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Longitudinally welded pipe,Structure Longitudinal steel Pipe

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 Longitudinally welded pipe 

Longitudinal welded steel pipe 
Custom Longitudinal steel pipe 
Large Diameter Longitudinal Welded Pipe 
Structure Custom Longitudinal steel Pipe 

With more than 15 years' of welded steel pipe production experience and participation in government projects, we fullly comprehend the materials, production processing, testing control, therefore, our products fully comply with API, ASTM, GRA/GRB, BS1378-1985, DIN 2391 standard etc. 

What we offering to you: 
Longitudinal Girth Welded Steel Pipes: 
The pipes with outside diameter from 508mm(20inch) to 3556mm(140inch), maximum length from 1500mm(59.055inch)up to 3000mm(118.110inch) 
The pipes with wall thickness diameter from 7mm(0.276inch) up to 40mm(1.575inch) 
Longitudinal Straight seam welded steel pipe: 
The pipes with outside diameter from 508mm(20inch) to 2032mm(80inch), maximum length from 6000mm(236.220inch) 
The pipes with wall thickness diameter from 7mm(0.276inch) up to 22mm(0.866inch) 
Longitudial Welded Steel Pipe By Customized: 
The pipes with outside diameter from 300mm(11.811inch) to 3500mm(137.795inch), maximum length from 800mm(31.496inch)up to 1500mm(59.055inch) 
The pipes with wall thickness diameter from 20mm(0.787inch) up to 80mm(3.150inch) 

Our Advantage: 
*Reliable products 
*Competitive price 
*Flexible business cooperation 
*ISO Certified processing 
*100%tested products 
*Earth-friendly products 
*OEM Acceptable 
*Small order available 
*Professional service 
*Cost saving shipment. 

Welded steel pipe: 
Welded steel pipe is steel plate with the bending deformation of round, square and other shapes and then welded into the surface of the pipe joints. Welded steel pipe used is steel or steel billets. We supply of welded steel pipe manufactiong process is simple, high production efficiency, many varieties of different specificatios, equipment, less captial, but the general strength less than seamless. 
Since the 20th century, 30 years, with high-quality steel rolling prodiction, as well as the rapid development of welding and inspection technology advances, continually raising the quality weld, welding steel pipe increasing number of varieties and specifications, and in a growing number of areas instead of non-Steel Pipe, than the seamless steel pipe welded steel pipe and low cost, high production efficiency. 
We will strictly test and check our products, such as steel surface quality should be smooth, not permit folding, cracks, delamination, take the existence of welding defects. Allowed no more than pipe wall thickness of the surface of a negative bias is zoned Road, scratches, weld dislocation, burns and other minor flaw. Allow welds and inner wall thickening seam welding bars there. 
Welded steel pipe should be done mechanical performance test and flattening test as well ad the flared test, and to meet the standard requirements. Pipe should be able to withstand a certain degree of intemal pressure, when necessary, 2.5Mpa pressure test and maintain for one minute without leakage, permits the use of eddy current testing in lieu in of hydrostaitic testing. Eddy current testing according to GB7735 "steel tube eddy current test method "standard. Eddy current method is to probe the rack, the flaw with the weld to keep 3~5mm distance, by the rapid movement of the weld pipe to conduct a comprehensive scanning, eddy current flaw detection signal by the automatic processing and automatic sorting, achieve the detection purpose. 
After testing with flying saw pipe length required to cut off, after turning off the assembly line aircraft. Pipe ends shall be flat head chamfering, print mark, finished tied packed hexagonal tubes factory. 
Please consult us for any project or requirements.

OD Wall Thickness/mm
/mm 0.5 0.6 0.8 1 1.2 1.4 1.5 1.6 1.8 2 2.2 2.5 2.8 3 3.2
  Weight/(kg/m)
5 0.055 0.065 0.083 0.099                      
8 0.092 0.109 0.142 0.173 0.201                    
10 0.117 0.139 0.181 0.222 0.26                    
12 0.142 0.169 0.221 0.271 0.32 0.366 0.388 0.41              
13   0.183 0.241 0.296 0.343 0.4 0.425 0.45              
14   0.198 0.26 0.321 0.379 0.435 0.462 0.489              
15   0.123 0.28 0.345 0.408 0.47 0.499 0.529              
16   0.228 0.3 0.37 0.438 0.504 0.536 0.568              
17   0.243 0.32 0.395 0.468 0.359 0.573 0.608              
18   0.257 0.339 0.419 0.497 0.573 0.61 0.647              
19   0.272 0.359 0, 444 0.527 0.608 0.647 0.687              
20   0.287 0.379 0.469 0.556 0.642 0.684 0.726 0.808 0.888          
21     0.399 0.493 0.586 0.677 0.721 0.765 0.852 0.937          
22     0.418 0.518 0.616 0.7U 0.758 0.805 0.897 0.986 1.074        
25     0.477 0.592 0.704 0.815 0.869 0.923 1.03 1.134 1.237 1.387      
28     0.537 0.666 0.793 0.918 0.98 1.0412 1.163 1.282 1.4 1.572 1.74    
30     0.576 0.715 0.852 0.987 1.054 1.121 1.252 1.381 1.508 1.695 1.878 1.997  
32       0.764 0.911 1.065 1.128 1.199 1.341 1.48 1.617 1.1819 2.016 2.145  
34       0.814 0.971 1.125 1.202 1.278 1.429 1.578 1.725 1.942 2.154 2.293  
37       0.888 1.059 1.229 1.313 1.397 1.562 1.726 1.888 2.127 2.361 2.515  
 
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Our company covers an area of 80, 000 m2 with a total assets of 90 million Yuan. There are 360 staff members including 80 technicians in our company. .

We also establish an effective complete quality control system. In 2003, our company obtained the certificate of ISO9001 Quality System Authentification!