What is Spiral steel pipe?
The application of spiral pipe in industry, also known as spiral steel pipe or spiral welded pipe, is to roll low carbon structural steel and low alloy steel strip into steel pipe according to certain spiral angle, and then weld into pipe joint.
spiral steel pipe
Advantages of Spiral steel pipes
First, spiral welded pipes have higher strength than straight welded pipes.
Second, according to the tests of relevant research institutions in the United States, although the spiral welded pipe and the straight welded pipe (ERW steel pipe) are at the same level, the spiral welded pipe has high impact toughness.
Third, the spiral pipe tube has high fatigue strength as well as the seamless steel tube’s and the electric resistance welded steel tube’s.
Fourth, the dimensions are accurate, the diameter tolerance is less than 0.12%, the deflection is less than 1/2000, and the ellipse is less than 1%.
Fifth, under the same pressure conditions, the stress of the spiral weld is lower than that of the straight weld, which is 75% to 90% of the stress of the straight seam welded pipe, and can withstand higher pressure.
Spiral tube production equipment
Usage of Spiral steel pipe
For the use of spiral welded pipe, the first welding method is an important reference, such as arc welded pipe, high frequency or low frequency resistance welded pipe, gas welded pipe, furnace welded pipe or Bondi pipe. Often spiral steel pipes are used in:
Liquid transportation: water supply, drainage, oil transportation, etc.
Gas transmission: gas, steam, LPG, gas, etc.
Structure: pile, bridge, wharf, road, building structure, etc.
Internal display of spiral tube
Specification of Spiral steel pipes
For wide range of spiral pipes’ specification and substrate standards, It could be referred below,
Q235A, Q235B, 10#, 20#, Q345(16Mn);
L245(B), L290(X42), L320(X46), L360(X52), L390(X56);
L415(X60), L450(X65), L485(X70), L555(X80);
L290NB/MB (X42N/M), L360NB/MB (X52N/M), L390NB/MB (X56N/M), 415NB/MB (X60N/M);
L450MB(X65), L485MB(X70), L555MB(X80).
SSAW pipes with diameter: 21 9mm to 2200 mm,
SSAW pipes wall thickness: since 6 mm to 25 mm.