Cut 3PE anticorrosive steel pipe_ Specification of spiral pipe_ Long service life

  Shengshida Steel Co
, Ltd http://www
ssdsteel
com Our main products are spiral pipes, plastic coated spiral steel pipes, seamless pipes, etc
welcome new and old customers to visit and cooperate
Shengshida spiral steel pipe has strong pressure bearing capacity and good plasticity, which is convenient for welding and processing
It is made of double-sided automatic submerged arc welding or single-sided welding
It is used for straight seam and spiral submerged arc welding steel pipes for water, air, heating steam and other ordinary fluid transportation

 
Performance characteristics of shengshida spiral steel pipe:
Spiral pipe has the advantages of simple production process, high production efficiency, low cost and rapid development
The strength of spiral welded pipe is generally higher than that of straight seam welded pipe
It can produce welded pipe with larger pipe diameter with narrow blank, and it can also produce welded pipe with different pipe diameters with blank of the same width
However, compared with the straight seam pipe with the same length, the weld length increases and the production speed is lower

 
Shengshida spiral steel pipe uses:
Spiral steel pipes are mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction, and are one of the 20 key products developed in China

Used for liquid transportation: water supply, drainage, sewage treatment engineering, mud transportation, ocean water transportation

For gas transmission: gas, steam, liquefied petroleum gas

For structure: as pile driving pipe and bridge; Pipes for wharves, roads, building structures, offshore piling pipes, etc

 
Shengshida spiral steel pipe welding process:
In terms of welding process, the welding method of spiral steel pipe is the same as that of straight seam steel pipe, but the straight seam steel pipe will inevitably have a lot of T-shaped welds, so the probability of welding defects is also greatly increased
Moreover, the welding residual stress at the T-shaped welds is large, and the weld metal is often in a three-dimensional stress state, increasing the possibility of cracks
Moreover, according to the process regulations of submerged arc welding, each weld should have an arc striking place and an arc extinguishing place, but each straight seam welded pipe cannot meet this condition when welding the circumferential seam, so there may be more welding defects at the arc extinguishing place

 
Shengshida spiral pipe weld treatment:
The spiral steel pipe sends the strip steel to the welded pipe unit
After rolling by multiple rollers, the strip steel is gradually rolled up to form a circular tube blank with opening gap
Adjust the reduction amount of the extrusion roller to control the weld gap at 1~3mm, and make both ends of the welded junction flush

1
If the gap is too large, the proximity effect will be reduced, the eddy current heat will be insufficient, and the weld intergranular joint will be poor, resulting in incomplete fusion or cracking

2
If the gap is too small, the proximity effect will increase, and the welding heat will be too large, resulting in weld burning; Or the weld is extruded and rolled to form deep pits, which will affect the surface quality of the weld

After heating the two edges of the tube blank to the welding temperature, under the extrusion of the extrusion roll, common metal grains penetrate and crystallize with each other to form a firm weld
If the extrusion pressure of spiral steel pipe is too small, the number of common crystals will be small, the strength of weld metal will decline, and cracking will occur after stress; If the extrusion force is too large, the molten metal will be extruded out of the weld, which will not only reduce the weld strength, but also produce a large number of internal and external burrs, and even cause defects such as weld overlap

 
After sales service of shengshida spiral steel pipe Merchants:
1
Exclusive business personnel continue to * follow up progress of customer goods;
2
The goods can be directly transported to the construction site;
3
If there is any loading and unloading problem of the product, professionals should give hand-in-hand guidance