive axle.

12. High pressure tubing for diesel engine (GB3093-2002) is a seamless cold drawn steel tube for high pressure pipe of diesel engine injection system.

13. Seamless steel tubes with precision inner diameter for hydraulic and pneumatic cylinders (GB8713-88) are cold-drawn or cold-rolled precision seamless steel tubes with precision inner diameter for hydraulic and pneumatic cylinders.

14. Cold drawn or cold rolled precision seamless steel pipe (GB3639-2000) is used for mechanical structure, hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision seamless steel pipe manufacturing machinery structure or hydraulic equipment, can greatly save machining hours, improve material utilization rate, and improve product quality.

15. Stainless steel seamless steel pipe for structure (GB/T14975-2002) is a hot-rolled (extruding, expanding) and cold-drawn (rolling) seamless steel pipe made of stainless steel, which is widely used in chemical, petroleum, textile, medical, food, machinery and other industries for corrosion resistant pipes and structural parts and parts.

16. Seamless stainless steel tubes for fluid transportation (GB/T14976-2002) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel tubes made of stainless steel for fluid transportation.

17. Special-shaped seamless steel pipe is the general term for seamless steel pipe with other cross section shapes except round pipe.

Generally The Difference Between

Welding square pipe is a hollow square section steel square pipe, also known as hollow cold formed steel. It is made of hot rolled or cold rolled strip steel or coil plate as blank by cold bending forming and then by high frequency welding made of square section shape and size of section steel.

In addition to the thickening of the wall, the corner size and edge flatness of the thick-walled square tube reach or even exceed the level of the resistance welding cold-formed square tube, and the size of the R Angle is generally between 2 and 3 times of the wall thickness. Also according to the needs of customers, we can produce the size of R Angle square pipe required by customers;

Square tube seamless square tube is a kind of hollow section, no joints around the strip of steel. It is a square tube formed by seamless tube extrusion through the 4 sides of the mould. The square tube has a hollow section and is widely used in liquid conveying, hydraulic support, mechanical structure, middle and low pressure. High pressure boiler pipe, heat exchange pipe, gas. Oil and other industries. It is stronger than welding, will not appear cracks.

Seamless Square Tube

Carbon steel seamless square tube is a kind of hollow square section light-weight thin-walled steel tube, also known as steel refrigeration bending section. It is a section steel with a square cross-section shape and size made of hot-rolled or cold-rolled strip or coil as the base material, cold bending, and then high-frequency welding. In addition to the thickening of the wall thickness of the hot-rolled extra-thick-walled square tube, its corner size and edge straightness have reached or even exceeded the level of the resistance-welded cold-formed square tube.


Product Name  Carbon Steel Seamless Pipe
Material A53(A.B)A106 (A. B).0345,16Mn, 10#, 20#,45# S235JR. S355JR, Q320,Q360,Q410,Q460,Q490 ASTMA252, Gr.2,Gr.3.ST37, ST42, ST52, GrB, X42 X46 X52 X5 X6 X65 X70. 30CrMo  .etc
Wall Thickness 2.5-75mm
Outer Diameter 13.7-1219.2mm
Length Length:Single random length/Double random length
5m-14m,5.8m,6m,10m-12m,12m or as customer's actual reques
Standard API 5L, ASTM A53-2007, ASTM A671-2006, ASTM A252-1998, ASTM A450-1996, ASME B36.10M-2004, ASTM A523-1996, BS 1387, BS EN10296, BS  ANSI B36.1
6323, BS 6363, BS EN10219, GB/T 3091-2001, GB/T 13793-1992, GB/T9711
Section Shape Square, Rectangular, Round,
Pipe Ends Plain end/Beveled,protected by plastic caps on both ends, cut quare,grooved,threaded and coupling,etc.
Surface Treatment 1. Galvanized,bare
2. PVC,Black and color painting
3. Transparent oil,anti-rust oil
4. According to clients requirement

Regular Size



20x20 / 25x25

1.2MM --2.75MM

30x30 / 20x40 / 30x40 / 25x40

1.2MM -- 3.5MM

40x40 / 50x50 
30x50 / 25x50 / 30x60 / 40x60

1.2MM -- 4.75 MM

60x60 / 50x70 / 40x80 / 40x50

1.2 MM -- 5.75 MM

70x70 / 60x80 / 50x80 / 100x40 / 50x90

1.5MM -- 5.75 MM

75x75 / 80x80 / 90x90 
60x100 / 50x100 / 120x60 / 100x80 / 60x90

1.5MM -- 7.75 MM

100x100 / 120x80

1.8MM -- 7.75 MM

120x120 / 130x130 
180x80 / 160x80 / 100x150 / 140x80 / 140x60

2.5MM -- 10.0 MM

140x140 / 150x150 / 100x180 / 200x100

2.5MM -- 10.0 MM

160x160 / 180x180 / 200x150

3.5MM -- 11.0 MM

200x200 / 250x150 / 100x250

3.5MM -- 11.0 MM

250x250 / 250x200 / 300x150 / 300x200

4.5MM -- 15.0 MM

300x300 / 350x200 / 350x250 /300x150

4.5MM -- 15.0 MM

350x300 / 450x250 / 400x300 / 500x200

4.5MM -- 15.75 MM

400x400 / 280x280 
450x300 / 450x200 / 400x350 / 400x250 / 500x250 / 500x300

4.5MM -- 15.75 MM

Seamless Pipes Are Divided Into

1.High pressure chemical fertilizer pipe : 10 20 16Mn GB6479-2000 ∮8-1240*1-200 Is suitable for chemical equipment and pipelines with working temperature of -40-400 ºC and working pressure of 10-32mpa

2.Conveying fluid pipe: 10#, 20#ASTM A106A,B,C, A53A,B16Mn& Lt; Q345A. B.C.D.E & gt; GB/T8163-2008 ASTM A106ASTM A53 ∮8-1240*1-200 Suitable for conveying fluid general seamless steel pipe

3.General structure tube: 10#, 20#, 45#, 27SiMnASTM A53A,B16Mn< Q345A, B, C, D, E> GB/T8162-2008 GB/T17396-2009ASTM A53 ∮8-1240*1-200 suitable for general structure, engineering support, mechanical processing, etc

4. Oil Tubing: J55, K55, N80, L80C90, C95, P110 API SPEC 5CTISO11960 ∮60.23-508.00*4.24-16.13 Tubing is used to extract oil or natural gas from oil Wells as well walls

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