SSAW Steel Pipe
Manufacturing Technique of Double Submerged Arc Spiral Steel Pipe:
1. Strip steel, welding wire and welding flux are the raw materials which are passed a strict physical and chemical inspection before using.
2. By using single or double submerged-arc welding, and with a butt joint between the head and trail in each strip steels, the welded pipe taking an automatic submerged repairing welding.
3. Before the molding, we should flattened the strip steel, cut the edge, shave the edge, transport the cleaning surface and deal with the bending edge.
4.To make sure the steady transport, we adopt the electro connecting pressure gauge to control the pressure of the oil-cylinder which is under the conveyor.
5.The internal and external roller molding is adopted.
6. We use the weld joint space control device to guarantee the weld joint space. The pipe diameter, the unfitness of butt joint and the weld joint space are all controlled strictly.
7. The internal and external welds are all applied the American Lincoln electric welding machine. By conducting the single or double submerged-arc welding, we can achieve the steady welding norm.
8. In order to make sure the 100% nondestructive testing coverage of spiral weld joint, it will be inspected by the online automatic ultrasonic instrument in a row. Thanks to the inspection, the productive worker will adjust the technological parameter timely if there is any defectiveness.
9. SSAW steel pipe is cut into single steel pipe by using the air plasma cutting machine.
10. Each double submerged arc spiral steel pipeshould be inspected strictly after being cut into single. By examining the mechanical property, chemical constitution, salvation condition, surface quality and nondestructive inspection, we can assure the eligibility of the process before the formal production.
11. The marked part on the weld joint which is found by the successive sonic flaw detection should be reexamined by the manually operated ultrasonic and X-ray. The defective one should be repaired and go thorough the nondestructive test until the defect is .removed.
12. The pipes of T-shaped joint between strip steel butt welded seam and spiral weld joint are all examined by the X-ray television or the screening.
13. Applying the radial seal, each steel pipe should accept the hydrostatic pressure test. The test pressure and duration are all strictly controlled by the detecting device of the hydraulic pressure. And the experiment parameter is printed records automatically.
14. By carrying out the machining operation of the pipe end, we control the verticality of the end face, the angle of the groove, and the truncated edge accurately.
SSAW steel pipe (double submerged arc spiral steel pipe) is mainly used for tap water project, petrochemical industry, chemical industry, power industry, farming irrigation, urban construction. With liquid transport, it can be used in water supply, water drainage, the project of sewage treatment, soil transportation, and ocean water transport. With gas delivery, it can be applied in the gas, steam, and liquefied petroleum gas. For structural use, it can be applied in piling driving, bridge construction, wharf, road, building structure, marine piling, etc.
Main Component of SSAW Steel Pipe:
The raw material is strip steel. By using single or double submerged-arc welding, and with a butt joint between the head and trail in each strip steels, the welded pipe taking an automatic submerged repairing welding.
Feature of SSAW Steel Pipe:
With strong loading capacity, good plastic property, and easy to be welded and shaping, the double submerged arc spiral steel pipe of pressure-bearing fluid transportation is mainly applied in the transport of petroleum and natural gas.
1.The SSAW steel pipe is applied in accordance with the customer's specific circumstances. 2.For fear of rusting in the long time ocean shipping, the steel pipes are all sprayed anticorrosive paint before exporting.
Executive Standard: SY/T5037-2000;GB/T9711;API-5L,ASTM A 53
Material: Q235,Q345,X42-65,L175-L555Technical Parameters of Double Submerged Arc Spiral Steel Pipe:
|specifications||Wall thickness||specifications||Wall thickness|
|Standard||SY/T5037-2000 GB9711.1 GB9711.2 API5L|
|Standard||ASTM A252 ,API 5L ,GB/T 9711,DIN10208|
|Usage||ERW STEEL PIPE LINE FOR OIL, GAS, COAL AND MINE TRANSMISSION|
|Ends||Beveled, flange, Plain, beveled/straight cut, plastic or mental ends protectors|
|Surface||Bared, or Black painting, 3PE, FBE|
|Technical||SAW, ERW, SSAW|
|Payment||L/C, T/T, ETC|
|Delivery||10--30 days after receiving the deposit or the LC|
|FOB Port||ANY PORT IN CHINA,TIANJIN IS BETTER|
2. Packed by steel strip into bundle
3. According to client
|Inspection||With hydraulic testing, eddy current, infrared test|
|Place of export||Europe, North America, the Middle East, Africa, Asia and other countries|
|Coating||black painting, vanish, 1PE/3PE/FBE|
Packing and Shipping:
All the straight seam steel is wrapped. The inland transportation mode is motor, while the overseas is sea transportation with containers.