The classification of the thick wall welded steel pipe

Thick wall welded steel pipe including straight seam welded steel pipe SAWL, spiral welded steel pipe SAWH, high-frequency welded steel pipe ERW, combination welding steel tube COW.

Thick wall welded steel tube usually refers to the thickness of the steel tube at 14 mm or more.

Straight seam welded steel pipe production SAWL thickness 8 mm - 80 mm;

Spiral welded steel pipe SAWH production thickness of 5.5 mm to 30 mm;

High frequency welded steel pipe ERW production thickness of 0.8 mm to 24 mm;

Above four kinds of steel pipe is used in the industry the most welded steel pipe, the similarities of these four products is: can perform low pressure fluid of GB/T3091-2008 steel pipe using standard, different welding style is different, the tube body vision, high standard, the use of different industry.

Thick wall steel pipe welding different styles:

SAWL pipe body is only a weld (diameter > 914 allowed to have two), when the welding is used double-sided submerged arc welding, welding wire for welding filler.

SAWH is only a spiral weld, the welding when using double-sided submerged arc welding, welding wire for welding filler.

ERW pipe body is only a straight seam, adopting the principle of high frequency resistance welding, make the hot melt extrusion force plate end, no parent metal welding wire.

COW weld tube body style can be a straight seam, spiral seam, used when welding gas shielded welding and submerged arc welding, welding.

Steel tube body of thick wall visual difference:

SAWL for one or two straight weld, SAWH for spiral weld, ERW weld and weld without measure, COW gas protect welding seam is not completely covered by submerged arc welding seam.

Thick wall steel tube high standards of different:

SAWL high standard execution, GB/T9711.1-1997, GB/T9711.2-1997, API 5 l.

SAWH high standard execution, GB/T9711.1-1997, GB/T9711.2-1997, GB/T5037.

Thick wall welded steel pipe industry of use:

SAWL thick wall steel pipe straight seam wide used in heavy steel structure, bridge pile, bridge structure, long distance oil and gas.

SAWH spiral thick wall steel pipe used in low pressure fluid more water pipes, high pressure natural gas long distance pipeline.

High frequency ERW welded steel pipe used in various industries, more restricted conditions for high frequency welding steel pipe wall thickness can only biggest production to 24 mm.

Worldwide application of resistance welding steel pipe steel pipe industry account for 60% of the steel pipe products,

Thick wall steel pipe is often used in processing and high frequency thermal expansion of steel tube, square moment of steel tube of raw materials.